Search Results — 2000 specimen records retrieved (1739 records with coordinates)
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Results for search: Collector=Roos;   

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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/cch_archive/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  CLARK-A1528-3544  Abies concolor John C. Roos, Alfred R. Roos 1950-8-6 4911 San Bernardino Kingston Range 2133 Comment
  UCR25761  Abronia villosa John C. Roos 1937-4-25 770 San Bernardino Southeastern Mojave Desert, Chambless, near [east of] Amboy [on old Route 66] Comment
  RSA0023454  Acacia farnesiana subsp. minuta J. C. Roos 1937-8-30 2560 San Diego South of Otay. Comment
  CLARK-A1528-2720  Acacia greggii John C. Roos 1950-8-4 San Bernardino Clark Mountain Range Comment
  CLARK-A1528-2686  Acalypha californica John C. Roos 1937-8-30 2565 San Diego Jamul Comment
  RSA44244  Acamptopappus shockleyi J. C. Roos 1949-5-29 3533 San Bernardino N base of Clark Mtns. 1341 Comment
  UC1080601  Acamptopappus shockleyi John C. Roos 1955-5-13 6345 Inyo e, in sand dunes, at w base of Last Chance Mts Eureka Valley; Last Chance Mts. 1280 Comment
  RSA92296  Acamptopappus shockleyi J. C. Roos, L. Roos 1954-5-8 6098 Inyo Grapevine Mountains above Leadfield 1584 Comment
  CLARK-A1528-4977  Acer glabrum John C. Roos 1947-7-14 2849 Inyo Panamint Mountains Comment
  RSA85653  Acer glabrum subsp. diffusum J. C. Roos, A. R. Roos 1950-8-6 4915 San Bernardino Kingston Peak, Kingston Mountains., Eastern Mojave Desert. 2165 Comment
  UCSB45949  Achillea millefolium Roos, John 1965-6-12 San Bernardino Igos, near Mountain Home Village in Mills Canyon, San Bernardino Mtns. Comment
  CAS-BOT-BC216439  Achnatherum aridum J. C. Roos; A. R. Roos 1950-8-5 4894 San Bernardino 1.5 miles SW of Coliseum Mine, Clark Mountains, Mojave Desert 1737 Comment
  GH361382  Achnatherum aridum J. C. Roos 1955-5-13 6346 Unknown west base Last Chance Mts., east of the Eureka Valley sand dunes. 1280 Comment
  CAS-BOT-BC210581  Achnatherum coronatum J. C. Roos 1965-6-6 s.n. San Bernardino Mill Creek near Fallsvale, San Bernardino Comment
  CAS-BOT-BC260479  Achnatherum hymenoides J. C. Roos 1965-6-7 s.n. San Bernardino Victorville Comment
  CAS-BOT-BC260414  Achnatherum hymenoides J. C. Roos; A. R. Roos 1953-8-13 6013 Mono Crest of Inyo Mountains, 3 miles E of Badger Flat 3169 Comment
  SEINET13387085 Image available Achnatherum hymenoides J. C. Roos 1965-1 San Bernardino Victorville, Mohave Desert Comment
  UCSB37778  Achnatherum lemmonii Roos, John 1965-7-17 San Bernardino Stetson Creek, Barton Flats, San Bernardino Mtns. Comment
  UCSB37783  Achnatherum occidentale subsp. californicum Roos, John 1981-09 San Bernardino Barton Flats, San Bernardino Mtns. Comment
  RSA155762  Achnatherum occidentale subsp. occidentale J. C. Roos, A. R. Roos 1955-8-26 6556 Inyo N shoulder Waucoba Mts, Inyo Mts 3354 Comment
  RSA40606  Achnatherum occidentale subsp. occidentale J. C. Roos 1946-9-4 2960 San Bernardino In gravel among rocks, San Gorgonio Ridge, San Bernardino Mts 3415 Comment
  RSA40612  Achnatherum occidentale subsp. occidentale J. C. Roos 1946-9-15 3032 San Bernardino Rocky moraine above Dry Lake, San Bernardino Mts. 2957 Comment
  RSA648083  Achnatherum occidentale subsp. occidentale J. C. Roos 1937-7-18 398 Los Angeles Mt. Wilson Observatory. Comment
  UCSB37784  Achnatherum occidentale subsp. occidentale Roos, John 1965-7-18 San Bernardino Bear Valley, San Bernardino Mtns. Comment
  CAS-BOT-BC218077  Achnatherum pinetorum J. C. Roos; A. R. Roos 1954-6-12 6132 Inyo Ridge between Wild Rose and Trail Canyons, 1 mile ESE of Wild Rose Peak, Panamint Mountains 2499 Comment
  CAS-BOT-BC218080  Achnatherum pinetorum J. C. Roos 1955-7-21 6480 Inyo Summit, Whitetop Peak, Last Chance Mountains 2499 Comment
  CAS-BOT-BC218000  Achnatherum webberi John Roos; Lucille Roos 1952-7-25 5819 Inyo Between Westgard Pass and Reed Flat, White Mountains 2438 Comment
  UCSB42196  Acmispon nevadensis var. davidsonii Roos, John 1965-6-26 San Bernardino Upper Santa Ana River, San Bernardino Mtns. Comment
  POM302518  Acourtia microcephala J. C. Roos 1943-7-15 2734 San Bernardino San Timoteo Canyon, south of Redlands Comment
  UCR30527  Adenostoma fasciculatum John C. Roos 1952-5-26 5722 Riverside Haas' Ranch, Reche Canyon 457 Comment
  CLARK-A1528-3972  Adenostoma sparsifolium John C. Roos 1965-8-18 Riverside San Jacinto Mountains Comment
  UCR18788  Adiantum aleuticum John C. Roos 1949-7-2 4529 San Bernardino San Bernardino Mountains, Snow Canyon [Rattlesnake Creek], Mill Creek 2104 Comment
  CAS-BOT-BC69629  Adiantum capillus-veneris J. C. Roos 1955-7-23 6512 Inyo Mouth of Beveridge Canyon, e. base Inyo Mts., Saline Valley. 609 Comment
  UCR18785  Adiantum capillus-veneris John C. Roos 1948-5-15 3850 Riverside Sonoran (Colorado) Desert, Eagle Mountains, upper Lost Palms Canyon 1037 Comment
  UCR23356  Adiantum capillus-veneris John C. Roos 1955-7-23 6512 Inyo Inyo Mountains, mouth of Beveridge Canyon, east base of mountains, Saline Valley 610 Comment
  CLARK-A1528-3539  Adiantum jordanii John C. Roos 1952-2-29 5363 Riverside Reche Canyon 457 Comment
  CLARK-A1528-3578  Adiantum pedatum John C. Roos 1948-5-29 3871 Riverside Whitewater Canyon Comment
  CLARK-A1528-3579  Adiantum pedatum subsp. aleuticum John C. Roos 1937-3-27 1330 Santa Barbara Solvang Comment
  UCR19131  Agastache urticifolia John C. Roos 1946-8-31 2990 San Bernardino San Bernardino Mtns., Oak Glen, irrigation ditch behind Oak Glen School 1433 Comment
  CAS-BOT-BC35126  Ageratina herbacea John C. Roos 1950-9-2 4969 San Bernardino Clark Mountains, 1.5 miles south of Colisum Mine, eastern Mohave Desert 1706 Comment
  CLARK-A1528-1618  Ageratina herbacea John C. Roos 1950-9-2 4969 San Bernardino Clark Mountain 1706 Comment
  RSA662530  Ageratina occidentalis J. C. Roos 1948-9-7 3999 Tuolumne Tioga Pass, Sierra Nevada Mtns. 2744 Comment
  UCR30495  Agoseris glauca John C. Roos, A. R. Roos 1953-8-11 6003 Inyo Northern Mojave/Great Basin Desert, north slope of the Inyo Mtns: 3 mi east of Blue Bell Mine on the trail to Side Hill Spring 3110 Comment
  POM266382  Agoseris heterophylla var. heterophylla J. C. Roos 1937-3-17 2458 Los Angeles San Fernando Valley. Comment
  POM263462  Agrostis idahoensis J. C. Roos 1937-8-8 424 Inyo Lone Pine Canyon. 2744 Comment
  RSA263175  Agrostis idahoensis J. C. Roos 1937-8-18 465 Riverside Round Valley, San Jacinto Mountains. Comment
  UCSB40901  Agrostis pallens Roos, John 1939-6-8 Los Angeles Canyon in hills N of Burbank Comment
  UCR23918  Agrostis scabra John C. Roos 1940-8-3 1555 San Bernardino San Bernardino Mtns., Bluff Lake 2317 Comment
  OBI40201  Agrostis stolonifera John C. Roos 1950-9-16 4988 Los Angeles Santa Monica Blvd & Midvale Ave, Los Angeles 61 Comment
  UCR25414  Agrostis stolonifera John C. Roos 1949-11-16 4695 San Bernardino San Bernardino Valley, Loma Linda, N Anderson Street 323 Comment
  UCR24051  Agrostis viridis John C. Roos 1950-7-5 4849 San Bernardino San Bernardino Valley, Loma Linda, residence at 414 Steward Street 335 Comment
  UCR30616  Agrostis viridis John C. Roos, A. R. Roos 1950-8-7 s.n. San Bernardino Northeastern Mojave Desert, Beck Spring, Kingston Mountains 1372 Comment
  CLARK-A1528-4082  Ailanthus altissima Alfred R. Roos 1949-7-21 Los Angeles Los Angeles Comment
  UCR26197  Ailanthus altissima John C. Roos 1937-6-8 937 San Diego Peninsular Range, Warner Hot Springs Comment
  RSA44250  Aliciella triodon J. C. Roos 1949-5-28 3541 San Bernardino North slope of Clark Mt. 1585 Comment
  UCR25789  Allenrolfea occidentalis John C. Roos 1937-8-6 972 Inyo Sierra Nevada Mtns, Bishop 1250 Comment
  CLARK-A1528-3262  Allionia incarnata John C. Roos 1937-4-25 2103 San Bernardino Essex Comment
  UC1010302  Allionia incarnata John C. Roos 1950-9-1 4952 San Bernardino eastern Mohave Desert, Valley Wells Valley Wells; eastern Mohave Desert, Valley Wells 1127 Comment
  CLARK-A1528-1506  Allium fimbriatum John C. Roos 1950-6-24 4840 San Bernardino Bear Valley 2224 Comment
  POM263555  Allium fimbriatum var. fimbriatum J. C. Roos 1941-5-10 129 Riverside Pinyon Flats Camp, Santa Rosa Mountains. 1220 Comment
  UCR27415  Allium haematochiton John C. Roos 1950-3-18 4714 Riverside Peninsular Range, 3 - 4 mi north of Murrietta in the hills 457 Comment
  UCR18565  Allium lacunosum var. davisiae John C. Roos 1967-5-20 s.n. San Bernardino San Bernardino Mtns., Deep Creek Comment
  UCR18571  Allium nevadense var. cristatum John C. Roos 1949-5-29 4369 San Bernardino Eastern Mojave Desert, Coloseum Mine, Clark Mountain 1707 Comment
  UCR26247A  Allium nevadense var. cristatum John C. Roos 1949-6-27 4511 San Bernardino Eastern Mojave Desert, steep north side of the Kingston Mtns. 2104 Comment
  RSA648735  Allium peninsulare J. C. Roos 1948-5-22 3865 San Bernardino In a canyon S.E. of the summit of Reche Canyon. Comment
  UCR18569  Allium praecox John C. Roos 1950-3-27 4718 San Bernardino San Bernardino Valley, steep north slope of Slover Mtn. 351 Comment
  UCR24324  Allophyllum divaricatum John C. Roos 1965-1-12 s.n. San Bernardino San Bernardino Mtns., Mill Creek Comment
  UCR30820  Allophyllum glutinosum John C. Roos 1949-7-30 4597 San Diego Peninsular Range, hills north of Pala 122 Comment
  CLARK-A1528-2276  Alnus rhombifolia John C. Roos 1965-9-11 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-5243  Alnus rhombifolia var. bernardina John C. Roos 1936-8-15 570 San Bernardino San Bernardino Mountains 1981 Comment
  UCR25146  Amaranthus albus John C. Roos 1965-7-4 s.n. San Bernardino San Bernardino Valley, Loma Linda 306 Comment
  CLARK-A1528-1393  Amaranthus californicus John C. Roos 1937-8-19 2020 Riverside San Jacinto Mountains Comment
  CLARK-A1528-1394  Amaranthus deflexus John C. Roos 1954-10-19 6255 San Diego Escondido 198 Comment
  CLARK-A1528-1402  Amaranthus hybridus John C. Roos 1954-11-21 6257 San Bernardino Loma Linda 335 Comment
  CLARK-A1528-2402  Amaranthus hybridus John C. Roos 1951-9-19 5222 San Bernardino Loma Linda 335 Comment
  CLARK-A1528-5149  Amaranthus hybridus John C. Roos 1954-11-21 6257 San Bernardino Loma Linda 335 Comment
  RSA662075  Amaranthus hybridus A. R. Roos 1937-12-2 s.n. San Diego De Luz Canyon: Along De Luz-Murrieta Road and De Luz Creek. 150 Comment
  UCR23418  Amaranthus hybridus John C. Roos 1938-8-19 2753 San Bernardino San Bernardino Valley, Loma Linda 305 Comment
  UCR23421  Amaranthus hybridus John C. Roos 1965-10-13 s.n. Riverside Corona Comment
  RSA0036246  Amaranthus hybridus A. R. Roos 1937-12-2 s.n. Orange Santa Ana. Comment
  CLARK-A1528-1406  Amaranthus retroflexus Alfred R. Roos 1937-11-24 San Bernardino Bryn Mawr Comment
  UCD97777  Amaranthus retroflexus A. R. Roos 1937-11-24 s.n. San Bernardino Bryn Mawr. Comment
  UCSB41538  Amaranthus retroflexus Roos, Alfred 1937-11-24 San Bernardino Bryn Mawr Comment
  CLARK-A1528-1533  Ambrosia acanthicarpa John C. Roos 1965-9-26 Riverside San Jacinto Mountains Comment
  CLARK-A1528-1534  Ambrosia chenopodiifolia John C. Roos 1937-6-13 1441 San Diego San Ysidro Comment
  POM266301  Ambrosia chenopodiifolia J. C. Roos 1937-6-13 1441 San Diego hillside near San Ysidro Comment
  CLARK-A1528-1103  Ambrosia confertiflora John C. Roos 1943-4-10 2613 San Bernardino Loma Linda 365 Comment
  UCR24359  Ambrosia psilostachya John C. Roos 1938-8-19 2750 San Bernardino San Bernardino Valley, Loma Linda 305 Comment
  UCR27935  Amelanchier covillei John C. Roos 1948-7-4 3914 Inyo Panamint Mtns., Thorndike's Spring 2165 Comment
  CLARK-A1528-3212  Ammannia coccinea John C. Roos 1952-5-16 5672 Riverside San Jacinto River 426 Comment
  POM265818  Ammannia coccinea J. C. Roos 1937-6-14 926 San Diego La Mesa Comment
  UCR23953  Amorpha californica John C. Roos 1952-6-13 5767 Riverside Pass between Reche Canyon and the north base of Pigeon Pass. 488 Comment
  RSA450474  Amorpha fruticosa J. C. Roos 1965-9-28 s.n Riverside San Jacinto Valley, near Gilman Hot Springs in dry canyon bottom. Comment
  RSA92575  Amsinckia tessellata J. C. Roos, L. Roos 1952-5-10 5627 San Bernardino Kremer Hills {Kramer Hills} 854 Comment
  RSA92576  Amsinckia tessellata J. C. Roos, L. Roos 1952-5-10 5646 San Bernardino Adelanto 915 Comment
  CLARK-A1528-1482  Amsonia brevifolia John C. Roos 1937-4-25 2120 San Bernardino Providence Mountains Comment
  UCR23415  Amsonia tomentosa John C. Roos, P. A. Munz 1955-4-8 6311 Inyo Northern Mojave Desert, Last Chance Mtns, east of Eureka Valley sand dunes 1220 Comment
  UC1026576  Ancistrocarphus filagineus John and Lucille Roos 1954-5-11 6118 Riverside Reche Canyon 609 Comment
  CLARK-A1528-4455  Andropogon glomeratus John C. Roos 1938-11-5 San Bernardino San Bernardino Mountains Comment
  UCR23841  Andropogon glomeratus John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Furnace Creek, Death Valley -61 Comment
  UCR23921  Andropogon glomeratus John C. Roos 1938-12-29 322 Riverside San Jacinto Mtns/Colorado Desert, Palm Canyon Comment
  UC1010324  Andropogon glomeratus var. pumilus John and Lucille Roos 1950-11-4 5023 San Bernardino s base San Bernardino Mts. Arrowhead Hot Springs; , Arrowhead Hot Springs 609 Comment
  CLARK-A1528-5584  Andropogon virginicus John C. Roos 1947-1-26 3204 Inyo Death Valley Comment
  CLARK-A1528-4073  Anemopsis californica John C. Roos 1947-4-20 3506 Inyo Furnace Creek 76 Comment
  CLARK-A1528-1548  Antennaria marginata John C. Roos 1947-6-27 3718 San Bernardino San Bernardino Mountains 2346 Comment
  CLARK-A1528-1549  Antennaria media John C. Roos 1941-8-27 37 San Bernardino San Bernardino Mountains 3352 Comment
  CLARK-A1528-1553  Antennaria rosea John C. Roos 1937-7-20 2375 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1554  Anthemis cotula John C. Roos 1965-6-29 San Bernardino Bryn Mawr 304 Comment
  RSA659725  Anthemis cotula J. C. Roos 1965-6-29 s.n. San Bernardino Bryn Mawr, 366 Comment
  CLARK-A1528-4161  Antirrhinum coulterianum subsp. orcuttianum John C. Roos 1937-5-10 2082 Orange San Juan Capistrano Comment
  RSA450070  Antirrhinum kelloggii J. C. Roos, A. C. Sanders 1956-4-8 6574 Ventura North slope of ''Bony Mountain'' [Boney Mountain]. Potrero Valley Comment
  CLARK-A1528-4167  Antirrhinum nuttallianum John C. Roos 1965-10-19 Riverside Reche Canyon Comment
  RSA85443  Antirrhinum nuttallianum subsp. nuttallianum J. C. Roos 1952-4-13 5517 Riverside Box Springs Mts., above Canyon Crest Heights. 457 Comment
  UCR30489  Antirrhinum nuttallianum subsp. nuttallianum John C. Roos 1949-7-30 4599 San Diego Peninsular Range, hills north of Pala 122 Comment
  UC1236266  Anulocaulis annulatus John C. Roos 1955-5-13 6350 Inyo n.e. Eureka Valley (w. base of Last Chance Mts.); Last Chance Mts. 1158 Comment
  SEINET13948784 Image available Aphyllon fasciculatum John C. Roos 1965-1 Inyo Arcane meadows, Near Telescope Peak, Panamint Mountains Comment
  UCR23397  Apiastrum angustifolium John C. Roos 1943-4-28 2629 Riverside hills SE of Riverside Comment
  CLARK-A1528-1426  Apium leptophyllum John C. Roos 1937-4-21 Los Angeles Claremont Comment
  CLARK-A1528-1474  Apocynum androsaemifolium John C. Roos 1937-7-27 2355 San Bernardino San Bernardino Mountains Comment
  RSA450127  Apocynum androsaemifolium subsp. pumilum J. C. Roos 1965-7-17 s.n. San Bernardino Stetson Creek, Barton Flats, San Bernardino Mountains. Comment
  CLARK-A1528-1478  Apocynum pumilum John C. Roos 1946-9-21 3053 San Bernardino San Bernardino Mountains 2042 Comment
  CLARK-A1528-1479  Apocynum pumilum John C. Roos 1965-7-17 San Bernardino San Bernardino Mountains Comment
  UCR26203  Aquilegia formosa John C. Roos 1948-7-4 3911 Inyo Panamint Mtns., Thorndike's Spring 2165 Comment
  CLARK-A1528-3847  Aquilegia shockleyi John C. Roos 1948-7-4 Inyo Panamint Mountains 2163 Comment
  RSA40588  Aquilegia shockleyi J. C. Roos 1947-7-12 2899 Inyo Thorndykes, Wildrose Canyon, Panamint Mounains. 2165 Comment
  CLARK-A1528-2283  Arabis glaucovalvula John C. Roos 1947-4-20 3515 Inyo Panamint Range 1554 Comment
  RSA0126443  Arabis hirsuta var. glabrata J. C. Roos 1947-6-27 3719 San Bernardino South Fork of Santa Ana River. San Bernardino Mts. 2409 Comment
  CLARK-A1528-2284  Arabis inyoensis John C. Roos 1937-8-8 2191 Inyo Lone Pine Canyon 2743 Comment
  UCR25409  Arabis pulchra John C. Roos 1949-4-30 4260 San Bernardino Mojave Desert, 6 mi. SW of Hesperia 1067 Comment
  RSA47340  Arabis repanda J. C. Roos 1949-7-16 4556 San Bernardino Moonridge, Bear Valley, San Bernardino Mts. 2256 Comment
  CLARK-A1528-1320  Arceuthobium divaricatum John C. Roos 1965-7-10 Inyo Mahogany Flats Comment
  UCR20380  Arceuthobium divaricatum John C. Roos 1949-9-2 4635 San Bernardino Eastern Mojave Desert, north slope of the Kingston Mountains 1982 Comment
  CAS-BOT-BC76268  Arctomecon merriamii John Roos; Lucille Roos 1954-5-8 6099 Inyo Grapevine Mountains above Leadfield. 1584 Comment
  RSA92295  Arctomecon merriamii J. C. Roos, Lucille Roos 1954-5-8 6099 Inyo Grapevine Mountains above Leadfield 1585 Comment
  UCR23643  Arctostaphylos andersonii John C. Roos 1940-6-13 1546 Monterey 3 or 4 mi east of Castroville. Comment
  POM302569  Arctostaphylos pungens J. C. Roos 1943-5-23 2652 San Bernardino Little San Bernardino Mountains. 1524 Comment
  CLARK-A1528-2438  Arenaria aculeata John C. Roos 1937-8-5 642 Inyo White Mountains 2743 Comment
Read comments
Jun 4 2015
  CLARK-A1528-2439  Arenaria aculeata John C. Roos, Lucille Roos 1951-8-8 5118 Inyo White Mountains 2956 Comment
  CLARK-A1528-2443  Arenaria kingii subsp. compacta John C. Roos 1949-6-21 3557 San Bernardino New York Mountains 2224 Comment
  CLARK-A1528-2444  Arenaria kingii subsp. compacta John C. Roos 1951-8-11 5179 Mono White Mountains 3474 Comment
  GH376602  Arenaria kingii subsp. compacta J. C. Roos & L. Roos 1951-8-10 5161 Unknown 1 mile north of Sheep Mtn., White Mts. 3596 Comment
  UCR18876  Arenaria kingii var. glabrescens John C. Roos, A. R. Roos 1953-8-11 5997 Inyo Northern Mojave Desert, Inyo Mtns: 2.5 mi east of Blue Bell Mine 2988 Comment
  CLARK-A1528-5148  Arenaria kingii var. glabrescens John C. Roos, Alfred R. Roos 1953-8-7 5930 Inyo Inyo Mountains 2743 Comment
  UCR23710  Arenaria macradenia John C. Roos 1943-5-23 2673 Riverside S Mojave Desert, Little San Bernardino Mtns 1524 Comment
  RSA47343  Argyrochosma jonesii J. C. Roos, L. Roos 1949-6-24 4475 San Bernardino north side of Clark Mtn. E. San Bernardino Co. 1676 Comment
  HSC78586  Arida carnosa J. C. Roos 1956-8-2 5691 San Bernardino N side of Hwy. 99, 0.2 miles West of Waterman Ave. Comment
  UCR24407  Arida carnosa John C. Roos 1946-9-21 3064 San Bernardino Mojave Desert, Rabbit Springs, Lucerne Valley 887 Comment
  RSA648674  Aristida adscensionis J. C. Roos 1946-10-26 3143 Riverside in the Chuckwalla Mtns., Colorado Desert. Comment
  UCR20454  Aristida adscensionis John C. Roos 1952-4-9 5508 Riverside Riverside, east face of Mt. Rubidoux 366 Comment
  UCR26316  Aristida adscensionis John C. Roos 1949-4-7 4176 Imperial Sonoran (Colorado) Desert, Lower Colorado River Valley, near Winterhaven 40 Comment
  CLARK-A1528-4465  Aristida californica John C. Roos 1937-8-22 1209 Riverside Mojave Desert Comment
  CLARK-A1528-4475  Aristida parishii John C. Roos 1940-2-17 891 Riverside Reche Canyon 457 Comment
  CLARK-A1528-4487  Aristida purpurea John C. Roos 1942-5-1 1153 Riverside Joshua Tree National Monument Comment
  RSA659617  Aristida purpurea J. C. Roos 1965-9-26 s.n. Riverside Palm Springs. 122 Comment
  SEINET14214762  Aristida purpurea J. C. Roos 1965-8-15 Riverside Gilman Hot Springs, San Jacinto Valley Comment
  UCSB37780  Aristida purpurea Roos, John 1965-8-15 Riverside Gilman Hot Springs, San Jacinto Valley Comment
  UCSB37795  Aristida purpurea Roos, John 1965-9-26 Riverside Palm Springs 121 Comment
  UCSB51394  Aristida purpurea Roos, John 1965-6-23 Riverside Lost Palms Canyon, Eagle Mtns Comment
  SEINET14198857  Aristida purpurea J. C. Roos 1966-4-22 Riverside Rocky hills between March AFB and Lakeview Comment
  CAS-BOT-BC137535  Aristida purpurea var. nealleyi John C. Roos 1955-5-13 6338 Inyo West base Last Chance Mountains, east of Eureka Valley sand dunes. 1219 Comment
  CLARK-A1528-7798  Aristida purpurea var. nealleyi John C. Roos 1949-4-11 4242 Riverside Hayfield Comment
  CLARK-A1528-7867  Aristida purpurea var. nealleyi John C. Roos, Lucille Roos 1950-10-21 5012 San Bernardino Little San Bernardino Mountains 1219 Comment
  POM264354  Aristida purpurea var. nealleyi J. C. Roos 1938-8-7 582 Riverside East of Hemet, in mountains along San Jacinto River. Comment
Read comments
Apr 3 2011
  UC1043026  Aristida purpurea var. nealleyi John and Lucille Roos 1952-5-11 5655 San Bernardino 2 1/2 mi se Loma Linda; Scott's Canyon 426 Comment
  UCR23877  Aristida purpurea var. nealleyi John C. Roos 1955-5-13 6338 Inyo Northern Mojave Desert, west base of Last Chance Mtns, east of Eureka Valley sand dunes 1223 Comment
  POM266629  Aristida purpurea var. parishii J. C. Roos 1940-2-17 891 San Bernardino Reche Canyon, off San Bernardino Valley. Comment
  RSA444684  Aristida purpurea var. parishii J. C. Roos 1965-6-13 s.n. Riverside Near Highway 74: W base of San Jacinto Mountains near San Jacinto River. Comment
  RSA457403  Aristida purpurea var. purpurea J. C. Roos 1950-8-4 s.n. San Bernardino N side of Clark Mountain, east Mojave Desert. Comment
  RSA457405  Aristida purpurea var. purpurea J. C. Roos 1965-9-26 s.n. Riverside Palm Springs. 122 Comment
  RSA648675  Aristida purpurea var. purpurea J. C. Roos 1954-5-8 6106 Inyo Titus Canyon below Klare Spring, Grapevine Mountains 915 Comment
  POM263172  Aristida ternipes var. hamulosa J. C. Roos 1937-7-20 366 San Bernardino Mentone. Comment
  CLARK-A1528-1563  Artemisia douglasiana Alfred R. Roos 1937-11-15 San Bernardino Loma Linda Comment
  CLARK-A1528-1569  Artemisia douglasiana John C. Roos 1937-8-8 1022 Inyo Sierra Nevada Mountains Comment
  CLARK-A1528-1564  Artemisia douglasiana John C. Roos 1968-10-12 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-155  Artemisia dracunculus John C. Roos 1951-9-23 Riverside Reche Canyon Comment
  CLARK-A1528-1573  Artemisia dracunculus John C. Roos 1968-9-21 San Bernardino San Bernardino Mountains 2438 Comment
  CLARK-A1528-1574  Artemisia dracunculus John C. Roos 1948-10-16 Riverside Beaumont Comment
  UCR31736  Artemisia ludoviciana subsp. incompta John C. Roos, L. Roos 1948-9-7 4000 Mono Sierra Nevada Mtns, Tioga Pass 2683 Comment
  SD52927  Artemisia norvegica subsp. saxatilis J. C. Roos, A. R. Roos 1955-8-26 6555 Inyo Summit Waucoba Mountain. 3350 Comment
  CLARK-A1528-5119  Artemisia nova John C. Roos 1951-8-8 5089 Inyo White Mountains 2590 Comment
  CLARK-A1528-1586  Artemisia nova John C. Roos 1947-9-20 2805 Inyo Panamint Mountains 2590 Comment
  RSA92753  Artemisia nova J. C. Roos, A. R. Roos 1954-8-14 6210 Inyo 1 1/2 miles east of Andrews Mountain, Inyo Mountains 2561 Comment
  UCR19496  Artemisia tridentata Alfred R. Roos 1948-10-29 s.n. San Bernardino San Bernardino Mtns., summit of Cajon Pass 1223 Comment
  RSA48852  Artemisia tridentata subsp. parishii J. C. Roos 1949-11-24 4699 Los Angeles 8 or 9 miles W of Lancaster. 732 Comment
  CAS-BOT-BC93600  Artemisia tridentata subsp. tridentata John Roos; Lucille Roos 1947-9-20 2806 Inyo Wild Rose Canyon, Panamint Mts. 2377 Comment
  CLARK-A1528-1045  Artemisia tridentata subsp. tridentata Alfred R. Roos 1948-10-29 San Bernardino Cajon Pass 1219 Comment
  LA102369  Artemisia tridentata subsp. tridentata Alfred R. Roos; 1950-8-6 sn San Bernardino Kingston Range, N side of Kingston Range, pass on the road to Tecopa and slopes above 1523 Comment
  CLARK-A1528-7777  Asclepias albicans John C. Roos 1965-7-23 Riverside Eagle Mountains Comment
  CLARK-A1528-3183  Asparagus officinalis John C. Roos 1965-9-19 San Bernardino Loma Linda Comment
  RSA0011743  Asplenium vespertinum J. C. Roos 1941-3-8 211 San Bernardino Reche Canyon. Comment
  CAS-BOT-BC99233  Aster J. C. Roos; A. R. Roos 1955-8-28 6570 Inyo West side Owens Lake 3 miles north of Olancha 1091 Comment
  CLARK-A1528-1602  Aster ascendens John C. Roos 1946-9-21 3080 San Bernardino San Bernardino Mountains Comment
  RSA40608  Aster ascendens J. C. Roos 1946-9-14 3014 Riverside Thomas Valley 1375 Comment
  RSA69827  Aster bernardinus J. C. Roos 1951-10-19 5323 Riverside San Timoteo Canyon, El Casco. 610 Comment
  RSA662534  Aster carnosus J. C. Roos 1956-8-2 6591 San Bernardino San Bernardino Valley [Loma Linda] north side of Hwy 99, 0.2 miles west of Waterman Ave. Comment
  CLARK-A1528-1606  Aster exilis John C. Roos 1949-9-25 4668 San Bernardino Loma Linda Comment
  UCR24404  Aster frondosus John C. Roos, A. R. Roos 1955-8-28 6564 Inyo Owens Valley, on the west side of Owens Lake, 3 miles north of Olancha 1082 Comment
  SD52915  Aster frondosus J. C. Roos, A. R. Roos 1955-8-28 6564 Inyo West side Owens Lake, 3 miles north of Olancha. 1079 Comment
  RSA44885  Aster ledophyllus J. C. Roos 1948-9-1 3949 Siskiyou Pass southwest of Etna Comment
  UCR19195  Aster occidentalis John C. Roos 1952-7-30 5863 Mono White Mountains, along Crooked Creek 2835 Comment
  UCR26075  Aster occidentalis John C. Roos 1949-7-16 4563 San Bernardino San Bernardino Mtns., Moonridge Ski Area, Bear Valley 2256 Comment
  CLARK-A1528-7793  Aster pauciflorus John C. Roos 1949-6-28 4527 Inyo Tecopa 426 Comment
  CLARK-A1528-7794  Aster pauciflorus John C. Roos 1949-6-28 4527 Inyo Tecopa 426 Comment
  RSA45212  Astragalus acutirostris J. C. Roos 1949-4-30 4278 San Bernardino Apple Valley 915 Comment
  CLARK-A1528-5566  Astragalus allochrous John C. Roos 1949-4-10 4228 Riverside Chuckwalla Mountains Comment
  RSA444474  Astragalus allochrous var. playanus J. C. Roos 1949-4-10 4228 Riverside Chuckawalla Mountains: Rocky hillside about 3.5 mi. SE of Desert Center. Comment
  RSA0006712  Astragalus bicristatus J. C. Roos 1937-5-31 491 Los Angeles Big Pines. Comment
  CAS-BOT-BC178792  Astragalus calycosus J. C. Roos 1947-7-11 2903 Inyo Mohagany Flats, Panamint Mts. 2499 Comment
  CLARK-A1528-5099  Astragalus calycosus John C. Roos 1967-8-5 Inyo Inyo Mountains 3200 Comment
  UC1234829  Astragalus calycosus var. calycosus J. C. Roos 1955-6-19 6444 Inyo 2 mi w Last Chance Spring (summit ridge Last Chance Mountains); Last Chance Mountains, w of Last Chance Spring 2529 Comment
  UCR30618  Astragalus crotalariae John C. Roos 1947-3-1 3305 Imperial Sonoran (Colorado) Desert, Fish Springs, Salton Sink, on the W/ NW side of the Salton Sea. -61 Comment
  CLARK-A1528-2737  Astragalus didymocarpus John C. Roos 1952-4-9 5484 Riverside Fairmount Park 259 Comment
  RSA659768  Astragalus didymocarpus J. C. Roos 1952-4-30 5606 Riverside Hills between Camp Haan and Riverside 518 Comment
  UCR20403  Astragalus didymocarpus var. didymocarpus John C. Roos 1952-4-9 5484 Riverside Hill by Fairmont Park, Riverside 259 Comment
  RSA45537  Astragalus didymocarpus var. dispermus J. C. Roos 1949-3-9 4113 Riverside Near Indio Comment
  CAS-BOT-BC186870  Astragalus gilmanii John Roos; Lucille Roos 1947-7-13 2887 Inyo Arcane Meadows, Panamint Mts. 3048 Comment
  CAS-BOT-BC186906  Astragalus insularis var. harwoodii J. C. Roos 1958-3-15 s.n. Riverside Chuckwalla Mtns., 3 miles SE of Desert Center Comment
  CAS-BOT-BC186922  Astragalus inyoensis John C. Roos 1955-5-15 6371 Inyo 0.5 miles west of Willow Spring. Last Chance Mts. 1767 Comment
  GH366290  Astragalus inyoensis J. C. Roos 1955-5-15 6371 Unknown 0.5 miles west of Willow Spring. Last Chance Mts. 1767 Comment
  UCR18983  Astragalus kentrophyta John C. Roos, L. Roos 1952-7-26 5820 Inyo White Mtns, east side of Reed Flat, at the head of Birch Creek 3049 Comment
  UCR25677  Astragalus kentrophyta John C. Roos, A. R. Roos 1953-8-9 5952 Inyo Northern Mojave Desert Region, Inyo Mountains, near head of Tamarack Canyon 3049 Comment
  CLARK-A1528-2747  Astragalus kentrophyta subsp. implexus John C. Roos 1937-8-5 1034 Inyo White Mountains Comment
  CLARK-A1528-5094  Astragalus kentrophyta subsp. implexus John C. Roos 1952-7-26 5820 Inyo White Mountains 3047 Comment
  RSA71714  Astragalus kentrophyta var. elatus J. C. Roos, Lucille Roos 1952-7-26 5820 Inyo East side Reed Flat at head of Birch Creek, White Mts. 3049 Comment
  CLARK-A1528-4957  Astragalus layneae John C. Roos 1947-4-19 3464 Inyo Dante's View Comment
  POM262989  Astragalus layneae J. C. Roos 1937-5-30 489 San Bernardino Adelanto, Mojave Desert. Comment
  UCR30555  Astragalus layneae John C. Roos 1938-4-15 1624 Inyo Owens Valley, Olancha 1115 Comment
  RSA79720  Astragalus lentiginosus J. C. Roos 1953-8-9 5965 Inyo upper Tamarack Canyon, Inyo Mts. 3110 Comment
  UCR25920  Astragalus lentiginosus John C. Roos, Lucille Roos 1949-4-9 4211 San Bernardino Sonoran (Colorado) Desert, [Near Freda], Freda Basin in Ward Valley, south of the Turtle Mtns 305 Comment
  CLARK-A1528-5424  Astragalus lentiginosus var. fremontii John C. Roos 1949-5-28 4341 San Bernardino Clark Mountain Range Comment
  CAS-BOT-BC26630  Astragalus lentiginosus var. micans John C. Roos 1955-5-13 6354 Inyo SE end Eureka Valley 929 Comment
  CAS-BOT-BC27705  Astragalus lentiginosus var. micans John C. Roos 1955-5-13 6354 Inyo Lower sloopes of sand dunes at SE end of Eureka Valley, E of Inyo Mts. 929 Comment
  NY675942  Astragalus lentiginosus var. semotus J. C. Roos 1953-8-9 5965 Inyo Upper end of Tamarack Canyon, Inyo Mountains 3109 Comment
  RSA45523  Astragalus magdalenae var. peirsonii J. C. Roos 1949-4-7 4170 Imperial West of Yuma. Comment
  RSA44247  Astragalus minthorniae var. villosus J. C. Roos 1949-5-29 3540 San Bernardino Greene Mine, N side of Clark Mtn. 1585 Comment
  UCR25857  Astragalus nutans John C. Roos 1937-4-26 802 San Bernardino Eastern Mojave Desert, Providence Mtns. Comment
  UCSB42213  Astragalus nuttallianus Roos, John 1958-3-15 Riverside 3 miles SE of Desert Center, in the Chuckwalla Mtns. Comment
  CLARK-A1528-4931  Astragalus oophorus John C. Roos 1948-7-2 3908 Inyo Panamint Mountains Comment
  RSA44876  Astragalus oophorus J. C. Roos 1948-7-3 3904 Inyo Panamint Mountains: South of Arcane Meadows. Comment
  CLARK-A1528-1152  Astragalus tricarinatus John C. Roos 1973-3-31 Riverside Whitewater 457 Comment
  CLARK-A1528-5528  Astragalus tricarinatus John C. Roos 1967-3-25 Riverside Whitewater Canyon 457 Comment
  UCR23355  Athyrium filix-femina John C. Roos 1961-8-6 s.n. San Bernardino San Bernardino Mountains, north slope of Green Canyon 2500 Comment
  UCSB46881  Athyrium filix-femina var. cyclosorum Roos, John 1961-8-6 San Bernardino N. slope of Green Canyon, San Bernardino Mtns. 2499 Comment
  CLARK-A1528-2295  Athysanus pusillus John C. Roos 1947-3-21 3363 Riverside Reche Canyon Comment
  CLARK-A1528-2518  Atriplex argentea subsp. expansa John C. Roos 1951-9-15 5209 San Bernardino Loma Linda 304 Comment
  CLARK-A1528-2519  Atriplex argentea subsp. expansa John C. Roos 1938-8-19 2756 San Bernardino Loma Linda Comment
  CLARK-A1528-2533  Atriplex argentea subsp. expansa Alfred R. Roos 1947-7-22 San Bernardino Loma Linda 304 Comment
  CLARK-A1528-2534  Atriplex argentea subsp. expansa John C. Roos 1946-9-21 3061 San Bernardino Lucerne Valley 914 Comment
  CLARK-A1528-392  Atriplex argentea subsp. expansa John C. Roos 1951-9-15 5209 San Bernardino Loma Linda 304 Comment
  UCR23327  Atriplex argentea subsp. expansa Alfred R. Roos 1947-7-22 s.n. San Bernardino San Bernardino Valley, Loma Linda 305 Comment
  POM265718  Atriplex californica J. C. Roos 1940-6-14 1890 Monterey Seventeen Mile Drive. Comment
  CLARK-A1528-5656  Atriplex canescens John C. Roos 1965-7-21 San Bernardino Victorville Comment
  RSA659776  Atriplex canescens J. C. Roos 1949-4-6 4157 Imperial Near Frink. Comment
  UCR18888  Atriplex canescens Alfred R. Roos 1948-9-15 s.n. Los Angeles Transverse Range/Mojave Desert, Mint Canyon, south of Palmdale Comment
  RSA85282  Atriplex confertifolia J. C. Roos, A. Roos 1950-8-7 4925 Inyo Tecopa, Eastern Mojave Desert. Comment
  UCR20332  Atriplex confertifolia John C. Roos, A. R. Roos 1950-8-7 4925 Inyo Northern Mojave Desert, Tecopa in Amargosa River Valley 427 Comment
  UCR18789  Atriplex coronata var. notatior John C. Roos 1952-5-14 5668 Riverside Perris-Aguanga Basin, 1 mi SE of Perris. San Jacinto River bottomlands. Comment
  RSA92585  Atriplex coronata var. notatior J. C. Roos 1952-5-14 5668 Riverside San Jacinto river bottomlands 1 miles southeast of Perris. 426 Comment
  CLARK-A1528-6887  Atriplex elegans subsp. fasciculata John C. Roos 1965-7-6 San Bernardino Barstow Comment
  CLARK-A1528-5218  Atriplex hymenelytra John C. Roos 1937-4-25 769 San Bernardino Amboy Crater Comment
  UCR24115  Atriplex hymenelytra John C. Roos 1937-12-28 s.n. Inyo Olancha Comment
  CLARK-A1528-2522  Atriplex hymenelytra John C. Roos 1965-7-11 Inyo Death Valley Comment
  CAS-BOT-BC169156  Atriplex lentiformis John Roos 1950-10-31 5022 San Bernardino 237 South Waterman Ave., San Bernardino 320 Comment
  UC1010323  Atriplex lentiformis John C. Roos 1950-10-31 5022 San Bernardino San Bernardino San Bernardino (237 South Waterman Ave.) 320 Comment
  RSA92769  Atriplex lentiformis J. C. Roos, L. Roos 1954-9-25 6251 San Bernardino Corner of Victoria and Lynwood Drive, norh of Patton, San Bernardino Valley. Comment
  UCR24119  Atriplex nummularia John C. Roos 1937-9-2 2555 Los Angeles Playa del Rey Comment
  CLARK-A1528-5408  Atriplex parryi John C. Roos 1950-4-7 4726 Inyo Tecopa 426 Comment
  UCR30767  Atriplex parryi John C. Roos, A. R. Roos 1950-8-7 4926 Inyo Northern Mojave Desert, Tecopa in Amargosa River Valley 427 Comment
Read comments
Sep 26 2010
  CLARK-A1528-2497  Atriplex parryi John C. Roos 1965-7-11 Inyo Amargosa River Comment
  LA102296  Atriplex parryi John C. Roos; 1965-7-11 sn Inyo Amargosa River Comment
  CLARK-A1528-1183  Atriplex patula subsp. hastata John C. Roos 1949-10-1 4678 Orange Doheney Beach 1-3 Comment
  CAS-BOT-BC176482  Atriplex polycarpa J. C. Roos; A. R. Roos 1954-8-13 6205 Inyo West base of sand dunes, Eureka Valley 914 Comment
  CAS-BOT-BC176549  Atriplex polycarpa J. C. Roos 1965-7-6 s.n. San Bernardino At the cement plant, Victorville Comment
  CLARK-A1528-2548  Atriplex polycarpa John C. Roos 1965-7-6 San Bernardino Victorville Comment
  CLARK-A1528-2549  Atriplex polycarpa John C. Roos 1943-12-19 2763 Riverside Mecca Hills Comment
  CLARK-A1528-5396  Atriplex polycarpa John C. Roos 1954-8-13 6205 Inyo Eureka Valley 914 Comment
  CLARK-A1528-7837  Atriplex polycarpa John C. Roos 1947-1-26 3210 San Bernardino Trona Comment
  RSA52770  Atriplex prostrata J. C. Roos 1949-11-27 4701 Kern Monolith Dry Lake 1204 Comment
  UCR23313  Atriplex rosea John C. Roos 1950-8-23 4946 San Bernardino San Bernardino Valley, Loma Linda 320 Comment
  UCR24093  Atriplex semibaccata John C. Roos 1937-9-7 s.n. Los Angeles Westwood Village, Los Angeles 90 Comment
  CLARK-A1528-2506  Atriplex serenana John C. Roos 1946-8-26 2933 San Bernardino Loma Linda Comment
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Jan 21 2015
  UCR18899  Atriplex serenana John C. Roos 1965-8-3 s.n. Riverside Gilman Hot Springs Comment
  UCSB42262  Atriplex spinifera Roos, J. 1965-9-18 San Bernardino 5 miles north of Kramer Junction; Mojave Desert Comment
  CLARK-A1528-5409  Atriplex torreyi John C. Roos 1950-8-8 San Bernardino Oro Grande Comment
  CLARK-A1528-40  Avena fatua John C. Roos 1951-9-25 Riverside Riverside 259 Comment
  CLARK-A1528-4496  Avena fatua Alfred R. Roos 1938-2-13 San Bernardino Loma Linda Comment
  CLARK-A1528-1619  Baccharis brachyphylla John C. Roos 1958-9-27 Riverside San Jacinto Mountains 914 Comment
  UCR19495  Baccharis brachyphylla John C. Roos 1963-10-19 s.n. Riverside San Bernardino Mtns., Whitewater Wash near Painted Hill 581 Comment
  CLARK-A1528-164  Baccharis douglasii John C. Roos 1951-9-25 5284 Riverside Riverside 259 Comment
  CLARK-A1528-1622  Baccharis emoryi John C. Roos 1937-9-12 Riverside Santa Ana River Comment
  CLARK-A1528-165  Baccharis emoryi John C. Roos 1951-9-25 5285 Riverside Riverside 259 Comment
  CLARK-A1528-1638  Baccharis glutinosa John C. Roos 1951-10-24 5346 Riverside Santa Ana River 259 Comment
  CLARK-A1528-166  Baccharis glutinosa John C. Roos 1951-10-24 5346 Riverside Riverside 259 Comment
  RSA48878  Baccharis salicifolia J. C. Roos 1949-9-21 4664 Riverside Reche Canyon, 2.7 miles south of Hollow Hill Dairy 457 Comment
  UCR26078  Baccharis salicifolia John C. Roos, A. R. Roos 1954-8-15 6222 Inyo Northern Mojave Desert, Saline Valley, below mouth of Hunter Canyon 367 Comment
  RSA444680  Baccharis sarothroides J. C. Roos 1965-10-10 sn. San Diego 8 mi East of Dulzura. Comment
  UCSB42282  Baccharis sarothroides Roos, John 1965-9-18 Inyo Wild Rose Canyon, Panamint Mtns. Comment
  CAS-BOT-BC99859  Baccharis sergiloides J. C. Roos 1965-9-18 s.n. Inyo Wild Rose Canyon, Panamint Mtns. Comment
  CLARK-A1528-1633  Baccharis sergiloides John C. Roos 1965-10-10 San Diego Comment
  CLARK-A1528-1634  Baccharis sergiloides John C. Roos 1947-8-2 3731 San Bernardino San Bernardino Mountains 1310 Comment
  RSA48677  Baccharis sergiloides J. C. Roos 1949-8-14 4618 San Bernardino Keystone Spring, Keystone Canyon, New York Mts. 1707 Comment
  UCR19179  Baccharis sergiloides John C. Roos 1948-9-14 3003 Riverside Santa Rosa Mtns, Dos Palmas Spring, east of Asbestos Mountain 1070 Comment
  RSA301479  Bacopa eisenii J. C. Roos 1937-8-4 1962 Inyo Owens River, near Lone Pine. Comment
  RSA40605  Bahia dissecta J. C. Roos 1946-8-27 2923 Riverside Santa Rosa Mountains. 2287 Comment
  UCR26076  Bahia dissecta John C. Roos 1946-8-27 2923 Riverside Peninsular Range, Santa Rosa Mtns 2287 Comment
  CLARK-A1528-7861  Barbarea orthoceras John C. Roos 1947-5-31 3664 Los Angeles San Gabriel Mountains Comment
  CLARK-A1528-403  Bassia hyssopifolia John C. Roos 1951-9-15 5206 San Bernardino Loma Linda 304 Comment
  UCSB45938  Bassia hyssopifolia Roos, John 1965-7-3 San Bernardino Loma Linda Comment
  CLARK-A1528-1648  Bebbia juncea John C. Roos 1995-6-19 Riverside Santa Ana Mountains Comment
  RSA450419  Bebbia juncea J. C. Roos 1965-6-19 s.n. Riverside Skyline Drive, S of Corona Comment
  CLARK-A1528-1649  Bellis perennis John C. Roos 1965-6-21 San Bernardino San Gabriel Mountains Comment
  CLARK-A1528-5632  Berberis dictyota John C. Roos 1947-1-31 3215 Riverside Reche Canyon Comment
  UCR23382  Berberis haematocarpa John C. Roos 1949-6-22 4437 San Bernardino Eastern Mojave Desert, New York Mtns., at and near Lecyr Well 1524 Comment
  CLARK-A1528-4876  Berberis nevinii John C. Roos 1937-2-27 476 San Bernardino San Timoteo Canyon Comment
  LA102288  Berberis nevinii J. C. Roos; 1966-2-10 sn San Bernardino San Timoteo Canyon, S of Redlands Comment
  UC1494263  Berberis nevinii J. C. Roos 1996-2-10 San Bernardino s Redlands (San Timoteo Canyon) Comment
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Oct 23 2014
  POM251784  Bernardia incana J. C. Roos 1936-4-5 s.n. San Diego San Felipe Valley. Comment
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Sep 29 2009
  UCR18798  Betula occidentalis John C. Roos 1965-8-9 s.n. Inyo Sierra Nevada Mountains, Independence Creek [near Onion Valley] 2896 Comment
  CLARK-A1528-5452  Bidens frondosa John C. Roos 1951-9-25 5265 Riverside Riverside 259 Comment
  UCR30556  Bidens frondosa John C. Roos 1948-9-1 3942 Siskiyou Marsham Stream at Yreka Comment
  CLARK-A1528-1653  Bidens pilosa John C. Roos 1951-9-25 5264 Riverside Riverside 259 Comment
  CLARK-A1528-1654  Bidens pilosa John C. Roos 1965-8-18 Riverside Corona Comment
  UCR23741  Bidens pilosa John C. Roos 1965-8-18 s.n. Riverside In Corona Comment
  CLARK-A1528-1518  Bloomeria crocea John C. Roos 1958-5-2 Los Angeles Brentwood Comment
  CLARK-A1528-1519  Bloomeria crocea John C. Roos 1947-5-11 3606 Los Angeles Pomona Comment
  GH378785  Boechera lemmonii J. C. Roos & L. Roos 1951-8-10 5144 Unknown east face White Mtn. Peak, White Mts. 4145 Comment
  POM251754  Boerhavia J. C. Roos 1937-8-20 12 Riverside East of Desert Center. Comment
  RSA158110  Boerhavia annulata J. C. Roos 1955-7-23 6510 Inyo Mouth of Beveridge Canyon, east base Inyo Mts., Saline Valley 610 Comment
  UCR23447  Boerhavia annulata John C. Roos 1955-5-13 6350 Inyo Northern Mojave Desert, west base of Last Chance Mountains, east of Eureka Valley sand dunes 1280 Comment
  CLARK-A1528-3272  Boerhavia wrightii John C. Roos 1937-8-20 Riverside Desert Center Comment
  RSA41282  Boerhavia wrightii J. C. Roos 1937-8-22 14 Riverside Colorado River, north of Blythe. Comment
  RSA449949  Boerhavia wrightii J. C. Roos 1937-8-20 s.n. Riverside East of Desert Center. Comment
  UC1010320  Boerhavia wrightii John and Lucille Roos 1950-10-21 5018 San Bernardino Mohave Desert, Twenty-nine Palms 579 Comment
  UCR19111  Boerhavia wrightii John C. Roos 1965-9-5 s.n. Riverside Sonoran (Colorado) Desert, Desert Center Comment
  CLARK-A1528-4501  Bothriochloa barbinodis John C. Roos 1947-2-15 3236 Riverside Eagle Mountains Comment
  CLARK-A1528-5154  Bothriochloa barbinodis John C. Roos 1947-2-15 3236 Riverside Eagle Mountains Comment
  UCR23358  Botrychium simplex John C. Roos 1967-6-25 s.n. San Bernardino San Bernardino Mountains, Fish Creek Meadows Comment
  UCR26315  Botrychium simplex John C. Roos 1960-7-11 s.n. Mono White Mountains, Crooked Creek. 2888 Comment
  CAS-BOT-BC145587  Bouteloua aristidoides J. C. Roos 1965-9-5 s.n. Riverside Desert Center. Comment
  CLARK-A1528-4507  Bouteloua aristidoides John C. Roos 1937-8-22 478 Riverside Comment
  UCR23965  Bouteloua aristidoides John C. Roos 1946-9-14 3026 Riverside Santa Rosa Mtns., Pinyon Flats 1220 Comment
  UCR23966  Bouteloua aristidoides John C. Roos 1949-3-19 4110 Riverside Sonoran (Colorado) Desert, Mouth of Shaver's Wash near Mecca Comment
  UCSB51393  Bouteloua aristidoides Roos, John 1946-9-14 Riverside Pinyon Flats, Santa Rosa Mtns 1219 Comment
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Apr 3 2011
  LA102177  Bouteloua aristidoides var. aristidoides John C. Roos; 1946-10-26 3139 Riverside Chuckwalla Mountains Comment
  POM266615  Bouteloua barbata J. C. Roos 1937-8-20 1227 Riverside Blythe Comment
  CLARK-A1528-4515  Bouteloua curtipendula John C. Roos, Alfred R. Roos 1950-8-5 4901 San Bernardino Clark Mountains 1645 Comment
  RSA41332  Bouteloua curtipendula J. C. Roos 1948-5-2 1122 Riverside Wonderland of Rocks, Joshua Tree National Monument. Comment
  RSA44268  Bouteloua curtipendula J. C. Roos 1949-6-18 3551 San Bernardino Southeastern base of Clark Mountain, eastern Mojave Desert. 1829 Comment
  RSA47325  Bouteloua curtipendula J. C. Roos, L. Roos 1949-6-22 4442 San Bernardino Mouth of Keystone Canyon, New York Mountains 1677 Comment
  RSA450458  Bouteloua eriopoda J. C. Roos 1950-8-4 4890 San Bernardino N side of Clark Mountain, east Mojave Desert. Comment
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Aug 11 2011
  RSA47326  Bouteloua eriopoda J. C. Roos, Lucille Roos 1949-6-23 4462 San Bernardino Lanfair Valley, north of Hackberry Mountain. 1311 Comment
  UC1023410  Bouteloua eriopoda J. C. and A. R. Roos 1950-8-4 4890 San Bernardino n slopes Clark Mtn.; eastern Mohave Desert 1219 Comment
  POM263104  Bouteloua gracilis J. C. Roos 1937-7-27 326 San Bernardino East end of Bear Valley, San Bernardino Mountains Comment
  UCR23916  Bouteloua gracilis John C. Roos 1946-9-28 3089 San Bernardino San Bernardino Mtns., Upper Santa Ana Canyon, at the South Fork Public Camp 1936 Comment
  UCR25778  Bowlesia incana John C. Roos 1952-4-13 5536 Riverside N side of the Box Springs Mountains 457 Comment
  POM265673  Boykinia rotundifolia J. C. Roos 1942-8-15 1753 San Bernardino Hillside south of and below Crestline. Comment
  POM265674  Boykinia rotundifolia J. C. Roos 1937-7-15 2422 San Bernardino Bonita Falls, Lytle Creek. Comment
  CLARK-A1528-5666  Brandegea bigelovii John C. Roos 1960-4-8 Riverside 380 Comment
  CLARK-A1528-5504  Brickellia arguta John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  RSA105038  Brickellia arguta J. C. Roos 1955-5-13 6337 Inyo West base Last Chance Mountains, east of Eureka Valley sand dunes 1220 Comment
  UC1236250  Brickellia atractyloides John C. Roos 1955-5-13 6337 Inyo e of Eureka Valley sand dunes; Last Chance Mts. (west base) 1219 Comment
  RSA48875  Brickellia californica J. C. Roos 1949-9-3 4649 San Bernardino Tecopa Pass, Kingston Mountains. 1524 Comment
  CAS-BOT-BC106152  Brickellia desertorum John Roos; Lucille Roos 1950-9-20 4993 San Bernardino N.W. base of Blue (Rattlesnake) Mtn. at east end DeBerry Stree, Midway beetween Loma Linda and Highgrove. 381 Comment
  CAS-BOT-BC106184  Brickellia desertorum John Roos; Lucille Roos 1950-9-9 4986 Riverside Mt. Rubidoux, Riverside 396 Comment
  CAS-BOT-BC106189  Brickellia desertorum John C. Roos 1950-10-15 5009 Riverside Dry Morongo Canyon about 1 mile south of Riverside-San Bernardiino County line. 609 Comment
  CAS-BOT-BC106190  Brickellia desertorum John Roos; Lucille Roos 1950-10-14 5006 Riverside East end Jurupa Hills near corner of Alta and Canal Sts., West Riverside 304 Comment
  CLARK-A1528-1663  Brickellia desertorum John C. Roos 1949-9-21 4665 Riverside Reche Canyon 457 Comment
  CLARK-A1528-1664  Brickellia desertorum John C. Roos 1949-9-17 4662 Riverside Whitewater Canyon 609 Comment
  POM302522  Brickellia desertorum J. C. Roos 1943-8-17 2709 San Bernardino Reche Canyon, off San Bernardino Valley Comment
  RSA52805  Brickellia desertorum J. C. Roos, L. Roos 1950-9-9 4986 San Bernardino Mt. Rubidoux. 396 Comment
  RSA89894  Brickellia desertorum J. C. Roos, L. Roos 1950-10-28 5020 Riverside N base Mt. Russell, 1 mi SE of Moreno. 550 Comment
  RSA89966  Brickellia desertorum J. C. Roos 1950-10-15 5009 Riverside San Bernardino Mtns. Dry Morongo Canyon, c. l mi south of Riverside-San Bernardino county line. 612 Comment
  UCR23270  Brickellia desertorum John C. Roos, L. Roos 1950-10-28 5020 Riverside Perris-Aguanga basin region, N base Mt. Russell, 1 mi SE of Moreno 550 Comment
  UCR23273  Brickellia desertorum John C. Roos, L. Roos 1950-9-9 4986 Riverside Mt. Rubidoux. 400 Comment
  UCSB51163  Brickellia desertorum Roos, John 1943-8-17 San Bernardino Reche Canyon, San Bernardino Valley Comment
  RSA44888  Brickellia greenei J. C. Roos 1948-9-2 3975 Siskiyou 5 mi SW of Yreka. Comment
  UCR19259  Brickellia greenei John C. Roos 1948-9-2 3975 Siskiyou 5 mi SW of Yreka Comment
  UCSB37839  Brickellia greenei Roos, John 1948-9-2 Siskiyou 5 miles S.W. of Yreka Comment
  CAS-BOT-BC100515  Brickellia incana J. C. Roos 1965-6-23 s.n. Riverside Colorado Desert. Lost Palms Wash, north of Chiriaco Summit near the Eagle Mtns. Comment
  CLARK-A1528-1673  Brickellia incana John C. Roos 1947-11-1 3751 Riverside Eagle Mountains Comment
  CLARK-A1528-1674  Brickellia incana John C. Roos 1947-4-18 3452 San Bernardino Cronese Lake Comment
  UCR30496  Brickellia microphylla John C. Roos, A. R. Roos 1953-8-14 6029 Inyo Northern Mojave Desert, Inyo Mtns., Al Rose Canyon 2141 Comment
  CLARK-A1528-1686  Brickellia multiflora John C. Roos, Lucille Roos 1947-9-20 2813 Inyo Panamint Range 1249 Comment
  CLARK-A1528-7785  Brickellia oblongifolia var. linifolia John C. Roos 1946-10-5 3116 San Bernardino San Bernardino Mountains 2285 Comment
  RSA47480  Brickellia oblongifolia var. linifolia J. C. Roos, L. Roos 1949-6-24 4473 San Bernardino Summit of Clark Mountain 2409 Comment
  RSA79642  Brickellia oblongifolia var. linifolia J. C. Roos, A. R. Roos 1953-8-10 5982 Inyo branch of Mazourka Canyon, Inyo Mts. 2561 Comment
  RSA47451  Brickellia oblongifolia var. linifolia J. C. Roos, L. Roos 1949-6-27 4519 San Bernardino North slope of Kingston Mts. 1768 Comment
  CAS-BOT-BC132193  Brodiaea filifolia John C. Roos 1952-5-14 5667 Riverside San Jacinto River bottom 1 mile east of Perris 426 Comment
  CLARK-A1528-1522  Brodiaea filifolia John C. Roos 1952-5-14 5667 Riverside San Jacinto River 426 Comment
  RSA92586  Brodiaea filifolia J. C. Roos 1952-5-14 5667 Riverside San Jacinto River bottom 1 mile east of Perris. Comment
  CLARK-A1528-2793  Brodiaea lutea var. anilina John C. Roos 1951-5-27 5049 Mariposa Mariposa 1005 Comment
  CLARK-A1528-4530  Bromus arenarius John C. Roos 1949-6-22 3547 San Bernardino New York Mountains 1737 Comment
  RSA85126  Bromus arizonicus J. C. Roos 1952-4-9 5473 Riverside east base of Mt. Rubidoux 274 Comment
  UCR20584  Bromus arizonicus John C. Roos 1952-4-9 5473 Riverside Riverside, E base of Mt. Rubidoux 274 Comment
  POM266278  Bromus carinatus J. C. Roos 1937-6-18 1239 San Diego Palomar Mountain. Comment
  SEINET901505  Bromus carinatus J. C. Roos 1949-1 4494 San Bernardino Along Damp canyon bottom near a spring, E. slope of Clark Mt., Eastern Mojave desert 1524 Comment
  UCR32865  Bromus carinatus John C. Roos 1949-6-25 4494 San Bernardino Eastern Mojave Desert, east slope of Clark Mountain [probably Colosseum Gorge] 1524 Comment
  UCSB51402  Bromus carinatus Roos, John 1965-7-17 San Bernardino Stetson Creek, Barton Flats, San Bernardino Mtns. Comment
  CAS-BOT-BC148733  Bromus carinatus var. marginatus J. C. Roos 1965-6-26 s.n. San Bernardino Upper Santa Ana Canyon, Heart Bar area. San Bernardino Mtns. Comment
  CAS-BOT-BC148734  Bromus carinatus var. marginatus J. C. Roos 1965-7-17 s.n. San Bernardino San Bernardino Mountains. Barton Flats. Comment
  LA102184  Bromus japonicus John C. Roos; 1950-6-11 4830 San Bernardino Loma Linda, W central 304 Comment
  POM302534  Bromus japonicus J. C. Roos 1943-6-22 2711 San Bernardino edge of Lawn, County Hospital Comment
  UCSB71632  Bromus madritensis subsp. rubens Roos, J. 1965-6-6 San Bernardino Mill Creek, San Bernardino Mtns, near Fallsvale Comment
  POM266277  Bromus maritimus J. C. Roos 1940-6-12 833 San Francisco San Francisco Comment
  CLARK-A1528-4545  Bromus mollis John C. Roos, Lucille Roos 1950-4-15 4740 Riverside Pigeon Pass 457 Comment
  UCR23872  Bromus richardsonii John C. Roos 1940-7-30 1576 San Bernardino San Bernardino Mtns., Bear Valley near Boulder Bay 2134 Comment
  CAS-BOT-BC161805  Bromus rubens J. C. Roos 1965-6-6 s.n. San Bernardino Mill Creek, near Fallsvale, San Bernardino Mountains. Comment
  CLARK-A1528-4550  Bromus rubens John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4555  Bromus rubens John C. Roos, Lucille Roos 1950-4-15 4739 Riverside Pigeon Pass 457 Comment
  CLARK-A1528-1276  Bromus tectorum John C. Roos 1948-7-4 Inyo Panamint Mountains Comment
  CLARK-A1528-4560  Bromus trinii John C. Roos 1969-5-10 Kern Red Rock Canyon Comment
  UCR23968  Bromus trinii John C. Roos 1942-5-2 1120 Riverside Little San Bernardino Mountains, Live Oak Tank 1280 Comment
  UCR23981  Bromus trinii John C. Roos 1969-5-10 s.n. Kern Western Mojave Desert, Red Rock Canyon 793 Comment
  RSA47193  Buddleja utahensis J. C. Roos, Lucille Roos 1949-6-26 4497 San Bernardino Pass in mountains 5.5 miles south of Kingston. 1067 Comment
  UCR18980  Caesalpinia virgata John C. Roos 1965-6-23 s.n. Riverside Sonoran (Colorado) Desert, Cactus City, just east of the Mecca Hills on Interstate Hwy 10 [and 25 mi. east of Indio]. 500 Comment
  UCR30533  Calamagrostis muiriana John C. Roos 1948-9-7 4011 Tuolumne Sierra Nevada Mtns., Yosemite National Park, Tuolumne Meadows 2622 Comment
Read comments
Aug 26 2011
  UCR19364  Calamagrostis nutkaensis John C. Roos 1950-7-22 4869 Sonoma North Coast, Jenner, slopes above sea bluffs 61 Comment
  CLARK-A1528-3811  Calandrinia ambigua John C. Roos 1949-5-5 4098 Riverside Orocopia Comment
  RSA85454  Callitriche marginata J. C. Roos 1952-4-16 5540 Riverside Edgemont, near Box Springs. 488 Comment
  CLARK-A1528-2664  Calocedrus decurrens John C. Roos 1942-12-25 2589 Mariposa Sierra National Forest 1036-1219 Comment
  RSA450207  Calochortus amabilis J. C. Roos 1939-3-27 305 Napa Snell Valley, Pacific Union College, Angwin Comment
  RSA71717  Calochortus bruneaunis J. C. Roos 1952-7-26 5823 Inyo East side Reed Flat at head of Birch Creek, White Mts. 3049 Comment
  CAS-BOT-BC487782  Calochortus bruneaunis J. C. Roos 1955-6-17 6410 Inyo 2 miles NE of Willow Spring, Last Chance Mountains 2011 Comment
  RSA450178  Calochortus catalinae J. C. Roos 1956-4-8 6573 Ventura North slope of ''Bony Mountain'' [Boney Mountain]. Potrero Valley Comment
  POM263553  Calochortus concolor J. C. Roos 1937-6-11 629 San Diego Campo. Comment
  CLARK-A1528-3188  Calochortus invenustus John C. Roos 1950-6-24 4841 San Bernardino San Bernardino Mountains 2224 Comment
  CLARK-A1528-3189  Calochortus invenustus John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  UCR19737  Calochortus invenustus John C. Roos 1953-7-4 5926 San Bernardino San Bernardino Mtns., Barton Flats near store 1921 Comment
  CLARK-A1528-3190  Calochortus kennedyi John C. Roos 1949-4-30 4264 San Bernardino Hesperia 914 Comment
  UCR24142  Calochortus pulchellus John C. Roos 1939-4-18 278 Napa North Coast Range, Pope Valley Grade, Angwin 500 Comment
Read comments
Feb 17 2006
  POM262959  Calochortus splendens J. C. Roos 1941-5-6 135 San Bernardino Near Loma Linda. Comment
  UCR30817  Calochortus striatus John C. Roos 1947-6-21 3694 San Bernardino San Bernardino Mtns, Cushenbury Canyon, alkaline springs [probably Whiskey Springs] on north side of the mountains 1677 Comment
  UCSB46873  Calochortus striatus Roos, John 1969-5-10 Kern Red Rock Canyon Comment
  CLARK-A1528-1794  Calycadenia tenella John C. Roos 1952-7-19 5816 Riverside Santa Ana Mountains 761 Comment
  UCR25993  Calycanthus occidentalis John C. Roos 1948-8-30 3925 Shasta Castle Crag Comment
  CLARK-A1528-3817  Calyptridium umbellatum John C. Roos, Lucille Roos 1951-8-10 5152 Mono White Mountains 4023 Comment
  CLARK-A1528-3820  Calyptridium umbellatum John C. Roos 1936-5-9 San Bernardino San Bernardino Mountains Comment
  UCR25934  Calystegia fulcrata John C. Roos 1949-7-16 4565 San Bernardino San Bernardino Mtns., Moonridge Ski Area, Bear Valley 2256 Comment
  CLARK-A1528-3325  Camissonia cheiranthifolia Alfred R. Roos 1956-5-22 Los Angeles 9 Comment
  UCR23517  Camissonia confusa John C. Roos 1943-5-23 2662 Riverside S Mojave Desert, Little San Bernardino Mtns 1524 Comment
  RSA85157  Camissonia intermedia J. C. Roos 1952-4-16 5546 Riverside Reche Canyon. 457 Comment
  CLARK-A1528-3361  Camissonia strigulosa John C. Roos 1965-6-13 Riverside San Jacinto Mountains Comment
  POM302488  Camissonia strigulosa J. C. Roos 1943-8-8 2703 Riverside Dry flat, Hall Canyon, San Jacinto Mts. 1768 Comment
  CLARK-A1528-3406  Canbya candida John C. Roos, Lucille Roos 1952-5-10 5633 San Bernardino Mojave Desert Comment
  UCR23551  Cardamine debilis Alfred R. Roos 1958-6-12 s.n. Los Angeles Evans and Reeves Nursery, Brentwood, West Los Angeles Comment
  UCR24104  Carex douglasii John C. Roos 1943-10-16 2739 Riverside Southern Mojave Desert, Falcon Flats, Little San Bernardino Mtns 1524 Comment
  RSA48687  Carex subfusca J. C. Roos 1949-8-13 4606 San Bernardino Copper Queen Mine, Keystone Canyon, New York Mountains 1829 Comment
  CLARK-A1528-1691  Carthamus tinctorius John C. Roos 1965-7-7 Riverside Beaumont Comment
  UCR18581  Carthamus tinctorius John C. Roos, L. Roos 1959-9-2 6599 Sonoma North Coast Ranges, Healdsburg, Healdsburg dump Comment
  CLARK-A1528-4171  Castilleja affinis John C. Roos 1966-4-5 Riverside Winchester Comment
  RSA450156  Castilleja affinis J. C. Roos 1966-4-5 s.n. Riverside Winchester Comment
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Mar 20 2011
  CLARK-A1528-1228  Castilleja affinis subsp. affinis John C. Roos 1937-6-10 1480 San Diego Jacumba 853 Comment
  UCSB42128  Castilleja affinis subsp. affinis Roos, John 1966-4-5 Riverside Winchester Comment
  UCR25193  Castilleja attenuata John C. Roos 1951-5-26 5036 Mariposa Sierra Nevada Mtns, hills about 7 miles east of Mariposa 1037 Comment
  SD65502  Castilleja cinerea John C. Roos 1943-7-4 2717 San Bernardino ridge summit of Sugerloaf Peak, San Bernardino Mts 2987 Comment
  UCSB45534  Castilleja exserta subsp. exserta Roos, John 1941-4-19 Riverside Reche Canyon - "Plateau" Comment
  CLARK-A1528-4177  Castilleja foliolosa John C. Roos 1940-5-4 880 Riverside San Timoteo Canyon Comment
  RSA659605  Castilleja nana J. C. Roos 1967-8-5 s.n. Inyo Summit Ridge eadt of Badger flat. 3201 Comment
  UC1023408  Castilleja nana J. C. and A. R. Roos 1953-8-9 5960 Inyo near head of Tamarack Canyon; Inyo Mountains 3048 Comment
  UCR25811  Castilleja plagiotoma John C. Roos 1949-4-30 4263 San Bernardino Mojave Desert, 6 mi. SW of Hesperia 1067 Comment
  UCR19074  Castilleja tenuis John C. Roos 1940-7-16 1848 San Bernardino San Bernardino Mtns., Green Valley Comment
  CLARK-A1528-2305  Caulanthus crassicaulis John C. Roos 1954-6-28 6168 Inyo Inyo Mountains 2255 Comment
  CAS-BOT-BC41003  Caulanthus crassicaulis John C. Roos; Lucille Roos 1954-6-28 6168 Inyo Inyo Mountains. Southwest slope Little Cowhorn Valley. 2255 Comment
  CAS-BOT-BC41005  Caulanthus crassicaulis J. C. Roos 1955-6-21 6470 Inyo Inyo Mountains. Little Cowhorn Valley. 2255 Comment
  UCR30594  Caulanthus heterophyllus var. heterophyllus John C. Roos, L. Roos 1954-4-10 6065 San Diego Peninsular Range, San Pasqual 152 Comment
  CAS-BOT-BC40451  Caulanthus inflatus John Roos; Lucille Roos 1952-5-10 5629 San Bernardino Mohave Desert. Kremer Hills. 853 Comment
  POM265804  Ceanothus crassifolius J. C. Roos 1942-3-7 1105 Los Angeles Big Tujunga Canyon. Comment
  CLARK-A1528-3885  Ceanothus cuneatus John C. Roos 1937-3-26 1666 Santa Barbara Cuyama Valley Comment
  CLARK-A1528-3893  Ceanothus greggii John C. Roos 1967-5-13 San Bernardino San Bernardino Mountains 914 Comment
  RSA47547  Ceanothus greggii var. vestitus J. C. Roos, Lucille Roos 1949-6-20 4421 San Bernardino Keystone Canyon, New York Mts 1829 Comment
  CLARK-A1528-3894  Ceanothus integerrimus John C. Roos 1937-6-5 934 San Bernardino San Bernardino Mountains Comment
  POM265805  Ceanothus oliganthus var. oliganthus J. C. Roos 1942-3-21 1097 Los Angeles Chantry Flats, Santa Anita Canyon Comment
  POM265806  Ceanothus spinosus J. C. Roos 1942-3-14 997 Los Angeles Sepulveda Canyon, W Los Angeles Comment
  CLARK-A1528-5085  Ceanothus tomentosus subsp. olivaceus John C. Roos 1966-3-31 San Bernardino San Timoteo Canyon 304 Comment
  UCR24442  Celtis reticulata John C. Roos 1962-8-4 s.n. San Bernardino San Bernardino Valley, 0.3 mi west of the intersection of Bryant Street and Oak Glen Road. In Wilson Creek Wash 823 Comment
  RSA0057839  Cenchrus ciliaris J. C. Roos 1965-10-17 Riverside Along the roadside, 20 miles west of Blythe. Comment
  POM263010  Cenchrus longispinus J. C. Roos 1940-8-31 234 San Bernardino Near Cucamonga. Comment
  UCR23280  Centaurea repens John C. Roos 1950-10-27 5019 San Bernardino San Bernardino Valley, San Bernardino, corner of 9th Street and Waterman Avenue 336 Comment
  UCR23330  Centaurea repens John C. Roos 1948-10-16 s.n. San Bernardino San Bernardino Valley, Wildwood Canyon [=Yucaipa Creek, becomes Live Oak Canyon] near San Timoteo Canyon Comment
  UCR26085  Centaurea repens John C. Roos, L. Roos 1951-10-24 5335 Riverside City of Riverside, between Arlington area and Pedley 229 Comment
  CLARK-A1528-5429  Centaurium calycosum John C. Roos 1965-7-11 Inyo Tecopa Comment
  RSA450238  Centaurium exaltatum J. C. Roos 1965-7-11 s.n. Inyo Tecopa Comment
  CLARK-A1528-2942  Centaurium exaltatum John C. Roos 1937-8-10 1047 Kern Kern River Comment
  RSA662536  Centaurium floribundum J. C. Roos 1957-7-3 6652 Sonoma Healdsberg Comment
  CLARK-A1528-2946  Centaurium venustum John C. Roos 1952-6-13 5766 Riverside Reche Canyon 457 Comment
  CLARK-A1528-5249  Centaurium venustum John C. Roos 1948-4-24 3797 Riverside Whitewater Comment
  CAS-BOT-BC179760  Centrostegia thurberi J. C. Roos 1955-6-18 6422 Inyo 2 mi NE of Willow Spring, Last Chance Mts. 2011 Comment
  RSA92605  Cerastium fontanum J. C. Roos 1952-5-12 5658 San Bernardino Loma Linda 320 Comment
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Jan 24 2010
  UCR23698  Cerastium fontanum subsp. vulgare John C. Roos 1946-9-28 3098 San Bernardino San Bernardino Mtns., Near Fish Creek 2241 Comment
  POM265645  Cerastium fontanum subsp. vulgare J. C. Roos 1937-3-8 1303 San Bernardino Loma Linda, San Bernardino Valley. Comment
  CLARK-A1528-2780  Cercidium microphyllum John C. Roos 1949-4-9 4209 San Bernardino Whipple Mountains Comment
  RSA497910  Cercocarpus betuloides var. betuloides A. R. Roos 1922-11-8 s.n. Los Angeles San Gabriel Mountians: Lytle Creek Canyon 915 Comment
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Aug 18 2012
  UC1234831  Cercocarpus intricatus J. C. Roos 1955-6-19 6452 Inyo 2 mi w of Last Chance Spring (summit ridge of Last Chance Mountains); Last Chance Mountains 2560 Comment
  RSA92174  Cercocarpus intricatus J. C. Roos, L. Roos 1954-6-26 6157 Inyo Tamarack Canyon, Inyo Mountains 2744 Comment
  SD52931  Cercocarpus intricatus J. C. Roos 1955-6-19 6452 Inyo Summit ridge of Last Chance Mountains, 2 miles west of Last Chance Spring. 2560 Comment
  CLARK-A1528-3983  Cercocarpus ledifolius John C. Roos 1965-6-6 San Bernardino Mill Creek Comment
  RSA450098  Cercocarpus ledifolius J. C. Roos 1965-6-6 s.n. San Bernardino San Bernardino Mtns, Mill Creek near Fallsvale. Comment
  RSA79485  Cercocarpus ledifolius J. C. Roos, A. R. Roos 1953-8-13 6009 Inyo Tamarack Canyon. 2744 Comment
  CLARK-A1528-5000  Chaenactis artemisiifolia John C. Roos 1937-5-10 2070 Riverside Comment
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Jun 24 2014
  CAS-BOT-BC276557  Chaenactis douglasii var. douglasii J. C. Roos 1955-6-17 6415 Inyo 2 miles NE of Willow Spring, Last Chance Mountains 2011 Comment
  POM261402  Chaenactis douglasii var. douglasii J. C. Roos 1941-08 51 Inyo Panamint Mts 3201 Comment
Read comments
Jun 20 2012
  CLARK-A1528-1697  Chaenactis glabriuscula John C. Roos 1937-3-26 2478 Santa Barbara Cuyama Valley Comment
  CLARK-A1528-2045  Chaenactis glabriuscula John C. Roos 1941-4-26 157 San Bernardino Comment
  CAS-BOT-BC106010  Chaetadelpha wheeleri J. C. Roos; A. R. Roos 1954-8-13 6208 Inyo Southeast end Eureka Valley 944 Comment
  RSA104137  Chaetadelpha wheeleri J. C. Roos 1955-5-13 6364 Inyo West side Eureka Valley at mouth of Marble Canyon. 1037 Comment
  LA203100  Chaetadelpha wheeleri John C. Roos; Lucille Roos 1954-6-28 6174 Inyo Eureka Valley, Leo Carrillo State Beach, SE-end 929 Comment
  CLARK-A1528-5238  Chaetopappa aurea John C. Roos 1943-4-11 2609 San Bernardino Santa Ana River Comment
  UCR19510  Chaetopappa aurea John C. Roos 1965-7-22 s.n. Riverside San Jacinto Mtns, near Mountain Center 1372 Comment
  RSA72074  Chamaebatiaria millefolium J. C. Roos, L. Roos 1951-8-12 5188 Inyo 1.5 miles South of Reed Flat, White Mts. 2896 Comment
  RSA659482  Chamaesaracha coronopus J. C. Roos 1949-6-22 3548 San Bernardino Barnwell, New York Mountains. Comment
  POM262918  Chamaesyce albomarginata J. C. Roos 1937-6-8 628 San Diego San Felipe Valley. Comment
  RSA52780  Chamaesyce revoluta J. C. Roos 1950-8-4 4891 San Bernardino North side of Clark Mtn. 1220 Comment
  UCR23360  Cheilanthes feei John C. Roos 1955-5-16 6386 Inyo Inyo Mountains, narrow canyon 1.5 mi SW of Loretto Mine along Loretto Rd. 1677 Comment
  POM301706  Cheilanthes newberryi J. C. Roos 1938-5-2 1412 Riverside hills near La Sierra, western Riverside Co. Comment
  RSA47331  Cheilanthes wootonii J. C. Roos, Lucille Roos 1949-6-22 4441 San Bernardino New York Mountains, N side of the mouth of Keystone Canyon 1677 Comment
  CLARK-A1528-2553  Chenopodium album John C. Roos 1947-8-17 Los Angeles San Fernando Valley Comment
  CLARK-A1528-2554  Chenopodium album John C. Roos 1965-7-4 San Bernardino Loma Linda 304 Comment
  CLARK-A1528-5122  Chenopodium ambrosioides var. anthelminticum John C. Roos 1965-8-4 Riverside Comment
  UCR23310  Chenopodium californicum John C. Roos 1952-4-16 5560 Riverside Box Springs Mountains, Pigeon Pass 366 Comment
  CLARK-A1528-2563  Chenopodium incanum John C. Roos 1949-6-22 4456 San Bernardino New York Mountains 1493 Comment
  CLARK-A1528-2564  Chenopodium incanum John C. Roos 1950-9-1 4960 San Bernardino Clark Mountains 1645 Comment
  RSA85647  Chenopodium incanum var. occidentale J. C. Roos, A. Roos 1950-8-7 4922 San Bernardino Drainage from watering trough at Beck s Spring, Kingston MTs. 1372 Comment
  UCR25948  Chenopodium incanum var. occidentale John C. Roos 1938-4-18 1639 San Bernardino Mojave Desert, Cronese Lake 305 Comment
  RSA158114  Chenopodium leptophyllum J. C. Roos 1955-7-23 6506 Inyo Soldier Flat at east base Waucoba Mountain, Inyo Mountains. 2195 Comment
  RSA71767  Chenopodium leptophyllum J. C. Roos, L. Roos 1951-8-8 5112 Inyo North rim Reed Flat, White Mts. 3140 Comment
  CLARK-A1528-2573  Chenopodium pumilio John C. Roos 1965-7-4 San Bernardino Loma Linda Comment
  CLARK-A1528-2569  Chenopodium pumilio John C. Roos 1942-6-17 1276 Los Angeles West Los Angeles Comment
  RSA591740  Chenopodium pumilio J. C. Roos 1965-7-4 s.n. San Bernardino Loma Linda. Comment
  UCR18970  Chenopodium rubrum John C. Roos 1965-9-18 s.n. Inyo Northern Mojave Desert, Darwin Mesa [=Darwin Plateau] Comment
  UCR19734  Chenopodium rubrum John C. Roos, L. Roos 1954-11-23 6258 Inyo SW side of Salt Lake, Saline Valley 323 Comment
  CLARK-A1528-2574  Chenopodium rubrum John C. Roos 1954-11-23 6258 Inyo Saline Valley 323 Comment
  CLARK-A1528-5416  Chenopodium rubrum John C. Roos 1954-8-15 6223 Inyo Saline Valley 323 Comment
  RSA45491  Chenopodium vulvaria J. C. Roos 1948-9-1 3985 Siskiyou Fort Jones. Comment
  POM266290  Chloracantha spinosa J. C. Roos 1937-8-30 2223 San Diego San Ysidro Comment
  CLARK-A1528-1256  Chloris gayana John C. Roos, Alfred R. Roos 1950-9-16 4987 Los Angeles Los Angeles 60 Comment
  UCR23855  Chloris gayana John C. Roos 1965-9-16 s.n. Riverside San Jacinto Comment
  CLARK-A1528-3597  Chorizanthe brevicornu John C. Roos 1948-4-24 3794 Riverside Whitewater 548 Comment
  RSA155683  Chorizanthe brevicornu var. spathulata J. C. Roos 1955-6-20 6459 Inyo Last Chance Mountains 2 miles NE of Willow Spring. Comment
  RSA44875  Chorizanthe brevicornu var. spathulata J. C. Roos 1948-7-3 3902 Inyo Panamint Mountains: South of Arcane Meadows. 3049 Comment
  UCR24251  Chorizanthe leptoceras John C. Roos 1950-6-3 4822 San Bernardino San Bernardino Mtns., Cajon Canyon, 1 mile below 'Blue Cut Comment
  CLARK-A1528-3602  Chorizanthe parryi John C. Roos 1950-5-27 4819 Riverside Reche Canyon 761 Comment
  POM265700  Chorizanthe uniaristata J. C. Roos 1937-4-23 1807 Riverside At Whitewater. Comment
  UCR27545  Chorizanthe xanti John C. Roos 1948-5-8 3827 Riverside San Bernardino Mtns, Whitewater 579 Comment
  CLARK-A1528-2050  Chrysanthemum coronarium Alfred R. Roos 1956-5-22 Los Angeles El Segundo Comment
  RSA431201  Chrysanthemum leucanthemum J. C. Roos 1966-6-26 s.n. San Bernardino Private residence in City of Loma Linda. Comment
  UCR23730  Chrysanthemum leucanthemum John C. Roos 1966-6-26 s.n. San Bernardino San Bernardino Valley, private residence in City of Loma Linda 305 Comment
  CLARK-A1528-1771  Chrysopsis villosa John C. Roos 1965-8-18 Riverside San Jacinto Mountains Comment
  CLARK-A1528-1112  Chrysothamnus albidus John C. Roos 1954-8-15 6224 Inyo Saline Valley 426 Comment
  CLARK-A1528-1705  Chrysothamnus albidus John C. Roos 1954-8-15 6224 Inyo Saline Valley 426 Comment
  CLARK-A1528-1711  Chrysothamnus nauseosus John C. Roos 1951-10-6 5318 San Bernardino San Bernardino Mountains 1828 Comment
  CLARK-A1528-1717  Chrysothamnus nauseosus John C. Roos 1954-8-14 6215 Inyo Inyo Mountains 2316 Comment
  CLARK-A1528-1720  Chrysothamnus nauseosus John C. Roos 1946-9-28 3097 San Bernardino San Bernardino Mountains 2255 Comment
  CLARK-A1528-5462  Chrysothamnus nauseosus John C. Roos, Lucille Roos 1950-10-17 5010 San Bernardino San Bernardino 320 Comment
  UCR19479  Chrysothamnus nauseosus John C. Roos 1948-9-18 4060 San Bernardino Eastern Mojave Desert, north slope of Clark Mountain 1829 Comment
  RSA155660  Chrysothamnus nauseosus subsp. hololeucus J. C. Roos 1955-8-24 6543 Inyo 1mile NE of Willow Spring 1860 Comment
  RSA89965  Chrysothamnus nauseosus subsp. hololeucus J. C. Roos 1950-10-17 5010 San Bernardino Little Pigeon Pass, Barton Road ca. 2 mi. W of Loma Linda. 320 Comment
  UCR18684  Chrysothamnus nauseosus var. speciosus John C. Roos 1950-9-3 4972 San Bernardino Eastern Mojave Desert, Clark Mountain, south slope 1890 Comment
  CLARK-A1528-5612  Chrysothamnus paniculatus John C. Roos 1946-11-2 3152 San Bernardino Burn's Canyon 1219 Comment
  RSA155653  Chrysothamnus parryi subsp. asper J. C. Roos 1955-8-26 6551 Inyo Main ridge between Squaw Peak and Waucoba Mountain. 2957 Comment
  RSA71770  Chrysothamnus parryi subsp. asper J. C. Roos 1951-8-8 5114 Inyo SE rim Reed flat, White Mts 3079 Comment
  CLARK-A1528-1737  Chrysothamnus parryi subsp. imulus John C. Roos 1951-7-28 5071 San Bernardino San Bernardino Mountains 2072 Comment
  CLARK-A1528-1741  Chrysothamnus teretifolius John C. Roos 1938-4-18 Inyo Death Valley National Park Comment
  CAS-BOT-BC100752  Chrysothamnus viscidiflorus subsp. puberulus John Roos; Lucille Roos 1951-8-8 5090 Inyo 3 miles NW of Cedar Flat, White Mts. 2590 Comment
  RSA48876  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos, R. Weatherby 1949-9-2 4643 San Bernardino North slopes Kingston Mts 2072 Comment
  RSA48885  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos 1949-9-2 4638 San Bernardino N side of Kingston Mts 1707 Comment
  SD52928  Chrysothamnus viscidiflorus var. viscidiflorus A. R. Roos, J. C. Roos 1955-8-26 6553 Inyo North shoulder Waucoba Mountain. 3200 Comment
  UC1042996  Chylismia heterochroma J. C. and A. R. Roos 1952-8-14 6213 Inyo 0.4 mi n The Narrows; Inyo Mts., Marble Canyon 2316 Comment
  POM265632  Cicer arietinum J. C. Roos 1937-7-1 2395 Santa Barbara Solvang Comment
  UCSB37895  Cirsium andersonii Roos, John 1948-9-7 Mono Sierra Nevada Mtns. NE of Tuolumne Meadows 2743 Comment
  CAS-BOT-BC105811  Cirsium arizonicum J. C. Roos; A. R. Roos 1953-8-9 5973 Inyo Tamarack Canyon 2743 Comment
  RSA79712  Cirsium arizonicum J. C. Roos 1953-8-9 5973 Inyo Tamarack Canyon. 2988 Comment
  UCR23833  Cirsium arizonicum var. arizonicum John C. Roos 1937-8-8 1016 Inyo Sierra Nevada Mtns., Lone Pine Canyon below Mt. Whitney 3506 Comment
  UCR23333  Cirsium arizonicum var. tenuisectum John C. Roos 1949-8-13 4615 San Bernardino Eastern Mojave Desert, Keystone Canyon, New York Mtns. 1768 Comment
  UCR23830  Cirsium arizonicum var. tenuisectum John C. Roos 1949-6-21 4436 San Bernardino Eastern Mojave Desert, New York Mtns, Keystone Canyon 1829 Comment
  UCR30572  Cirsium scariosum John C. Roos 1937-7-23 348 San Bernardino San Bernardino Mountains, Fish Creek, upper Santa Ana River 1982 Comment
  SD53019  Cirsium vulgare J. C. Roos 1955-8-8 6525 San Bernardino Loma Linda 320 Comment
  CLARK-A1528-3337  Clarkia dudleyana John C. Roos 1948-6-26 3892 San Bernardino City Creek Comment
  UCR18875  Clarkia heterandra John C. Roos 1947-6-14 3678 San Bernardino San Bernardino Mtns, near Crestline, behind the Crestline Bowl 1433 Comment
  CAS-BOT-BC172566  Clarkia purpurea subsp. purpurea J. C. Roos 1965-6-12 s.n. San Bernardino Igo's near Mountain Home Village in Mill Creek Canyon, San Bernardino Mtns. Comment
  CLARK-A1528-3371  Clarkia rhomboidea John C. Roos 1947-6-14 3680 San Bernardino San Bernardino Mountains 1523 Comment
  POM265643  Claytonia parviflora subsp. tenuifolia J. C. Roos 1937-6-5 1474 San Bernardino Crestline Comment
  UCR18909  Clematis lasiantha John C. Roos 1947-4-12 3437 San Bernardino San Bernardino Mtns., Mill Creek 915 Comment
  POM302504  Clematis ligusticifolia J. C. Roos 1943-8-8 2700 Riverside Hall Canyon. Comment
  POM265657  Cleome sparsifolia J. C. Roos 1937-8-4 1953 Inyo east side of Owens Lake. Comment
  RSA104821  Cleome sparsifolia J. C. Roos 1955-5-13 6358 Inyo SE end of Eureka Valley. 945 Comment
  RSA47568  Cleomella brevipes J. C. Roos, Weatherby 1949-9-3 3565 Inyo Tecopa Hot Springs 427 Comment
  UCR18948  Cleomella brevipes John C. Roos, R. Weatherby 1949-9-3 3565 Inyo Northeastern Mojave Desert, Drying alkaline meadows below Tecopa Hot Spring 427 Comment
  CLARK-A1528-2385  Cleomella plocasperma John C. Roos 1937-8-6 1960 Inyo Big Pine Comment
  CLARK-A1528-3966  Cneoridium dumosum John C. Roos 1937-6-16 2387 San Diego Torrey Pines Ridge Comment
  RSA92552  Cneoridium dumosum J. C. Roos 1954-4-10 6061 San Diego San Pasqual 152 Comment
  CLARK-A1528-2204  Coldenia nuttallii John C. Roos 1952-5-17 5679 San Bernardino Mojave Desert 914 Comment
  CLARK-A1528-2203  Coldenia nuttallii John C. Roos 1937-8-6 1961 Inyo Big Pine Comment
  CLARK-A1528-2208  Coldenia plicata John C. Roos 1965-6-23 Riverside Comment
  UCR25395  Coleogyne ramosissima John C. Roos 1937-4-23 784 San Bernardino Mojave Desert, 20 mi. west of Twentynine Palms (near Yucca Valley) 915 Comment
  CLARK-A1528-1229  Collinsia childii John C. Roos 1937-6-5 1514 San Bernardino Crestline 1523 Comment
  RSA450061  Collinsia childii J. C. Roos, Lucille Roos 1953-6-18 5922 San Bernardino Cedarpines Park. 1524 Comment
  UCSB42127  Collinsia heterophylla Roos, John 1965-6-12 San Bernardino Igo's near Mountain Home Village; in Mill Creek Canyon; San Bernardino Mtns Comment
  UCR24481  Collinsia heterophylla var. austromontana John C. Roos 1956-5-26 6579 San Bernardino San Bernardino Mtns., Wildwood Cyn, near Yucaipa Comment
  UCR18912  Colubrina californica John C. Roos 1960-4-8 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mts.; canyon 2.5 mi. SE of Desert Center Comment
  UCSB72193  Comastoma tenellum Roos, John 1959-8-23 Mono Cottonwood Creek 2895 Comment
  RSA45520  Condalia globosa var. pubescens J. C. Roos 1949-4-8 4184 Imperial near Midway Well. Comment
  CLARK-A1528-1780  Conyza coulteri John C. Roos 1965-10-10 San Diego Otay Lake Comment
  POM261396  Cordylanthus eremicus subsp. eremicus J. C. Roos 1941-8-17 76 Inyo Panamint Mountains; Wildrose Canyon at Kilns Comment
  CLARK-A1528-1236  Cordylanthus filifolius John C. Roos 1940-9-1 231 San Bernardino Cajon Pass 761 Comment
  CLARK-A1528-4198  Cordylanthus helleri John C. Roos 1958-8-30 Inyo Inyo Mountains Comment
  UC1010203  Cordylanthus kingii subsp. helleri John and Lucille Roos 1952-7-25 5818 Inyo between Westgaard Pass and Reed Flat; White Mountains 2438 Comment
  UC1234837  Cordylanthus kingii subsp. helleri J. C. and A. R. Roos 1955-8-25 6548 Inyo e base Waucoba Mt.; Inyo Mts., Soldier Flat 2164 Comment
  RSA155752  Cordylanthus kingii subsp. helleri J. C. Roos 1955-7-20 6475 Inyo Last Chance Mountains 2 miles east of Willow Spring, at boundary marker # 80. 2134 Comment
  CLARK-A1528-4199  Cordylanthus nevinii John C. Roos 1942-8-22 1752 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4200  Cordylanthus nevinii John C. Roos 1965-9-11 San Bernardino San Bernardino Mountains Comment
  RSA450160  Cordylanthus nevinii J. C. Roos 1965-9-11 s.n. San Bernardino Mill Creek. Comment
  CLARK-A1528-5735  Cordylanthus ramosus subsp. eremicus John C. Roos 1941-8-17 76 Inyo Panamint Mountains Comment
  UCSB46757  Cordylanthus rigidus subsp. setiger Roos, John 1965-8-18 Riverside Thomas Valley, San Jacinto Mtns. Comment
  RSA0030791  Cordylanthus rigidus subsp. setiger J. C. Roos 1965-8-18 s.n. Riverside Thomas Valley, San Jacinto Mtns. Comment
  CAS-BOT-BC238206  Cordylanthus tecopensis John C. Roos 1954-7-18 6203 San Bernardino Saratoga Springs, Mohave [Mojave] Desert 60 Comment
  CLARK-A1528-1232  Cordylanthus tecopensis John C. Roos, Alfred R. Roos 1950-8-7 4929 Inyo Tecopa Hot Springs 426 Comment
  CLARK-A1528-5173  Cordylanthus tecopensis John C. Roos, Lucille Roos 1954-9-15 6243 Inyo 426 Comment
  CLARK-A1528-5174  Cordylanthus tecopensis John C. Roos 1953-10-31 6033 Inyo Amargosa River 441 Comment
  GH365880  Cordylanthus tecopensis J. C. Roos & L. Roos 1954-9-15 6243 Unknown between Tecopa and Tecopa Hot Springs. 426 Comment
  CLARK-A1528-5629  Coreopsis atkinsoniana John C. Roos 1955-7-2 6473 San Diego Escondido 182 Comment
  CLARK-A1528-1785  Corethrogyne filaginifolia John C. Roos 1942-9-12 1719 Los Angeles Westwood Comment
  UCR27546  Cornus sericea subsp. sericea John C. Roos 1963-1 s.n. San Bernardino San Bernardino Mtns., Green Canyon 2530 Comment
  CLARK-A1528-1015  Coronopus didymus John C. Roos 1947-6-9 3651 San Bernardino San Bernardino 320 Comment
  UCR23727  Cotula australis John C. Roos 1942-2-28 1004 Los Angeles San Gabriel Valley, Pomona, 737 East Phillips St. 250 Comment
  CLARK-A1528-3988  Cowania mexicana John C. Roos 1950-8-4 San Bernardino Clark Mountain Range Comment
  CLARK-A1528-3989  Cowania mexicana var. stansburyana John C. Roos 1941-8-17 71 Inyo Panamint Mountains Comment
  SD52868  Cowania mexicana var. stansburyana J. C. Roos 1955-7-21 6492 Inyo 1.0 mile south of Willlow Spring, Last Chance Mountains. 2073 Comment
  CLARK-A1528-2618  Crassula erecta John C. Roos 1952-2-29 5373 Riverside Riverside 457 Comment
  CLARK-A1528-2619  Crassula erecta John C. Roos 1947-2-20 3275 San Bernardino Loma Linda Hills Comment
  RSA47446  Crepis acuminata J. C. Roos 1949-7-16 4551 San Bernardino Moonridge Ski Area, Bear Valley. 2226 Comment
  RSA71745  Crepis intermedia J. C. Roos 1952-7-27 5832 Inyo Southeast rim Reed Flat, White Mountains. 3140 Comment
  UC1010205  Crepis intermedia John and Lucille Roos 1952-7-27 5832 Inyo Reed Flat White Mts. (se rim) 3139 Comment
  CLARK-A1528-5222  Crepis nana John C. Roos 1947-7-13 2895 Inyo Panamint Mountains 3352 Comment
  UCR20312  Crepis nana John C. Roos 1947-7-13 2895 Inyo Northern Mojave /Great Basin Desert, Panamint Mountains, Death Valley National Monument [Park], Telescope Peak 3354 Comment
  RSA40586  Crepis nana subsp. ramosa J. C. Roos 1947-7-13 2895 Inyo Death Valley National Monument, Telescope Peak. 3354 Comment
  UCR18878  Cressa truxillensis John C. Roos 1952-5-21 5703 Riverside Perris-Aguanga Basin region, San Jacinto River bottomland 1.5 mi. SE of Perris. 427 Comment
  RSA92578  Cressa truxillensis J. C. Roos 1952-5-21 5703 Riverside San Jacinto River bottomland 1.5 miles southeast of Perris 426 Comment
  CLARK-A1528-2691  Croton californicus John C. Roos 1965-6-27 San Bernardino Loma Linda 1000+ ft Comment
  CLARK-A1528-432  Croton californicus John C. Roos 1951-9-25 5297 Riverside Santa Ana River 259 Comment
  UCR23593  Croton setiger John C. Roos 1938-8-19 2747 San Bernardino San Bernardino Valley, Loma Linda 305 Comment
  UCR24005  Crypsis schoenoides John C. Roos 1969-11-22 s.n. Riverside San Jacinto Valley, east of Moreno. Quail Lake at the S end of Jack Rabbit Trail. 427 Comment
  POM301602  Cryptantha cinerea var. abortiva J. C. Roos 1937-7-31 1839 San Bernardino Pine flats E of mouth of Lost Creek, San Bernardino Mts 1982 Comment
  UCR18800  Cryptantha confertiflora John C. Roos 1947-4-20 3576 Inyo Northern Mojave Desert, Panamint Mountains near Telescope Peak, Wildrose Canyon 1585 Comment
  UCR23590  Cryptantha confertiflora John C. Roos 1955-5-15 6377 Inyo Last Chance Mtns, 1 mi east of Willow Spring 1951 Comment
  CLARK-A1528-2212  Cryptantha costata John C. Roos 1949-4-7 4158 Imperial Algodones Dunes Comment
  CLARK-A1528-4998  Cryptantha flavoculata John C. Roos 1947-4-20 3577 Inyo Wildrose Canyon 1584 Comment
  UCR25964  Cryptantha gracilis John C. Roos 1949-6-24 3559 San Bernardino Eastern Mojave Desert, summit of Clark Mountain 2409 Comment
  UCR31667  Cryptantha gracilis John C. Roos 1949-6-19 4397 San Bernardino Eastern Mojave Desert, SE base of Clark Mountain 1921 Comment
  UCR25423  Cryptantha hoffmannii John C. Roos, L. Roos 1954-6-29 6188 Inyo Northern Mojave Desert, Inyo Mountains, The Narrows, Marble Canyon 2195 Comment
  UCR30479  Cryptantha hoffmannii John C. Roos, A. R. Roos 1953-8-11 6005 Inyo Northern Mojave Desert, Canyon 3 mi east of Badger Flat, Inyo Mtns. 3110 Comment
  RSA450444  Cryptantha intermedia J. C. Roos 1950-4-22 4746 Riverside Pigeon Pass Comment
  UCR23444  Cryptantha micrantha var. lepida John C. Roos 1937-4-18 s.n. San Bernardino San Bernardino Valley, Santa Ana River near Redlands 427 Comment
  CLARK-A1528-2228  Cryptantha muricata John C. Roos 1948-6-13 3879 San Bernardino San Gabriel Mountains 1219 Comment
Read comments
Mar 20 2014
  UCR25967  Cryptantha muricata John C. Roos 1948-6-13 3879 San Bernardino San Gabriel Mtns., Lytle Creek, along roadside 1220 Comment
  RSA0079568  Cryptantha muricata var. jonesii J. C. Roos 1950-4-15 4732 Riverside The summit of Reche Canyon. 793 Comment
  CLARK-A1528-2229  Cryptantha nevadensis John C. Roos 1966-3-20 Riverside Comment
  CLARK-A1528-7857  Cryptantha nevadensis John C. Roos 1949-4-11 4246 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-2232  Cryptantha racemosa John C. Roos 1948-5-1 3815 Riverside Whitewater 609 Comment
  CLARK-A1528-2236  Cryptantha utahensis John C. Roos 1948-5-1 3816 Riverside Whitewater 548 Comment
  RSA71734  Cryptantha virginensis J. C. Roos, L. Roos 1952-7-28 5849 Inyo White Mountains:Wyman Canyon 2744 Comment
  POM261394  Cryptogramma acrostichoides J. C. Roos 1941-6-5 113 San Bernardino San Bernardino Mountains: Above Dollar Lake. 2896 Comment
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Mar 4 2008
  UCR24181  Cucurbita foetidissima John C. Roos 1952-6-13 5764 San Bernardino San Bernardino Valley, Reche Canyon 457 Comment
  UC1010326  Cuniculotinus gramineus J. C. and A. R. Roos 1953-8-9 5945 Inyo Inyo Mts., Tamarack Canyon 2682 Comment
  CLARK-A1528-2663  Cupressus macnabiana John C. Roos 1938-11-19 323 Napa Pope Valley Comment
  UCR23689  Cuscuta indecora John C. Roos 1946-10-5 3109 San Bernardino San Bernardino Mtns./Southern Mojave Desert, The Pipes, a desert slope on the E side of the mountains, north of Yucca Valley. At mouth of canyon 1357 Comment
  POM265706  Cycloloma atriplicifolium J. C. Roos 1937-6-16 1230 San Diego San Pasqual Valley. Comment
  UCR24273  Cycloloma atriplicifolium John C. Roos 1937-9-29 s.n. Los Angeles San Gabriel Valley, near the San Gabriel River, in El Monte 91 Comment
  SBBG54103  Cyclospermum leptophyllum J. C. Roos, L. Roos 1953-5-9 5917 Riverside Fairmount Park, Riverside 259 Comment
  UCR26275  Cymopterus aboriginum John C. Roos, A. R. Roos 1954-6-12 6131 Inyo Northern Mojave Desert, Panamint Mountains, upper Wildrose Canyon, near Wildrose Peak 2439 Comment
  RSA40575  Cymopterus aboriginum J. C. Roos 1947-4-20 3522 Inyo Wildrose Canyon, Panamint Mountains. 1585 Comment
  UC1010175  Cymopterus aboriginum J. C. and A. R. Roos 1953-8-11 5983 Inyo 1 mi e of Badger Flat and Blue Bell Mine (Inyo Mountains); Inyo Mountains 2834 Comment
  CLARK-A1528-1434  Cymopterus cinerarius John C. Roos 1953-8-11 5983 Inyo Inyo Mountains 2834 Comment
  RSA71746  Cymopterus cinerarius J. C. Roos, Lucille Roos 1952-7-27 5831 Inyo Ridge at S. E. rim Reed Flat, White Mountains. 3171 Comment
  UC1236247  Cymopterus gilmanii John C. Roos 1955-5-13 6343 Inyo e and ne of Eureka Valley (w base of Last Chance Mountains); Last Chance Mountains 1219 Comment
  UCR23394  Cymopterus gilmanii John C. Roos, P. A. Munz 1955-4-8 6303 Inyo Northern Mojave Desert, Last Chance Mtns, east of Eureka Valley sand dunes 1220 Comment
  CLARK-A1528-51  Cynodon dactylon John C. Roos 1951-10-2 5311 San Bernardino Loma Linda 320 Comment
  UCR30615  Cynodon dactylon John C. Roos, A. R. Roos 1950-8-7 s.n. San Bernardino Northeastern Mojave Desert, Beck Spring, Kingston Mountains 1372 Comment
  POM263117  Dactylis glomerata J. C. Roos 1938-6-4 473 San Bernardino Loma Linda, San Bernardino Valley. Comment
  UCR25610  Dactylis glomerata John C. Roos 1947-5-27 3650 San Bernardino San Bernardino Valley, Loma Linda, residential area 366 Comment
  CLARK-A1528-4900  Dalea fremontii var. saundersii John C. Roos 1937-5-30 486 San Bernardino Kramer Hills Comment
  UCR24509  Dalea mollissima John C. Roos 1949-3-19 4106 Riverside Sonoran (Colorado) Desert, near Dos Palmas Spring on the E side of the Salton Sea in the vicinity of Salt Creek -30 Comment
  CLARK-A1528-2771  Dalea polyadenia John C. Roos 1954-6-28 6178 Inyo Eureka Valley 914 Comment
  CLARK-A1528-1242  Danthonia californica John C. Roos 1937-7-29 414 San Bernardino San Bernardino Mountains Comment
  UCR18885  Datisca glomerata John C. Roos 1967-9-23 s.n. San Bernardino San Bernardino Mtns, Holcomb Creek 1585 Comment
  CLARK-A1528-5134  Datisca glomerata John C. Roos 1967-9-23 San Bernardino San Bernardino Mountains 1584 Comment
  CLARK-A1528-1204  Datura stramonium John C. Roos 1939-9-9 San Bernardino Mentone Comment
  CAS-BOT-BC130906  Deinandra arida J. C. Roos 1969-5-10 s.n. Kern Red Rock Canyon Comment
  UCSB37786  Deinandra fasciculata Roos, John 1965-6-19 Riverside Sky Line Drive, south of Corona, Santa Ana Mtns. Comment
  RSA444458  Delphinium cardinale J. C. Roos 1965-6-19 s.n. Riverside Hagador Canyon: Skyline Drive south of Corona. Comment
Read comments
May 21 2011
  CLARK-A1528-5721  Delphinium decorum John C. Roos 1940-5-11 849 San Bernardino San Bernardino Mountains 1219 Comment
  CLARK-A1528-3857  Delphinium glaucum John C. Roos, Lucille Roos 1952-7-30 5861 Mono White Mountains 2743 Comment
  UCR27419  Delphinium glaucum John C. Roos 1965-8-9 s.n. Inyo Eastern Sierra Nevada Mtns, Onion Valley 2744 Comment
  CAS-BOT-BC192561  Deschampsia cespitosa subsp. holciformis J. C. Roos 1957-7-2 6638 Mendocino Point Arena Lighthouse Comment
  CLARK-A1528-4581  Deschampsia danthonioides John C. Roos 1937-7-27 451 San Bernardino San Bernardino Mountains Comment
  RSA44906  Descurainia incana subsp. incisa J. C. Roos 1947-8-9 3737 San Bernardino Bluff Lake, San Bernardino Mts. 2287 Comment
  RSA658696  Descurainia sophia A. R. Roos 1954-4-12 6066 Los Angeles 5001 Gaviota Ave., Encino. 213 Comment
  UC1494278  Dichanthelium acuminatum subsp. fasciculatum John and Lucille Roos 1954-11-24 6262 Inyo mouth Beveridge Canyon (e base Inyo Mts., Saline Valley); e base Inyo Mountains, Saline Valley, mouth Beveridge Canyon 609 Comment
  RSA158108  Dichanthelium acuminatum var. fasciculatum J. C. Roos 1955-7-23 6511 Inyo Mouth of Beveridge Canyon, east base Inyo Mts., Saline Valley 610 Comment
Read comments
Mar 14 2008
  CAS-BOT-BC292156  Dicoria canescens John Roos; Lucille Roos 1954-6-28 6173 Inyo At SE end Eureka Valley 929 Comment
  UCR23772  Dicoria canescens subsp. clarkiae John C. Roos, L. Roos 1954-11-24 6266 Inyo Northern Mojave Desert, SE end of Eureka Valley 930 Comment
  CLARK-A1528-1800  Dicoria canescens subsp. clarkiae John C. Roos, Lucille Roos 1954-6-28 6173 Inyo Eureka Valley 929 Comment
  CLARK-A1528-5472  Dicoria canescens subsp. clarkiae John C. Roos, Philip A. Munz 1954-9-18 20157 Inyo Eureka Valley 929 Comment
  RSA104839  Dicoria clarkiae J. C. Roos 1955-5-13 6359 Inyo SE end of Eureka Valley. 945 Comment
  UCSB37827  Dieteria canescens Roos, John 1966-8-13 San Bernardino Fish Creek, San Bernardino Mtns. 2316 Comment
  UCR19367  Digitaria ischaemum John C. Roos 1965-9-28 s.n. Riverside San Jacinto Valley, San Jacinto Comment
  RSA69813  Digitaria ischaemum J. C. Roos 1951-9-25 5276 Riverside Fairmount Park 259 Comment
  CLARK-A1528-4587  Digitaria sanguinalis John C. Roos 1965-7-5 San Bernardino Loma Linda 304 Comment
  OBI30463  Diplacus bigelovii J. C. Roos 1967-8-6 s.n. Inyo Mazourka Cyn, Inyo Mts Comment
  CAS-BOT-BC152926  Diplacus brevipes J. C. Roos 1965-6-6 s.n. San Bernardino Mill Creek, near Fallsvale, San Bernardino Mtns. Comment
  POM302498  Diplotaxis muralis J. C. Roos 1943-4-11 2603 San Bernardino County Hospital. Comment
  LA102187  Distichlis spicata John C. Roos; 1949-5-14 4309 San Bernardino Lucerne Valley, Rabbit Springs 883 Comment
  CLARK-A1528-4592  Distichlis stricta var. laxa John C. Roos 1952-7-2 5804 Riverside Riverside 259 Comment
  RSA52806  Dodecahema leptoceras J. C. Roos, L. Roos 1950-6-3 4822 San Bernardino Cajon Canyon, 1 mile below 'Blue Cut' 762 Comment
  CLARK-A1528-1317  Dodecatheon clevelandii John C. Roos 1946-12-28 3195 Riverside Reche Canyon 0 Comment
  CLARK-A1528-2311  Draba corrugata John C. Roos 1936-7-30 951 San Bernardino San Bernardino Mountains 3322 Comment
  UCR25945  Draba corrugata John C. Roos 1946-9-4 2955 San Bernardino San Bernardino Mtns., San Gorgonio Peak 3500 Comment
  UCR19087  Draba cuneifolia var. integrifolia John C. Roos 1952-3-19 5402 Riverside Peninsular Range, Box Springs Mountains [east edge of Riverside] 457 Comment
  POM265667  Draba lemmonii J. C. Roos 1937-8-8 1020 Inyo Steep E slope of Whitney Pass, Sierra Nevada. 3659 Comment
  UCR23631  Draba verna var. aestivalis John C. Roos 1939-2-21 299 Napa North Coast Range, Pacific Union College, Angwin 549 Comment
  CLARK-A1528-5133  Drosera rotundifolia John C. Roos 1957-7-1 6624 Mendocino Little River Comment
  CLARK-A1528-1491  Dryopteris arguta John C. Roos 1937-3-27 1326 Santa Barbara Los Olivos Comment
  POM265681  Dudleya abramsii J. C. Roos 1937-6-14 1787 San Diego near Descanso Junction Comment
  UCR25151  Dudleya cymosa John C. Roos 1965-6-28 s.n. San Bernardino San Bernardino Mtns., Mill Creek Canyon at Igo's [a store at Mountain Home Village -S.D. White 2001] 1159 Comment
  CLARK-A1528-2622  Dudleya lanceolata John C. Roos 1937-5-21 2338 Orange Santa Ana Comment
  CLARK-A1528-4866  Dudleya lanceolata John C. Roos 1937-6-13 1789 San Diego Imperial Beach Comment
  CLARK-A1528-4925  Dudleya saxosa John C. Roos 1937-5-29 1790 San Bernardino San Bernardino Mountains Comment
  UCD98830  Dysphania pumilio A. R. Roos 1937-7-14 s.n. San Bernardino Santa Ana River, near Waterman Avenue. Comment
  CAS-BOT-BC291045  Dyssodia papposa John Roos; Lucille Roos 1952-5-1 5056 a San Bernardino Corner of Central and Anderson, Loma Linda 335 Comment
  RSA66169  Dyssodia papposa J. C. Roos 1951-5-31 5056 San Bernardino Loma Linda, corner of Central & Anderson. 335 Comment
  RSA444678  Eclipta prostrata J. C. Roos 1965-7-5 s.n. Riverside Thermal Airport. Comment
  POM265811  Elatine californica J. C. Roos 1937-7-27 1673 San Bernardino Boulder Bay, Bear Lake, San Bernardino Mts. Comment
  CLARK-A1528-4937  Elatine californica John C. Roos 1937-7-27 1673 San Bernardino San Bernardino Mountains Comment
  UCSB45522  Elatine chilensis Roos, John 1965-7-17 San Bernardino Dry Lake; San Bernardino Mtns. 2743 Comment
  UCR24046  Eleusine indica John C. Roos 1942-10-1 1735 Los Angeles Los Angeles, North Boyle and Bridge Street Comment
  POM266271  Elymus X gouldii J. C. Roos 1937-7-2 1926 Santa Barbara Los Olivos. Comment
  RSA69833  Elymus X gouldii J. C. Roos, L. Roos 1951-10-24 5344 Riverside Fairmount Park. 259 Comment
  CAS-BOT-BC203836  Elymus X hansenii J. C. Roos 1952-6-13 5765 Riverside Reche Canyon 457 Comment
  RSA79478  Elymus X hansenii J. C. Roos, A. R. Roos 1952-8-13 6016 Inyo Along crest of Inyo Mountains, 3 miles east of Badger Flat. Alt. 10600 ft. 3232 Comment
  RSA450648  Elymus elymoides J. C. Roos 1965-6-16 s.n. San Bernardino North slope of Cajon Pass [San Gabriel Mountains]. Comment
  POM265759  Elymus glaucus J. C. Roos 1937-5-10 2076 Orange San Juan Capistrano. Comment
  UCR24023  Elymus glaucus subsp. jepsonii John C. Roos 1942-6-20 993 Riverside Peninsular Range; San Jacinto Mtns, Dark Canyon Camp, North Fork San Jacinto River 1829 Comment
  UCR24048  Elymus glaucus subsp. jepsonii John C. Roos 1940-7-18 1871 San Bernardino San Bernardino Mtns., Green Valley Comment
  UCR23882  Elymus stebbinsii John C. Roos 1940-7-30 1573 San Bernardino San Bernardino Mtns., Big Bear Valley, Pine Knot Camp [vicinity of Pine Knot Blvd., city of Big Bear Lake] 2073 Comment
  UC1010200  Elymus trachycaulus John and Lucille Roos 1951-8-12 5184 Inyo Reed Flat White Mts. 3169 Comment
  CLARK-A1528-4607  Elymus triticoides John C. Roos 1951-10-24 5344 Riverside Riverside 259 Comment
  UCR24090  Endolepis covillei John C. Roos 1940-6-8 1891 Kern San Joaquin Valley, Bakersfield Comment
  RSA85161  Enneapogon desvauxii J. C. Roos 1950-8-5 4899 San Bernardino About 1 mile SW of Coliseum Mine, north side of Clark Mountains 1646 Comment
  UC1023389  Enneapogon desvauxii J. C. Roos 1950-9-3 4970 San Bernardino s side Clark Mt.; Mojave Desert 1828 Comment
  CLARK-A1528-2673  Ephedra viridis John C. Roos 1949-4-10 4224 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-2674  Ephedra viridis John C. Roos 1950-8-4 San Bernardino Clark Mountain Comment
  CLARK-A1528-3295  Epilobium adenocaulon John C. Roos 1937-7-31 966 San Bernardino San Bernardino 304 Comment
  CLARK-A1528-3341  Epilobium adenocaulon var. holosericeum John C. Roos 1937-7-31 967 San Bernardino San Bernardino 304 Comment
  UCR23520  Epilobium campestre John C. Roos 1952-6-18 5779 Riverside Moreno Valley, Edgemont [now part of city of Moreno Valley] 457 Comment
  RSA48879  Epilobium canum subsp. canum J. C. Roos 1949-9-21 4663 Riverside Reche Canyon, 2.7 miles south of Hollow Hill Dairy 457 Comment
  UCR26278  Epilobium ciliatum John C. Roos 1952-6-25 5795 Riverside Thickets at W end of Fairmont Park, Riverside 260 Comment
  UCR23468  Epilobium densiflorum John C. Roos 1965-9-15 s.n. San Bernardino Mojave Desert, Victorville Comment
  UCR23534  Epilobium oregonense John C. Roos 1937-8-18 2528 Riverside San Jacinto Mtns, Round Valley 2744 Comment
  UCSB42150  Epilobium torreyi Roos, John 1965-9-15 San Bernardino Victorville Comment
  CLARK-A1528-3377  Epipactis gigantea John C. Roos 1941-8-2 87 Riverside San Jacinto Mountains 2133 Comment
  CLARK-A1528-3380  Epipactis gigantea John C. Roos 1948-4-24 3793 Riverside Whitewater 609 Comment
  CLARK-A1528-7851  Epipactis gigantea John C. Roos 1948-5-15 3838 Riverside Eagle Mountains Comment
  POM266631  Epipactis gigantea J. C. Roos 1942-5-2 1129 Riverside Cottonwood Springs, northern Colorado Desert. Comment
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Oct 9 2010
  UCR19157  Epipactis gigantea John C. Roos 1948-5-29 3870 Riverside San Bernardino Mtns., Whitewater Canyon 856 Comment
  CLARK-A1528-4627  Eragrostis barrelieri John C. Roos 1965-9-22 San Bernardino Barstow Comment
  CAS-BOT-BC204486  Eragrostis cilianensis J. C. Roos 1965-7-7 s.n. Riverside San Jacinto Comment
  CLARK-A1528-4630  Eragrostis cilianensis Alfred R. Roos 1937-8-4 10879 Inyo Lone Pine Comment
  CAS-BOT-BC204534  Eragrostis curvula J. C. Roos 1965-9-16 s.n. San Bernardino Lakeview Comment
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Sep 19 2018
  RSA450451  Eragrostis curvula J. C. Roos 1965-10-10 s.n. San Diego On the dry roadside of hwy 395, 0.1 miles south of the San Diego/Riverside county line. Comment
  UCR23991  Eragrostis curvula var. curvula John C. Roos 1965-9-16 s.n. Riverside Lakeview Comment
  CLARK-A1528-59  Eragrostis diffusa John C. Roos 1951-9-18 5218 San Bernardino Loma Linda 335 Comment
  CLARK-A1528-7800  Eragrostis mexicana John C. Roos 1950-5-16 4811 San Bernardino Highland 457 Comment
  UCSB51371  Eragrostis mexicana Roos, John 1937-11-25 San Bernardino Highland Comment
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May 21 2011
  UCD63881  Eragrostis mexicana subsp. virescens John and Lucille Roos 1951-8-12 5194 Inyo Big Pine, along Big Pine Creek. 1219 Comment
  UCR25239  Eragrostis mexicana subsp. virescens Alfred R. Roos 1947-12-2 s.n. San Bernardino San Bernardino Valley/San Bernardino Mtns. Foothills, Highland, east of San Bernardino 457 Comment
  UCR32868  Eragrostis mexicana subsp. virescens John C. Roos 1951-9-19 5220 San Bernardino San Bernardino Valley, Irrigated orchard on West Barton Ave. in Loma Linda 335 Comment
  UCR32866  Eragrostis minor John C. Roos, A. R. Roos 1950-8-7 4921 San Bernardino Northeastern Mojave Desert, Beck Spring, Kingston Mountains 1372 Comment
  POM262906  Eragrostis pectinacea J. C. Roos 1937-11-25 435 San Bernardino Patton, in orchard. Comment
  RSA314966  Eragrostis pectinacea J. C. Roos 1939-9-16 s.n. San Bernardino Mentone Comment
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Aug 10 2007
  CAS-BOT-BC284148  Eragrostis pectinacea var. pectinacea J. C. Roos 1965-7-5 s.n. San Bernardino Loma Linda 304 Comment
  HSC84423  Eragrostis pectinacea var. pectinacea J. C. Roos 1936-10-9 1526 San Bernardino Victorville 823 Comment
  UCR25242  Eragrostis pectinacea var. pectinacea Alfred R. Roos 1936-9-2 10386 San Bernardino San Bernardino Mtns., Seven Oaks 1707 Comment
  CLARK-A1528-3224  Eremalche rotundifolia John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  SD52945  Eremothera boothii subsp. intermedia J. C. Roos 1955-6-17 9396 Inyo 2.0 miles northeast of Willow Spring, Last Chance Mountains. 2012 Comment
  UC1234852  Eremothera boothii subsp. intermedia J. C. Roos 1955-6-17 6396 Inyo 2 mi ne Willow Spring; Last Chance Mountains 2011 Comment
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Nov 4 2011
  CAS-BOT-BC514443  Eriastrum eremicum subsp. eremicum John Roos; Lucille Roos 1947-7-15 2825 Inyo Darwin Mesa 1524 Comment
  RSA0121587  Eriastrum sapphirinum subsp. dasyanthum J. C. Roos 1965-6-13 s.n. Riverside San Jacinto Valley, Valle Vista (east of Hemet). Comment
  RSA0123322  Eriastrum sapphirinum subsp. sapphirinum J. C. Roos 1936-8-15 575 San Bernardino Barton Flats. Comment
  CAS-BOT-BC515215  Eriastrum wilcoxii J. C. Roos 1965-7-11 s.n. Inyo Wildrose Canyon at kilns, Panamint Mtns. Comment
  OBI30456  Eriastrum wilcoxii J. C. Roos 1965-7-11 Inyo Wild rose Canyon at kills, Panamint Mtns. Comment
  GH387225  Ericameria albida J. C. Roos & L. Roos 1954-11-23 6260 Unknown 1.4 miles south of Lower Warm Spring, Saline Valley 381 Comment
  GH387226  Ericameria albida J. C. Roos & A. R. Roos 1954-8-15 6224 Unknown Lower Warm Spring, Saline Valley 426 Comment
  GH387228  Ericameria albida J. C. Roos & L. Roos 1954-9-14 6232 Unknown Amargosa River bottomland 3 miles south of Shoshone 432 Comment
  OBI40198  Ericameria arborescens John C. Roos 1948-8-27 3966 Santa Cruz Santa Cruz Mtns. Comment
  UC1506370  Ericameria arborescens J. C. Roos 1948-8-27 3966 Santa Cruz on slope e Big Basin; Santa Cruz Mountains Comment
  UCR31646  Ericameria bloomeri John C. Roos 1948-9-7 3990 Mono Eastern Sierra Nevada Mtns., Crestview 2326 Comment
  SEINET226224  Ericameria bloomeri J. C. Roos 1948-9-7 4012 Tuolumne Yosemite National Park ; Near Tuolumne Grove Big Trees 1219 Comment
  UCR23944  Ericameria cooperi John C. Roos 1949-5-14 4292 San Bernardino Mojave Desert/San Bernardino Mtns, 4 mi. west of Hesperia 1052 Comment
  UCR26141  Ericameria cooperi John C. Roos 1949-5-29 4371 San Bernardino Eastern Mojave Desert, Coloseum Mine, Clark Mountain 1707 Comment
  RSA48684  Ericameria cuneata var. spathulata J. C. Roos, L. Roos 1949-8-13 4609 San Bernardino Copper Queen Mine, Keystone Canyon, New York Mtns. 1829 Comment
  UCR23897  Ericameria ericoides John C. Roos 1942-10-10 1723 Los Angeles UCLA, Los Angeles Comment
  UCR26086  Ericameria ericoides John C. Roos 1948-8-27 3964 Monterey Central Coast, Santa Lucia Mtns, coast between Carmel and Big Sur 91 Comment
  UC1494271  Ericameria gilmanii J. C. Roos 1947-9-19 2798 Inyo rocky ridge se Telescope Peak; Panamint Mtns. 3352 Comment
  CAS-BOT-BC292385  Ericameria nana J. C. Roos; A. R. Roos 1955-8-24 6538 Inyo Summit ridge of Last Chance Mts, 3.5 miles S of Willow Spring 2438 Comment
  POM266285  Ericameria palmeri var. pachylepis J. C. Roos 1937-11-2 2447 Riverside Hills N of Pigeon Pass, Northwestern Riverside County. Comment
  CAS-BOT-BC174359  Ericameria parishii var. parishii J. C. Roos 1965-10-2 s.n. San Bernardino Camp Angelus, San Bernardino Mtns. Comment
  POM266283  Ericameria parishii var. parishii J. C. Roos 1937-10-30 2261 Los Angeles Lytle Creek, east end of San Gabriel Mts. Comment
  UC1234815  Ericameria parishii var. parishii J. C. Roos 1955-9-3 6571 San Bernardino 2 mi w Loma Linda; Summit Little Pigeon Pass 335 Comment
  UC1010181  Ericameria parryi var. aspera John and Lucille Roos 1951-8-8 5114 Inyo se rim Reed Flat; White Mts., Reed Flat 3078 Comment
  UCR23782  Ericameria parryi var. aspera John C. Roos, Alfred R. Roos 1955-8-26 6551 Inyo Inyo Mountains, [Inyo National Forest], main ridge between Squaw Peak and Waucoba Mountain 2957 Comment
  UCSB37812  Ericameria teretifolia Roos, John 1965-9-18 Inyo Wild Rose Canyon, Panamint Mtns. Comment
  UC1236227  Erigeron aphanactis var. aphanactis John C. Roos 1955-5-15 6380 Inyo Willow Creek Last Chance Mts., Willow Creek 1584 Comment
  CLARK-A1528-2166  Erigeron aphanactis var. congestus John C. Roos 1946-9-4 San Bernardino San Bernardino Mountains 3489 Comment
  CAS-BOT-BC293578  Erigeron argentatus John Roos; Lucille Roos 1952-7-25 5817 Inyo Between Westgaard [Westgard] Pass and Reed Flat, White Mts. 2438 Comment
  UCSB42153  Erigeron breweri Roos, John 1965-6-26 San Bernardino Upper Santa Ana Basin near Fish Creek, San Bernardino Mtns. Comment
  RSA47464  Erigeron breweri var. bisanctus J. C. Roos 1949-7-16 4560 San Bernardino Moonridge, Bear Valley, San Bernardino Mts. 2256 Comment
  RSA155686  Erigeron breweri var. porphyreticus J. C. Roos 1955-6-20 6456 Inyo 2 miles NE of Willow Spring. 1982 Comment
  RSA47565  Erigeron breweri var. porphyreticus J. C. Roos 1949-6-27 4509 San Bernardino Kingston Mtns, on high ridge. 2134 Comment
  UC809658  Erigeron breweri var. porphyreticus John and Lucille Roos 1949-6-27 4508 San Bernardino N. side Kingston Mts.; ne San Bernardino Co. 1828 Comment
  UCR30560  Erigeron breweri var. porphyreticus John C. Roos 1947-6-21 3691 San Bernardino San Bernardino Mtns, Fawnskin, Bear Valley Comment
  CAS-BOT-BC294931  Erigeron clokeyi J. C. Roos; A. R. Roos 1953-8-9 5953 Inyo Near head of Tamarack Canyon, Inyo Mts. 3048 Comment
  UCR23763  Erigeron clokeyi John C. Roos 1955-7-21 6482 Inyo Northeastern Mojave Desert, North face of Whitetop [= Last Chance] Peak on the summit of Last Chance Mtns. 2500 Comment
  UCR26158  Erigeron clokeyi John C. Roos 1947-7-11 2905 Inyo Northern Mojave Desert, Panamint Mtns, Mahogany Flats 2470 Comment
  CLARK-A1528-4883  Erigeron divergens John C. Roos 1937-7-20 1176 San Bernardino San Bernardino Mountains Comment
  RSA450423  Erigeron divergens J. C. Roos 1965-6-26 s.n. San Bernardino San Bernardino Mountains probably near Barton Flats. Comment
  RSA450425  Erigeron divergens J. C. Roos 1965-7-18 s.n. San Bernardino Along Bear Valley, San Bernardino Mtns. Comment
  RSA44886  Erigeron foliosus var. hartwegii J. C. Roos 1948-9-1 3950 Siskiyou Summit of pass SW of Etna Comment
  CLARK-A1528-1825  Erigeron glaucus John C. Roos, Lucille Roos 1957-7-1 6631 Mendocino Albion 6 Comment
  UCR30563  Erigeron parishii John C. Roos 1947-6-21 3695 San Bernardino San Bernardino Mtns, Bottom of the canyon above Cushenbury Springs 1372 Comment
  CLARK-A1528-1831  Erigeron uncialis John C. Roos 1949-5-28 4361 San Bernardino Clark Mountain 1920 Comment
  UCR19186  Erigeron uncialis John C. Roos 1954-6-26 6160 Inyo Inyo Mountains, Mazourka Canyon, near SE end of Badger Flats 2622 Comment
  CLARK-A1528-4621  Eriochloa acuminata John C. Roos 1950-9-9 4985 San Bernardino San Bernardino Valley 365 Comment
  CLARK-A1528-61  Eriochloa acuminata John C. Roos 1951-9-25 5294 Riverside Riverside 259 Comment
  RSA444801  Eriochloa acuminata J. C. Roos 1957-6-20 6614 San Bernardino Loma Linda. 305 Comment
  UCD65712  Eriochloa acuminata A. R. Roos 1937-11-28 Riverside East Washington St., Riverside. Comment
  LA206376  Eriochloa acuminata var. acuminata John C. Roos; 1950-8-22 4945 San Bernardino San Bernandino Valley, Highland 457 Comment
  CLARK-A1528-4615  Eriochloa aristata John C. Roos 1965-9-26 Riverside Indio Comment
  LA105134  Eriochloa aristata var. aristata John C. Roos; 1985-12-22 5962 Riverside Deep Canyon, Coachella Valley, 0.25 NW of Valerie Jean, W of Hwy 86, SE 0.25 -30 Comment
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Mar 23 2014
  UCSB45569  Eriochloa contracta Roos, John 1963-8-10 Riverside Blythe Comment
  RSA47437  Eriodictyon angustifolium J. C. Roos 1949-6-20 4410 San Bernardino New York Mountains: Mouth of Keystone Canyon. 1616 Comment
  CLARK-A1528-3613  Eriogonum angulosum John C. Roos 1937-4-25 2099 San Bernardino Essex Comment
  CLARK-A1528-3614  Eriogonum angulosum John C. Roos 1937-8-11 1816 Kern Tehachapi Pass Comment
  CLARK-A1528-5715  Eriogonum apiculatum John C. Roos 1947-9-6 3743 Riverside San Jacinto Mountains Comment
  CLARK-A1528-3618  Eriogonum baileyi John C. Roos, Edmund C. Jaeger 1955-7-21 6496 Inyo Last Chance Mountains 1828 Comment
  RSA155701  Eriogonum baileyi var. baileyi J. C. Roos, E. C. Jaeger 1955-7-21 6496 Inyo Willow Spring, Last Chance Mountains. 1829 Comment
  RSA155713  Eriogonum baileyi var. baileyi J. C. Roos, A. R. Roos 1955-8-24 6535 Inyo 2 miles NE of Willow Spring. Last Chance Mountains. 2012 Comment
  SD52867  Eriogonum baileyi var. baileyi John C. Roos, Alfred R. Roos 1955-7-21 6496 Inyo Willow Spring, Last Chance Mountains 1829 Comment
  UCR24290  Eriogonum brachyanthum John C. Roos 1955-7-24 6523 Inyo Northern Mojave Desert, Nelson Range near head of Grapevine Canyon 1890 Comment
  CLARK-A1528-3643  Eriogonum brachypodum John C. Roos 1955-7-23 6507 Inyo Inyo Mountains 2194 Comment
  POM274226  Eriogonum brachypodum J. C. Roos 1947-7-15 2823 Inyo Darwin Mesa. Comment
  HSC78595  Eriogonum brachypodum J. C. Roos 1965-7-10 Inyo S slope trail to Telescope Peak, Panamint Mountains 2744 Comment
  UCR24267  Eriogonum cernuum John C. Roos 1955-7-23 6507 Inyo Northern Mojave Desert, Soldier Flat [apparently =Whippoorwill Flat] at east base of Waucoba Mtn., Inyo Mountains 2195 Comment
  UC1234678  Eriogonum cernuum var. cernuum J. C. Roos 1955-7-23 6507 Inyo Soldier Flat at e base of Waucoba Mountain Inyo Mountains, Waucoba Mountain 2194 Comment
  CLARK-A1528-3622  Eriogonum cinereum John C. Roos 1942-9-26 1727 Los Angeles Santa Monica Comment
  CAS-BOT-BC242573  Eriogonum crocatum J. C. Roos 1958-5-22 s.n. Ventura Conejo Grade summit on N. base of Santa Monica Mtns. Comment
  CLARK-A1528-3644  Eriogonum davidsonii John C. Roos 1937-5-31 1820 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3697  Eriogonum davidsonii John C. Roos 1937-8-10 1815 Kern Walker Pass Comment
  UCR25398  Eriogonum deflexum John C. Roos 1937-4-27 774 San Bernardino Eastern Mojave Desert, Goffs Comment
  CAS-BOT-BC256245  Eriogonum deflexum var. baratum J. C. Roos 1955-7-21 6489 Inyo 2.5 miles south of Willow Spring, ridge at crest of Last Chance Mountains 2346 Comment
  RSA393501  Eriogonum elongatum var. elongatum A. R. Roos 1922-11-8 s.n. Los Angeles San Gabriel Mountians: Lytle Creek Canyon 915 Comment
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Aug 18 2012
  RSA155654  Eriogonum esmeraldense J. C. Roos, A. R. Roos 1955-8-26 6549 Inyo East side of saddle between Sqauw Peak and Waucoba Mt., Inyo Mountains. Comment
  CLARK-A1528-3639  Eriogonum fasciculatum subsp. polifolium John C. Roos 1937-5-29 2050 San Bernardino Deep Creek Comment
  UCR24264  Eriogonum fasciculatum subsp. polifolium John C. Roos 1955-5-13 6347 Inyo Northern Mojave Desert, west base of Last Chance Mountains, east of Eureka Valley sand dunes 1220 Comment
  RSA664935  Eriogonum fasciculatum var. foliolosum J. C. Roos 1965-6-6 s.n. San Bernardino Mill Creek. San Bernardino Mountains. Comment
  RSA104293  Eriogonum fasciculatum var. polifolium J. C. Roos 1955-5-13 6347 Inyo West base Last Chance Mountains, east of Eureka Valley sand dunes 1220 Comment
  RSA393357  Eriogonum fasciculatum var. polifolium A. R. Roos 1922-11-8 s.n. San Bernardino Near Loma Linda 915 Comment
  UCR20400  Eriogonum gracile var. gracile John C. Roos 1952-8-27 5888 Riverside Peninsular Range, Riverside; Pigeon Pass, Box Springs Mtns. 457 Comment
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Apr 16 2011
  CAS-BOT-BC252280  Eriogonum heermannii var. argense J. C. Roos; A. R. Roos 1955-8-24 6537 Inyo Ridge 2 miles south of Willow Spring, Last Chance Mts. 2286 Comment
  CLARK-A1528-5164  Eriogonum heermannii var. argense John C. Roos 1953-8-8 5937 Inyo Inyo Mountains 2743 Comment
  RSA155715  Eriogonum heermannii var. argense J. C. Roos, A. R. Roos 1955-8-24 6537 Inyo Ridge 2 miles south of Willow Spring, Last Chance Mts. 2287 Comment
  CLARK-A1528-3658  Eriogonum incanum John C. Roos 1937-8-5 1660 Mono White Mountains 2743-3048 Comment
  UCR25325  Eriogonum incanum John C. Roos 1942-6-25 1264 Mariposa Sierra Nevada Mtns., Yosemite National Park, top of Half Dome 2683 Comment
  CLARK-A1528-3659  Eriogonum inflatum John C. Roos 1946-9-21 3079 San Bernardino San Bernardino Mountains 1231 Comment
  RSA92342  Eriogonum insigne J. C. Roos, Lucille Roos 1952-6-28 6172 Imperial SE end Eureka Valley. 915 Comment
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Jun 4 2014
  RSA158116  Eriogonum kearneyi subsp. monoense J. C. Roos, E. C. Jaeger 1955-7-22 6503 Inyo Solidier Flat, east base Waucoba Mountain, Inyo Mountains. 2195 Comment
  CLARK-A1528-3668  Eriogonum microthecum var. corymbosoides John C. Roos 1941-10-18 859 San Bernardino Bear Valley 2651 Comment
  UCR24262  Eriogonum microthecum var. corymbosoides John C. Roos 1937-7-28 1948 San Bernardino San Bernardino Mtns, Van Deusen Canyon [Caribou Creek], near Bear Valley 2195 Comment
  NY282224  Eriogonum microthecum var. lapidicola J. C. Roos 1953-8-7 5931 Inyo Badger Flat near Blue Bell Mine, Inyo Mts. 2682.2 Comment
  SD125900  Eriogonum microthecum var. lapidicola J. C. Roos 1967-8-6 Inyo Inyo Mountains, 1 mile north-east of Badger Flat. Rocky slopes 2804 Comment
  CAS-BOT-BC268698  Eriogonum microthecum var. laxiflorum J. C. Roos; A. R. Roos 1953-8-7 5931 Inyo Badget Flat near Blue Bell Mine, Inyo Mts. 2682 Comment
  CLARK-A1528-3669  Eriogonum microthecum var. panamintense John C. Roos 1941-8-17 73 Inyo Panamint Mountains 2682 Comment
  CLARK-A1528-3679  Eriogonum nudum subsp. saxicola John C. Roos 1937-8-10 1044 Kern Bodfish Comment
  UCR24322  Eriogonum nudum var. indictum Alfred R. Roos 1937-7-4 1918 Santa Barbara Sierra Madre Mountains, Upper Cuyama Valley 427 Comment
  RSA40543  Eriogonum nudum var. westonii J. C. Roos 1947-7-15 2871 Inyo Wildrose Canyon at Kilns, Panamint Mountains. 1433 Comment
  CAS-BOT-BC258555  Eriogonum nummulare J. C. Roos; A. R. Roos 1955-8-25 6545 Inyo Last Chance Mts. 0.1 mile NW of boundary marker #80, east of Willow Spring 2072 Comment
  RSA71706  Eriogonum ovalifolium J. C. Roos, Lucille Roos 1952-7-31 5877 Inyo 1 mile south of Reed Flat, White Mountains. 2835 Comment
  CAS-BOT-BC258640  Eriogonum ovalifolium var. nivale John Roos; Lucille Roos 1954-6-26 6158 Inyo Badget Flat, Inyo Mts. 2621 Comment
  RSA155707  Eriogonum palmerianum J. C. Roos 1955-7-21 6490 Inyo Rides at crest of Last Chance Mountains 2.5 miles south of Willow Spring. 2348 Comment
  RSA158995  Eriogonum panamintense var. mensicola J. C. Roos 1955-7-24 6521 Inyo Nelson Range near head of Grapevine Canyon 1890 Comment
  CAS-BOT-BC265555  Eriogonum parishii J. C. Roos 1965-10-2 s.n. San Bernardino Camp Angelus, San Bernardino Mtns. Comment
  CLARK-A1528-5206  Eriogonum parishii John C. Roos 1936-8-15 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3691  Eriogonum plumatella John C. Roos 1943-10-17 2743 Riverside Morongo Valley Comment
  POM263052  Eriogonum pusillum J. C. Roos 1941-4-5 197 San Bernardino Dry Morongo Canyon, Colorado Desert. Comment
  RSA450150  Eriogonum rixfordii J. C. Roos 1965-9-18 s.n. Inyo Panamint Mtns.Wild Rose Canyon. Comment
  UCR26229  Eriogonum rixfordii John C. Roos 1947-1-26 3200 Inyo Emigrant Canyon below Emigrant Spring, Death Valley 1150 Comment
  POM265722  Eriogonum roseum J. C. Roos 1937-8-10 1045 Kern Hills north of Caliente. Comment
  UCR27654  Eriogonum thomasii John C. Roos 1966-3-20 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mountains, 2 miles southeast of Desert Center 366 Comment
  UC1010235  Eriogonum thurberi John C. Roos 1951-6-16 5063 San Bernardino Loma Linda San Bernardino Valley, Loma Linda 304 Comment
  CLARK-A1528-3717  Eriogonum umbellatum John C. Roos 1949-9-2 4645 Inyo 2133 Comment
  RSA450091  Eriogonum umbellatum J. C. Roos 1946-10-5 3117 San Bernardino Pipes Creek. 2134 Comment
  POM261426  Eriogonum umbellatum var. dichrocephalum J. C. Roos 1941-08 74 Inyo Mahogany Flats, Panamint Mountains. 2470 Comment
  RSA48886  Eriogonum umbellatum var. juniporinum J. C. Roos 1949-9-2 4637 San Bernardino N slope of the Kingston Mtns. 2012 Comment
  UCR20527  Eriogonum umbellatum var. juniporinum John C. Roos, R. Weatherby 1949-9-2 4645 San Bernardino Eastern Mojave Desert, NE side of Kingston Peak, Kingston Mountains 2134 Comment
  POM261424  Eriogonum umbellatum var. subaridum J. C. Roos 1941-8-15 69 Inyo Wildrose Canyon by Kilns, Panamint Mountains. Comment
  CAS-BOT-BC262196  Eriogonum umbellatum var. versicolor J. C. Roos 1955-6-19 6432 Inyo One mile SE of Willow Spring, Last Chance Mountains 1950 Comment
  RSA79619  Eriogonum umbellatum var. versicolor J. C. Roos, A. R. Roos 1953-8-8 5932 Inyo Blue Bell Mine, Badger Flat, Inyo Mtns. 2683 Comment
  CLARK-A1528-3725  Eriogonum wrightii subsp. subscaposum John C. Roos 1937-7-15 386 San Bernardino San Gabriel Mountains Comment
  POM302506  Eriogonum wrightii var. nodosum J. C. Roos 1943-10-16 2741 San Bernardino Little San Bernardino Mountains. 1524 Comment
  RSA71720  Eriogonum wrightii var. subscaposum J. C. Roos, Lucille Roos 1952-7-27 5826 Inyo West rim of Reed Flat, White Mtns. 3110 Comment
  POM265769  Eriogonum wrightii var. wrightii J. C. Roos 1937-8-25 2027 San Bernardino Near Barnwell, New York Mountains Comment
  CAS-BOT-BC297385  Eriophyllum confertiflorum J. C. Roos 1981-8-1 s.n. San Bernardino Upper Santa Ana basin, near Fish Creek, San Bernardino Mts Comment
  CLARK-A1528-1837  Eriophyllum confertiflorum John C. Roos 1948-5-1 3811 Riverside Whitewater 548 Comment
  UCR26156  Eriophyllum confertiflorum John C. Roos 1948-5-1 3811 Riverside Western Colorado Desert/ San Bernardino Mtns., Whitewater, N slope on a mountainside 549 Comment
  CLARK-A1528-5321  Eriophyllum multicaule John C. Roos 1940-5-4 882 Riverside Reche Canyon Comment
  RSA92742  Eriophyllum multicaule J. C. Roos 1952-5-19 5690 Riverside One year old burn on hills N of Moreno. 503 Comment
  CLARK-A1528-1305  Erodium botrys John C. Roos 1943-3-27 2622 Los Angeles West Los Angeles 0 Comment
  CLARK-A1528-5432  Erodium botrys John C. Roos 1943-3-27 2622 Los Angeles West Los Angeles 0 Comment
  CLARK-A1528-4856  Erodium moschatum John C. Roos 1937-5-2 1402 Riverside Riverside Comment
  UCR26194  Eschscholzia glyptosperma John C. Roos 1947-2-15 3261 Riverside Sonoran (Colorado) Desert, Eagle Mtns Comment
  CAS-BOT-BC419632  Eschscholzia parishii J. C. Roos 1966-3-26 s.n. Riverside 2 miles S.E. of Desert Center Comment
  UC1506368  Eucephalus breweri J. C. Roos 1947-9-6 4013 Tuolumne forest slopes near Tuolumne Grove Big Trees; Yosemite National Park 1219 Comment
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1
  UCR31735  Eucephalus breweri John C. Roos 1948-9-7 4013 Tuolumne Sierra Nevada Mountains, Yosemite National Park, slopes near Tuolumne Grove Big Trees 1220 Comment
  CLARK-A1528-5689  Eucnide urens John C. Roos 1947-4-19 3483 Inyo Death Valley National Park Comment
  RSA444470  Eucnide urens J. C. Roos 1961-7-9 s.n. Inyo Range NE of Trona, Inyo County Comment
  CLARK-A1528-2491  Euonymus occidentalis subsp. parishii John C. Roos 1943-8-8 269 Riverside San Jacinto Mountains 1828 Comment
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Mar 22 2014
  CLARK-A1528-2697  Euphorbia eriantha John C. Roos 1946-10-26 3140 Riverside Chuckwalla Mountains Comment
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Jan 30 2015
  UCR18854  Euphorbia maculata John C. Roos 1965-7-28 s.n. San Bernardino San Bernardino Valley, Loma Linda 396 Comment
  UCR25149  Euphorbia maculata John C. Roos, L. Roos 1951-7-28 5066 San Bernardino San Bernardino Valley, Hwy 99, near Alabama Street west of Redlands 366 Comment
  UCR25148  Euphorbia nutans John C. Roos, L. Roos 1951-7-28 5065 San Bernardino San Bernardino Valley, Hwy 99, near Alabama Street west of Redlands 366 Comment
  RSA444476  Euphorbia peplus J. C. Roos 1965-6-20 s.n San Bernardino Lawn in Loma Linda. Comment
  CLARK-A1528-2705  Euphorbia polycarpa John C. Roos 1965-6-23 Riverside Cactus City Comment
  UCR22192  Euphorbia revoluta John C. Roos, A. R. Roos 1950-8-4 4891 San Bernardino Eastern Mojave Desert, north side of Clark Mountain 1220 Comment
  CLARK-A1528-2634  Euphorbia serpyllifolia John C. Roos 1946-9-3 2976 San Bernardino Oak Glen Comment
  CLARK-A1528-2638  Euphorbia setiloba John C. Roos 1950-9-1 4962 San Bernardino Clark Mountain Range 1645 Comment
  CLARK-A1528-4999  Eurotia lanata John C. Roos 1937-5-30 2053 San Bernardino Victorville Comment
  RSA444664  Fagonia laevis J. C. Roos 1966-3-26 s.n. Riverside 2 miles SE of Desert Center. Comment
  UCR23760  Fagonia laevis John C. Roos 1966-3-26 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mountains, 2 mi SE of Desert Center 366 Comment
  CLARK-A1528-3990  Fallugia paradoxa John C. Roos 1937-4-26 2113 San Bernardino Providence Mountains Comment
  RSA155731  Fendlerella utahensis J. C. Roos 1955-6-19 6451 Inyo Last Chance Mountains: Whitetop Peak, 2 miles west of Last Chance Spring. 2576 Comment
  CLARK-A1528-7831  Festuca arundinacea John C. Roos 1949-5-21 4317 Riverside Temecula 304 Comment
  CLARK-A1528-1007  Festuca brachyphylla John C. Roos 1937-8-8 417 Inyo Sierra Nevada Mountains Comment
  CLARK-A1528-4645  Festuca brachyphylla John C. Roos 1941-8-27 30 San Bernardino Mount San Gorgonio 3047 Comment
  CLARK-A1528-4650  Festuca californica subsp. parishii John C. Roos 1919-7-24 San Bernardino San Bernardino Mountains Comment
  POM261420  Festuca californica subsp. parishii J. C. Roos 1941-6-1 92 San Bernardino Near Glen Martin. Near falls on road below. Comment
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Feb 20 2015
  RSA0047249  Festuca californica subsp. parishii J. C. Roos, L. Roos 1951-6-9 5061 San Bernardino Fredalba, San Bernardino Mts. 1767 Comment
  UCR23936  Festuca californica var. parishii John C. Roos 1943-4-21 2633 San Bernardino San Bernardino Mtns, Waterman Canyon 854 Comment
  UCR19345  Festuca kingii John C. Roos 1965-6-26 s.n. San Bernardino San Bernardino Mtns, Upper Santa Ana River Canyon near Heart Bar Park Comment
  UCR23935  Festuca myuros John C. Roos, L. Roos 1950-4-15 4741 Riverside Peninsular Range, Box Springs Mtns., Pigeon Pass 457 Comment
  CLARK-A1528-4660  Festuca octoflora John C. Roos 1950-4-15 4737 San Bernardino San Timoteo Canyon Comment
  CLARK-A1528-4670  Festuca reflexa John C. Roos 1938-4-9 1641 Riverside Riverside Comment
  RSA415964  Festuca rubra J. C. Roos, Steve Boyd 1965-7-31 s.n. San Bernardino South Fork Meadows, San Bernardino Mountains. 2287 Comment
  UCR24045  Festuca rubra John C. Roos 1940-8-17 1594 San Bernardino San Bernardino Mtns, South Fork, above Lutheran Camp. Along the creek Comment
  UCR27416  Festuca rubra John C. Roos 1950-7-20 4864 San Francisco San Francisco Bay Region, San Francisco City College 91 Comment
  OBI30460  Festuca rubra John C. Roos 1950-7-20 4864 San Francisco Field at San Francisco City College 91 Comment
  UCR25779  Filago californica John C. Roos 1952-4-13 5528 Riverside Peninsular Range, Box Springs Mountains 520 Comment
  UCR23794  Filago depressa John C. Roos 1959-3-28 s.n. San Bernardino Mojave Desert, 2-5 mi north of Kramer Junction 808 Comment
  UCR23797  Filago gallica Alfred R. Roos 1930-6-7 3438 San Francisco Central Coast/ San Francisco Bay Region, Shore Line Road, south of San Francisco Comment
  CLARK-A1528-3288  Forestiera neomexicana John C. Roos 1937-8-11 22 Los Angeles Lancaster Comment
  UCR20383  Forestiera pubescens John C. Roos 1947-6-21 3702 San Bernardino Mojave Desert, Lucerne Valley, Rabbit Springs 884 Comment
  RSA47536  Forsellesia nevadensis J. C. Roos, L. Roos 1949-6-22 4451 San Bernardino New York Mtns, Keystone Canyon. 1829 Comment
  CLARK-A1528-2928  Frankenia grandifolia John C. Roos 1937-9-16 2568 Riverside Riverside Comment
  CLARK-A1528-2929  Frankenia grandifolia John C. Roos 1941-6-16 San Diego Pacific Beach Comment
  CLARK-A1528-5248  Frankenia grandifolia var. campestris John C. Roos 1937-5-23 2342 Riverside Riverside Comment
  RSA47202  Frasera albomarginata J. C. Roos 1949-6-20 4419 San Bernardino New York Mountains: Keystone Canyon 1677 Comment
  UCR23695  Frasera albomarginata John C. Roos 1949-6-20 4419 San Bernardino Eastern Mojave Desert, New York Mountains, Keystone Canyon 1738 Comment
  UCR23696  Frasera neglecta John C. Roos 1937-7-28 1943 San Bernardino San Bernardino Mtns, Holcomb Valley 2043 Comment
  CLARK-A1528-5684  Frasera parryi John C. Roos 1937-6-8 2386 San Diego Warner Springs Comment
  GH384941  Frasera puberulenta J. C. Roos & L. Roos 1952-7-26 5824 Unknown east side Reed Flat at head of Birch Creek, White Mts. 3048 Comment
  CLARK-A1528-2956  Frasera puberulenta John C. Roos, Lucille Roos 1952-7-26 5824 Inyo White Mountains Comment
  CLARK-A1528-3289  Fraxinus anomala John C. Roos 1949-5-28 San Bernardino Clark Mountain Comment
  CLARK-A1528-5365  Fraxinus anomala John C. Roos 1948-9-18 San Bernardino Clark Mountain Comment
  SD52933  Fraxinus anomala J. C. Roos 1955-6-19 6441 Inyo Last Chance Mountains, 3.0 miles south of Willow Spring. 2377 Comment
  CLARK-A1528-3290  Fraxinus dipetala John C. Roos 1947-4-12 3441 San Bernardino San Bernardino Mountains Comment
  POM302491  Fremontodendron californicum J. C. Roos 1943-7-4 2712 San Bernardino Greenspot, north base of Sugarloaf Mountains Comment
  CAS-BOT-BC304319  Galinsoga parviflora John C. Roos 1954-5-11 6116 San Bernardino Corner of Central and Anderson, Loma Linda 320 Comment
  UCR23283  Galinsoga parviflora John C. Roos 1950-11-5 5024 San Bernardino San Bernardino Valley, Near corner of Central and Anderson, Loma Linda 335 Comment
  POM263133  Galinsoga parviflora var. parviflora J. C. Roos 1941-2-18 201 San Bernardino Loma Linda, San Bernardino Valley. Comment
  CLARK-A1528-4048  Galium angustifolium John C. Roos 1937-7-20 485 San Bernardino San Bernardino Mountains Comment
  CHSC1616  Galium bolanderi E. Roos 1930-4-28 Butte Rifle Range, Bidwell Park. 91 Comment
  CAS-BOT-BC223091  Galium hilendiae subsp. carneum John Roos; Lucille Roos 1947-7-14 2855 Inyo North slope Baldy Peak (3 mi n Telescope Peak, probably = Rogers Peak), Panamint Mts. 2560 Comment
  UCR27938  Galium hypotrichium John C. Roos 1965-7-10 s.n. Inyo Northern Mojave Desert, south slope trail to Telescope Peak, Panamint Mountains 2744 Comment
  OBI33221  Galium hypotrichium subsp. tomentellum J. C. Roos 1965-7-10 s.n. Inyo S slope of Telescope Peak, near peak, Panamint Mts Comment
  GH385952  Galium matthewsii J. C. Roos 1955-5-16 6385 Unknown along Loretto road 1.5 miles southwest of Loretto Mine, Inyo Mts. 1676 Comment
  RSA155680  Galium multiflorum J. C. Roos 1955-6-17 6419 Inyo 2 miles NE of Willow Springs, Last Chance Mountains. 2012 Comment
  RSA105010  Galium multiflorum J. C. Roos 1955-5-16 6385 Inyo narrow canyon along Loretto road 1.5 miles southwest of Loretto Mine 1677 Comment
  CLARK-A1528-3952  Galium munzii John C. Roos 1949-6-21 4433 San Bernardino New York Mountains 1828 Comment
  CLARK-A1528-4049  Galium munzii John C. Roos 1947-7-13 2876 Inyo Panamint Mountains 3261 Comment
  CLARK-A1528-5118  Galium nuttallii John C. Roos 1937-6-13 1438 San Diego East San Diego Comment
  RSA47420  Galium parishii J. C. Roos, L. Roos 1949-6-27 4514 San Bernardino North slope Kingston Mts. 1982 Comment
  UCR23491  Galium parishii John C. Roos 1936-9-15 2510 Riverside San Jacinto Mtns., Above Idyllwild Comment
  POM263038  Galium stellatum J. C. Roos 1937-4-24 483 San Bernardino Sheep Hole Mts., East of 29 Palms. Comment
  UCSB45609  Galium stellatum Roos, John 1949-4-6 Riverside Canyon in the Orocopia Mtns. 2 1/2 miles N.E. of Dos Palmas Spring 182 Comment
  UCR25406  Galium stellatum subsp. eremicum John C. Roos, Lucille Roos 1949-4-6 4144 Riverside Sonoran (Colorado) Desert, Canyon in the Orocopia Mountains, 2.5 mi. NE of Dos Palmas Spring 152 Comment
  UCR23824  Gamochaeta pensylvanica John C. Roos, L. Roos 1952-6-23 5785 San Bernardino San Bernardino Valley, Loma Linda 320 Comment
  CLARK-A1528-2936  Garrya flavescens John C. Roos 1947-3-15 3336 Riverside San Jacinto Mountains 1066 Comment
  CLARK-A1528-4971  Garrya flavescens John C. Roos 1949-6-19 4409 San Bernardino Clark Mountain 1950 Comment
  CLARK-A1528-5683  Garrya flavescens John C. Roos 1950-2-17 San Bernardino Yucaipa Comment
  CLARK-A1528-7747  Garrya flavescens John C. Roos 1950-5-6 4788 Riverside Santa Ana Mountains 1036 Comment
  CLARK-A1528-3331  Gaura coccinea John C. Roos 1949-5-28 4340 San Bernardino Clark Mountain Comment
  UCR19033  Gaura sinuata John C. Roos 1950-5-16 4810 San Bernardino San Timoteo Canyon, canyon c. 1 mi. south of Redlands So. Pac. R.R. Station 457 Comment
  POM263082  Gayophytum diffusum subsp. parviflorum J. C. Roos 1937-7-26 353 San Bernardino Bear Valley, San Bernardino Mountains. Comment
  UCR30510  Gayophytum diffusum subsp. parviflorum John C. Roos, A. R. Roos 1953-8-11 5999 Inyo Northern Mojave Desert, Inyo Mtns: 2.5 mi east of Blue Bell Mine 2988 Comment
  UCR18852  Gentiana amarella John C. Roos, L. Roos 1952-7-30 5864 Mono White Mountains, along Crooked Creek 2835 Comment
  CLARK-A1528-5710  Gentiana newberryi John C. Roos 1948-9-7 4006 Mono Comment
  CLARK-A1528-2952  Gentiana simplex John C. Roos 1966-8-6 San Bernardino San Bernardino Mountains Comment
  UCR25798  Geranium carolinianum John C. Roos 1952-5-7 5620 Riverside Box Springs Mountains above Canyon Crest Heights 503 Comment
  UCD103507  Geranium robertianum A. R. Roos 1958-6-3 s.n. Los Angeles In the lathhouses and elsewhere on the grounds of Evans and Reeves Nursery. Brentwood West Los Angeles. Comment
  UCR19198  Gilia achilleifolia John C. Roos 1937-4-17 s.n. San Diego Peninsular Range, Lake Henshaw Comment
  UCR25331  Gilia aliquanta John C. Roos 1955-4-8 6305 Inyo Northern Mojave Desert, Last Chance Mtns, east of the Eureka Valley sand dunes. 1280 Comment
  UCR31664  Gilia aliquanta John C. Roos 1949-6-23 4460 San Bernardino Eastern Mojave Desert, Rock Spring, Mid Hills 1463 Comment
  CLARK-A1528-3502  Gilia angelensis John C. Roos 1952-4-2 5460 Riverside Box Springs 487 Comment
  UCR19161  Gilia angelensis John C. Roos 1966-3-22 s.n. Riverside Moreno Valley, Edgemont. Comment
  RSA0017223  Gilia ochroleuca subsp. ochroleuca J. C. Roos 1955-6-17 6411 Inyo 2 miles north of Willow Spring, Last Chance Mountains. 2011 Comment
  CLARK-A1528-3513  Gilia scopulorum John C. Roos 1955-4-6 6298 Inyo Inyo Mountains 502 Comment
  CLARK-A1528-3514  Gilia sinuata John C. Roos, Lucille Roos 1949-6-27 4516 San Bernardino Kingston Mountains 2072 Comment
  RSA92719  Gilia sinuata J. C. Roos, L. Roos 1952-5-10 5626 San Bernardino Kremer Hills {Kramer Hills} 854 Comment
  POM264091  Gilia tricolor subsp. diffusa J. C. Roos 1937-3-25 652 Kern plains below Grapevine. Comment
  CLARK-A1528-3096  Glechoma hederacea John C. Roos 1954-4-7 6059 San Bernardino Loma Linda Valley 350 Comment
  CLARK-A1528-4675  Glyceria elata John C. Roos 1941-8-2 85 Riverside San Jacinto Mountains Comment
  UCR24009  Glyceria elata John C. Roos 1965-7-3 s.n. Riverside San Jacinto Mtns., Dark Canyon, north fork of the San Jacinto River Comment
  UCR25613  Glyceria elata John C. Roos 1937-7-21 419 San Bernardino San Bernardino Mtns, South Fork [Santa Ana River, near USFS campground] 1829 Comment
  UCSB45536  Glyceria elata Roos, John 1955-7-2 Sonoma Miller Ridge Comment
  POM263016  Glyceria striata J. C. Roos 1937-7-21 419 San Bernardino South Fork Santa Ana Comment
  CLARK-A1528-2183  Gnaphalium beneolens John C. Roos 1947-8-23 3741 San Bernardino Loma Linda 426 Comment
  CLARK-A1528-1851  Gnaphalium californicum John C. Roos 1952-6-8 5750 Riverside Reche Canyon 548 Comment
  CLARK-A1528-1793  Gnaphalium microcephalum John C. Roos 1961-10-28 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1857  Gnaphalium microcephalum John C. Roos 1937-7-1 2473 Santa Barbara Santa Barbara Comment
  UCR25852  Grayia spinosa John C. Roos 1949-4-2 4132 Riverside San Bernardino Mtns., Side canyon off Whitewater Canyon Comment
  RSA0040194  Guizotia abyssinica John C. Roos 1955-7-2 6473 San Diego Escondido. 182 Comment
  CLARK-A1528-1096  Gutierrezia bracteata John C. Roos 1940-9-2 222 Riverside Jackrabbit Trail 609 Comment
  CLARK-A1528-1861  Gutierrezia bracteata John C. Roos 1965-6-21 Riverside Comment
  RSA648085  Gutierrezia californica var. bracteata J. C. Roos 1940-9-2 222 Riverside New Jackrabbit trail. 3 or 4 mi. W of Beaumont. Comment
  SD52995  Gutierrezia microcephala J. C. Roos, A. R. Roos 1955-8-24 6540 Inyo Last Chance Mountains, 1.5 miles northeast of Willow Spring. 1890 Comment
  UCR23827  Gutierrezia microcephala John C. Roos 1946-9-21 3045 San Bernardino Mojave Desert, Rabbit Springs, Lucerne Valley 887 Comment
  RSA450481  Gutierrezia sarothrae J. C. Roos 1966-8-6 s.n. San Bernardino Upper Fish Creek at Fish Creek Meadows. 2439 Comment
  UC1234862  Gutierrezia sarothrae J. C. and A. R. Roos 1955-8-23 6533 Inyo w base Last Chance Mts. e of Eureka Valley sand dunes; Last Chance Mts. 1219 Comment
  CLARK-A1528-1867  Gutierrezia sarothrae John C. Roos 1947-7-11 2842 Inyo Panamint Mountains 2499 Comment
  CLARK-A1528-2317  Halimolobos diffusa var. jaegeri John C. Roos 1948-9-18 San Bernardino Clark Mountain Range 2133 Comment
  RSA79501  Halimolobos jaegeri J. C. Roos 1953-8-14 6024 Inyo Al Rose Canyon, Inyo Mts. 2500 Comment
  CLARK-A1528-1871  Haplopappus acradenius John C. Roos 1946-9-2 2986 San Bernardino San Timoteo Canyon Comment
  CLARK-A1528-1877  Haplopappus brickellioides John C. Roos, Lucille Roos 1955-4-6 6292 Inyo Inyo Mountains 518 Comment
  CLARK-A1528-1880  Haplopappus cuneatus John C. Roos 1948-9-25 4076 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2156  Haplopappus cuneatus John C. Roos 1941-11-15 870 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-7673  Haplopappus gilmanii John C. Roos, Alfred R. Roos 1954-8-14 6216 Inyo Inyo Mountains 0 Comment
  CLARK-A1528-5603  Haplopappus macronema John C. Roos 1959-8-20 Inyo White Mountains 3047 Comment
  CLARK-A1528-5604  Haplopappus macronema John C. Roos 1959-8-20 Inyo White Mountains 3047 Comment
  CLARK-A1528-1898  Haplopappus palmeri John C. Roos 1965-10-9 San Diego La Mesa Comment
  CLARK-A1528-1899  Haplopappus palmeri John C. Roos 1946-10-23 3133 San Bernardino Loma Linda Comment
  CLARK-A1528-1903  Haplopappus pinifolius John C. Roos 1952-8-27 5894 Riverside Pigeon Pass 487 Comment
  CLARK-A1528-1904  Haplopappus squarrosus John C. Roos 1965-10-7 Riverside Comment
  SBBG16843  Hazardia brickellioides J. C. Roos, A. R. Roos 1955-8-23 6530 Inyo W base of Last Chance Mtns, E of Eureka Valley sand dunes 1219 Comment
  POM263008  Hazardia squarrosa var. grindelioides J. C. Roos 1940-9-1 233 San Bernardino Cajon Pass, San Bernardino Mts. 701 Comment
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Jul 17 2014
  CAS-BOT-BC314406  Hecastocleis J. C. Roos; P. A. Munz 1955-4-8 6308 Inyo Last Chance Mtns. east of the Eureka Valley sand dunes 1310 Comment
  RSA85143  Hecastocleis shockleyi J. C. Roos, L. Roos 1954-3-27 6055 Inyo Summit of Grapevine Mts. above Leadfield 1646 Comment
  RSA47423  Hedeoma nana subsp. californica J. C. Roos, L. Roos 1949-6-22 4447 San Bernardino New York Mountains; Keystone Canyon 1738 Comment
  RSA431194  Hedypnois cretica J. C. Roos 1956-5-5 6577 San Diego Marlborough and Adams, San Diego. Comment
  UCD132674  Hedypnois cretica J. C. Roos 1956-5-5 s.n. San Diego Marlborough and Adams. Comment
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Apr 23 2019
  CLARK-A1528-1936  Helenium bigelovii John C. Roos 1965-9-11 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2606  Helianthemum scoparium John C. Roos 1965-6-30 Riverside Santa Ana Mountains Comment
  UCR26095  Helianthus annuus subsp. jaegeri John C. Roos 1948-9-19 4039 San Bernardino Eastern Mojave Desert, Soda Springs, near Baker 284 Comment
  CLARK-A1528-7877  Helianthus bolanderi John C. Roos 1948-9-1 3981 Siskiyou Fort Jones 853 Comment
  RSA44878  Helianthus bolanderi J. C. Roos 1948-8-31 3931 Lake Lakeport. Comment
  UCSB37796  Helianthus bolanderi Roos, John 1956-8-4 Santa Barbara 2 miles S.E. of Figueroa Mtn., along Mission Pine Road 1219 Comment
  UC1042977  Helianthus ciliaris John and Lucille Roos 1954-6-5 6124 San Bernardino near corner of Richardson and Gould Streets (ne of Loma Linda); San Bernardino Valley 304 Comment
  CLARK-A1528-1912  Helianthus niveus subsp. canescens John C. Roos 1962-4-3 Riverside Palm Springs Municipal Airport 121 Comment
  RSA0016433  Helianthus nuttallii subsp. nuttallii J. C. Roos 1965-9-22 s.n. San Bernardino Near the cement plant, Victorville Comment
  CAS-BOT-BC305800  Helianthus petiolaris John Roos; Lucille Roos 1951-9-9 5199 San Bernardino Highway 99 at Etiwanda Ave. between Ontario and Fontana 304 Comment
  POM444679  Helianthus petiolaris J. C. Roos 1965-6-20 s.n. San Bernardino Ontario: Vineyard Comment
  RSA92554  Helianthus petiolaris subsp. petiolaris J. C. Roos, L. Roos 1954-4-30 6071 San Bernardino Corner of Etiwanda Ace. and Highway 99 between Ontario & Fontana. 305 Comment
  UCR23813  Hemizonia floribunda John C. Roos 1965-10-10 s.n. San Diego Peninsular Range, 8 miles southeast of Dulzura [along Hwy 94, near Tecate Peak] Comment
  RSA450491  Hemizonia kelloggii J. C. Roos 1965-6-27 s.n. Riverside Reche Canyon Comment
  CLARK-A1528-2176  Hemizonia tenella John C. Roos 1952-7-19 5816 Riverside Santa Ana Mountains 761 Comment
  RSA92459  Herniaria hirsuta subsp. cinerea J. C. Roos 1954-6-5 6123 San Bernardino Loma Linda. 320 Comment
  CLARK-A1528-2976  Hesperochiron californicus John C. Roos 1951-6-11 4269 San Bernardino Lucerne Valley 883 Comment
  CLARK-A1528-4388  Hesperocnide tenella John C. Roos 1937-2-21 1296 Riverside La Sierra Comment
  UC1042983  Hesperostipa comata John and Lucille Roos 1954-6-26 6162 Inyo canyon at se end Badger Flat; Inyo Mts., Mazourka Canyon 2621 Comment
  RSA92172  Hesperostipa comata subsp. comata J. C. Roos, L. Roos 1955-6-26 6162 Inyo Mazourka Canyon at SE end of Badger Flat, Inyo Mountains 2622 Comment
  CLARK-A1528-1928  Heterotheca grandiflora John C. Roos 1951-9-19 5224 San Bernardino Loma Linda 335 Comment
  CLARK-A1528-1929  Heterotheca grandiflora John C. Roos 1942-9-26 1715 Los Angeles Los Angeles Comment
  UCR23733  Heterotheca sessiliflora subsp. echioides John C. Roos 1965-9-16 s.n. Riverside On State Street, near Florida St., in Hemet 486 Comment
  CAS-BOT-BC312304  Heterotheca villosa var. nana John Roos; Lucille Roos 1950-10-21 5011 Riverside Wonderland of Rocks, Little San Bernardinno Mts. 1219 Comment
  UCR24439  Heuchera hirsutissima John C. Roos 1946-8-27 2784 Riverside Peninsular Range, Santa Rosa Mtns 2287 Comment
  CAS-BOT-BC424468  Heuchera rubescens John Roos; Lucille Roos 1947-7-14 2850 Inyo Baldy Peak, Panamint Mts. 2651 Comment
  CLARK-A1528-4681  Hilaria rigida John C. Roos 1965-9-5 Riverside Chuckwalla Valley Comment
  UCSB51279  Hilaria rigida Roos, John 1965-9-5 Riverside 18 miles W. of Blythe Comment
  SEINET953583  Hoffmannseggia glauca J. C. Roos 1965-1 Riverside 17 miles West of Blythe, Colorado Desert. Comment
  CLARK-A1528-2785  Hoffmannseggia microphylla John C. Roos 1949-3-19 4108 Riverside Mecca Comment
  UCR24049  Holcus lanatus John C. Roos 1950-6-28 847 San Bernardino San Bernardino Valley, College of Medical Evangelists, Loma Linda 323 Comment
  UCR23810  Holocarpha heermannii John C. Roos 1965-8-21 s.n. Tulare Sierra Nevada Mtns., Middle Fork of Kaweah River Canyon, west of Sequoia National Forest Comment
  CLARK-A1528-1946  Holocarpha heermannii John C. Roos 1965-8-21 Tulare Oakwoodland Comment
  UCSB42207  Holocarpha heermannii Roos, John 1965-8-21 Tulare Middle fork of the Kaweah River Canyon, west of Sequoia Natl. Park Comment
  UCR30558  Holodiscus discolor John C. Roos 1937-7-1 2254 Santa Barbara Nojoqui Falls near Solvang Comment
  RSA47535  Holodiscus microphyllus J. C. Roos, L. Roos 1949-6-27 4518 San Bernardino North side of Kingston Mountains 1829 Comment
  UCSB45952  Hordeum brachyantherum subsp. brachyantherum Roos, John 1965-7-18 San Bernardino Big Bear Lake, San Bernardino Mtns. Comment
  CLARK-A1528-4687  Hordeum californicum John C. Roos 1940-8-3 1583 San Bernardino San Bernardino Mountains Comment
  UCR26285  Hordeum depressum John C. Roos 1952-4-22 5566 San Bernardino San Bernardino Valley, Waterman Ave. west of Loma Linda 305 Comment
  RSA45206  Hordeum jubatum J. C. Roos, L. Roos 1949-5-14 4306 San Bernardino Lucerne Valley 884 Comment
  UCSB51365  Hordeum jubatum Roos, John 1965-7-18 San Bernardino Big Bear Lake, San Bernardino Mtns. Comment
  RSA45205  Hordeum marinum subsp. gussoneanum J. C. Roos, Lucille Roos 1949-5-21 4318 Riverside Temecula. 304 Comment
  UCR30530  Hordeum marinum subsp. gussoneanum John C. Roos 1949-5-21 4318 Riverside Peninsular Range, At Temecula 305 Comment
  UCR23465  Horkelia rydbergii John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Snow Valley Comment
  UC1234680  Horkelia wilderae J. C. Roos 1955-8-20 6505 San Bernardino Barton Flats near Barton Creek; San Bernardino Mountains, Barton Flats near Barton Creek 1889 Comment
  POM266315  Hulsea algida J. C. Roos 1937-8-8 1019 Inyo Slope of Mt. Whitney. Comment
  CLARK-A1528-1956  Hulsea vestita John C. Roos 1965-6-26 San Bernardino San Bernardino Mountains Comment
  UCD133287  Hulsea vestita J. C. Roos 1943-7-4 2718 San Bernardino Sugarloaf Mountain, San Bernardino Mountains. 2987 Comment
  CLARK-A1528-1952  Hulsea vestita subsp. callicarpha John C. Roos 1946-8-27 2783 Riverside Santa Rosa Mountains 2407 Comment
  UCSB42190  Hulsea vestita subsp. callicarpha Roos, John 1965-6-13 Riverside West of Mountain Center, San Jacinto Mtns. Comment
  POM266313  Hulsea vestita subsp. parryi J. C. Roos 2469 Los Angeles north slope of Mt. San Antonio 2895 Comment
  RSA450497  Hulsea vestita subsp. parryi J. C. Roos 1965-6-26 s.n. San Bernardino San Bernardino Mountains probably near Barton Flats. Comment
  UC1023416  Hydrocotyle verticillata J. C. and A. R. Roos 1950-8-7 4917 San Bernardino e. Mohave Desert, China Ranch 396 Comment
  RSA450488  Hymenoclea monogyra J. C. Roos 1965-10-9 s.n San Diego Murphy Canyon Comment
  CLARK-A1528-1966  Hymenopappus filifolius var. lugens John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  UCR19533  Hymenoxys cooperi John C. Roos 1948-9-18 4063 San Bernardino Eastern Mojave Desert, north slope of Clark Mountain 1829 Comment
  CLARK-A1528-5163  Hymenoxys odorata John C. Roos 1949-4-8 4199 Imperial 60 Comment
  CLARK-A1528-5169  Hymenoxys odorata John C. Roos 1949-4-8 4199 Imperial 60 Comment
  UCD133369  Hypochaeris glabra J. C. Roos 1948-4-29 2901 San Bernardino carpenters tract in Loma Linda. 335 Comment
  UCR25757  Hyptis emoryi John C. Roos 1937-4-28 776 San Bernardino Sonoran Desert, Rose [Earp], near Parker, Arizona; junction of Parker Road with that going north 118 Comment
  UCSB46875  Impatiens balfourii Roos, John 1957-7-13 San Bernardino Mentone; along the Zanja Creek Comment
  CLARK-A1528-2266  Impatiens balfourii John C. Roos 1957-6-22 6615 San Bernardino Zanja Creek 548 Comment
  RSA0010545  Impatiens balfourii J. C. Roos 1957-7-13 6655 San Bernardino Mentone. Comment
  RSA113419  Impatiens balfourii J. C. Roos, L. Roos 1957-6-22 6615 San Bernardino Zanja at Mentone Health Haven wast of Mentone 549 Comment
  CLARK-A1528-4692  Imperata brevifolia John C. Roos 1938-4-17 1619 Inyo Death Valley Comment
  POM431209  Imperata brevifolia J. C. Roos 1938-11-5 s.n. San Bernardino Arrowhead Hot Springs, south side of San Bernardino Mountains. Comment
  RSA47414  Ipomopsis polycladon J. C. Roos, L. Roos 1949-6-18 4394 San Bernardino Mountain Pass, Clark Mountains 1524 Comment
  POM274199  Isocoma acradenia J. C. Roos 1947-9-18 2791 Los Angeles Lancaster Comment
  UCR24436  Isocoma acradenia subsp. acradenia John C. Roos 1946-9-21 3070 San Bernardino Mojave Desert, Rabbit Springs, Lucerne Valley 887 Comment
  CLARK-A1528-2393  Isomeris arborea John C. Roos 1942-1-1 873 San Bernardino Crystal Mine Comment
  CLARK-A1528-2394  Isomeris arborea var. angustata John C. Roos 1967-3-25 Riverside Whitewater Canyon 457 Comment
  RSA444488  Iva acerosa J. C. Roos 1950-8-7 s.n. Inyo Tecopa. Comment
  CLARK-A1528-5628  Iva axillaris John C. Roos 1937-6-10 1497 San Diego Comment
  POM266296  Iva hayesiana J. C. Roos 1937-8-30 2551 San Diego South of Otay. Comment
  CLARK-A1528-4006  Ivesia pygmaea John C. Roos 1965-8-8 Fresno Kearsage Lakes Comment
  UCR23466  Ivesia pygmaea John C. Roos 1965-8-8 s.n. Fresno Sierra Nevada Mtns., Kearsarge Lake. Middle Section of Kings Canyon National Park 3354 Comment
  UCR26127  Ivesia pygmaea John C. Roos 1937-8-8 538 Inyo Sierra Nevada Mtns., Lone Pine Canyon Comment
  CLARK-A1528-4100  Jamesia americana subsp. californica John C. Roos, Lucille Roos 1954-6-29 6186 Inyo Inyo Mountains 2194 Comment
  UCR24416  Jepsonia parryi John C. Roos 1955-3-26 6280 San Diego Peninsular Range, Moosa Canyon near dam, along Hwy 395, 10 miles north of Escondido 152 Comment
  SEINET13942195 Image available Juglans californica John C. Roos 1966-1 San Bernardino Flats at Palm Ave. and Kendall Dr., north-west of San Bernardino Comment
  RSA450180  Juniperus californica A. R. Roos 1934-1-22 s.n. Riverside Morongo Canyon. Comment
  RSA48888  Juniperus osteosperma J. C. Roos 1949-9-2 4634 San Bernardino North slopes Kingston Mts 2072 Comment
  CLARK-A1528-4430  Kallstroemia californica John C. Roos 1963-10-24 Riverside Hayfield Comment
  SEINET13945561 Image available Kallstroemia californica J. C. Roos 1937-1 357 Riverside Blythe Comment
  SEINET226238 Image available Kallstroemia parviflora A. R. Roos 1950-8-4 San Bernardino North side of Clark Mountain, eastern Mojave Desert. Comment
  UCR23628  Kalmia polifolia subsp. microphylla John C. Roos 1942-7-1 1252 Mariposa Sierra Nevada Mtns, Yosemite National Park, on the Forsythe Pass Trail 2591 Comment
  UCR24469  Keckiella rothrockii subsp. jacintensis John C. Roos 1937-8-18 2534 Riverside San Jacinto Mtns, Hidden Lake Comment
  CLARK-A1528-3962  Kelloggia galioides John C. Roos 1937-7-22 1172 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1184  Kochia americana John C. Roos 1965-9-18 Inyo Inyo Mountains Comment
  UCR24209  Kochia californica John C. Roos 1947-9-18 2790 Los Angeles Western Mojave Desert, 2 mi north of Lancaster 710 Comment
  UCR19013  Koeleria macrantha John C. Roos 1952-4-29 5598 Riverside Reche Canyon 457 Comment
  UCR25357  Koeleria macrantha John C. Roos, L. Roos 1952-5-11 5657 San Bernardino San Bernardino Valley, Scott's Canyon, 2.5 mi. SE of Loma Linda 427 Comment
  CAS-BOT-BC271308  Koeleria pyramidata John Roos; Lucille Roos 1951-8-10 5157 Mono Slopes 1 mile SE of White Mtn. Peak, White Mountains 3962 Comment
  CAS-BOT-BC271309  Koeleria pyramidata John Roos; Lucille Roos 1952-7-30 5869 Mono Crooked Creek, White Mountains 3048 Comment
  RSA0104244  Kopsiopsis strobilacea John C. Roos 1937-7-17 375 Los Angeles Near Telegraph Peak, San Gabriel Mts. Comment
  CLARK-A1528-5489  Krameria grayi John C. Roos 1948-4-24 3804 Riverside Whitewater Comment
  RSA155656  Krascheninnikovia lanata J. C. Roos, A. Roos 1955-8-25 6547 Inyo Little Cowhorn Valley, Inyo Mts. 2188 Comment
  UC1234838  Krascheninnikovia lanata J. C. and A. R. Roos 1955-8-25 6547 Inyo Little Cowhorn Valley Inyo Mts., Little Cowhorn Valley 2186 Comment
  CLARK-A1528-1976  Lactuca serriola John C. Roos 1965-10-7 Riverside Beaumont Comment
  CLARK-A1528-253  Lactuca serriola f. integrifolia John C. Roos 1951-9-15 5203 San Bernardino Loma Linda 304 Comment
  UCR26288  Lamium amplexicaule John C. Roos 1952-2-25 5355 San Bernardino San Bernardino Valley, Bryn Mawr 366 Comment
  UCR24237  Langloisia matthewsii John C. Roos 1949-5-14 4297 San Bernardino Southern Mojave Desert, Pickaninny Buttes 915 Comment
  RSA47445  Langloisia setosissima subsp. punctata J. C. Roos, L. Roos 1949-5-28 4355 San Bernardino North slope of Clark Mt. 1646 Comment
  CLARK-A1528-5636  Lappula floribunda John C. Roos 1937-8-5 1841 Mono White Mountains Comment
  UCR19092  Lappula occidentalis John C. Roos 1948-7-4 3896 Inyo Northern Mojave Desert, Panamint Mountains, Mahogany Flats 2470 Comment
  CLARK-A1528-2242  Lappula redowskii John C. Roos, Lucille Roos 1954-6-26 6155 Inyo Inyo Mountains 2682 Comment
  UCSB46751  Lappula redowskii Roos, John 1967-5-30 San Bernardino Near Arrastre Creek; San Bernardino Mtns. 2286 Comment
  CLARK-A1528-4435  Larrea tridentata John C. Roos 1947-1-26 3213 Inyo Furnace Creek Comment
  RSA390015  Larrea tridentata J. C. Roos 1948-5-8 3817 Riverside Whitewater. 549 Comment
  UCR25417  Lasthenia gracilis John C. Roos, L. Roos 1952-5-10 5643 San Bernardino Mojave Desert, Adelanto 915 Comment
  CLARK-A1528-3228  Lavatera assurgentiflora John C. Roos 1937-6-13 1431 San Diego Imperial Beach Comment
  CLARK-A1528-2184  Layia glandulosa John C. Roos 1941-4-5 190 San Bernardino Little San Bernardino Mountains Comment
  CLARK-A1528-1984  Layia platyglossa John C. Roos 1952-4-13 5525 Riverside Box Springs Mountains 487 Comment
  UCR25544  Layia platyglossa John C. Roos 1941-4-19 170 Riverside Peninsular Range, Loma Linda Hills/Box Springs Mtns.; plateau in Reche Canyon 671 Comment
  CLARK-A1528-1983  Layia ziegleri John C. Roos 1965-6-13 Riverside San Jacinto Mountains Comment
  UCR23629  Ledum glandulosum John C. Roos 1957-7-1 6635 Mendocino Albion Ridge 6 Comment
  CLARK-A1528-4708  Leersia oryzoides John C. Roos 1951-10-14 5322 San Bernardino San Bernardino 304 Comment
  CLARK-A1528-4709  Leersia oryzoides John C. Roos 1965-11-4 Riverside Riverside Comment
  CLARK-A1528-1050  Lemmonia californica John C. Roos 1951-8-8 5106 Mono White Mountains 3200 Comment
  POM264171  Lemna minuta J. C. Roos 1937-7-25 656 San Bernardino Seven Oaks, San Bernardino Mountains. Comment
  CLARK-A1528-2320  Lepidium dictyotum John C. Roos 1950-4-7 4725 San Bernardino Rabbit Springs Comment
  UCR23442  Lepidium lasiocarpum var. georginum John C. Roos 1955-5-13 6333 Inyo Northern Mojave Desert, west base of Last Chance Mtns, east of Eureka Valley sand dunes 1223 Comment
  UCD115863  Lepidium pinnatifidum J. C. Roos 1956-6-15 s.n. Los Angeles Santa Monica Blvd. along railroad tracks between Westwood and Beverly Glen Blvds. Comment
  CLARK-A1528-5233  Lepidium virginicum John C. Roos 1952-3-19 5405 Riverside Box Springs Mountains 487 Comment
  CAS-BOT-BC329387  Lepidospartum latisquamum John C. Roos 1950-9-3 4971 San Bernardino Canyon on S slope Clark Mtn, NW of Mountain Pass, eastern Mohave Desert 1889 Comment
  UC1234684  Lepidospartum latisquamum J. C. Roos 1955-7-22 6500 Inyo wash Willow Creek; w slope Last Chance Mountains, Willow Creek 1615 Comment
  UCR18687  Lepidospartum latisquamum John C. Roos 1950-9-3 4971 (=4408) San Bernardino Eastern Mojave Desert, Clark Mountain, south slope 1890 Comment
  UCR24064  Lepidospartum latisquamum John C. Roos, A. R. Roos 1955-8-24 6539 Inyo Last Chance Mtns, Near Willow Spring 1829 Comment
  UCR24008  Leptochloa filiformis John C. Roos 1965-9-5 s.n. Riverside Sonoran (Colorado) Desert, Blythe 76 Comment
  POM266613  Leptochloa fusca subsp. uninervia J. C. Roos 1937-7-31 2358 San Bernardino Santa Ana River near San Bernardino. Comment
  RSA47328  Leptochloa fusca subsp. uninervia J. C. Roos 1949-7-7 4545 San Bernardino 414 Stewart St. Loma Linda. Comment
  RSA659770  Leptochloa fusca subsp. uninervia J. C. Roos, L. Roos 1951-10-24 5332 Riverside Flats between Arlington and Pedley 229 Comment
  CLARK-A1528-4712  Leptochloa uninervia John C. Roos 1965-9-5 Riverside Blythe Comment
  CLARK-A1528-4716  Leptochloa uninervia John C. Roos 1936-10-9 2509 Orange Olive Comment
  UCR26336  Leptochloa uninervia John C. Roos 1946-9-6 2998 San Bernardino San Bernardino Valley, Near Loma Linda Comment
  CLARK-A1528-3463  Leptodactylon pungens John C. Roos 1937-8-8 1671 Inyo Sierra Nevada Comment
  UCR20501  Leptodactylon pungens John C. Roos 1947-7-13 2891 Inyo Northern Mojave /Great Basin Desert, Panamint Mountains, east slope of Baldy [= Rogers?] Peak [near Arcane Meadow] Comment
  UCSB42112  Leptosiphon pygmaeus subsp. continentalis Roos, John 1950-4-22 Riverside In the hills N.E. of the summit of Reche Canyon 822 Comment
  RSA79488  Lesquerella cordiformis J. C. Roos, A. R. Roos 1953-8-11 6006 Inyo About 3 miles east of Badger Flat 3110 Comment
  CLARK-A1528-5219  Lesquerella kingii John C. Roos 1949-6-24 4486 San Bernardino Clark Mountain Range 2255 Comment
  UCR23438  Lesquerella tenella John C. Roos 1937-4-25 817 San Bernardino Eastern Mojave Desert, 6 mi. below Mitchell Caverns, Providence Mtns. 900 Comment
  RSA47467  Lessingia glandulifera var. glandulifera J. C. Roos 1949-6-23 4458 San Bernardino Near Rock Springs, Mid-hills, New York Mountains. 1463 Comment
  CAS-BOT-BC274394  Leucopoa kingii John Roos; Lucille Roos 1952-7-30 5873 Mono Crooked Creek, White Mts. 3078 Comment
  CHSC1367  Lewisia cotyledon F. Roos 1930-3-10 Trinity Trinity Alps. 2133 Comment
  UCR24223  Lewisia rediviva var. minor John C. Roos 1967-6-30 s.n. San Bernardino San Bernardino Mtns, east edge of Broom Flat 2409 Comment
  CAS-BOT-BC444427  Lewisia rediviva var. minor John Roos; Lucille Roos 1950-7-27 5825 Inyo West side Reed Flat, White Mts. 3078 Comment
  UCR30814  Lilium parryi John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Moonridge, Bear Valley 2226 Comment
  POM301529  Limosella acaulis J. C. Roos 1937-7-19 1160 San Bernardino South of San Bernardino Comment
  CLARK-A1528-3439  Linanthus aureus John C. Roos 1942-5-3 1148 Riverside Joshua Tree Comment
  CLARK-A1528-3464  Linanthus breviculus John C. Roos 1965-6-26 San Bernardino Fish Creek Comment
  UCR24234  Linanthus breviculus John C. Roos 1945-6-27 3724 San Bernardino San Bernardino Mtns., Barton Flats 2287 Comment
  CLARK-A1528-3473  Linanthus dichotomus John C. Roos 1937-3-25 1322 Kern Comment
  CLARK-A1528-3474  Linanthus dichotomus John C. Roos 1937-4-17 San Diego Warner Springs Comment
  CLARK-A1528-3479  Linanthus nuttallii John C. Roos, Lucille Roos 1951-8-8 5093 Inyo White Mountains 3169 Comment
  CLARK-A1528-3482  Linanthus nuttallii subsp. floribundus John C. Roos 1962-5-19 Riverside Santa Ana Mountains Comment
  LA102257  Linanthus pungens John C. Roos; Alfred R. Roos 1953-8-13 6017 Inyo Inyo Mountains, crest of Inyo Mts. 3 mi. E of Badger Flat 3169 Comment
  CLARK-A1528-3486  Linanthus pygmaeus John C. Roos 1950-4-22 4757 Riverside Reche Canyon 822 Comment
  CLARK-A1528-4217  Linaria canadensis John C. Roos 1962-4-7 San Diego Moosa Canyon Comment
  UCR26172  Linaria canadensis John C. Roos 1947-3-15 3346 Riverside San Jacinto Valley, Valle Vista, east of Hemet 549 Comment
  RSA85440  Linaria canadensis var. texana J. C. Roos 1952-4-9 5504 Riverside north side of Mt. Rubidoux 381 Comment
  CLARK-A1528-3208  Linum lewisii John C. Roos 1947-7-13 2886 Inyo Panamint Range 3047 Comment
  CLARK-A1528-3209  Linum lewisii John C. Roos 1949-5-28 4365 San Bernardino Clark Mountain Range Comment
  UCR27435  Lippia lanceolata John C. Roos 1937-8-30 2344 San Diego Sweetwater Lake Comment
  UCR23657  Lobelia cardinalis subsp. graminea John C. Roos 1965-10-2 s.n. San Bernardino San Bernardino Mtns, dripping spring, Monkey Face Falls, Mill Creek Canyon 1524 Comment
  UCR25990  Lobelia dunnii var. serrata John C. Roos 1948-7-31 4073 San Bernardino San Gabriel Mtns, Bonita Falls. Lytle Creek, south of Scotland 1037 Comment
  UCR18962  Loeflingia squarrosa John C. Roos 1952-5-14 5664 Riverside Perris-Aguanga Basin, 2 mi NW of Perris Comment
  UC1043024  Loeflingia squarrosa var. squarrosa John C. Roos 1952-5-14 5664 Riverside along roadside 2 mi nw Perris 487 Comment
  UCD134141  Logfia filaginoides J. C. Roos 1952-4-9 5510 Riverside southeast face Mt. Rubidoux, Riverside. 335 Comment
  UCR26276  Lomatium foeniculaceum John C. Roos, A. R. Roos 1953-8-9 5964 Inyo Inyo Mtns, upper Tamarack Canyon 3110 Comment
  CAS-BOT-BC211144  Lomatium foeniculaceum subsp. inyoense John Roos; Lucille Roos 1954-6-24 6149 Inyo Crest of Inyo Mts. 3 miles east of Badger Flat in headwaters of Marble Canyon Watershed 3169 Comment
  SEINET4310255 Image available Lomatium foeniculaceum subsp. inyoense J. C. Roos 1958-1 Inyo Near Badger Flat, Inyo Mts., Inyo Co., Calif. Comment
  CAS-BOT-BC211143  Lomatium foeniculaceum subsp. inyoense John Roos; Lucille Roos 1954-6-24 6149 Inyo Crest of Inyo Mts. 3 miles east of Badger Flat in headwaters of Marble Canyon Watershed 3169 Comment
  RSA0105143  Lomatium foeniculaceum subsp. inyoense J. C. Roos, A. R. Roos 1953-8-9 5964 Inyo upper Tamarack Canyon, Inyo Mts. 3110 Comment
  CLARK-A1528-1439  Lomatium inyoense John C. Roos 1959-8-23 Mono White Mountains Comment
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May 28 2014
  SEINET10693594 Image available Lomatium inyoense John C. Roos, Lucile Roos 1954-6-24 Roos 6149 Inyo Common on open rocky dry slopes and around pines with Astragalus calycosus, Pinus aristata, Artemisia nova, etc. Crest of Inyo Mts. 3 miles east of Badger Flat in headwaters of Marble Canyon watershed. 3170 Comment
  POM262936  Lomatium lucidum J. C. Roos 1939-5-20 722 San Bernardino Waterman Canyon; San Bernardino Mts. 762 Comment
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Sep 3 2013
  CLARK-A1528-1438  Lomatium lucidum John C. Roos 1939-5-20 722 San Bernardino San Bernardino Mountains 761 Comment
  CLARK-A1528-1444  Lomatium nevadense John C. Roos 1967-5-13 San Bernardino San Bernardino Mountains 914 Comment
  UCR23402  Lomatium nevadense John C. Roos 1967-5-30 s.n. San Bernardino San Bernardino Mtns, east of Broom Flat 2424 Comment
  CLARK-A1528-1443  Lomatium nevadense var. parishii John C. Roos 1967-5-30 San Bernardino San Bernardino Mountains Comment
  LA102197  Lonicera subspicata var. denudata John C. Roos; 1949-7-30 4595 San Diego N of Pala Comment
  RSA48692  Lonicera subspicata var. denudata J. C. Roos 1949-7-30 4595 San Diego North of Pala. Comment
  CLARK-A1528-1129  Lonicera subspicata var. johnstonii John C. Roos 1937-6-11 1513 San Diego 761 Comment
  RSA44271  Lotus argyraeus var. multicaulis J. C. Roos 1949-6-21 3556 San Bernardino New York Mountain (New York Peak) 2225 Comment
  UCR25909  Lotus argyraeus var. multicaulis John C. Roos 1949-6-21 3556 San Bernardino Eastern Mojave Desert, New York Mountains, near New York peak 2226 Comment
  UCR19001  Lotus corniculatus Alfred R. Roos 1961-7-5 s.n. San Bernardino San Bernardino Valley, Loma Linda 396 Comment
  CLARK-A1528-2798  Lotus grandiflorus John C. Roos 1937-5-28 1687 San Bernardino San Bernardino Mountains Comment
  RSA659791  Lotus grandiflorus J. C. Roos 1965-6-16 s.n. San Bernardino North of Cajon Pass. Comment
  UCR25854  Lotus grandiflorus John C. Roos 1937-7-20 969 San Bernardino San Bernardino Mtns., Camp Angelus 1829 Comment
  CLARK-A1528-2800  Lotus heermannii John C. Roos 1952-6-13 5768 Riverside Pigeon Pass 426 Comment
  UCR23902  Lotus nevadensis John C. Roos 1947-6-27 3714 San Bernardino San Bernardino Mtns., Glen Martin 1738 Comment
  UC1234666  Lotus oblongifolius var. oblongifolius J. C. and A. R. Roos 1955-8-28 6566 Inyo 3 mi n Olancha (w side Owens Lake); Owens Lake 1091 Comment
  UCR25550  Lotus scoparius var. brevialatus John C. Roos 1941-4-25 163 Riverside Plateau in Reche Canyon Comment
  UCR25917  Lotus tomentellus John C. Roos 1952-3-28 5426 Imperial Sonoran (Colorado) Desert, Truckhaven [Salton City], W side of Salton Sea 0 Comment
  CAS-BOT-BC60250  Lunaria annua J. C. Roos 1966-5-14 s.n. San Bernardino San Bernardino Mountains. Lytle Creek. Comment
  POM274202  Lupinus argenteus J. C. Roos 1947-7-13 2874 Inyo Telescope Peak, Panamint Moutains. 3293 Comment
  RSA44899  Lupinus argenteus J. C. Roos 1947-7-13 2874 Inyo Telescope Peak, Panamint Moutains. 3293 Comment
  RSA92159  Lupinus argenteus J. C. Roos 1954-6-12 6133 Inyo East slope Wild Rose Peak, Panamint Mountains Comment
  UC1042978  Lupinus argenteus var. heteranthus J. C. and A. R. Roos 1954-6-12 6133 Inyo e slopes Wild Rose Peak; Panamint Mts., e slopes Wild Rose Peak 2621 Comment
  UCR25553  Lupinus bicolor subsp. microphyllus John C. Roos 1941-4-19 169 Riverside Peninsular Range, Loma Linda Hills/Box Springs Mtns.; plateau in Reche Canyon 671 Comment
  UCSB42215  Lupinus breweri Roos, J. 1965-7-18 San Bernardino Bear Valley; San Bernardino Mountains Comment
  CAS-BOT-BC196829  Lupinus breweri var. grandiflorus J. C. Roos 1965-7-18 s.n. San Bernardino Bear Valley, San Bernardino Mtns. Comment
  RSA74566  Lupinus caespitosus J. C. Roos 1951-8-8 5108 Inyo Reed flat, White Mts. 3171 Comment
  POM265687  Lupinus concinnus subsp. concinnus J. C. Roos 1937-6-10 1779 San Diego Jacumba. Comment
  POM263079  Lupinus concinnus subsp. orcuttii J. C. Roos 1937-4-23 685 San Bernardino 29 Palms, Mojave Desert Comment
  CLARK-A1528-2825  Lupinus confertus John C. Roos 1946-8-29 2934 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1156  Lupinus densiflorus John C. Roos 1937-3-26 689 Kern 152 Comment
  UCSB42216  Lupinus excubitus Roos, J. 1965-7-18 San Bernardino Along Bear Valley; San Bernardino Mtns. Comment
  CLARK-A1528-2831  Lupinus excubitus subsp. austromontanus John C. Roos 1937-5-15 1187 San Bernardino San Bernardino Mountains Comment
  CAS-BOT-BC216705  Lupinus excubitus var. excubitus J. C. Roos; A. C. Sanders 1965-6-6 s.n. San Bernardino Mill Creek near Fallsvale, San Bernardino Mountains Comment
  POM274220  Lupinus excubitus var. excubitus J. C. Roos 1947-7-13 2862 Inyo East Slope Baldy Peak, Panamint Mt. Range. 2622 Comment
  UCR23947  Lupinus formosus John C. Roos 1937-8-10 2522 Kern 12 mi N of Caliente 1903 Comment
  CLARK-A1528-2837  Lupinus formosus John C. Roos 1937-5-15 1186 San Bernardino San Bernardino Mountains Comment
  UCR23950  Lupinus holmgrenianus John C. Roos 1955-5-15 6374 Inyo Last Chance Mtns, 2 mi NE of Willow Spring, almost on the Calif.-Nevada state line 2043 Comment
  CLARK-A1528-5071  Lupinus nanus John C. Roos 1937-4-17 511 San Bernardino Redlands Comment
  UCR25164  Lupinus nanus John C. Roos, Lucille Roos 1951-5-27 5052 Mariposa Sierra Nevada Mtns., hills about 8 miles east of Mariposa 1006 Comment
  NY802419  Lupinus polyphyllus var. humicola J. C. Roos 1955-5-15 6374 Inyo 2 miles northeast of Willow Spring, Last Chance Mountains, almost on the Calif-Nevada state line. 2042 Comment
  UC1080637  Lupinus shockleyi John C. Roos 1955-5-13 6360 Inyo sand dunes at mouth of Marble Canyon mouth of Marble Canyon (w side Eureka Valley); , Mouth of Marble Canyon 1036 Comment
  RSA105016  Lupinus shockleyi J. C. Roos 1955-5-13 6360 Inyo West side Eureka Valley at mouth of Marble Canyon. 1037 Comment
  RSA450195  Lupinus sparsiflorus subsp. sparsiflorus J. C. Roos 1947-2-22 3295 San Bernardino Deep Creek, San Bernardino Mtns Comment
  CLARK-A1528-2851  Lupinus truncatus John C. Roos 1947-3-15 3326 Riverside Valle Vista Comment
  CLARK-A1528-4951  Lupinus truncatus John C. Roos 1948-4-24 3788 Riverside Cabazon Comment
  CAS-BOT-BC231412  Lycium andersonii J. C. Roos 1966-2-12 s.n. Riverside 2 miles east of Desert Center Comment
  CLARK-A1528-4346  Lycium andersonii John C. Roos 1937-4-18 1377 Riverside Snow Creek Comment
  POM251786  Lycium andersonii J. C. Roos 1938-4-27 19 Riverside Hill west of Arlington. Comment
  CLARK-A1528-4352  Lycopersicon esculentum John C. Roos 1965-12-6 San Bernardino Loma Linda Comment
  POM301537  Lycopus americanus J. C. Roos 1937-8-24 1201 San Bernardino South of San Bernardino. Comment
  UCR23640  Lycopus americanus John C. Roos 1937-8-24 1201 San Bernardino San Bernardino Valley, San Bernardino 305 Comment
  CLARK-A1528-3216  Lythrum hyssopifolia John C. Roos 1938-6-19 Sonoma Novato Comment
  RSA69830  Machaeranthera asteroides J. C. Roos 1951-10-19 5330 Riverside Gilman Hot Springs 459 Comment
  RSA450762  Machaeranthera asteroides var. asteroides J. C. Roos 1965-10-5 s.n. Riverside Hemet. Comment
  CLARK-A1528-1995  Machaeranthera canescens John C. Roos 1937-7-22 1163 San Bernardino San Gorgonio Wilderness Comment
  RSA335252  Machaeranthera canescens J. C. Roos 1966-8-13 s.n. Kern Fish Creek, San Bernardino Mtns. 2317 Comment
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Mar 12 2014
  RSA79705  Machaeranthera canescens var. leucanthemifolia J. C. Roos 1953-8-8 5941 Inyo Badger flat, Inyo Mountains 2652 Comment
  CLARK-A1528-2001  Machaeranthera cognata John C. Roos 1947-1-2 3226 Riverside Painted Canyon Comment
  UCR18601  Machaeranthera gracilis John C. Roos 1949-6-23 4466 San Bernardino Eastern Mojave Desert, Lanfair Valley, NW of Hackberry Mtn. 1311 Comment
  CLARK-A1528-263  Machaeranthera tephrodes John C. Roos 1951-10-19 5330 Riverside San Jacinto River Comment
  UCR25221  Madia capitata John C. Roos 1957-6-28 6617 Sonoma Schellville 23 Comment
  POM262900  Madia elegans subsp. wheeleri J. C. Roos 1939-5-26 718 San Bernardino Bear Valley, San Bernardino Mts. Comment
  UCSB45559  Madia exigua Roos, John 1957-7-2 Sonoma Miller Ridge Comment
  POM266307  Madia glomerata J. C. Roos 1937-7-26 1937 San Bernardino Bear Valley, Pine Knot, San Bernardino Mts. Comment
  CLARK-A1528-1070  Madia minima John C. Roos 1937-6-5 1470 San Bernardino San Bernardino Mountains 1523 Comment
  RSA44235  Mahonia nevinii J. C. Roos 1949-7-12 3564 San Bernardino San Timoteo Canyon, south of Redlands 457 Comment
  CLARK-A1528-3232  Malacothamnus densiflorus John C. Roos 1960-6-5 San Bernardino Santa Ana Mountains 1066 Comment
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Dec 27 2017
  RSA78379  Malacothamnus fremontii J. C. Roos 1951-7-30 5072 Los Angeles Big Rock Creek, San Gabriel Mts. 1677 Comment
  RSA265797  Malacothamnus orbiculatus J. C. Roos 1942-11-28 2585 San Bernardino Deep Creek, at head of Hesperia s water flume; north side of San Bernardino Mts. 1037 Comment
  CLARK-A1528-2007  Malacothrix clevelandii John C. Roos 1954-5-15 6119 Riverside Reche Canyon 731 Comment
  UCR24138  Malacothrix clevelandii John C. Roos 1950-4-22 4756 Riverside 0.3 mi NE of summit of Reche Canyon 762 Comment
  CLARK-A1528-2010  Malacothrix saxatilis var. tenuifolia John C. Roos 1942-10-3 1739 Los Angeles Westwood Village Comment
  POM262904  Malaxis brachypoda J. C. Roos 1937-7-22 329 San Bernardino South Fork, Santa Ana River 2439 Comment
  UC1042990  Malosma laurina John and Lucille Roos 1954-7-10 6191 Riverside n. side Pigeon Pass; Box Springs Mts. 487 Comment
  POM262930  Malva nicaeensis J. C. Roos 1941-5-18 124 San Bernardino Loma Linda Comment
  UC1010242  Malva parviflora John and Lucille Roos 1951-5-5 5034 Riverside Riverside, Fairmont Park Fairmont Park; Riverside, Fairmont Park 274 Comment
  UCR26286  Malva parviflora John C. Roos 1951-11-10 5349 San Bernardino San Bernardino Valley, La Cadena Drive at Barton Road, south of Colton 30 Comment
  UCR23603  Malvella leprosa John C. Roos 1952-6-18 5776 Riverside Perris-Aguanga Basin region, 1 mi SE of Perris 427 Comment
  CAS-BOT-BC67842  Marsilea vestita John C. Roos 1952-5-21 5704 Riverside San Jacinto river bottomland 1 1/2 miles southeast of Perris 426 Comment
  RSA86902  Matthiola incana J. C. Roos 1950-8-19 4940 San Diego Torrey Pines Beach 6 Comment
  UCR25951  Matthiola incana John C. Roos 1937-6-16 s.n. San Diego South Coast, Del Mar Comment
  CLARK-A1528-3414  Meconella denticulata John C. Roos 1942-5-23 1069 Los Angeles San Gabriel Mountains 0 Comment
  CLARK-A1528-2857  Medicago lupulina John C. Roos 1954-5-31 Los Angeles Hollywood Comment
  UCR24034  Melica bulbosa John C. Roos 1942-6-26 1257 Mariposa 4 Mile Trail north of Yosemite Valley 2145 Comment
  LA102174  Melica californica John C. Roos; 1950-4-22 4754 Riverside Reche Canyon, 0.5 mi NE of the summit 792 Comment
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Feb 23 2014
  UCR25190  Melica californica John C. Roos 1951-5-27 5046 Mariposa Sierra Nevada Mtns., hills about 8 miles east of Mariposa 1006 Comment
  RSA78386  Melica californica var. nevadensis J. C. Roos 1951-5-27 5046 Mariposa Hills about 8 miles east of Mariposa. 1037 Comment
  CLARK-A1528-4723  Melica frutescens John C. Roos 1942-5-1 1157 Riverside Dry Morongo Canyon 548 Comment
  CLARK-A1528-4724  Melica frutescens John C. Roos 1952-4-9 5492 Riverside Riverside 396 Comment
  RSA85572  Melica frutescens J. C. Roos 1952-4-9 5492 Riverside Mt. Rubidoux 396 Comment
  CLARK-A1528-4728  Melica imperfecta John C. Roos 1937-4-21 Los Angeles Claremont Comment
  UCR25389  Melica imperfecta John C. Roos 1937-7-5 449 Ventura Wheeler Springs along Sespe Creek, north of Ojai 488 Comment
  CAS-BOT-BC281056  Melica stricta John Roos; Lucille Roos 1954-6-25 6154 Inyo N end Badger Flat, Inyo Mts 2682 Comment
  CLARK-A1528-4732  Melica stricta John C. Roos 1954-6-25 6154 Inyo Inyo Mountains Comment
  UCR19351  Melica stricta John C. Roos 1963-6-15 s.n. San Bernardino San Bernardino Mtns., Between Fish Creek and Heart Bar Creek 2195 Comment
  UCR26335  Melica stricta John C. Roos 1947-7-14 2856 Inyo Panamint Mtns., north slope of Baldy Peak 2591 Comment
  CLARK-A1528-2861  Melilotus albus John C. Roos 1965-7-3 Riverside Riverside Comment
  UCR23894  Melilotus albus John C. Roos 1942-9-26 1729 Los Angeles Westwood Village, Los Angeles 90 Comment
  UCR19128  Melissa officinalis John C. Roos 1948-4-28 3958 Sonoma North Coast Ranges, Healdsburg, Mill Creek - Barrell Spring Comment
  RSA301521  Menodora scoparia J. C. Roos 1937-6-8 1490 San Diego San Felipe Valley. Western edge of Colorado Desert. Comment
  CLARK-A1528-5350  Mentha arvensis John C. Roos 1952-8-6 5882 San Bernardino San Bernardino 304 Comment
  RSA69824  Mentha rotundifolia J. C. Roos 1951-10-2 5311 San Bernardino Loma Linda 320 Comment
  CLARK-A1528-3162  Mentzelia dispersa John C. Roos 1948-7-4 3897 Inyo Panamint Mountains 2560 Comment
  CLARK-A1528-3166  Mentzelia laevicaulis John C. Roos 1965-7-24 San Bernardino San Bernardino Mountains Comment
  RSA0126951  Mentzelia longiloba var. longiloba J. C. Roos, L. Roos 1949-4-7 4161 Imperial All America Canal, 5 miles SE of Niland Comment
  POM263281  Mentzelia veatchiana J. C. Roos 1937-3-25 543 Los Angeles 12 miles west of Lancaster Comment
  CAS-BOT-BC435232  Mesembryanthemum crystallinum J. C. Roos 1965-6-16 s.n. Orange Dana Point. Comment
  UCSB42141  Microsteris gracilis Roos, John 1966-4-9 San Bernardino North Shore; 2 miles east of Fawnskin-Bear Valley; San Bernardino Mtns Comment
  RSA444468  Mimulus aurantiacus var. puniceus Roos 1966-4-29 s.n. Riverside Rocky hills between March Air Force Base and Lakeview. Comment
  CLARK-A1528-861  Mimulus bigelovii John C. Roos 1941-4-12 195 Los Angeles Palmdale Comment
  UCR19077  Mimulus bigelovii var. bigelovii John C. Roos 1966-3-20 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mountains, 2 miles southeast of Desert Center 366 Comment
  CLARK-A1528-4231  Mimulus bigelovii var. cuspidatus John C. Roos, Lucille Roos 1952-7-31 5879 Inyo White Mountains 2438 Comment
  CLARK-A1528-4237  Mimulus brevipes John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  RSA450164  Mimulus cardinalis J. C. Roos 1965-9-11 s.n. San Bernardino Mill Creek. Comment
  POM301478  Mimulus floribundus J. C. Roos 1937-5-10 2330 Riverside Anual in moist spot in hills west of Perris. Comment
  RSA450075  Mimulus floribundus J. C. Roos 1952-4-29 5595 Riverside Pigeon, Box Springs Mts. 457 Comment
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May 21 2011
  CLARK-A1528-4251  Mimulus guttatus John C. Roos 1949-6-23 4472 San Bernardino Rock Springs 1462 Comment
  CLARK-A1528-866  Mimulus guttatus John C. Roos 1951-9-24 5241 San Bernardino Loma Linda Comment
  RSA450309  Mimulus guttatus J. C. Roos 1943-4-9 2614 San Bernardino Slong swampy ditch, Waterman Ave. Comment
  CLARK-A1528-4257  Mimulus lewisii John C. Roos 1937-8-8 2404 Inyo Lone Pine Canyon Comment
  RSA71393  Mimulus nanus var. mephiticus J. C. Roos, L. Roos 1951-8-11 5165 Mono East slope Sheep Mtn, White Mtns. 3354 Comment
  CLARK-A1528-4261  Mimulus palmeri John C. Roos 1937-5-24 2041 San Bernardino Deep Creek Comment
  POM301477  Mimulus parishii J. C. Roos 1937-7-16 2424 San Bernardino Upper Lytle Creek. Comment
  RSA444807  Mimulus pilosus J. C. Roos 1952-6-8 5745 Riverside Common along damp sunny bank with Helianthus gracilentus, etc., summit of Reche Canyon near Ferndale school. Comment
  RSA47417  Mimulus pilosus J. C. Roos, Lucille Roos 1949-6-21 4428 San Bernardino Sandy soil, southern exposure, New York Peak, eastern San Bernardino Co. 2256 Comment
  CLARK-A1528-4267  Mimulus primuloides John C. Roos 1960-7-4 Mono White Mountains Comment
  RSA659603  Mimulus primuloides J. C. Roos 1960-7-4 s.n. Mono Crooked Creek, White Mtns. Comment
  CLARK-A1528-4271  Mimulus puniceus John C. Roos 1966-4-29 Riverside Lakeview Comment
  RSA71737  Mimulus suksdorfii J. C. Roos, Lucille Roos 1952-7-28 5854 Inyo White Mountains; head of Wyman Canyon 3201 Comment
  RSA591744  Minuartia douglasii J. C. Roos 1952-5-26 5726 Riverside Reche Canyon. 427 Comment
  RSA44265  Mirabilis coccinea J. C. Roos 1949-6-22 3545 San Bernardino Mouth of Keystone Canyon, New York Mountains 1677 Comment
  RSA44266  Mirabilis coccinea J. C. Roos 1949-6-20 3546 San Bernardino Ivanpah Mountains, near Kokoweef Peak Comment
  POM262969  Mirabilis laevis var. crassifolia J. C. Roos 1941-4-25 162 San Bernardino Reche Canyon, San Bernardino Valley Comment
  POM265640  Mirabilis tenuiloba J. C. Roos 1937-6-10 1447 Imperial Coyote Wells, western edge of Colorado Desert. Comment
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Oct 9 2010
  UCR23611  Modiola caroliniana John C. Roos 1956-5-20 6582 San Bernardino San Bernardino Valley, 114 Taylor St., Loma Linda 396 Comment
  RSA85154  Mohavea breviflora J. C. Roos, Lucille Roos 1954-3-27 6049 Inyo Mud Canyon, Death Valley. 244 Comment
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Aug 26 2014
  CLARK-A1528-4225  Mohavea confertiflora John C. Roos 1937-4-28 1287 Riverside Desert Center Comment
  UCR25379  Mohavea confertiflora John C. Roos 1949-3-26 4126 Riverside Sonoran (Colorado) Desert, Mouth of Shaver's Wash [= Box Canyon], east of Mecca 61 Comment
  CLARK-A1528-5529  Monanthochloe littoralis John C. Roos 1937-6-13 1450 San Diego Imperial Beach Comment
  CLARK-A1528-5234  Monardella lanceolata John C. Roos 1936-8-15 576 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3146  Monardella linoides John C. Roos 1965-1-11 Inyo Panamint Mountains Comment
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Apr 25 2019
  POM274232  Monardella linoides J. C. Roos 1947-7-12 2836 Inyo Thorndyke s Ranch, Wildrose Canyon, Panamint Mt. Range Comment
  UCR19082  Monardella linoides subsp. linoides John C. Roos 1946-9-14 3009 Riverside Santa Rosa Mountains, Taylor, desert slope on Palms to Pines Highway 1098 Comment
  UCR23567  Monardella odoratissima John C. Roos 1966-9-3 s.n. San Bernardino San Bernardino Mtns, along a rocky ridge between upper Fish Creek and North Fork Whitewater meadows 2988 Comment
  UCR25682  Monardella odoratissima John C. Roos, A. R. Roos 1953-8-9 5951 Inyo Inyo Mtns, Tamarack Canyon 2744 Comment
  CLARK-A1528-4884  Monardella odoratissima subsp. australis John C. Roos 1937-7-20 1177 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3152  Monardella odoratissima subsp. parvifolia John C. Roos, Lucille Roos 1952-7-27 5828 Inyo White Mountains 3108 Comment
  RSA71723  Monardella odoratissima subsp. parvifolia J. C. Roos 1952-7-27 5828 Inyo West rim of Reed Flat, White Mtns. 3110 Comment
  UCR30513  Monardella villosa John C. Roos 1937-7-4 335 Santa Barbara Lower Cuyama Valley Comment
  CLARK-A1528-2586  Monolepis nuttalliana John C. Roos 1949-4-8 4200 Imperial Palo Verde Valley Comment
  UCR19022  Monolepis nuttalliana John C. Roos, L. Roos 1952-7-28 5852 Inyo White Mountains, roadside at head of Wyman Canyon 3140 Comment
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May 8 2011
  UCR30582  Monolepis nuttalliana John C. Roos 1966-3-1 s.n. Riverside Perris basin, San Jacinto River bottom at Perris. Comment
  RSA658694  Monolepis nuttalliana J. C. Roos 1949-4-8 4200 Imperial South of Palo Verde. Comment
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Aug 28 2016
  CLARK-A1528-2015  Monolopia lanceolata John C. Roos 1937-3-26 2477 Kern Comment
  UCR25775  Monoptilon bellidiforme John C. Roos 1937-4-23 781 San Bernardino Southern Mojave Desert, Twentynine Palms 762 Comment
  UC1010187  Montia chamissoi John and Lucille Roos 1951-8-10 5133 Mono White Mountains, McAfee Meadow McAfee Meadow; White Mountains, McAfee Meadow 3657 Comment
  RSA71691  Montia chamissoi J. C. Roos 1952-7-30 5862 Mono Crooked Creek, White Mts. 2744 Comment
  POM302530  Muhlenbergia andina J. C. Roos 1943-11-6 2746 San Bernardino Upper Mill Creek 2134 Comment
  RSA658426  Muhlenbergia andina J. C. Roos 1965-9-11 s.n. San Bernardino At the quarry in Mill Creek Canyon, San Bernardino Mountains Comment
  CLARK-A1528-4746  Muhlenbergia arsenei John C. Roos, Alfred R. Roos 1950-8-5 4896 San Bernardino Clark Mountain Range 1737 Comment
  UC1023414  Muhlenbergia arsenei J. C. and A. R. Roos 1950-8-5 4896 San Bernardino 1 1/2 mi. s.w. Coliseum Mine; Mojave Desert, Clark Mts. 1737 Comment
  CLARK-A1528-76  Muhlenbergia asperifolia John C. Roos 1951-9-25 5257 Riverside Riverside 259 Comment
  RSA78219  Muhlenbergia californica J. C. Roos 1951-7-30 5075 Los Angeles Big Rock creek, north of Mt. Baden Powell, San Gabriel Mountains. Alt. 6500 ft. Comment
  UCR25117  Muhlenbergia californica John C. Roos 1951-7-30 5075 Los Angeles San Gabriel Mtns., Big Rock Creek, north of Mt. Baden Powell 1982 Comment
  GH355759  Muhlenbergia porteri J. C. Roos 1955-5-13 6341 Unknown west base of Last Chance Mts., east of Eureka Valley sand dunes. 1219 Comment
  SD52952  Muhlenbergia porteri John C. Roos, A. R. Roos 1955-8-25 6546 Inyo Loretto road, 1 mile west of Loretto Mine, east slope Inyo Mts. 1584 Comment
  CLARK-A1528-4762  Muhlenbergia richardsonis Alfred R. Roos 1937-8-19 10679 Riverside San Jacinto Mountains Comment
  POM266637  Muhlenbergia rigens J. C. Roos 1937-7-23 2397 Santa Barbara Los Olivos Comment
  UCR19373  Muhlenbergia rigens John C. Roos 1965-6-30 s.n. Riverside Santa Ana Mtns., Ortega Hwy Comment
  UCR30809  Nama californica John C. Roos 1949-7-23 4579 San Bernardino San Bernardino Mtns., Holcomb Valley Comment
  UCR23564  Nama demissa John C. Roos 1966-3-26 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mountains, 2 mi SE of Desert Center 366 Comment
  UCR25803  Nama depressa John C. Roos, L. Roos 1952-5-10 5635 San Bernardino Western Mojave Desert, 4 mi. northwest of Adelanto, near Red Raven Mine 823 Comment
  UCR26302  Nama hispida John C. Roos 1949-4-8 4197 Imperial Sonoran (Colorado) Desert, Milpitas Wash. Comment
  CLARK-A1528-5061  Nama hispida var. spathulata John C. Roos 1949-4-9 4203 Riverside Desert Center 274 Comment
  CLARK-A1528-2983  Nama stenocarpa John C. Roos 1952-5-28 5728 Riverside Perris 426 Comment
  CLARK-A1528-2984  Nama stenocarpa John C. Roos 1951-10-19 5327 Riverside San Jacinto Valley 457 Comment
  CLARK-A1528-5488  Nama stenocarpa John C. Roos 1951-10-19 5327 Riverside San Jacinto Valley 457 Comment
  CLARK-A1528-3448  Navarretia atractyloides John C. Roos 1952-6-14 5769 San Bernardino Yucaipa 914 Comment
  UCSB42147  Navarretia atractyloides Roos, John; Roos, Lucille 1952-6-14 San Bernardino in Yucaipa Comment
  CLARK-A1528-3449  Navarretia breweri John C. Roos, Lucille Roos 1952-7-28 5855 Inyo White Mountains 3200 Comment
  UCR24246  Navarretia hamata John C. Roos, L. Roos 1952-6-14 5769 San Bernardino San Bernardino Mtns. foothills/San Bernardino Valley, Yucaipa, abandoned grain field 915 Comment
  UCR24248  Navarretia hamata subsp. leptantha Alfred R. Roos 1941-6-14 s.n. Orange Corona del Mar 91 Comment
  POM263049  Navarretia peninsularis J. C. Roos 1937-7-26 340 San Bernardino Bear Valley, Pine Knot. Comment
  OBI36027  Navarretia squarrosa John C. Roos 1950-7-22 4878 Sonoma 2 miles east of Duncan Mills 61 Comment
  UCR19196  Navarretia squarrosa John C. Roos 1950-7-20 4863 San Francisco San Francisco Bay Region, San Francisco City College 91 Comment
  RSA659774  Nemacladus glanduliferus var. orientalis J. C. Roos 1949-4-9 4205 San Bernardino Roadside NW of Cross Roads, Whipple Mtns. Comment
  UCR31680  Nemacladus longiflorus var. longiflorus John C. Roos 1947-3-15 3343 Riverside Peninsular Range; San Jacinto Valley/ San Jacinto Mtns. Foothills, 1 mile east of Valle Vista 549 Comment
  UCR25988B  Nemacladus sigmoideus John C. Roos 1947-3-15 3354 B Riverside Sonoran (Colorado) Desert, Santa Rosa Mountains, mouth of Deep Canyon at foot of mtns. 366 Comment
  SEINET10460866  Nemacladus sigmoideus Roose 1952-5-10 ROOSE 5634 San Bernardino 853 Comment
  A37211  Nitrophila mohavensis J. C. Roos & A. R. Roos 1954-6-13 6140 Unknown Open flats of Amargosa Desert 3 miles northeast of Death Valley Junction along Ash Meadows road, 2050 feet Comment
  NY32586  Nitrophila mohavensis J. C. Roos 1954-7-18 6194 Inyo This specimen represents an endangered or threatened species. The specific locality has been removed from this record to protect this species from over-collection. These data may be supplied to researchers on request. Comment
  RSA89532  Nitrophila mohavensis J. C. Roos 1954-5-7 6079 Inyo Amargosa Desert 3 miles NE of Death Valley Junction along Ash Meadows road 625 Comment
  SD50072  Nitrophila mohavensis John C. Roos 1954-7-18 6194 Inyo Amargosa Desert 3.0 miles northeast of Death Valley Junction along Ash Meadows road. 625 Comment
  UC1010485  Nitrophila mohavensis J. C. Roos and A. R. Roos 1954-6-13 6140 Inyo along Ash Meadows road 3 mi ne Death Valley Junction; Amorgosa Desert; Amargosa Desert, NE of Death Valley, Inyo Co. 624 Comment
  UC1494265  Nitrophila mohavensis J. C. Roos and A. R. Roos 1954-6-13 6140 Inyo along Ash Meadows road 3 mi ne Death Valley Junction; Amorgosa Desert; Amargosa Desert, NE of Death Valley, Inyo Co. 624 Comment
  CLARK-A1528-1497  Nolina parryi subsp. wolfii John C. Roos, Lucille Roos 1952-10-18 5904 Riverside Little San Bernardino Mountains 1219 Comment
  CLARK-A1528-3582  Notholaena newberryi John C. Roos 1937-5-2 1412 Riverside La Sierra Comment
  CLARK-A1528-3569  Notholaena parryi John C. Roos, Lucille Roos 1955-4-6 6295 Inyo Saline Valley 502 Comment
  CLARK-A1528-3568  Notholaena sinuata var. cochisensis John C. Roos 1949-5-29 3532 San Bernardino Clark Mountain 1462 Comment
  POM264312  Oenanthe sarmentosa J. C. Roos 1937-6-6 660 San Bernardino San Bernardino. Comment
  RSA47544  Oenothera avita subsp. avita J. C. Roos, L. Roos 1949-6-22 4450 San Bernardino New York Mountains; Keystone Canyon 1738 Comment
  CLARK-A1528-3300  Oenothera avita subsp. eurekensis John C. Roos, Alfred R. Roos 1955-4-9 6318 Inyo Eureka Valley 944 Comment
  CLARK-A1528-3347  Oenothera californica John C. Roos 1937-5-19 2058 San Bernardino Comment
  CLARK-A1528-5355  Oenothera heterochroma subsp. monoensis John C. Roos, Alfred R. Roos 1954-8-14 6213 Inyo Inyo Mountains 2316 Comment
  CLARK-A1528-3351  Oenothera hookeri John C. Roos 1946-10-5 3106 San Bernardino San Bernardino Mountains 1356 Comment
  UCR23341  Onychium densum John C. Roos 1938-12-10 286 Napa North Coast Range, Blake's Canyon, Pacific Union College, Angwin Comment
  CLARK-A1528-2361  Opuntia basilaris John C. Roos 1937-4-18 Riverside Snow Creek Comment
  POM263142  Oreonana vestita J. C. Roos 1937-7-16 390 Los Angeles Mt. San Antonio [Los Angeles-San Bernardino County line] 2744 Comment
  CLARK-A1528-1347  Orobanche cooperi John C. Roos 1948-5-15 3848 Riverside Eagle Mountains Comment
  UCR23523  Orobanche fasciculata John C. Roos 1947-3-8 3317 San Bernardino San Bernardino Mountains, Deep Creek 1159 Comment
  RSA0059180  Orobanche fasciculata John C. Roos 1937-6-15 1466 San Diego Public Camp, south of Cuyamaca Lake. Comment
  RSA0066490  Orobanche parishii John C. Roos 1937-7-4 1611 Santa Barbara Upper Cuyama Valley, near Wagy Ranch. Comment
  CLARK-A1528-5740  Orthocarpus John C. Roos 1937-7-2 469 b Santa Barbara Comment
  CLARK-A1528-4280  Orthocarpus attenuatus John C. Roos 1937-6-14 4 San Diego Comment
  CLARK-A1528-4772  Oryzopsis hymenoides Alfred R. Roos 1937-4-18 2397 Riverside Snow Creek Comment
  CLARK-A1528-5583  Oryzopsis hymenoides John C. Roos 1938-4-18 8717 Inyo Death Valley National Park Comment
  RSA0080081  Oryzopsis hymenoides A. R. Roos 1937-4-18 s.n. Riverside Snow Creek. Comment
  CLARK-A1528-1283  Oryzopsis micrantha John C. Roos, R. Weatherby 1949-9-2 3571 San Bernardino Kingston Range 2163 Comment
  CLARK-A1528-1284  Oryzopsis miliacea John C. Roos, Lucille Roos 1953-11-29 6043 San Luis Obispo San Luis Obispo 91 Comment
  UCR19346  Oryzopsis webberi John C. Roos 1958-4-5 s.n. Inyo Inyo Mountains, near Badger Flats Comment
  CLARK-A1528-5701  Oxalis corniculata John C. Roos 1949-11-18 4697 San Bernardino San Bernardino Valley Comment
  CLARK-A1528-3284  Oxybaphus coccineus John C. Roos 1949-6-20 3546 San Bernardino Kokoweed Peak 1523 Comment
  CLARK-A1528-3751  Oxyria digyna John C. Roos 1951-8-10 5150 Mono White Mountains 4023 Comment
  RSA662419  Oxystylis lutea J. C. Roos 1965-7-11 s.n. Inyo Amargosa River at Eagle Mountain, south of Death Valley Junction. 610 Comment
  CLARK-A1528-1128  Oxystylis lutea John C. Roos 1965-7-11 Inyo Eagle Mountain 609 Comment
  CAS-BOT-BC413264  Oxytheca dendroidea subsp. dendroidea J. C. Roos 1955-7-23 6504 Inyo Soldier Flat, east base Waucoba Mountain, Inyo Mountains 2194 Comment
  UC1042985  Oxytheca dendroidea subsp. dendroidea John and Lucille Roos 1954-6-27 6166 Inyo flats 1.5 mi e Andrews Mtn.; Inyo Mts. 2545 Comment
  CLARK-A1528-3757  Oxytheca parishii John C. Roos 1965-7-17 San Bernardino San Bernardino Mountains Comment
  RSA450148  Oxytheca parishii var. parishii J. C. Roos 1965-10-2 s.n. San Bernardino Camp Angelus, San Bernardino Mtns. Comment
  CLARK-A1528-3761  Oxytheca perfoliata John C. Roos 1965-6-16 San Bernardino Comment
  UC1234664  Oxytropis borealis var. australis J. C. and A. R. Roos 1955-8-26 6557 Inyo summit Waucoba Mt.; Inyo Mtns. 3383 Comment
  CAS-BOT-BC202199  Oxytropis parryi John Roos; Lucille Roos 1951-8-10 5160 Mono 1 mile north of Sheep Mtn., White Mts. 3627 Comment
  CAS-BOT-BC317013  Packera multilobata John C. Roos; L. Roos 1951-8-8 5101 Mono White Mts., Big Prospector Meadow 3200 Comment
  CLARK-A1528-5815  Paeonia brownii John C. Roos, Lucille Roos 1952-3-1 5381 Riverside San Timoteo Canyon 518 Comment
  UCR24014  Panicum alatum var. minus John C. Roos 1965-9-5 s.n. Riverside Sonoran (Colorado) Desert, 18 mi. west of Blythe 122 Comment
  RSA153104B  Panicum capillare J. C. Roos, E. C. Jaeger 1955-7-23 6518 Inyo Saline Valley below mouth of Hunter Canyon 351 Comment
  RSA648670  Panicum capillare J. C. Roos 1946-9-6 2997 San Bernardino Warm Creek south of San Bernardino. Comment
  RSA69872  Panicum capillare J. C. Roos 1951-9-25 5255 Riverside Fairmount Park 259 Comment
  CLARK-A1528-4784  Panicum hirticaule John C. Roos 1965-9-5 Riverside Comment
  UCR23249  Panicum miliaceum John C. Roos 1958-5-10 s.n. San Bernardino San Bernardino Valley, 204 Tulip, Loma Linda Comment
  CLARK-A1528-4788  Panicum urvilleanum John C. Roos 1737-4-28 1283 Riverside Whitewater Comment
  CAS-BOT-BC274183  Pappostipa speciosa J. C. Roos 1965-6-13 s.n. Riverside East of Hemet Comment
  CLARK-A1528-1341  Parietaria floridana John C. Roos 1949-4-6 4152 Imperial Chocolate Mountains Comment
  CLARK-A1528-4389  Parietaria floridana John C. Roos, Lucille Roos 1955-4-6 6297 Inyo Inyo Mountains 502 Comment
  CLARK-A1528-4390  Parietaria floridana John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  UCR24392  Parnassia cirrata John C. Roos 1965-9-11 s.n. San Bernardino San Bernardino Mtns, quarry near Mill Creek 2073 Comment
  UCR23701  Parvisedum pumilum John C. Roos 1939-4-18 296 Napa North Coast Range, Deer Lake. [near] Pacific Union College, Angwin 610 Comment
  CLARK-A1528-4789  Paspalum dilatatum John C. Roos 1949-11-16 4696 San Bernardino Loma Linda 323 Comment
  CLARK-A1528-4790  Paspalum dilatatum John C. Roos 1947-5-11 3605 Los Angeles Los Angeles Comment
  POM301691  Paspalum dilatatum J. C. Roos 1942-10-1 1736 Los Angeles North Boyle and Brooklyn Ave. Comment
  UCR24139  Pectis papposa John C. Roos, L. Roos 1961-10-21 s.n. Inyo Northern Mojave Desert, Eureka Valley Comment
  UCR18795  Pectocarya linearis John C. Roos 1948-4-10 3785 San Bernardino San Bernardino Valley, SW of Loma Linda Comment
  RSA450446  Pectocarya penicillata J. C. Roos 1966-4-5 s.n. Riverside Winchester Comment
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Mar 20 2011
  UCR23545  Pectocarya penicillata John C. Roos 1966-4-5 s.n. Riverside Hills near Winchester Comment
  POM262899  Pedicularis semibarbata J. C. Roos 1939-5-26 716 San Bernardino Bluff Lake. Comment
  POM263092  Pedicularis semibarbata J. C. Roos 1937-7-15 387 San Bernardino Stockton Flats, San Gabriel Mountains. Comment
  NY802603  Pediomelum castoreum J. C. Roos 1952-5-10 5642 San Bernardino 4 miles northwest of Adelanto, near Red Haven Mine 823 Comment
  POM261207  Pellaea breweri J. C. Roos 1941-8-17 44 Inyo Panamint Mountains: 3048 Comment
  CLARK-A1528-4298  Penstemon caesius John C. Roos 1965-7-17 San Bernardino San Bernardino Mountains 2438 Comment
  CLARK-A1528-4299  Penstemon calcareus John C. Roos, Lucille Roos 1954-5-8 6102 Inyo Grapevine Mountains 1310 Comment
  UC1080615  Penstemon calcareus John C. Roos 1955-5-13 6344 Inyo e Eureka Valley sand dunes (w base Last Chance Mts.); , e of Eureka Valley sand dunes 1310 Comment
  RSA44238  Penstemon eatonii subsp. undosus J. C. Roos 1949-5-29 3527 San Bernardino Edge of rocky was, north slope of Clark Mountain 1646 Comment
  RSA71751  Penstemon floridus J. C. Roos, L. Roos 1952-7-28 5838 Inyo Wyman Canyon, White Mts. 2591 Comment
  RSA40599  Penstemon fruticiformis J. C. Roos 1947-7-15 2867 Inyo Rocky slope of canyon bottom, Wildrose Canyon. Panamint Mts. 1677 Comment
  UCR23262  Penstemon fruticiformis John C. Roos 1947-4-20 3518 Inyo Northern Mojave Desert, Panamint Mtns: Emigrant Pass 1555 Comment
  CLARK-A1528-4303  Penstemon grinnellii John C. Roos 1965-7-17 San Bernardino San Bernardino Mountains Comment
  RSA71790  Penstemon heterodoxus subsp. heterodoxus J. C. Roos, L. Roos 1951-8-8 5096 Mono Big Prospector Meadow, White Mountains. 3201 Comment
  CLARK-A1528-4309  Penstemon heterophyllus John C. Roos 1937-6-15 631 San Diego Cuyamaca Lake Comment
  OBI30458  Penstemon heterophyllus J. C. Roos 1947-5-17 3632 Los Angeles Placerita Cyn Comment
  POM263245  Penstemon heterophyllus J. C. Roos 1937-6-15 631 San Diego Near Cuyamaca Lake, Cuyamaca Mountains. Comment
  UC1236264  Penstemon monoensis John C. Roos 1955-5-16 6389 Inyo Waucoba road 7 mi e Big Pine (w side Inyo Mts.); , e of Big Pine 1615 Comment
  CAS-BOT-BC243398  Penstemon scapoides John Roos; Lucille Roos 1952-7-28 5853 Inyo Wyman Canyon, White Mts. 2743 Comment
  NY651577  Penstemon scapoides J. C. Roos 1953-8-8 5936 Inyo Hill behind Blue Bell Mine, Badger Flat, Inyo Mountains 2743.2 Comment
  UC1010332  Penstemon scapoides J. C. and A. R. Roos 1953-8-8 5936 Inyo hill behind Blue Bell Mine (Badger Flat); Inyo Mts., Badger Flat 2743 Comment
  UCR19059  Penstemon scapoides John C. Roos, L. Roos 1952-7-28 5853 Inyo White Mtns., Wyman Canyon 2744 Comment
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Dec 6 2011
  CLARK-A1528-4316  Penstemon speciosus John C. Roos 1958-7-5 Inyo Inyo Mountains Comment
  RSA155666  Penstemon speciosus J. C. Roos 1955-6-17 6402 Inyo 2 miles NE of Willow Springs, Last Chance Mountains. 2012 Comment
  RSA71748  Penstemon speciosus J. C. Roos, L. Roos 1952-7-27 5834 Inyo Ridge at S. E. rim Reed Flat, White Mountains. 3171 Comment
  RSA71709  Peraphyllum ramosissimum J. C. Roos, L. Roos 1952-7-31 5880 Inyo NW of Cedar Flat, White Mountain 2439 Comment
  HSC78589  Pericome caudata J. C. Roos 1956-8-29 6595 Inyo Head of Death Valley Canyon, Panamint Mtns. Comment
  UC1494260  Pericome caudata J. C. Roos 1956-8-29 6595 Inyo Death Valley Canyon, at the head Panamint Mtns. Comment
  UCD134879  Pericome caudata J. C. Roos 1956-8-29 6595 Inyo at the head of Death Valley Canyon in the Panamint Mountains. Comment
  CLARK-A1528-5375  Perityle megalocephala John C. Roos, Alfred R. Roos 1954-8-14 6217 Inyo Inyo Mountains 2179 Comment
  CAS-BOT-BC328113  Perityle megalocephala var. megalocephala J. C. Roos; A. R. Roos 1953-8-10 5979 Inyo Mazourka Canyon, Inyo Mountains 2499 Comment
  RSA79708  Perityle megalocephala var. megalocephala J. C. Roos 1953-8-8 5938 Inyo Blue Bell Mine, Badger flat, Inyo Mountains 2744 Comment
  CLARK-A1528-5340  Perityle megalocephala var. oligophylla John C. Roos 1953-8-10 5979 Inyo Inyo Mountains 2499 Comment
  CAS-BOT-BC419365  Persicaria punctata J. C. Roos 13 September s.n. San Bernardino Victorville. Mojave River bottom Comment
  CLARK-A1528-3172  Petalonyx linearis John C. Roos 1949-6-2 4150 Riverside Chocolate Mountains Comment
  UCR19125  Petalonyx thurberi Alfred R. Roos 1948-9-15 s.n. Los Angeles Transverse Range/Mojave Desert, Mint Canyon, south of Palmdale Comment
  UCR19126  Petalonyx thurberi John C. Roos 1965-6-23 s.n. Riverside Sonoran (Colorado) Desert, Eagle Mtns, Lost Palms Wash Comment
  UCR18906  Petrophytum caespitosum John C. Roos 1948-9-18 4043 San Bernardino Eastern Mojave Desert, Clark Mountain 1982 Comment
  CLARK-A1528-1203  Petunia parviflora John C. Roos 1937-6-7 514 Riverside Comment
  CLARK-A1528-2030  Peucephyllum schottii John C. Roos 1947-2-15 3247 Riverside Eagle Mountains Comment
  POM264088  Phacelia brachyloba J. C. Roos 1937-6-7 669 Riverside South of Sage. Comment
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Oct 7 2014
  CLARK-A1528-2995  Phacelia cicutaria John C. Roos 1965-6-19 Riverside Santa Ana Mountains Comment
  UCSB42177  Phacelia cicutaria var. hispida Roos, John 1965-6-19 Riverside Sky Line Drive, south of Corona, Santa Ana Mtns. Comment
  CLARK-A1528-5436  Phacelia crenulata John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  RSA0110944  Phacelia curvipes J. C. Roos 1955-6-17 6417 Inyo Two miles northeast of Willow Springs, Last Chance Mountains. 2012 Comment
  UC1236239  Phacelia distans John C. Roos 1955-5-15 6367 Inyo 0.5 mi w Willow Spring; Last Chance Mts. 1767 Comment
  POM263547  Phacelia fremontii J. C. Roos 1937-3-25 680 Los Angeles 20 miles E of Palmdale Comment
  CLARK-A1528-3010  Phacelia minor John C. Roos 1947-3-21 3374 Riverside Reche Canyon Comment
  POM263135  Phacelia minor J. C. Roos 1941-3-8 205 San Bernardino Reche Canyon. Comment
  CLARK-A1528-5077  Phacelia mutabilis John C. Roos 1937-7-22 684 San Bernardino San Bernardino Mountains Comment
  RSA425017  Phacelia parryi J. C. Roos 1962-4-7 s.n. San Diego Moosa Canyon near Bonsall. Comment
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Aug 8 2014
  CLARK-A1528-5080  Phacelia parryi John C. Roos 1941-4-25 161 San Bernardino San Bernardino Comment
  UCR23724  Phacelia perityloides John C. Roos 1955-4-6 6287 Inyo Northern Mojave Desert, mouth of Beveridge Canyon, east side of Inyo Mtns. 671 Comment
  UCSB42180  Phacelia ramosissima Roos, John 1965-6-27 San Bernardino Loma Linda Hills 304 Comment
  CAS-BOT-BC154420  Phacelia ramosissima var. latifolia J. C. Roos 1965-6-27 s.n. San Bernardino Loma Linda Hills. 304 Comment
  UC1236256  Phacelia rotundifolia John C. Roos 1955-5-13 6327 Inyo e Eureka Valley sand dunes; west base Last Chance Mts. 1158 Comment
  POM263275  Phacelia viscida J. C. Roos 1937-7-7 404 Los Angeles On earth fill, La Crescenta Comment
  CLARK-A1528-4795  Phalaris lemmonii John C. Roos 1940-6-11 1913 Marin Novato Comment
  POM301698  Phalaris lemmonii J. C. Roos 1940-6-11 1913 Marin junction of Highway 37 and 10, north of San Rafael Comment
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Jun 10 2015
  UCR24037  Phalaris lemmonii John C. Roos 1940-6-11 1913 Marin San Francisco Bay Region, Junction of Hyws 101 and 37, north of San Rafael 1 Comment
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Jun 10 2015
  CLARK-A1528-4803  Phalaris minor John C. Roos 1952-4-21 5564 San Bernardino Loma Linda 304 Comment
  POM263105  Phalaris minor J. C. Roos 1937-5-10 431 Orange Tustin Comment
  RSA85489  Phalaris minor J. C. Roos 1952-4-21 5564 San Bernardino Loma Linda 305 Comment
  UC1043020  Phalaris paradoxa John C. Roos 1952-5-21 5702 Riverside 1 1/2 mi se Perris; San Jacinto River bottomland 426 Comment
  UCR19277  Phalaris paradoxa John C. Roos 1952-5-21 5702 Riverside Perris-Aguanga Basin region, San Jacinto River bottomland 1.5 mi. SE of Perris. 427 Comment
  UCR19222  Philadelphus microphyllus subsp. stramineus John C. Roos, L. Roos 1952-7-28 5843 Inyo White Mtns, Wyman Canyon 2683 Comment
  SEINET218257 Image available Philadelphus microphyllus var. stramineus John Roos 1941-1 46 Inyo Panamint Mts. East slope of Mt. Baldy. Comment
  CLARK-A1528-4804  Phleum alpinum John C. Roos 1937-7-22 1173 San Bernardino South Fork Meadows Comment
  UCR19287  Phleum alpinum John C. Roos 1965-7-31 s.n. San Bernardino San Bernardino Mtns, South Fork Meadows on the upper Santa Ana River in the San Gorgonio Wilderness Area 2622 Comment
  RSA659633  Phleum pratense J. C. Roos 1965-7-18 s.n. San Bernardino Moonridge, Bear Valley, San Bernardino Mountains. Comment
  CLARK-A1528-3453  Phlox dolichantha John C. Roos 1949-7-16 4564 San Bernardino San Bernardino Mountains 2224 Comment
  RSA74568  Phlox pulvinata J. C. Roos 1951-8-10 5141 Mono Saddle 1 mile SE of White Mountain Peak. 3963 Comment
  CLARK-A1528-3454  Phlox stansburyi John C. Roos, Lucille Roos 1952-7-27 5837 Inyo White Mountains Comment
  CLARK-A1528-5106  Pholistoma membranaceum John C. Roos 1937-4-18 San Diego Jacumba Comment
  CLARK-A1528-4421  Phoradendron longispicum John C. Roos 1952-3-26 5420 Riverside Riverside 259 Comment
  CLARK-A1528-4812  Phragmites australis John C. Roos 1965-9-22 San Bernardino Victorville Comment
  CLARK-A1528-4967  Phyllodoce breweri John C. Roos 1941-6-5 109 San Bernardino Mount San Gorgonio 2895 Comment
  CLARK-A1528-4427  Phyllospadix torreyi John C. Roos 1960-8-27 Orange Dana Point Comment
  CLARK-A1528-4356  Physalis acutifolia John C. Roos 1965-9-5 Riverside Blythe Comment
  RSA444461  Physalis crassifolia Roos 1965-6-23 s.n. Riverside Lost Palms Wash. Comment
  CLARK-A1528-4362  Physalis hederifolia var. cordifolia John C. Roos 1948-9-18 4070 San Bernardino Clark Mountain 1615 Comment
  POM262872  Physalis philadelphica J. C. Roos 1940-10-26 220 San Bernardino Loma Linda. Comment
  UC1010211  Physalis pubescens var. grisea J. C. and A. R. Roos 1954-8-15 6221 Inyo below mouth of Hunter Canyon (Saline Valley); Saline Valley 365 Comment
  CAS-BOT-BC140538  Physocarpus alternans J. C. Roos 1965-7-10 s.n. Inyo Eagle Springs, Panamint Mtns. Comment
  CLARK-A1528-4014  Physocarpus alternans John C. Roos 1965-7-10 Inyo Panamint Mountains Comment
  UCSB37793  Physocarpus alternans Roos, John 1965-7-10 Inyo Eagle Springs, Panamint Mtns Comment
  UC1010299  Picradeniopsis multiflora John C. Roos 1950-9-1 4955 San Bernardino Coliseum Mine, e Mohave Desert Mohave Desert, Clark Mts. 1615 Comment
  CLARK-A1528-279  Picris echioides John C. Roos 1951-9-25 5280 Riverside Riverside 259 Comment
  CLARK-A1528-3841  Pilostyles thurberi John C. Roos 1963-6-1 Imperial Comment
  SBBG54105  Pilostyles thurberi J. C. Roos 1960-6-1 Imperial 0.6 mi SE of San Felipe wash bridge near Kane Spring -54 Comment
  RSA450183  Pinus albicaulis J. C. Roos 1965-8-9 s.n. Inyo Heart Lake, Independence Creek. Comment
  CLARK-A1528-3549  Pinus flexilis John C. Roos 1947-7-13 2818 Inyo Panamint Mountains 3352 Comment
  CLARK-A1528-3626  Pinus flexilis John C. Roos 1947-7-14 2816 Inyo Panamint Mountains 2621 Comment
  CAS-BOT-BC73061  Pinus longaeva John Roos; Lucille Roos 1947-7-13 2819 Inyo Telescope Peak, Panamint Mts. 3322 Comment
  CAS-BOT-BC78816  Pinus longaeva J. C. Roos; A. R. Roos 1953-8-9 5956 Inyo upper end Tamarack Canyon, Inyo Mts. 3048 Comment
  RSA72077  Pinus longaeva J. C. Roos, Lucille Roos 1951-8-12 5186 Inyo Reed Flat, White Mountains 3171 Comment
  CLARK-A1528-3558  Pinus monophylla John C. Roos 1948-9-18 4072 San Bernardino Clark Mountain 1737 Comment
  UCR19274  Pinus monophylla John C. Roos 1965-7-10 s.n. Inyo Northern Mojave Desert, Death Valley National Monument. Trail to Telescope Peak near Mahogany Flat 2500 Comment
  CLARK-A1528-3559  Pinus monophylla John C. Roos 1947-7-14 2817 Inyo Panamint Mountains 2468 Comment
  UCR23372  Pinus ponderosa John C. Roos 1947-5-31 3669 Los Angeles San Gabriel Mountains, Big Pines 2134 Comment
  CAS-BOT-BC72839  Pinus quadrifolia J. C. Roos 1965-8-18 s.n. Riverside Summit of Pines to Palm Hwy., Thomas Valley, San Jacinto Mtns. Comment
  RSA450184  Pinus quadrifolia J. C. Roos 1965-8-18 s.n. Riverside Summit of Pines to Palm Hwy., Thomas Valley, San Jacinto Mtns. Comment
  UCR19284  Pinus quadrifolia John C. Roos 1947-4-5 3436 Riverside San Jacinto Mtns., Head of Thomas Valley 1463 Comment
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Oct 25 2011
  UCR19348  Piptatherum miliaceum John C. Roos, L. Roos 1953-11-29 6043 San Luis Obispo San Luis Obispo. Polytechnic College Campus 91 Comment
  CAS-BOT-BC254443  Piptatherum miliaceum John Roos; Lucille Roos 1953-11-29 6043 San Luis Obispo Near chicken pens, California Polytechnic College campus, San Luis Obispo 91 Comment
  CAS-BOT-BC254444  Piptatherum miliaceum John Roos; Lucille Roos 1953-11-29 6043 San Luis Obispo Near chicken pens, California Polytechnic College campus, San Luis Obispo 91 Comment
  CLARK-A1528-3591  Pityrogramma triangularis John C. Roos 1936-11-21 Riverside La Sierra Comment
  CLARK-A1528-3805  Pityrogramma triangularis John C. Roos 1949-6-27 4521 San Bernardino Kingston Range 1645 Comment
  HSC78529  Plagiobothrys canescens J. C. Roos 1966-3-24 Riverside Winchester Comment
  UCR25420  Plagiobothrys canescens John C. Roos 1952-4-30 5605 Riverside Peninsular Range, hills between Camp Haan and Riverside 534 Comment
  RSA85111  Plagiobothrys nothofulvus J. C. Roos 1952-4-16 5559 Riverside Box Springs Mountains, Pigeon Pass. 396 Comment
  CAS-BOT-BC228481  Plagiobothrys parishii J. C. Roos 1949-4-30 4270 San Bernardino Rabbit Spr., Lucerne Valley 883 Comment
  RSA45208  Plagiobothrys parishii J. C. Roos, L. Roos 1949-4-30 4270 San Bernardino Rabbit Springs 884 Comment
  UCR25923  Plagiobothrys salsus John C. Roos, L. Roos 1954-5-7 6075 Inyo Amargosa Desert, 3 mi NE of Death Valley Junction, on Ash Meadows Road 625 Comment
  RSA78328  Plagiobothrys torreyi J. C. Roos 1951-6-9 5062 San Bernardino Running Springs 1829 Comment
  CLARK-A1528-3433  Plantago aristata John C. Roos 1950-6-11 4831 San Bernardino Loma Linda 304 Comment
  CLARK-A1528-3434  Plantago erecta John C. Roos 1937-3-5 1300 Riverside La Sierra Comment
  CLARK-A1528-693  Plantago hirtella subsp. galeottiana John C. Roos, Lucille Roos 1951-9-29 5309 San Bernardino San Bernardino 304 Comment
  POM251760  Plantago indica J. C. Roos 1937-11-1 6 San Bernardino Blue Jay Camp. San Bernardino Mts. Comment
  CLARK-A1528-3422  Plantago major John C. Roos 1950-5-13 4806 San Bernardino Rabbit Springs 883 Comment
  CLARK-A1528-697  Plantago major John C. Roos 1951-9-25 5274 Riverside Riverside 259 Comment
  UCR24220  Plantago patagonica John C. Roos 1949-6-22 4439 San Bernardino Eastern Mojave Desert, New York Mtns., at and near Lecyr Well 1524 Comment
  UCR26252  Plantago patagonica John C. Roos 1940-5-11 853 San Bernardino San Bernardino Mtns., Mill Creek, just below bridge 1372 Comment
  POM301485  Plantago virginica J. C. Roos 1937-6-13 1709 San Diego San Isidro Comment
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May 24 2009
  UCSB42165  Plantago virginica Roos, A. 1938-6-12 San Bernardino Loma Linda Comment
  UCR19154  Platanthera sparsiflora John C. Roos 1949-7-4 4542 San Bernardino San Bernardino Mtns., Vivian Creek 2165 Comment
  CLARK-A1528-3419  Platanus racemosa John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  POM263492  Plectritis ciliosa subsp. insignis J. C. Roos 1939-3-27 263 Napa Pope Valley Comment
  CAS-BOT-BC326720  Pleiacanthus spinosus John C. Roos 1947-7-11 2902 Inyo Mahogany Flats, Panamint Mts. 2438 Comment
  RSA44253  Pleuraphis jamesii J. C. Roos 1949-5-29 3538 San Bernardino Clark Mountains: Coliseum Mine Comment
  RSA92061  Pleuraphis jamesii J. C. Roos 1954-5-8 6095 Inyo Grapevine Mountains above Leadfield 1584 Comment
  CLARK-A1528-1104  Pleurocoronis pluriseta John C. Roos 1946-10-26 3141 Riverside Chuckwalla Mountains 487 Comment
  RSA648065  Pleurocoronis pluriseta J. C. Roos 1946-10-26 3141 Riverside Chuckwalla Mtns. Comment
  RSA450752  Pluchea odorata J. C. Roos 1965-10-10 s.n. San Diego Otay Lake Comment
  UCSB42185  Pluchea odorata Roos, John 1965-10-10 San Diego Otay Lake Comment
  CLARK-A1528-4980  Pluchea sericea John C. Roos 1947-1-26 3214 Inyo Death Valley National Park Comment
  POM263407  Poa atropurpurea J. C. Roos 1939-5-26 714 San Bernardino Bluff Lake, near foot of trail to Castle Rock Comment
  CLARK-A1528-7825  Poa fendleriana John C. Roos 1937-7-28 415 San Bernardino San Bernardino Mountains Comment
  POM261201  Poa fendleriana J. C. Roos 1941-5-30 104 San Bernardino Mouth of Coon Creek, San Bernardino Mts. Comment
  CAS-BOT-BC246628  Poa howellii J. C. Roos; L. Roos 1957-6-1 6613 San Bernardino Yucaipa Ridge, 0.5 miles S.W. of Mill Creek Public Camp, Mill Creek, San Bernardino Mtns. Comment
  UCR24067  Poa howellii John C. Roos, L. Roos 1957-6-1 6613 San Bernardino San Bernardino Mtns., Yucaipa Ridge, 0.5 mi south of Mill Creek Public Camp, Mill Creek Comment
  UCR26338  Poa howellii John C. Roos 1939-6-24 918 San Bernardino San Bernardino Mtns., Sawpit Canyon, south of Cedar Springs 1159 Comment
  CAS-BOT-BC247402  Poa pratensis J. C. Roos 1965-7-18 s.n. San Bernardino At Moonridge in Bear Valley, San Bernardino Mountains Comment
  CLARK-A1528-4828  Poa pratensis John C. Roos 1952-5-7 5622 Riverside Edgemont 487 Comment
  CLARK-A1528-4829  Poa pratensis John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  UCR24020  Poa pratensis John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Moonridge, Bear Valley 2226 Comment
  UCR25361  Poa pratensis John C. Roos 1952-5-7 5622 Riverside Flats at Edgemont 488 Comment
  CLARK-A1528-4836  Poa scabrella John C. Roos 1937-5-1 Riverside Badlands Comment
  LA102211  Poa secunda John C. Roos; 1947-4-26 3694 San Bernardino San Bernardino Mountains, Mill Creek Canyon, near Igo's Comment
  POM266337  Poa secunda J. C. Roos 1940-5-11 847 San Bernardino Mill Creek, San Bernardino Mts 1372 Comment
  SEINET3222768 Image available Poa secunda John Roos, Lucille Roos 1950-4-26 4764 San Bernardino Rabbit Springs, Mojave Desert. 880 Comment
  UCR19665  Poa secunda John C. Roos 1950-2-25 4710 Riverside Pass between Reche Canyon and Pigeon Pass Road 457 Comment
  UCR24017  Poa secunda John C. Roos 1937-3-26 s.n. Kern 4 mi SW of Maricopa Comment
  UCR23626  Pogogyne serpylloides John C. Roos 1939-4-29 291 Napa North Coast Range, Pacific Union College, Angwin 549 Comment
  NY963358  Polemonium chartaceum J. C. Roos 1951-8-10 5148 Mono white Mountain Peak, White Mountains 4298 Comment
  UCR26200  Polemonium chartaceum John C. Roos 1960-7-4 s.n. Mono White Mtns, 'Crooked Creek' [but probably actually from White Mtn. Peak, and now mapped along the trail below the peak] 4345 Comment
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Jul 24 2016
  UCR24245  Polemonium occidentale John C. Roos 1947-6-27 3723 San Bernardino San Bernardino Mountains, South Fork of Santa Ana River 2439 Comment
  CLARK-A1528-2256  Polycarpon tetraphyllum John C. Roos 1952-8-27 5887 San Bernardino San Bernardino Valley 335 Comment
  CLARK-A1528-5335  Polycarpon tetraphyllum John C. Roos 1952-8-27 5887 San Bernardino San Bernardino Valley 335 Comment
  UCR23713  Polycarpon tetraphyllum John C. Roos 1942-5-23 1061 Los Angeles Monrovia, 300 block on E Lime St. 179 Comment
  UCR23537  Polygala acanthoclada John C. Roos 1949-6-20 4420 San Bernardino Eastern Mojave Desert, Keystone Cannyon, near Barnwell, New York Mtns 1348 Comment
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Nov 6 2014
  CLARK-A1528-3771  Polygonum amphibium var. emersum John C. Roos 1937-7-27 1964 San Bernardino San Bernardino Mountains 2042 Comment
  RSA450087  Polygonum amphibium var. stipulaceum J. C. Roos 1966-9-10 s.n. San Bernardino Big Bear Lake. Comment
  UCR30823  Polygonum argyrocoleon John C. Roos 1937-6-9 2252 Imperial Sonoran (Colorado) Desert, Westmorland, Imperial Valley -43 Comment
  UC1010233  Polygonum aviculare subsp. aviculare John C. Roos 1953-3-31 5911 San Bernardino Loma Linda 320 Comment
  CLARK-A1528-3777  Polygonum bistortoides John C. Roos 1965-8-21 Fresno Comment
  CLARK-A1528-3780  Polygonum bistortoides John C. Roos 1937-7-22 1168 San Bernardino San Bernardino Mountains Comment
  POM263103  Polygonum kelloggii J. C. Roos 1937-7-27 327 San Bernardino Near Grout Bay, Bear Valley. Comment
  RSA69863  Polygonum lapathifolium J. C. Roos, Lucille Roos 1951-9-11 5200 San Bernardino Loma Linda. 320 Comment
  RSA0051251  Polypogon monspeliensis John C. Roos 1952-4-23 5576 Riverside West side of Box Springs Mts. above Canyon Crest Heights. 457 Comment
  RSA664198  Polypogon monspeliensis J. C. Roos 1939-5-13 s.n. San Bernardino La Sierra. Comment
  CLARK-A1528-4842  Polypogon semiverticillatus John C. Roos 1942-9-12 1718 Los Angeles Westwood Comment
  UCSB51282  Polypogon viridis Roos, John 1965-6-12 San Bernardino Igo's near Mountain Home Village and Mill Creek; San Bernardino Mtns. Comment
  CAS-BOT-BC102750  Populus tremuloides John Roos; Lucille Roos 1952-7-30 5872 Mono Crooked Creek, White Mts. 3078 Comment
  LA102304  Populus tremuloides J. C. Roos; 1965-6-26 sn San Bernardino San Bernardino Mountains, Fish Creek, near Barton Flats Comment
  CLARK-A1528-4064  Populus trichocarpa John C. Roos 1946-9-28 3095 San Bernardino San Bernardino Mountains 2255 Comment
  CLARK-A1528-4063  Populus trichocarpa var. ingrata John C. Roos 1936-8-15 563 San Bernardino San Bernardino Mountains 1981 Comment
  UCR19541  Porophyllum gracile John C. Roos 1950-5-6 4789 Riverside Santa Ana Mtns., Tin Mine Canyon 488 Comment
  UCR26321  Potamogeton pusillus John C. Roos 1937-7-28 16 San Bernardino San Bernardino Mtns, Holcomb Valley 2256 Comment
  UCR23514  Potentilla biennis John C. Roos 1937-8-5 1025 Inyo White Mtns., White Mtns. Comment
  LA102307  Potentilla gracilis J. C. Roos; 1937-7-26 338 San Bernardino San Bernardino Mountains, Bear Valley, Pine Knot ( now city of Big Bear ) Comment
  CLARK-A1528-4018  Potentilla gracilis subsp. nuttallii John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  RSA450249  Potentilla gracilis var. elmeri J. C. Roos 1965-7-18 s.n. San Bernardino Moonridge, Bear Valley, San Bernardino Mountains. Comment
  CLARK-A1528-4019  Potentilla propinqua John C. Roos, Lucille Roos 1952-7-30 5875 Mono White Mountains 3078 Comment
  CLARK-A1528-4022  Potentilla saxosa John C. Roos 1942-5-1 1151 San Bernardino Joshua Tree National Monument Comment
  UCR19201  Primula suffrutescens John C. Roos 1965-8-9 s.n. Inyo Sierra Nevada Mountains, Heart Lake, Independence Creek area 3300 Comment
  UCR23652  Proboscidea parviflora var. hohokamiana John C. Roos, E. C. Jaeger 1955-7-23 6516 Inyo Northern Mojave Desert, Saline Valley, below mouth of Hunter Canyon 351 Comment
  CLARK-A1528-2867  Prosopis chilensis var. glandulosa John C. Roos 1952-7-16 5814 Riverside San Timoteo Canyon 441 Comment
  CLARK-A1528-2871  Prosopis pubescens John C. Roos 1947-4-20 3504 Inyo Death Valley Comment
  UCSB42201  Prosopis pubescens Roos, John 1965-7-11 Inyo Warm Springs, Furnace Creek, Death Valley Comment
  UCR26122  Prunus John C. Roos 1950-2-25 4708 San Bernardino San Bernardino Valley, Santa Ana River wash at Orange St. bridge north of Redlands 396 Comment
  CAS-BOT-BC159760  Prunus andersonii J. C. Roos 1955-6-20 6457 Inyo Near Willow Spring, Last Chance Mountains 1828 Comment
  UCSB37382  Prunus emarginata Roos, John 1965-7-18 San Bernardino Snow Valley, San Bernardino Mtns Comment
  RSA47538  Prunus fasciculata J. C. Roos, L. Roos 1949-6-18 4391 San Bernardino Southeastern base of Clark Mountain, eastern Mojave Desert. 1829 Comment
  CLARK-A1528-4033  Prunus fremontii John C. Roos 1937-4-18 San Diego Jacumba Comment
  CLARK-A1528-4034  Prunus ilicifolia John C. Roos 1940-5-4 Riverside San Timoteo Canyon Comment
  UCR26088  Psathyrotes annua John C. Roos 1949-6-26 4498 San Bernardino Eastern Mojave Desert, 2 mi south of Kingston 793 Comment
  RSA47448  Pseudostellaria jamesiana J. C. Roos, L. Roos 1949-7-16 4552 San Bernardino Moonridge, Bear Valley 2226 Comment
  CLARK-A1528-2070  Psilostrophe cooperi John C. Roos 1937-8-25 2024 San Bernardino East Mojave Desert Comment
  CLARK-A1528-5672  Psoralea physodes John C. Roos 1960-5-30 Riverside Santa Ana Mountains 1219 Comment
  CLARK-A1528-5067  Psoralea rigida John C. Roos 1943-7-4 2725 San Bernardino San Bernardino Mountains Comment
  UCR25914  Psoralea rigida John C. Roos 1949-7-16 4546 San Bernardino San Bernardino Mtns., near Greenspot, Bear Valley 2134 Comment
  UC1236254  Psorothamnus arborescens var. minutifolius John C. Roos 1955-5-13 6332 Inyo west base Last Chance Mountains, E of Eureka Valley sand dunes 1158 Comment
  UCR23938  Psorothamnus fremontii John C. Roos 1955-5-13 6332 Inyo Northern Mojave Desert, west base of Last Chance Mountains, east of Eureka Valley sand dunes 1280 Comment
  RSA92339  Psorothamnus polydenius J. C. Roos, L. Roos 1954-6-28 6178 Inyo North base of sand dunes at SE end of Eureka Valley 915 Comment
  UCSB42194  Psorothamnus schottii Roos, John 1966-5-2 Riverside At the mouth of Pushawalla Canyon, Indio Mtns. Comment
  UCR19292  Puccinellia nuttalliana John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Big Bear Valley along the lake 2058 Comment
  LA102371  Pulicaria paludosa John C. Roos; 1965-6-23 Riverside Palm Springs Comment
  UC1236248  Purshia mexicana var. stansburyana John C. Roos 1955-5-13 6342 Inyo e of Eureka Valley sand dunes (w base of Last Chance Mountains); Last Chance Mountains 1219 Comment
  CAS-BOT-BC143786  Purshia stansburyana John C. Roos 1955-5-13 6342 Inyo West base Last Chance Mts. east of Eureka Valley sand dunes 1219 Comment
  UCR18932  Purshia stansburyana John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Panamint Mtns, Mahogany Flats 2470 Comment
  UC1010198  Pyrrocoma apargioides John and Lucille Roos 1951-8-11 5169 Mono Campito Meadow White Mts. 3322 Comment
  CLARK-A1528-2904  Quercus X morehus John C. Roos 1947-4-26 3598 San Bernardino San Bernardino Mountains Comment
  UCR18973  Quercus X morehus John C. Roos 1946-9-1 2980 San Bernardino San Bernardino Mtns, Oak Glen Comment
  RSA35731  Quercus X morehus J. C. Roos 1946-11-6 5394 San Bernardino Oak Glen, San Bernardino Mts. 1220 Comment
  CLARK-A1528-1176  Quercus agrifolia John C. Roos 1946-9-1 2984 San Bernardino Wildwood Canyon Comment
  RSA450193  Quercus agrifolia A. R. Roos 1937-12-15 s.n. Los Angeles Sepulveda Canyon Comment
  UCR23863  Quercus agrifolia Alfred R. Roos 1937-12-15 s.n. Los Angeles Western Transverse Range; Santa Monica Mtns., Sepulveda Canyon 350 Comment
  SEINET13953046 Image available Quercus agrifolia J. C. Roos 1965-1 San Bernardino Hills near summit of Pine to Palms Highway, San Jacinto and Santa Rosa Mountains Comment
  CLARK-A1528-5327  Quercus chrysolepis John C. Roos 1949-6-22 4455 San Bernardino New York Mountains elevations 1737-2256 Comment
  POM266352  Quercus garryana var. breweri J. C. Roos 1939-7-6 1516 Shasta Hills north of Redding. 1372 Comment
  UCR18945  Quercus lobata John C. Roos 1946-11-23 3157 Los Angeles Transverse Range, Placerita Canyon [in Santa Clarita] Comment
  CLARK-A1528-2903  Quercus lobata John C. Roos 1937-7-3 1929 Santa Barbara Lower Cuyama Valley Comment
  SEINET13953263 Image available Quercus palmeri J. C. Roos 1965-1 Riverside Summit of Pines to Palms Road (Hwy 74) south of Palm Desert, Santa Rosa and San Jacinto Mountains. Comment
  LA102298  Quercus turbinella John C. Roos; 1949-8-13 4621 San Bernardino New York Mountains, Keystone Canyon, near Copper Queen Mine 1828 Comment
  UC1010217  Quercus turbinella John and Lucille Roos 1949-6-21 4430 San Bernardino Keystone Canyon New York Mts. 1767 Comment
  RSA47311  Quercus turbinella subsp. turbinella J. C. Roos 1949-6-22 4452 San Bernardino New York Mountains; Keystone Canyon 1738 Comment
  UCR23860  Quercus wislizeni John C. Roos 1965-8-21 s.n. Tulare Sierra Nevada Mtns., Middle Fork of Kaweah River Canyon, west of Sequoia National Forest Comment
  CLARK-A1528-2912  Quercus wislizeni John C. Roos 1965-8-21 Tulare Kaweah River Comment
  POM262922  Quercus wislizeni var. frutescens J. C. Roos 1937-8-11 481 Kern Tehachapi Pass Comment
  RSA92599  Rafinesquia californica J. C. Roos, Lucille Roos 1952-5-11 5649 San Bernardino Scott's Canyon, 2.5 miles southeast of Loma Linda. 427 Comment
  UCR26099  Rafinesquia neomexicana John C. Roos 1948-4-24 3802 Riverside Eastern San Bernardino Mtns./Sonoran (Colorado) Desert, Whitewater Wash 549 Comment
  POM261196  Raillardella argentea J. C. Roos 1941-8-27 34 San Bernardino San Gorgonio Ridge, San Bernardino Mountains 3476 Comment
  UCR18908  Ranunculus aquatilis John C. Roos 1937-7-28 s.n. San Bernardino San Bernardino Mtns, Holcomb Valley 2043 Comment
  POM265651  Reseda odorata J. C. Roos 1937-8-31 2563 San Diego Oceanside Comment
  CLARK-A1528-3908  Rhamnus californica subsp. cuspidata John C. Roos 1949-6-19 4405 San Bernardino Clark Mountain Range 1950 Comment
  UCR23453  Rhamnus ilicifolia John C. Roos, Lucille Roos 1949-4-23 4284 Riverside Sonoran (Colorado) Desert, Eagle Mtns., Munsen Canyon Comment
  CLARK-A1528-3909  Rhamnus pilosa John C. Roos 1937-6-14 531 San Diego Alpine Comment
  RSA47204  Rhamnus tomentella subsp. ursina J. C. Roos, L. Roos 1949-6-19 4405 San Bernardino southeastern base of Clark Mts, eastern San Bernardino Co. 1951 Comment
  CLARK-A1528-1413  Rhus integrifolia John C. Roos 1949-10-22 4693 San Bernardino Santa Ana River 396 Comment
  CLARK-A1528-5595  Rhus integrifolia John C. Roos 1950-2-18 4707 Riverside Box Springs Mountains 774 Comment
  CLARK-A1528-1414  Rhus laurina John C. Roos 1954-7-10 6191 Riverside Box Springs Mountains 487 Comment
  CLARK-A1528-2406  Rhus trilobata John C. Roos 1948-5-15 3831 Riverside Eagle Mountains Comment
  CLARK-A1528-4125  Ribes cereum John C. Roos 1941-8-17 26 Inyo Panamint Mountains Comment
  CLARK-A1528-6881  Ribes indecorum John C. Roos 1946-12-27 3194 Riverside Box Springs Mountains Comment
  RSA664942  Ribes indecorum J. C. Roos 1946-12-27 3194 San Bernardino Reche Canyon. Comment
  CLARK-A1528-4137  Ribes montigenum John C. Roos 1942-7-1 1251 Mariposa Yosemite Comment
  POM302497  Ribes montigenum J. C. Roos 1943-7-4 2715 San Bernardino Sugarloaf Peak, San Bernardino mts. 2896 Comment
  POM265675  Ribes quercetorum J. C. Roos 1937-6-8 1649 San Diego Mouth of Canyon above Warner Hot Springs. Comment
  CLARK-A1528-4151  Ribes speciosum John C. Roos 1962-5-6 Orange Santa Ana Mountains Comment
  POM261194  Ribes velutinum J. C. Roos 1941-8-17 60 Inyo Trail to Telescope Peak, Panamint Mts. 2652 Comment
  UCR19140  Ribes velutinum John C. Roos, L. Roos 1954-6-26 6164 Inyo Northern Mojave Desert, Inyo Mtns, Mazourka Canyon 2439 Comment
  UCR19224  Ribes velutinum John C. Roos 1949-6-27 4503 San Bernardino Eastern Mojave Desert, Kingston Mountains 1982 Comment
  CLARK-A1528-4157  Ribes viburnifolium John C. Roos 1966-2-26 Los Angeles Claremont Comment
  CLARK-A1528-2711  Ricinus communis John C. Roos 1937-9-5 2554 San Bernardino Loma Linda Comment
  UCR23436  Rorippa sphaerocarpa John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Bear Valley Comment
  CAS-BOT-BC422177  Rumex californicus J. C. Roos 1965-7-17 s.n. San Bernardino Dry Lake, San Bernardino Mtns. Comment
  CLARK-A1528-3798  Rumex fueginus John C. Roos 1937-6-17 1232 San Diego San Luis Rey Comment
  CLARK-A1528-3799  Rumex hymenosepalus John C. Roos 1966-4-29 Riverside Lakeview 457 Comment
  POM265698  Rumex salicifolius var. crassus J. C. Roos 1942-9-12 1743 Los Angeles Northwest of Santa Monica. Comment
  RSA450154  Rumex salicifolius var. denticulatus J. C. Roos 1965-7-17 s.n. San Bernardino Dry Lake, San Bernardino Mtns. Comment
  CLARK-A1528-1001B  Rumex triangulivalvis John C. Roos 1937-7-29 1982 San Bernardino Bluff Lake 2316 Comment
  CLARK-A1528-5727  Ruta graveolens John C. Roos 1948-2-21 3771 Riverside Reche Canyon 457 Comment
  RSA450476  Salazaria mexicana J. C. Roos 1965-6-13 s.n. Riverside Santa Rosa Mountains: Dos Palmas Springs. Comment
  CLARK-A1528-4053  Salix exigua John C. Roos 1937-4-26 618 San Bernardino Providence Mountains Comment
  UCR26182  Salix exigua John C. Roos 1947-2-15 3244 Riverside Sonoran (Colorado) Desert, Lost Palms Canyon, south face of Eagle Mtns., west of Hayfield Dry Lake 997 Comment
  UCR30597  Salix gooddingii John C. Roos, A. R. Roos 1950-8-7 s.n. Inyo Northern Mojave Desert, China Ranch near Tecopa Pass 427 Comment
  CLARK-A1528-4054  Salix hindsiana var. leucodendroides John C. Roos 1937-5-23 617 Riverside Riverside Comment
  RSA85092  Salix lasiolepis J. C. Roos 1952-4-4 5469 San Bernardino Warm Creek bottomland at Colton. 290 Comment
Read comments
Dec 3 2014
  UCR23756  Salpichroa origanifolia John C. Roos 1965-6-29 s.n. San Bernardino San Bernardino Valley, Bloomington 354 Comment
  CAS-BOT-BC403762  Salpichroa origanifolia J. C. Roos 1965-6-29 s.n. San Bernardino Bloomington Comment
  RSA79486  Salsola tragus J. C. Roos, A. Roos 1953-8-13 6008 Inyo Tamarack Canyon. 2744 Comment
  CLARK-A1528-3108  Salvia clevelandii John C. Roos, Lucille Roos 1950-8-19 4943 San Diego Torrey Pines Park Comment
  CLARK-A1528-3109  Salvia dorrii John C. Roos 1947-2-22 3288 San Bernardino San Bernardino Mountains Comment
  CAS-BOT-BC220787  Salvia dorrii var. dorrii J. C. Roos 1955-7-21 6488 Inyo Whitetop Peak, summit Last Chance Mountains 2560 Comment
  LA69886  Salvia dorrii var. pilosa John C. Roos; Lucille Roos 1952-7-30 5859 Inyo White Mountains, E side Reed Flat 3078 Comment
  RSA85131  Salvia funerea J. C. Roos 1954-3-27 6057 Inyo Titus Canyon below Klare Spring, Grapevine Mts. Death Valley. 915 Comment
  CLARK-A1528-3116  Salvia greatae John C. Roos 1963-11-2 Riverside Orocopia Mountains Comment
  RSA171386  Salvia greatae J. C. Roos 1963-9-9 s.n. Riverside Desert wash at Salt Creek Wash. 152 Comment
  UCR23625  Salvia leucophylla John C. Roos 1940-5-25 1901 San Bernardino San Bernardino Valley, at mouth of Santa Ana River, above Highland Comment
  CLARK-A1528-3123  Salvia mohavensis John C. Roos 1947-2-15 3234 Riverside Eagle Mountain Comment
  CLARK-A1528-3124  Salvia mohavensis John C. Roos 1949-6-25 4495 San Bernardino Clark Mountains 1645 Comment
  CLARK-A1528-4961  Salvia mohavensis John C. Roos 1949-6-24 4476 San Bernardino Clark Mountain 1676 Comment
  UCR25754  Salvia mohavensis John C. Roos 1946-11-2 3156 San Bernardino Mojave Desert, Wash NW of Lone Star Ranch [Yucca Valley?; the site of a gas station north of Joshua Tree Nat. Mon.] Comment
  UCR26240  Salvia pachyphylla John C. Roos 1946-8-27 2914 Riverside Peninsular Range, Santa Rosa Mtns 2287 Comment
  UCR26299  Salvia pachyphylla John C. Roos 1949-6-19 4406 San Bernardino Eastern Mojave Desert, SE foot of Clark Mountain 1951 Comment
  UCR18778  Salvia vaseyi John C. Roos 1948-5-8 3825 Riverside San Bernardino Mtns, Whitewater 579 Comment
  CLARK-A1528-2413  Sambucus microbotrys John C. Roos 1965-8-9 Inyo Sierra Nevada Range Comment
  UCR19084  Sambucus racemosa John C. Roos 1965-8-9 s.n. Inyo Sierra Nevada Mountains, moraine at Gilbert Lake, near Kearsarge Pass 3178 Comment
  CAS-BOT-BC328143  Sanvitalia abertii J. C. Roos; A. R. Roos 1950-8-5 4893 San Bernardino 1 mile south of Coliseum Mine, Clark Mountains, eastern Mohave Desert 1645 Comment
  CAS-BOT-BC328144  Sanvitalia abertii John Roos 1950-9-1 4954 San Bernardino Near Coliseum Mine, Clark Mountains, eastern Mohave Desert 1645 Comment
  RSA52783  Sanvitalia abertii J. C. Roos 1950-8-5 4893 San Bernardino 1 mi S of Coliseum Mine, Clark Mtns. 1646 Comment
  UCR28722  Saponaria officinalis John C. Roos 1948-9-2 4019 Siskiyou Hills just north of Shasta City. Comment
  UCSB42183  Sarcodes sanguinea Roos, John 1966-6-15 Los Angeles N slope of Mount Baden-Powell near Laurel Spring, San Gabriel Mtns. 2377 Comment
  CLARK-A1528-1468  Sarcostemma cynanchoides John C. Roos 1940-8-20 906 Riverside Reche Canyon Comment
  CLARK-A1528-1469  Sarcostemma hirtellum John C. Roos 1937-4-18 Riverside Colorado Desert Comment
Read comments
Mar 3 2014
  RSA648742  Schedonorus pratensis J. C. Roos 1950-5-20 4815 San Bernardino Central St., San Bernardino Valley. 304 Comment
  UCSB51363  Schismus barbatus Roos, John 1965-6-6 San Bernardino Mill Creek near Fallsvale, San Bernardino Mtns. Comment
  UCR20373  Schoenoplectus americanus John C. Roos, L. Roos 1952-6-10 5762 Riverside San Bernardino Valley Region, Fairmont Park in Riverside, edge of lake 259 Comment
  UCR18886  Scopulophila rixfordii John C. Roos, L. Roos 1954-5-8 6097 Inyo Northern Mojave Desert, Grapevine Mountains, Titus Canyon, below Leadfield 1372 Comment
  CLARK-A1528-2458  Scopulophila rixfordii John C. Roos, Lucille Roos 1954-5-8 6097 Inyo Grapevine Mountains 1371 Comment
  CLARK-A1528-2459  Scopulophila rixfordii John C. Roos 1955-4-8 6313 Inyo Last Chance Range 1219 Comment
  RSA96598  Scopulophila rixfordii J. C. Roos 1954-9-19 20181 Inyo Gorge where Loretto Rd. pulls out of Canyon, N Inyo Mts. 1616 Comment
  RSA40585  Scrophularia californica var. desertorum J. C. Roos 1947-7-13 2892 Inyo East slope Baldy Peak, Panamint Mts. Comment
  RSA79499  Scrophularia californica var. desertorum J. C. Roos, A. R. Roos 1953-8-14 6026 Inyo Al Rose Canyon, Inyo Mts. 2500 Comment
  RSA592489  Sedum niveum J. C. Roos 1965-7-31 s.n. San Bernardino South fork. 2134 Comment
  CLARK-A1528-4074  Selaginella asprella John C. Roos 1937-5-9 2090 San Bernardino Oak Glen Comment
  CLARK-A1528-4079  Selaginella watsonii John C. Roos 1937-7-22 1165 San Bernardino Mount San Gorgonio Comment
  UCR23324  Senecio astephanus John C. Roos, L. Roos 1952-6-14 5771 San Bernardino San Bernardino Mtns., Mill Creek south of Mill Creek Public Camp 1159 Comment
  UCR34453  Senecio canus John C. Roos, L. Roos 1954-6-24 6147 Inyo Inyo Mtns., 1 mi east of Blue Bell Mine 2866 Comment
  CLARK-A1528-2081  Senecio douglasii John C. Roos 1965-7-21 San Bernardino Cajon Pass Comment
  CLARK-A1528-2087  Senecio mohavensis John C. Roos 1949-4-10 4223 Riverside Chuckwalla Mountains Comment
  UCR34450  Senecio scorzonella John C. Roos 1948-9-7 4009 Tuolumne Sierra Nevada Mtns, Yosemite National Park, NE of Tuolumne Meadows 2744 Comment
  RSA0013675  Senecio spartioides J. C. Roos, P. Roos 1966-9-13 s.n. San Bernardino Ridge between headwaters of Fish Creek and North Fork meadows. Comment
  CLARK-A1528-2092  Senecio triangularis John C. Roos 1946-9-4 2941 San Bernardino High Creek 2804 Comment
  UCR25861  Senna armata John C. Roos 1937-4-23 779 San Bernardino Southern Mojave Desert, Twentynine Palms 762 Comment
  UCR23416  Sesuvium verrucosum John C. Roos 1955-7-24 6524 Inyo Owens Valley/Eastern Sierra Nevada, south end Owens Lake, 0.5 mi. east of Olancha 1100 Comment
  CAS-BOT-BC438164  Sesuvium verrucosum J. C. Roos 1955-7-24 6524 Inyo 0.5 mile east of Olancha at south end Owens Lake. 1097 Comment
  UCR31319  Setaria parviflora John C. Roos 1951-9-23 5240 San Bernardino San Bernardino Valley, 2 miles west of Loma Linda 305 Comment
  UCR31318  Setaria pumila John C. Roos 1951-9-23 5239 San Bernardino San Bernardino Valley, 2 miles west of Loma Linda 305 Comment
  CLARK-A1528-5536  Setaria verticillata John C. Roos 1965-8-5 San Bernardino Loma Linda Comment
  RSA89904  Setaria verticillata J. C. Roos 1952-5-14 5660 Riverside Scattered locally along edge of irrigated orchard with Echinochloa, Crusgalli, etc., corner of Iowa and 8th Street east of Riverside. 305 Comment
  UCD92866  Setaria viridis J. C. Roos 1937-7-12 1503 San Bernardino Loma Linda. Comment
  LA102261  Sidalcea neomexicana John C. Roos; 1950-5-13 4805 San Bernardino Lucerne Valley, Rabbit Springs 883 Comment
  UCR23679  Silene californica John C. Roos 1957-6-29 6618 Sonoma North Coast Ranges, Fitch Mtn, near Healdsburg 59 Comment
  UCR23654  Silene conoidea John C. Roos 1967-4-30 s.n. San Bernardino San Bernardino Valley, Loma Linda 396 Comment
  CLARK-A1528-2468  Silene lemmonii John C. Roos 1941-6-1 93 San Bernardino San Bernardino Mountains Comment
Read comments
Feb 20 2015
  CLARK-A1528-2469  Silene parishii John C. Roos 1966-8-6 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4895  Silene verecunda subsp. platyota John C. Roos 1941-8-17 59 Inyo Panamint Mountains 2590 Comment
  CLARK-A1528-5642  Sisymbrium murale John C. Roos 1943-4-11 2603 San Bernardino San Bernardino County Hospital Comment
  RSA69822  Solanum americanum J. C. Roos, L. Roos 1951-9-29 5308 San Bernardino Warm Creek near south E street, San Bernardino. 305 Comment
  CLARK-A1528-892  Solanum douglasii John C. Roos 1951-9-25 5296 Riverside Riverside 259 Comment
  UCR19143  Solanum elaeagnifolium John C. Roos 1952-6-5 5737 San Bernardino San Bernardino Valley, Loma Linda 457 Comment
  UCR19241  Solanum elaeagnifolium John C. Roos 1965-7-29 s.n. Riverside San Gorgonio Pass, Banning, along RR track Comment
  CLARK-A1528-5186  Solanum nigrum John C. Roos 1937-11-25 493 San Bernardino Patton Comment
  RSA44908  Solanum rostratum J. C. Roos 1947-9-3 3742 San Bernardino San Bernardino Valley along the Gage Canal in Loma Linda 305 Comment
  CLARK-A1528-4372  Solanum sarrachoides John C. Roos, Lucille Roos 1953-6-29 5925 Riverside Cherry Valley 975 Comment
  CLARK-A1528-5025  Solanum triflorum John C. Roos 1937-6-7 1453 San Diego Aquanea Comment
  CLARK-A1528-1208  Solanum xanti var. montanum John C. Roos 1937-7-27 1969 San Bernardino San Bernardino Mountains Comment
  UCR25378  Solidago californica John C. Roos 1949-8-13 4603 San Bernardino Eastern Mojave Desert, Copper Queen Mine, Keystone Canyon, New York Mtns 1829 Comment
  CAS-BOT-BC365330  Solidago confinis J. C. Roos 1946-9-21 3043 San Bernardino Lucerne Valley in the southern Mojave Desert. Box S Spring 1082 Comment
  CLARK-A1528-1060  Solidago confinis John C. Roos 1937-7-27 1971 San Bernardino San Bernardino Mountains Comment
  RSA71390  Solidago multiradiata J. C. Roos, Lucille Roos 1951-8-10 5162 Mono Northeast face of Sheep Mountain, White Mountains. 3506 Comment
  UCR24169  Solidago occidentalis John C. Roos 1946-10-2 s.n. San Bernardino San Bernardino Valley, south of San Bernardino 305 Comment
  CLARK-A1528-2103  Soliva sessilis John C. Roos 1953-5-9 5916 Riverside Riverside 259 Comment
  UCR19714  Soliva sessilis John C. Roos, L. Roos 1953-5-9 5916 Riverside Riverside, Fairmont Park 259 Comment
  UCR26160  Sonchus oleraceus John C. Roos 1949-10-1 4686 Orange South Coast, Doheny Beach 0 Comment
  CLARK-A1528-5278  Sorghum halepense Alfred R. Roos 1941-6-15 San Diego San Diego Comment
  CLARK-A1528-94  Sorghum halepense John C. Roos 1951-10-2 5313 San Bernardino Loma Linda 320 Comment
  CLARK-A1528-5254  Sorghum sudanense Alfred R. Roos 1936-11-11 Riverside Riverside 243 Comment
  UCR24107  Sparganium eurycarpum John C. Roos 1943-4-27 2628 San Bernardino San Bernardino Valley, swamp south of San Bernardino 305 Comment
  CLARK-A1528-5031  Spartina foliosa John C. Roos 1937-9-1 427 Orange Seal Beach Comment
  UCSB42171  Spergularia bocconi Roos, John 1966-3-13 Riverside On roadside, Winchester Comment
  CLARK-A1528-2478  Spergularia macrotheca John C. Roos 1937-3-27 643 Santa Barbara Gaviota Beach Comment
  CLARK-A1528-2479  Spergularia marina John C. Roos 1947-5-10 3623 San Bernardino Loma Linda Comment
  RSA0098490  Spergularia marina J. C. Roos 1947-3-15 3349 Riverside Mouth of Deep canyon. Santa Rosa Mtns. Comment
  RSA0098130  Spergularia rubra var. perennans J. C. Roos 1939-5-13 268 Napa Near Angwin. Comment
  CLARK-A1528-3246  Sphaeralcea ambigua subsp. monticola John C. Roos 1937-4-27 1657 San Bernardino Goffs Comment
  RSA40576  Sphaeromeria cana J. C. Roos 1947-7-13 2877 Inyo Summit of Telescope Peak 3363 Comment
  CLARK-A1528-1459  Sphenosciadium capitellatum John C. Roos 1937-7-22 1680 San Bernardino San Bernardino Mountains Comment
  UCR18923  Spiraea densiflora John C. Roos 1948-7-9 4002 Mono Sierra Nevada Mtns., Ellery Lake at Tioga Pass 2744 Comment
  CLARK-A1528-5037  Sporobolus airoides John C. Roos 1946-9-21 3077 San Bernardino San Bernardino Mountains 1081 Comment
  CAS-BOT-BC235448  Sporobolus cryptandrus J. C. Roos 1965-6-7 s.n. San Bernardino Victorville Comment
  CAS-BOT-BC235449  Sporobolus cryptandrus John C. Roos 1950-9-1 4948 San Bernardino Valley Wells Station, Mojave Desert 1127 Comment
  CLARK-A1528-5051  Sporobolus cryptandrus John C. Roos 1949-8-13 4619 San Bernardino New York Mountains 1828 Comment
  RSA155684  Sporobolus cryptandrus J. C. Roos 1955-6-20 6458 Inyo Last Chance Mountains 2 miles NE of Willow Spring. Comment
  RSA263053  Sporobolus cryptandrus A. R. Roos 1936-9-2 10380 San Bernardino Jct of Clark's Grade road and Santa Ana Canyon road, Seven Oaks Comment
  RSA450654  Sporobolus cryptandrus J. C. Roos 1965-8-15 s.n. Riverside Gilman Hot Springs, San Jacinto Valley. Comment
  RSA85277  Sporobolus cryptandrus J. C. Roos 1950-8-12 4932 San Bernardino Mill Creek near jct of Vivian Creek 1829 Comment
  UC1117447  Sporobolus cryptandrus J. C. and A. R. Roos 1955-8-26 6560 Inyo e. base Waucoba Mt. (Soldier Flat); Inyo Mts., , Soldier Flat 2164 Comment
  UCR24377  Sporobolus cryptandrus John C. Roos 1965-8-15 s.n. Riverside Gilman Hot Springs 610 Comment
  CLARK-A1528-5542  Sporobolus flexuosus John C. Roos 1946-9-14 3021 Riverside Asbestos Mountain 1066 Comment
  RSA52773  Sporobolus flexuosus J. C. Roos 1950-9-1 4949 San Bernardino Valley Wells, eastern Mojave Desert. 1128 Comment
  CAS-BOT-BC235463  Sporobolus indicus John Roos; Lucille Roos 1951-9-25 5277 Riverside Fairmont Park, Riverside 259 Comment
  CLARK-A1528-3132  Stachys albens John C. Roos 1937-7-10 1791 San Bernardino Reche Canyon Comment
  UC1010490  Stanleya pinnata John and Lucille Roos 1954-6-28 6177 Inyo s and e end Eureka Valley; south and east end Eureka Valley 914 Comment
  UC1080613  Stanleya pinnata John C. Roos 1955-5-13 6366 Inyo w side Eureka Valley at mouth Marble Canyon; w side Eureka Valley at mouth Marble Canyon 1036 Comment
  UC1236260  Stanleya pinnata John C. Roos 1955-5-13 6353 Inyo se end Eureka Valley; se end Eureka Valley 914 Comment
  RSA105014  Stanleya pinnata J. C. Roos 1955-5-16 6391 Inyo Waucoba road, 6 miles east of Big Pine, west side Inyo Mtns. 1494 Comment
  RSA155696  Stanleya pinnata J. C. Roos 1955-6-21 6466 Inyo Willow Creek, W side Last Chance Mtns 1585 Comment
  CLARK-A1528-2341  Stanleya pinnata subsp. inyoensis John C. Roos 1954-8-13 6209 Inyo Eureka Valley 914 Comment
  UCR23435  Stanleya pinnata var. inyoensis John C. Roos 1955-5-13 6353 Inyo Northern Mojave Desert, SE end of Eureka Valley 945 Comment
  CLARK-A1528-2482  Stellaria longipes John C. Roos 1937-7-21 379 San Bernardino San Bernardino Mountains Comment
  UCR27548  Stellaria longipes var. longipes John C. Roos 1960-7-4 s.n. Mono White Mtns, Crooked Creek 3293 Comment
  UCR25795  Stellaria nitens John C. Roos 1952-4-16 5549 Riverside Damp canyon off Reche Canyon. 518 Comment
  UCR25796  Stellaria nitens John C. Roos 1952-4-13 5531 Riverside N slope, on north side of Box Springs Mtns 396 Comment
  CLARK-A1528-95  Stenotaphrum secundatum John C. Roos, Lucille Roos 1951-9-22 5234 Riverside Riverside Comment
  RSA157865  Stenotus acaulis J. C. Roos 1955-6-19 6445 Inyo Summit ridge Last Chance Mtns., 2 miles W of Last Chance Spring. 2530 Comment
  CLARK-A1528-2104  Stephanomeria cichoriacea John C. Roos 1943-7-27 2689 San Bernardino San Bernardino Mountains Comment
  UCR24171  Stephanomeria exigua John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, east end of Bear Valley Comment
  UC1234813  Stephanomeria exigua subsp. coronaria J. C. Roos and E. C. Jaeger 1955-7-21 6477 Inyo 2 mi ne Willow Spring; Last Chance Mountains 2011 Comment
  UCR26163  Stephanomeria pauciflora John C. Roos 1947-4-18 3451 San Bernardino Central Mojave Desert, Cronese Dry Lake Comment
  SEINET880825  Stillingia spinulosa J. C. Roos 1965-1 s.n. Riverside Dillon Road in Desert Hot Springs. 305 Comment
  UCR18829  Stillingia spinulosa John C. Roos 1965-8-14 s.n. Riverside Sonoran (Colorado) Desert, Dillon Road in Desert Hot Springs. Comment
  UCR25114  Stipa X bloomeri John C. Roos, L. Roos 1951-7-28 5067 San Bernardino San Bernardino Mtns, Head of Rathbone Creek Comment
  UCR24293  Stipa cernua John C. Roos 1945-3-14 s.n. Los Angeles Los Angeles, Olympic Blvd., west of Fox Studios Comment
  CLARK-A1528-5273  Stipa comata John C. Roos, Lucille Roos 1951-8-8 5088 Inyo White Mountains 2590 Comment
  CLARK-A1528-5310  Stipa comata John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  SD53012  Stipa comata John C. Roos 1955-6-19 6453 Inyo Willow Spring, Last Chance Mountains 1829 Comment
  CLARK-A1528-5297  Stipa coronata John C. Roos 1940-8-17 1606 San Bernardino San Bernardino Mountains Comment
  UCR23301  Stipa lepida John C. Roos, L. Roos 1952-5-19 5691 Riverside North of Moreno 518 Comment
Read comments
May 20 2011
  UCR25375  Stipa lepida John C. Roos 1939-5-27 s.n. Riverside Reche Canyon Comment
  CLARK-A1528-5253  Stipa lettermanii John C. Roos 1946-8-25 2929 San Bernardino San Bernardino Mountains 2377 Comment
  CLARK-A1528-5264  Stipa lettermanii John C. Roos 1946-9-15 3030 San Bernardino San Bernardino Mountains 2316 Comment
  UCR20452  Stipa lettermanii John C. Roos, L. Roos 1950-6-24 4842 San Bernardino San Bernardino Mtns, Moonridge, Bear Valley 2226 Comment
  UCR30541  Stipa lettermanii John C. Roos 1950-7-29 4883 San Bernardino San Bernardino Mtns, Mill Creek at junction with Vivian Creek 1890 Comment
  CLARK-A1528-5263  Stipa occidentalis John C. Roos 1946-9-15 3032 San Bernardino San Bernardino Mountains 2956 Comment
  CLARK-A1528-5286  Stipa pinetorum John C. Roos, Alfred R. Roos 1954-6-12 6136 Inyo Panamint Range 243 Comment
  CLARK-A1528-5552  Stipa speciosa John C. Roos 1937-7-14 Riverside Reche Canyon Comment
  CLARK-A1528-5274  Stipa thurberiana John C. Roos, Lucille Roos 1951-8-8 5087 Inyo White Mountains 2590 Comment
  CLARK-A1528-4852  Streptanthella longirostris John C. Roos 1937-4-18 1372 Riverside Snow Creek Comment
  POM302500  Streptanthus bernardinus J. C. Roos 1943-7-31 2692 San Bernardino Kuffle Canyon, near Lake Arrowhead. San Bernardino Mountains. 1677 Comment
  SD53017  Streptanthus cordatus J. C. Roos 1955-6-17 6399 Inyo 2.0 miles northeast of Willow Spring, Last Chance Mountains. 2010 Comment
Read comments
Nov 4 2011
  RSA40552  Streptanthus cordatus J. C. Roos 1947-7-11 2841 Inyo Mahogany Flats, Panamint mtns. 2500 Comment
  CLARK-A1528-2112  Stylocline filaginea John C. Roos 1954-5-11 6118 Riverside Reche Canyon 609 Comment
  CLARK-A1528-4086  Styrax officinalis John C. Roos 1966-4-23 Riverside Santa Ana Mountains Comment
  CLARK-A1528-1010  Styrax officinalis subsp. fulvescens John C. Roos 1941-5-13 134 San Bernardino San Bernardino Mountains 761 Comment
  RSA444666  Styrax redivivus J. C. Roos 1966-4-23 s.n. Riverside S of Corona. Assoc. with Quercus dumosa and Rhamnus ilicifolia. Comment
  UCSB37352  Styrax redivivus Roos, John 1966-4-23 Riverside Santa Ana Mtns. S. of Corona Comment
  UC1043002  Suaeda calceoliformis John and Lucille Roos 1954-9-14 6236 Inyo 2.7 mi ne Death Valley Junction (along Ash Meadows road); Amargosa Desert 624 Comment
  UC1080631  Suaeda calceoliformis John and Lucille Roos 1954-9-14 6236 Inyo 2.7 mi ne Death Valley Junction (on Ash Meadows Road) 624 Comment
  CLARK-A1528-5423  Suaeda depressa var. erecta John C. Roos 1954-7-18 6193 Inyo Amargosa Desert 624 Comment
  CLARK-A1528-2602  Suaeda fruticosa Alfred R. Roos 1947-7-22 San Bernardino Loma Linda 304 Comment
  RSA509436  Suaeda moquinii A. R. Roos 1950-8-7 s.n. Inyo Tecopa Hot Springs, ca. 2 mi. N of Tecopa. 427 Comment
  UCR24214  Suaeda moquinii John C. Roos 1946-9-20 3056 San Bernardino Southern Mojave Desert, alkalai flat near Lucerne Valley Comment
  CLARK-A1528-1195  Suaeda torreyana John C. Roos 1940-8-22 245 San Bernardino Loma Linda Comment
  GH341022  Swallenia alexandrae J. C. Roos 1955-5-13 6365 Unknown west side Eureka Valley at mouth of Marble Canyon. 1036 Comment
  UCR24301  Swallenia alexandrae John C. Roos 1955-5-13 6365 Inyo Northern Mojave Desert, at the mouth of Marble Canyon, on the W side of Eureka Valley 1037 Comment
  CAS-BOT-BC269657  Symphoricarpos longiflorus John Roos; Lucille Roos 1947-7-12 2838 Inyo Wild Rose [Wildrose] Canyon on north side Baldy Peak, Panamint Mts. 2377 Comment
  CLARK-A1528-2414  Symphoricarpos longiflorus John C. Roos 1941-8-17 27 Inyo Panamint Mountains 3078 Comment
  CLARK-A1528-7871  Symphoricarpos parishii John C. Roos 1941-8-15 Inyo Panamint Range 2377 Comment
  UC1234731  Symphyotrichum frondosum J. C. and A. R. Roos 1955-8-28 6564 Inyo 3 mi n, w side of Owens Lake Olancha; Owens Lake 1082 Comment
  UCR25311  Symphyotrichum lanceolatum var. hesperium John C. Roos 1965-9-18 s.n. Inyo Owens Valley, west side of Owens Lake 1098 Comment
  CLARK-A1528-1458  Tauschia parishii John C. Roos 1947-6-27 3725 San Bernardino San Bernardino Mountains|South Fork 2194 Comment
  RSA44905  Tauschia parishii J. C. Roos 1947-6-27 3725 San Bernardino W ridge of South Fork of Santa Ana River. 2195 Comment
  RSA450470  Tetracoccus hallii J. C. Roos 1965-6-23 s.n. Riverside Lost Palms Canyon, Eagle Mountains, Colorado Desert. Comment
  RSA48173  Tetradymia argyraea J. C. Roos, Weatherby 1949-9-2 3573 San Bernardino Kingston Mountain; NE of Kingston Peak 2134 Comment
  RSA0001629  Tetradymia argyraea J. C. Roos, R. Weatherby 1949-9-2 3574 San Bernardino North side of Kingston Mts., eastern Mojave Desert. 1921 Comment
  UC1236263  Tetradymia axillaris var. axillaris John C. Roos 1955-5-16 6390 Inyo 7 mi e Big Pine (Waucoba road, w side Inyo Mts); Inyo Mts. 1615 Comment
  RSA79706  Tetradymia canescens J. C. Roos, A. R. Roos 1953-8-8 5940 Inyo Badger flat, Inyo Mountains 2652 Comment
  UCR19189  Tetradymia canescens John C. Roos 1965-8-9 s.n. Inyo Sierra Nevada Mountains, Independence Creek [near Onion Valley] 2683 Comment
  RSA659719  Tetradymia comosa J. C. Roos 1965-6-27 s.n. San Bernardino Loma Linda Hills. 305 Comment
  RSA155693  Tetradymia glabrata J. C. Roos 1955-6-21 6469 Inyo Inyo Mountains. Narrow canyon along Loretto Rd. 1.5 mi SW of Loretto Mine, E slope of mtns 1677 Comment
  RSA45514  Teucrium cubense subsp. depressum J. C. Roos 1949-4-8 4201 Imperial Edge of irrigated field, Palo Verde. Comment
  CLARK-A1528-2347  Thelypodium integrifolium John C. Roos 1946-9-21 3046 San Bernardino San Bernardino Mountains 1081 Comment
  SEINET814546 Image available Thymophylla pentachaeta J. C. Roos 1948-1 4032 San Bernardino North slope of Clark Mountain, along powerline. Comment
  UCSB42155  Thymophylla pentachaeta Roos, John 1950-8-4 San Bernardino N. side of Clark Mtn., E. Mojave Desert Comment
  UCR25946  Thysanocarpus curvipes John C. Roos, L. Roos 1952-5-17 5681 Los Angeles Western Mojave Desert, 16 miles west of Adelanto 915 Comment
  RSA0039176  Thysanocarpus desertorum J. C. Roos, L. Roos 1952-5-17 5681 Los Angeles 16 miles west of Adelanto, Mohave desert. 915 Comment
  UCR18803  Thysanocarpus laciniatus John C. Roos 1948-5-8 3818 Riverside San Bernardino Mtns, Whitewater 579 Comment
  CLARK-A1528-5490  Tidestromia oblongifolia John C. Roos 1965-7-11 Inyo Stovepipe Wells Comment
  UCR23546  Tiquilia canescens John C. Roos 1958-2-22 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Bench, SW end of Chuckwalla Mtns. Comment
  RSA0103518  Tiquilia canescens var. canescens J. C. Roos 1949-5-29 3534 San Bernardino North foot of Clark Mts., eastern Mojave Desert. 1220 Comment
  RSA92739  Tiquilia nuttallii J. C. Roos 1952-5-17 5679 Los Angeles 16 miles W of Adelanto, Mojave Desert. 915 Comment
  UCR18799  Tiquilia palmeri John C. Roos 1965-10-17 s.n. Riverside Sonoran (Colorado) Desert, 10 mi. west of Blythe Comment
  CLARK-A1528-2717  Tragia ramosa John C. Roos 1950-9-3 4978 San Bernardino Clark Mountain Range 1859 Comment
  CLARK-A1528-1385  Trianthema portulacastrum John C. Roos 1954-11-21 6256 San Bernardino Loma Linda 335 Comment
  UCR19709  Trianthema portulacastrum John C. Roos 1954-11-21 6256 San Bernardino San Bernardino Valley, Loma Linda 336 Comment
  UC1236221  Tricardia watsonii John C. Roos 1955-5-16 6388 Inyo Along Loretto Road 3 miles southwest of Loretto Mine, Inyo Mts. 1859 Comment
  CLARK-A1528-2128  Trichocoronis wrightii John C. Roos 1937-6-7 2505 Riverside San Jacinto Valley Comment
  CLARK-A1528-2129  Trichoptilium incisum John C. Roos 1949-3-5 4089 Riverside Orocopia Mountains Comment
  CLARK-A1528-5695  Trichostema parishii John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  UCR24374  Tridens muticus John C. Roos 1949-5-28 3536 San Bernardino Eastern Mojave Desert, near Coloseum Mine, on the N slopes of Clark Mountain 1829 Comment
  UCSB51396  Tridens muticus Roos, John 1966-11-12 Riverside Spring Tank, Chuckwalla Mtns. Comment
  UCR25326  Trientalis latifolia John C. Roos 1939-4-29 290 Napa North Coast Range, Pacific Union College, Angwin 549 Comment
  CLARK-A1528-2877  Trifolium albopurpureum John C. Roos 1937-5-26 1697 Santa Barbara Cuyama Valley Comment
  CLARK-A1528-5098  Trifolium fimbriatum John C. Roos 1965-9-18 Inyo Owens Lake Comment
  CLARK-A1528-2880  Trifolium gracilentum John C. Roos 1950-4-1 4720 Los Angeles Comment
  UCR30851  Trifolium kingii subsp. productum John C. Roos 1948-8-31 3926 Shasta Castle Crags 1494 Comment
  UCR23915  Trifolium monanthum var. grantianum John C. Roos 1947-6-27 3712 San Bernardino San Bernardino Mtns, South Fork of Santa Ana River 2165 Comment
  UCR23856  Trifolium monoense John C. Roos 1962-8-25 s.n. Inyo Northern Mojave Desert, SW shoulder of Waucoba Mtn, Inyo Mtns Comment
  UCR18630  Trifolium truncatum John C. Roos 1952-4-2 5458 Riverside Edgemont 488 Comment
  RSA659788  Trifolium variegatum J. C. Roos 1952-5-26 5714 Riverside Hass' Ranch. Reche Canyon. 457 Comment
  UCR25547  Trifolium willdenovii John C. Roos 1941-4-25 159 Riverside Plateau in Reche Canyon Comment
  RSA450121  Trifolium wormskioldii J. C. Roos 1965-6-26 s.n. San Bernardino Santa Ana River Canyon, Heart Bar area, San Bernardino Mtns. Comment
  RSA662067  Trifolium wormskioldii J. C. Roos 1965-6-26 s.n. San Bernardino Upper Santa Anita Canyon, Heart Bar area. San Bernardino Mtns. Comment
  CAS-BOT-BC451812  Triglochin maritima John Roos; Lucille Roos 1954-5-7 6078 Inyo Amargosa Desert 3 miles NE of Death Valley Junction along Ash Meadows road. 624 Comment
  CLARK-A1528-5576  Trisetum canescens John C. Roos 1941-8-2 86 Riverside San Jacinto Mountains 2133 Comment
  UCR19362  Trisetum canescens John C. Roos 1947-6-27 3715 San Bernardino San Bernardino Mountains, Stetson Creek drainage, Barton Flats 1890 Comment
  CAS-BOT-BC200174  Trisetum spicatum John Roos; Lucille Roos 1951-8-10 5145 Mono East face White Mtn. Peak, White Mts. 4175 Comment
  NY1144044  Trisetum spicatum J. C. Roos 1951-8-10 5145 Mono White Mountains, east face White Mountain Peak. 4176 Comment
  POM263111  Trisetum spicatum J. C. Roos 1937-8-8 423 Inyo Lone Pine Canyon. 3049 Comment
  RSA78389  Triteleia ixioides subsp. scabra J. C. Roos 1951-5-27 5049 Mariposa 8 miles E of Mariposa. 1006 Comment
  UCSB45530  Triteleia laxa Roos, John; Roos, Lucille 1952-4-13 San Bernardino Hills south of Loma Linda, San Bernardino Valley 381 Comment
  CLARK-A1528-3021  Turricula parryi John C. Roos 1946-8-27 2942 Riverside Santa Rosa Mountains 2194 Comment
  UCR23548  Vaccinium cespitosum John C. Roos 1965-8-8 s.n. Fresno Sierra Nevada Mtns., Kearsarge Lake. Middle Section of Kings Canyon National Park 3354 Comment
  CLARK-A1528-4323  Verbascum thapsus John C. Roos 1937-7-25 2359 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4324  Verbascum thapsus John C. Roos 1968-9-28 San Bernardino San Bernardino Mountains 1981 Comment
  UCR19527  Verbascum thapsus John C. Roos 1965-7-24 s.n. San Bernardino San Bernardino Mtns, Mountain Home Canyon Comment
  CLARK-A1528-7880  Verbena lasiostachys John C. Roos 1965-9-11 San Bernardino San Bernardino Mountains Comment
  UCR25145  Verbena lasiostachys John C. Roos 1965-9-11 s.n. San Bernardino San Bernardino Mtns, Mill Creek Comment
  RSA0021079  Verbena lasiostachys var. lasiostachys J. C. Roos, L. Roos 1952-6-21 5781 Riverside Pass between Reche Canyon and Moreno Valley, 4 mi. NW of Moreno. 686 Comment
  UCR25396  Verbena scabra John C. Roos 1937-7-31 964 San Bernardino San Bernardino Valley, San Bernardino 305 Comment
  CLARK-A1528-2136  Verbesina encelioides subsp. exauriculata John C. Roos 1937-6-29 2485 Los Angeles Oxnard Comment
Read comments
Dec 5 2014
  CLARK-A1528-4332  Veronica peregrina subsp. xalapensis John C. Roos 1937-5-10 2073 Riverside Elsinore Comment
  RSA450073  Veronica peregrina var. xalapensis J. C. Roos 1966-3-24 s.n. Riverside Near Edgemont. On the muddy edge of a vernal pool, assoc. with Callitriche. Comment
  CLARK-A1528-5153  Veronica persica John C. Roos 1947-3-21 3376 San Bernardino Loma Linda Comment
  UCR25219  Veronica persica John C. Roos 1965-6-21 s.n. Riverside Hemet Comment
  CLARK-A1528-2898  Vicia exigua John C. Roos 1937-6-11 1444 San Diego Campo Comment
  CLARK-A1528-2899  Vicia villosa John C. Roos 1937-6-11 1436 San Diego Potrero Comment
  CLARK-A1528-2142  Viguiera multiflora John C. Roos 1965-7-11 Inyo Panamint Mountains Comment
  UCR27517  Viola adunca John C. Roos 1937-6-5 931 San Bernardino San Bernardino Mtns., Crestline Comment
  UCR26257  Viola lobata John C. Roos 1937-6-15 524 San Diego Peninsular Range, Julian Comment
  CLARK-A1528-4410  Viola macloskeyi John C. Roos 1937-7-22 2369 San Bernardino San Bernardino Mountains Comment
  UCR23755  Vitis girdiana John C. Roos 1965-10-7 s.n. Riverside Fairmont Park in Riverside 244 Comment
  UCR23758  Vitis girdiana John C. Roos 1947-6-21 3700 San Bernardino San Bernardino Mtns, Cushenbury Canyon, alkaline springs [probably Whiskey Springs] on north side of the mountains 1677 Comment
  POM263251  Vulpia microstachys var. confusa J. C. Roos 1939-4-18 251 Napa 3.5 miles north of Pacific Union College, Angwin. Comment
  POM266331  Vulpia microstachys var. pauciflora J. C. Roos 1937-5-2 1282 Riverside La Sierra, western Riverside. [Collection is Jack Frost Lake. aka Frost Reservoir, apparently a part of La Sierra [Loma Linda University Campus] ca. 1937 south of Indiana Avenue and west of Sayward Circle, near Pierce;, Owned by city of Riverside ca. 2000 Comment
  RSA85582  Vulpia microstachys var. pauciflora J. C. Roos 1952-4-2 5464 Riverside Box Springs grade east of Riverside. 427 Comment
  UCR24387  Whipplea modesta John C. Roos 1939-5-6 295 Napa North Coast Range, Pacific Union College, Angwin 549 Comment
  UCR19498  Xanthium spinosum John C. Roos 1965-7-21 s.n. San Bernardino San Bernardino Valley, Loma Linda 396 Comment
  CLARK-A1528-3055  Xylococcus bicolor John C. Roos, Lucille Roos 1954-2-13 6044 San Diego Merriam Mountains Comment
  UCSB45518  Zeltnera muehlenbergii Roos, John 1957-7-3 Sonoma Healdsberg Comment
  UCR18905  Ziziphus obtusifolia John C. Roos 1965-6-23 s.n. Riverside Sonoran (Colorado) Desert, Eagle Mtns, Lost Palms Wash Comment



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