Search Results — 2000 specimen records retrieved (1746 records with coordinates)
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Results for search: Collector=Roos;   

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(For large data reqests, please contact Jason Alexander, jason_alexander@berkeley.edu.)

 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/cch_archive/).
 Records are made available under the CCH Data Use Terms.

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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  CLARK-A1528-2720  Acacia greggii John C. Roos 1950-8-4 San Bernardino Clark Mountain Range Comment
  CLARK-A1528-2722  Acacia melanoxylon John C. Roos 1943-8-5 Los Angeles Pomona Comment
  CLARK-A1528-2686  Acalypha californica John C. Roos 1937-8-30 2565 San Diego Jamul Comment
  GH386624  Acamptopappus shockleyi J. C. Roos 1955-5-13 6345 Unknown west base Last Chance Mts. east of Eureka Valley sand dunes 1280 Comment
  RSA40571  Acamptopappus shockleyi J. C. Roos 1947-4-20 3519 Inyo Panamint Mountains, Emigrant Pass. 1280 Comment
  LA102160  Acer glabrum var. diffusum 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-A1528-1370  Acer macrophyllum John C. Roos 1946-8-31 2936 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1371  Acer macrophyllum John C. Roos 1937-5-9 2088 San Bernardino Oak Glen Comment
  RSA658865  Acer negundo J. C. Roos 1946-8-31 2935 San Bernardino Oak Glen School, San Bernardino Mtns. Comment
  UCR25767  Acer negundo John C. Roos 1949-4-2 4134 Riverside upper San Timoteo Canyon Comment
  CLARK-A1528-5495  Achillea millefolium John C. Roos 1965-6-12 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2275  Achlys triphylla John C. Roos 1957-7-2 6646 Sonoma Millers Ridge Comment
  RSA104834  Achnatherum aridum J. C. Roos 1955-5-13 6346 Inyo West base Last Chance Mountains, east of Eureka Valley sand dunes 1220 Comment
  SEINET4692067 Image available Achnatherum coronatum J. C. Roos 1950-1 4817 Riverside Hills NE of summit of Reche Canyon 762 Comment
  CAS-BOT-BC216429  Achnatherum lettermanii J. C. Roos 1965-7-17 s.n. San Bernardino Stetson Creek, Barton Flats, San Bernardino Mountains Comment
  RSA40596  Achnatherum nevadense J. C. Roos 1947-7-14 2857 Inyo N slope Bady Peak, Panamint Mts 2591 Comment
  UCSB37783  Achnatherum occidentale subsp. californicum Roos, John 1981-09 San Bernardino Barton Flats, San Bernardino Mtns. Comment
  UCSB45574  Achnatherum occidentale subsp. californicum Roos, John 1967-10-7 Inyo Big Pine Creek below Palisade Glacier. 2895 Comment
  CAS-BOT-BC210896  Achnatherum parishii subsp. depauperatum John Roos; Lucille Roos 1947-7-13 2888 Inyo East slope Baldy Pk., Panamint Mts. 2529 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-BC218078  Achnatherum pinetorum J. C. Roos; A. R. Roos 1954-6-12 6136 Inyo N face Wild Rose Peak, Panamint Mountains 2682 Comment
  RSA71679  Achnatherum pinetorum J. C. Roos 1951-8-10 5130 Mono 1.5 miles N of Piute Mts, White Mts. 3567 Comment
  RSA79707  Achnatherum pinetorum J. C. Roos 1953-8-8 5939 Inyo Badger flat, Inyo Mountains 2652 Comment
  UC1023382  Achnatherum pinetorum John and Lucille Roos 1951-8-10 5130 Mono 1 1/2 mi n Piute Mtn.; White Mts. 3566 Comment
  UC1023407  Achnatherum pinetorum J. C. and A. R. Roos 1953-8-8 5939 Inyo Badger Flat Inyo Mts., Badger Flat 2651 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
  CLARK-A1528-3973  Adenostoma sparsifolium John C. Roos 1946-8-27 2787 Riverside Santa Rosa Mountains 1920 Comment
  CLARK-A1528-4007  Adenostoma sparsifolium John C. Roos 1937-8-17 2405 Riverside San Jacinto Mountains 1066 Comment
  UCR23515  Adenostoma sparsifolium John C. Roos 1936-9-15 2514 Riverside San Jacinto Mtns., Near the summit of the Pines to Palms Hwy 1494 Comment
  UCR18785  Adiantum capillus-veneris John C. Roos 1948-5-15 3850 Riverside Sonoran (Colorado) Desert, Eagle Mountains, upper Lost Palms Canyon 1037 Comment
  RSA92775  Adiantum capillus-veneris J. C. Roos, Lucille Roos 1954-11-25 6263 Inyo mouth of Beveridge Canyon at est base of Inyo Mountains, Saline Valley 609 Comment
  CLARK-A1528-3539  Adiantum jordanii John C. Roos 1952-2-29 5363 Riverside Reche Canyon 457 Comment
  CLARK-A1528-3135  Agastache urticifolia John C. Roos 1946-8-31 2990 San Bernardino Oak Glen Comment
  RSA79491  Agoseris parviflora J. C. Roos 1953-8-11 6003 Inyo In pass 3 miles east of Blue Bell Mine on trail to Side Hill Spring. 3108 Comment
  CLARK-A1528-5213  Agropyron elongatum John C. Roos 1967-11-25 San Bernardino San Bernardino Mountains 426 Comment
  UCR25465  Agrostis capillaris John C. Roos 1950-7-20 4865 San Francisco San Francisco Bay Region, San Francisco City College 91 Comment
  RSA78217  Agrostis exarata J. C. Roos 1951-7-30 5076 Los Angeles North slope Mt. Baden Powell, San Gabriel Mountains. 2043 Comment
  CLARK-A1528-4446  Agrostis idahoensis John C. Roos 1946-9-4 2943 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-7824  Agrostis scabra John C. Roos 1937-8-18 494 Riverside San Jacinto Mountains Comment
  RSA664943  Agrostis scabra J. C. Roos 1937-7-25 410 San Bernardino Clarks Grade. (S. of Big Bear Lake) San Bernardino Mountains. Comment
  UCR23918  Agrostis scabra John C. Roos 1940-8-3 1555 San Bernardino San Bernardino Mtns., Bluff Lake 2317 Comment
  UCR25466  Agrostis stolonifera John C. Roos 1950-9-16 4988 Los Angeles Los Angeles, Santa Monica Blvd. at Midvale Ave. 61 Comment
  RSA457393  Agrostis stolonifera A. R. Roos 1937-8-19 10693 Riverside Idyllwild, San Jacinto Mountains. 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
  UCR26197  Ailanthus altissima John C. Roos 1937-6-8 937 San Diego Peninsular Range, Warner Hot Springs Comment
  UCR25304  Aira praecox John C. Roos 1957-7-2 6637 Mendocino Point Arena Lighthouse, on the coast 15 Comment
  RSA450097  Alchemilla occidentalis J. C. Roos 1950-4-22 4751 Riverside On the hills N.E. of the summit of Reche Canyon. 823 Comment
  UCR25758  Allionia incarnata John C. Roos 1937-4-25 798 San Bernardino Southeastern Mojave Desert, west of Essex Comment
  UC1234857  Allium atrorubens var. cristatum J. C. Roos 1955-6-19 6439 Inyo 3 mi s Willow Spring; Last Chance Mountains 2286 Comment
  POM263555  Allium fimbriatum var. fimbriatum J. C. Roos 1941-5-10 129 Riverside Pinyon Flats Camp, Santa Rosa Mountains. 1220 Comment
  POM264307  Allium haematochiton J. C. Roos 1937-3-10 634 Riverside Norco hills. Comment
  CLARK-A1528-7758  Allium monticola John C. Roos 1937-7-16 636 Los Angeles San Gabriel Mountains Comment
  CLARK-A1528-7759  Allium monticola John C. Roos 1937-7-16 636 Los Angeles San Gabriel Mountains 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
  CLARK-A1528-1514  Allium praecox John C. Roos 1950-3-27 4718 San Bernardino Slover Mountain 350 Comment
  CLARK-A1528-1515  Allium validum John C. Roos 1965-8-9 Inyo Independence Creek Comment
  CLARK-A1528-5243  Alnus rhombifolia var. bernardina John C. Roos 1936-8-15 570 San Bernardino San Bernardino Mountains 1981 Comment
  CLARK-A1528-7784  Amaranthus albus John C. Roos 1965-7-27 Riverside Hemet Comment
  POM262995  Amaranthus blitoides J. C. Roos 1940-9-14 232 San Bernardino Orchard south of Bryn Mawr. Comment
  UCR23428  Amaranthus blitoides John C. Roos 1946-9-21 3073 San Bernardino Mojave Desert, Rabbit Springs, Lucerne Valley 887 Comment
  POM265637  Amaranthus californicus J. C. Roos 1937-8-19 2020 Riverside Hemet Valley, just above Hemet Lake, San Jacinto Mountains. Comment
  CLARK-A1528-1394  Amaranthus deflexus John C. Roos 1954-10-19 6255 San Diego Escondido 198 Comment
  CLARK-A1528-1395  Amaranthus fimbriatus John C. Roos 1963-10-23 Riverside Chuckwalla Mountains Comment
  RSA69868  Amaranthus fimbriatus J. C. Roos 1951-9-19 5222 San Bernardino In irrigated orhard with Amaranthus Palmeri, Tribulus terrestris, Loma Linda Comment
  RSA0036246  Amaranthus hybridus A. R. Roos 1937-12-2 s.n. Orange Santa Ana. Comment
  CLARK-A1528-112  Amaranthus palmeri John C. Roos 1951-9-19 5223 San Bernardino Loma Linda Comment
  UCR23419  Amaranthus palmeri John C. Roos 1940-6-24 1895 San Bernardino San Bernardino Valley, Loma Linda 305 Comment
  UCR25292  Amaranthus palmeri Alfred R. Roos 1937-12-9 s.n. Orange West 17th St. in Santa Ana Comment
  CLARK-A1528-1403  Amaranthus palmeri Alfred R. Roos 1936-9-25 San Bernardino Comment
  CLARK-A1528-5482  Amaranthus retroflexus Alfred R. Roos 1937-11-24 San Bernardino Bryn Mawr Comment
  RSA662074  Amaranthus retroflexus A. R. Roos 1937-11-24 s.n. San Bernardino Bryn Mawr. Comment
  GH404015  Amaranthus torreyi J. C. Roos & A. R. Roos 1950-8-5 4905 Unknown Coliseum Mine, Clark Mts., eastern Mohave Desert 1706 Comment
  UC1010300  Amaranthus torreyi John C. Roos 1950-9-1 4958 San Bernardino vicinity Coliseum Mine (e Mohave Desert); Mohave Desert, Clark Mts. 1615 Comment
  UCD128668  Amauriopsis dissecta J. C. Roos 1946-8-24 2923 Riverside Santa Rosa Mountains. 2286 Comment
  POM262996  Ambrosia acanthicarpa J. C. Roos 1940-9-28 233 San Bernardino Loma Linda. Comment
  CLARK-A1528-1534  Ambrosia chenopodiifolia John C. Roos 1937-6-13 1441 San Diego San Ysidro Comment
  CLARK-A1528-1103  Ambrosia confertiflora John C. Roos 1943-4-10 2613 San Bernardino Loma Linda 365 Comment
  CLARK-A1528-5358  Ambrosia confertiflora John C. Roos 1949-10-12 4691 San Bernardino Loma Linda Comment
  RSA648062  Ambrosia confertiflora J. C. Roos 1943-4-10 2613 San Bernardino Loma Linda. Comment
  UCR24357  Ambrosia confertiflora John C. Roos 1942-10-10 1722 Los Angeles Westwood Village, Malcolm Ave. and Santa Monica Blvd. 98 Comment
  CLARK-A1528-1535  Ambrosia dumosa John C. Roos 1937-4-18 1349 Riverside Snow Creek Comment
  UCR18583  Ambrosia ilicifolia John C. Roos, Lucille Roos 1949-4-10 4230 Riverside Sonoran (Colorado) Desert, Chuckwalla Mts, canyon 3.5 mi. SE of Desert Center 612 Comment
  UCSB45945  Ambrosia psilostachya Roos, Alfred 1937-11-15 San Bernardino Loma Linda Comment
  CLARK-A1528-1544  Ambrosia trifida John C. Roos 1937-9-7 Los Angeles North Hollywood Comment
  UCR27935  Amelanchier covillei John C. Roos 1948-7-4 3914 Inyo Panamint Mtns., Thorndike's Spring 2165 Comment
  RSA47540  Amelanchier utahensis subsp. covillei J. C. Roos 1949-5-28 4349 San Bernardino North slope of Clark Mountains 1890 Comment
  UCSB42198  Amorpha fruticosa var. occidentalis John C. Roos 1966-5-5 Riverside collected in Gilman Hot Springs of the San Jacinto Valley Gilman Hot Springs Comment
  UCR24368  Amphipappus fremontii John C. Roos 1955-5-13 6336 Inyo Northern Mojave Desert, west base of Last Chance Mountains, east of Eureka Valley sand dunes 1280 Comment
  CLARK-A1528-1545  Amphipappus fremontii John C. Roos 1955-4-6 6291 Inyo Inyo Mountains 518 Comment
  CLARK-A1528-4456  Andropogon glomeratus John C. Roos 1938-12-29 322 Riverside Palm Canyon Comment
  POM263194  Andropogon glomeratus J. C. Roos 1938-12-29 322 Riverside Palm Canyon. Comment
Read comments
Apr 3 2011
  UCR30562  Anisocoma acaulis John C. Roos 1949-5-28 4339 San Bernardino Eastern Mojave Desert, wash near Green's Mine, north side Clark Mountain 1646 Comment
  CLARK-A1528-5127  Antennaria rosea John C. Roos 1939-6-3 6/ 3 /39 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1554  Anthemis cotula John C. Roos 1965-6-29 San Bernardino Bryn Mawr 304 Comment
  CLARK-A1528-1555  Anthemis cotula John C. Roos 1941-6-14 San Diego Lemon Grove Comment
  POM266318  Anthemis cotula J. C. Roos 1937-5-23 23434 Riverside La Sierra. Comment
  RSA301700  Anthoxanthum odoratum A. R. Roos 1938-6-20 1524 Sonoma field between Santa Rosa and Sonoma Comment
  RSA0034830  Antirrhinum coulterianum J. C. Roos 1941-5-17 138 Riverside About 4 miles S.W. of March Field. Comment
  CLARK-A1528-4163  Antirrhinum kelloggii John C. Roos 1956-4-8 6574 Ventura Potrero Valley Comment
  UCR24488  Antirrhinum nuttallianum subsp. subsessile John C. Roos 1956-4-8 6575 Ventura Potrero Valley. N slope of 'Bony Mtn.' 840 Comment
  CLARK-A1528-1419  Apiastrum angustifolium John C. Roos 1969-5-17 San Bernardino Loma Linda Hills brushy north slope; in semi-shade, ; ; San Bernardino South. 7.5'Q 365 Comment
Read comments
Oct 26 2015
  UCR23397  Apiastrum angustifolium John C. Roos 1943-4-28 2629 Riverside hills SE of Riverside Comment
  UCSB49864  Apiastrum angustifolium Roos, John 1969-5-17 San Bernardino Loma Linda Hills 365 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
  CLARK-A1528-1475  Apocynum cannabinum John C. Roos 1958-6-20 Mariposa Yosemite National Park Comment
  UCR26266  Apocynum cannabinum John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Emigrant Spring, Death Valley 1250 Comment
  RSA47337  Aquilegia shockleyi J. C. Roos, L. Roos 1949-6-24 4488 San Bernardino north side of Clark Mts. 2287 Comment
  UCR23248  Arabis glaucovalvula John C. Roos 1947-4-20 3515 Inyo Northern Mojave Desert, Panamint Mtns: Emigrant Pass 1555 Comment
  CLARK-A1528-2284  Arabis inyoensis John C. Roos 1937-8-8 2191 Inyo Lone Pine Canyon 2743 Comment
  CLARK-A1528-2285  Arabis lemmonii John C. Roos 1951-8-10 5144 Mono White Mountains 4145 Comment
  RSA0129930  Arabis lemmonii J. C. Roos 1937-8-8 2191 Inyo Lone Pine Canyon. 2744 Comment
  UCR18766  Arabis perennans John C. Roos 1948-7-2 3907 Inyo Northern Mojave Desert, Panamint Mouontains, Mahogany Flats 2409 Comment
  CLARK-A1528-2423  Arabis platysperma John C. Roos 1936-7-30 948 San Bernardino San Bernardino Mountains 3291 Comment
  CLARK-A1528-2290  Arabis pulchra John C. Roos 1947-6-27 3717 San Bernardino San Bernardino Mountains 2133 Comment
Read comments
Oct 22 2014
  CLARK-A1528-2291  Arabis pulchra John C. Roos 1962-3-24 Riverside Whitewater Comment
  CLARK-A1528-2292  Arabis pulchra John C. Roos 1952-7-27 5830 Inyo White Mountains 3169 Comment
  UCR25680  Arabis sparsiflora John C. Roos, A. R. Roos 1953-8-9 5962 Inyo Northern Mojave Desert Region, Inyo Mountains, near head of Tamarack Canyon 3049 Comment
  UCR30570  Arabis sparsiflora var. arcuata John C. Roos 1937-6-5 2210 San Bernardino San Bernardino Mtns., Crestline Comment
  CLARK-A1528-1484  Aralia californica John C. Roos 1937-7-15 383 San Bernardino San Gabriel Mountains Comment
  POM301544  Arbutus menziesii J. C. Roos 1942-3-21 1095 Los Angeles Chantry Flats, Santa Anita Canyon Comment
  CLARK-A1528-4416  Arceuthobium abietinum John C. Roos 1965-8-21 Tulare Sequoia Comment
  CLARK-A1528-3401  Arctomecon merriamii John C. Roos, Lucille Roos 1954-3-27 6053 Inyo Grapevine Mountains Comment
  UCR23643  Arctostaphylos andersonii John C. Roos 1940-6-13 1546 Monterey 3 or 4 mi east of Castroville. Comment
  POM263487  Arctostaphylos stanfordiana subsp. stanfordiana J. C. Roos 1939-1-21 300 Napa Angwin. 366 Comment
  CLARK-A1528-2438  Arenaria aculeata John C. Roos 1937-8-5 642 Inyo White Mountains 2743 Comment
Read comments
Jun 4 2015
  POM274234  Arenaria congesta var. subcongesta J. C. Roos 1947-7-11 2844 Inyo Mahogany Flats, Panamint mtns. 2500 Comment
  RSA0124238  Arenaria kingii subsp. compacta J. C. Roos 1951-8-10 5161 Mono 1 mile N of Sheep Mtn, White Mts. 3598 Comment
  UCR18964  Arenaria macradenia var. macradenia John C. Roos 1965-7-22 s.n. Riverside San Jacinto Mtns, Thomas Valley Comment
  CLARK-A1528-2448  Arenaria macradenia var. parishiorum John C. Roos 1937-4-25 2104 San Bernardino Providence Mountains Comment
  CLARK-A1528-4859  Arenaria macradenia var. parishiorum John C. Roos 1949-5-28 4336 San Bernardino Clark Mountain 1615 Comment
  CLARK-A1528-2632  Arenaria nuttallii subsp. gracilis John C. Roos 1946-9-4 2969 San Bernardino San Bernardino Mountains 3201-3292 Comment
  UCR25928  Arenaria nuttallii subsp. gracilis John C. Roos 1949-7-4 25928 San Bernardino San Bernardino Mtns., S side of San Gorgonio Peak 3171 Comment
  UCR19211  Argemone munita John C. Roos 1949-4-7 4162 Imperial Sonoran (Colorado) Desert, 3 mi. north of Niland Comment
  RSA92431  Argyrochosma jonesii J. C. Roos, Lucille Roos 1954-5-8 6103 Inyo Titus Canyon, Grapevine Mountains 1280 Comment
  LA102277  Arida carnosa John C. Roos; 1956-8-2 6591 San Bernardino N side of Highway 99, 0.2 mi. W of Waterman Ave Comment
  CLARK-A1528-4463  Aristida adscensionis John C. Roos 1952-4-9 5508 Riverside Mount Rubidoux 365 Comment
  RSA457402  Aristida adscensionis J. C. Roos 1937-6-26 s.n. San Bernardino Redlands. Comment
  UCR19683  Aristida californica John C. Roos 1946-9-14 3007 Riverside Santa Rosa Mtns, Dos Palmas Spring, east of Asbestos Mountain 1070 Comment
  POM266630  Aristida oligantha J. C. Roos 1939-7-3 1517 Yuba plains near Marysville Comment
  CLARK-A1528-4482  Aristida purpurea John C. Roos 1965-8-15 Riverside San Jacinto Valley Comment
  RSA659618  Aristida purpurea J. C. Roos 1965-8-15 s.n. Riverside Gilman Hot Springs, San Jacinto Valley. Comment
  SEINET244838 Image available Aristida purpurea J. C. Roos 1949-4-8 4198 Riverside Imperial Co., Calif. Comment
  UCSB51394  Aristida purpurea Roos, John 1965-6-23 Riverside Lost Palms Canyon, Eagle Mtns Comment
  SEINET14198778  Aristida purpurea J. Roos, L. Roos 1954-5-8 6106 Inyo Titus Canyon below Dlare Spring, Grapevine Mtns. Comment
  UCR23878  Aristida purpurea var. fendleriana John C. Roos 1949-6-22 4443 San Bernardino Eastern Mojave Desert, New York Mtns, Barnwell 1494 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
  UCR19678  Aristida purpurea var. nealleyi John C. Roos, Lucille Roos 1949-4-11 4242 Riverside Sonoran (Colorado) Desert, Hayfield Dry Lake Comment
  RSA85678  Aristida purpurea var. purpurea J. C. Roos 1950-8-5 4906 San Bernardino North slopes Clark Mountains along power line road, eastern Mojave Desert. 1280 Comment
  RSA0034601  Aristida purpurea var. purpurea J. C. Roos 1965-8-15 s.n. Riverside Gilman Hot Springs, San Jacinto Valley. Comment
  CAS-BOT-BC89986  Arnica mollis John Roos; Lucille Roos 1951-8-11 5171 Mono Campito Meadow, White Mts. 3322 Comment
  RSA71399  Arnica parryi subsp. sonnei J. C. Roos, L. Roos 1951-8-11 5171 Mono Campito Meadow, White Mts. 3323 Comment
  CLARK-A1528-1059  Artemisia ludoviciana John C. Roos 1937-7-27 1970 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1579  Artemisia ludoviciana John C. Roos 1937-3-1 2480 San Bernardino Victorville Comment
  CAS-BOT-BC93726  Artemisia ludoviciana subsp. albula John Roos; Lucille Roos 1947-9-20 2814 Inyo Emigrant Wash near Emigrant Spring, Panamint Mts. 1249 Comment
  UC1506369  Artemisia ludoviciana subsp. incompta J. C. Roos 1948-9-7 4000 Mono Tioga Pass 2682 Comment
Read comments
Sep 29 2010
  POM266369  Artemisia ludoviciana subsp. ludoviciana J. C. Roos 1937-8-4 2444 Inyo along a stream-bed, Independence Comment
  RSA450740  Artemisia ludoviciana subsp. ludoviciana J. C. Roos 1961-9-2 1981 Inyo Canyon below Side Hill Spring, Inyo Mountains 2805 Comment
  CAS-BOT-BC90798  Artemisia michauxiana J. C. Roos; A. R. Roos 1955-8-26 6555 Inyo Summit Waucoba Mt., Inyo Mts. 3383 Comment
  CAS-BOT-BC90805  Artemisia michauxiana John Roos; Lucille Roos 1951-8-10 5143 Mono east slope White Mtn. Peak, White Mts. 4145 Comment
  RSA71689  Artemisia michauxiana J. C. Roos, L. Roos 1951-8-10 5143 Mono East slope White Mtn. Peak, White Mts. 4146 Comment
  CAS-BOT-BC90844  Artemisia nova John C. Roos 1946-8-29 2768 San Bernardino Eagle Point, Bear Valley, San Bernardino Mts. 2042 Comment
  CLARK-A1528-7841  Artemisia nova John C. Roos 1948-9-18 4069 San Bernardino Mojave Desert 1584 Comment
  RSA45486  Artemisia nova J. C. Roos, Lucille Roos 1948-9-18 4030 San Bernardino North side of Clark Mountains, dry wash below Colisseum Mine 1524 Comment
  CLARK-A1528-1587  Artemisia nova John C. Roos 1947-9-19 2796 Inyo Panamint Mountains 3352 Comment
  POM274192  Artemisia rothrockii J. C. Roos 1946-8-29 2777 San Bernardino East end of Bear Valley 2073 Comment
  UCR24398  Artemisia rothrockii John C. Roos 1940-8-3 1561 San Bernardino San Bernardino Mtns., east end of Bear Valley 2073 Comment
  POM266368  Artemisia rothrockii J. C. Roos 1940-8-3 1561 San Bernardino E end of Bear Valley Comment
  POM274206  Artemisia tridentata J. C. Roos 1947-9-19 2795 Inyo Panamint Mountain range, Telescope Peak, exposed ridge 3201 Comment
  POM274211  Artemisia tridentata J. C. Roos 1946-8-29 2768 San Bernardino Eagle Point, Bear Valley 2043 Comment
  POM274216  Artemisia tridentata J. C. Roos 1947-9-20 2807 Inyo Panamint Mountain Range, Wildrose Canyon 2378 Comment
  RSA44921  Asclepias fascicularis J. C. Roos 1949-6-21 3699 San Bernardino roadside, Cushenbury Canyon, north base of San Bernardino Mtns. 1677 Comment
  UCSB46872  Asparagus officinalis J. C. Roos 1965-9-19 San Bernardino collected along Loma Linda Loma Linda Comment
  UCR23353  Asplenium vespertinum John C. Roos 1942-3-28 1087 San Bernardino San Bernardino Valley, Canyon above plateau, Reche Canyon, near Loma Linda Comment
  RSA47462  Aster ascendens J. C. Roos 1949-7-16 4562 San Bernardino Moonridge Ski Area, Bear Valley. 2226 Comment
  RSA69827  Aster bernardinus J. C. Roos 1951-10-19 5323 Riverside San Timoteo Canyon, El Casco. 610 Comment
  RSA155741  Aster bracteolatus J. C. Roos 1955-8-28 6570 Inyo On the West side of Owens Lake, 3 miles North of Olancha 1091 Comment
  CLARK-A1528-1604  Aster carnosus John C. Roos 1956-8-2 6591 San Bernardino San Bernardino Valley 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-A1528-1605  Aster chilensis John C. Roos 1946-9-14 3014 Riverside San Jacinto Mountains 1371 Comment
  POM274194  Aster frondosus J. C. Roos 1946-8-29 2780 San Bernardino Eagle Point, Bear Valley. 2043 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
  CLARK-A1528-1610  Aster hesperius John C. Roos 1951-9-25 5258 Riverside Fairmont Park 259 Comment
  CLARK-A1528-1611  Aster intricatus John C. Roos 1946-9-21 3064 San Bernardino Mojave Desert Comment
  UCR18857  Aster pauciflorus John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Tecopa 427 Comment
  UCR18986  Astragalus aridus John C. Roos 1949-3-19 4116 Riverside Sonoran (Colorado) Desert, sand dunes west of Indio Comment
  POM302495  Astragalus asymmetricus J. C. Roos 1940-6-8 1909 Fresno About 25 miles west of Fresno. Comment
  UCSB42211  Astragalus atratus Roos, John; Munz, Philip 1955-4-8 Inyo Last Chance Mtns., east of the Eureka Valley sand dunes 1219 Comment
  UCR23959  Astragalus bicristatus John C. Roos 1937-7-28 1947 San Bernardino San Bernardino Mtns, Van Deusen Canyon [Caribou Creek], near Bear Valley 2195 Comment
  RSA71716  Astragalus calycosus J. C. Roos, L. Roos 1952-7-26 5822 Inyo East side Reed Flat at head of Birch Creek, White Mtns. 3049 Comment
  RSA79694  Astragalus calycosus J. C. Roos, A. R. Roos 1953-8-9 5958 Inyo Near head of Tamarack Canyon 3049 Comment
  UC1236233  Astragalus casei John C. Roos 1955-5-15 6373 Inyo 0.5 mi w Willow Spring (Last Chance Mts.); , w of Willow Spring 1767 Comment
  UCR23960  Astragalus coccineus John C. Roos 1942-5-1 1115 San Bernardino Mojave Desert, Little San Bernardino Mtns., Quail Springs 1159 Comment
  CLARK-A1528-2734  Astragalus crotalariae John C. Roos 1949-4-6 4156 Imperial Salton Sea Comment
  UCR25919  Astragalus crotalariae John C. Roos, Lucille Roos 1949-4-6 4156 Imperial Sonoran (Colorado) Desert, saline flats near Frink -55 Comment
  CLARK-A1528-2735  Astragalus didymocarpus John C. Roos 1938-4-28 1618 Riverside La Sierra Comment
  CLARK-A1528-1157  Astragalus douglasii John C. Roos 1937-6-14 1465 San Diego Descanso 1036 Comment
  POM274197  Astragalus douglasii var. parishii J. C. Roos 1946-9-27 2788 Riverside Santa Rosa Mtns. 2226 Comment
  CAS-BOT-BC186870  Astragalus gilmanii John Roos; Lucille Roos 1947-7-13 2887 Inyo Arcane Meadows, Panamint Mts. 3048 Comment
  RSA40580  Astragalus gilmanii J. C. Roos 1947-7-13 2887 Inyo Arcane Meadows, Panamint Mountains. 3049 Comment
  UCR18975  Astragalus gilmanii John C. Roos 1948-7-4 3898 Inyo Northern Mojave Desert, Panamint Mountains, Mahogany Flats 2470 Comment
  CLARK-A1528-2744  Astragalus gilmanii John C. Roos 1948-7-4 3898 Inyo Panamint Mountains 2468 Comment
  CLARK-A1528-2745  Astragalus insularis var. harwoodii John C. Roos 1949-4-10 4222 Riverside Chuckwalla Mountains Comment
  UCR18937  Astragalus insularis var. harwoodii John C. Roos, Lucille Roos 1949-4-10 4222 Riverside Sonoran (Colorado) Desert, N base of the Chuckwalla Mountains Comment
  UCR18994  Astragalus insularis var. harwoodii John C. Roos, Lucille Roos 1949-4-11 4241 Riverside Sonoran (Colorado) Desert, Chuckwalla Mountains, Corn Spring Comment
  RSA157085  Astragalus inyoensis J. C. Roos 1955-6-19 6433 Inyo One mile south of Willow Springs, Last Chance Mountains 2195 Comment
  UCR18974  Astragalus kentrophyta John C. Roos 1967-8-5 s.n. Inyo White Mtns, Crest of range, east of Badger Flat Comment
  CLARK-A1528-5094  Astragalus kentrophyta subsp. implexus John C. Roos 1952-7-26 5820 Inyo White Mountains 3047 Comment
  CLARK-A1528-5095  Astragalus kentrophyta subsp. implexus John C. Roos 1951-8-9 5124 Inyo White Mountains 3169 Comment
  CLARK-A1528-6100  Astragalus kentrophyta subsp. implexus John C. Roos 1967-8-5 Inyo Inyo Mountains Comment
  NY675228  Astragalus kentrophyta var. elatus J. C. Roos 1952-7-26 5820 Inyo East side Reed Flat at head of Birch Creek, White Mountains 3048 Comment
  RSA74601  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
  UCR23906  Astragalus layneae John C. Roos, L. Roos 1955-4-7 6300 Inyo Northern Mojave Desert, N end of Saline Valley near Waucoba Wash 1616 Comment
  CLARK-A1528-4958  Astragalus lentiginosus John C. Roos 1947-4-19 3465 Inyo Death Valley National Park Comment
  CLARK-A1528-7805  Astragalus lentiginosus var. borreganus John C. Roos 1949-4-7 4166 Imperial Comment
  RSA45524  Astragalus lentiginosus var. borreganus J. C. Roos, Lucille Roos 1949-4-7 4166 Imperial West of Yuma Sand Dunes, near All American Canal. 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
  RSA44247  Astragalus minthorniae var. villosus J. C. Roos 1949-5-29 3540 San Bernardino Greene Mine, N side of Clark Mtn. 1585 Comment
  CAS-BOT-BC178071  Astragalus nuttallianus J. C. Roos 1958-3-15 s.n. Riverside 3 miles S.E. of Desert Center, in the Chuckwalla Mtns. Comment
  UCR26496  Astragalus oophorus John C. Roos 1947-7-13 2831 Inyo Northern Mojave /Great Basin Desert, Panamint Mtns, Arcane Meadows, between Baldy [=Rogers?] and Telescope Peaks 3018 Comment
  UCR30500  Astragalus oophorus John C. Roos, A. R. Roos 1953-8-11 5987 Inyo N Mojave Desert, Inyo Mtns: 2 mi east of Blue Bell Mine 2866 Comment
  CLARK-A1528-2754  Astragalus oophorus John C. Roos 1952-7-29 5857 Inyo White Mountains 3078 Comment
  POM262991B  Astragalus palmeri J. C. Roos 1937-6-10 492 San Diego Summit above Mountain Spring(s). Comment
  CAS-BOT-BC192811  Astragalus platytropis J. C. Roos; A. R. Roos 1953-8-9 5961 Inyo Near head of Tamarack Canyon, Inyo Mts. 3078 Comment
  CAS-BOT-BC192812  Astragalus platytropis J. C. Roos 1955-7-21 6481 Inyo On north slope Whitetop Peak, Last Chance Mountains 2499 Comment
  UC1023404  Astragalus platytropis J. C. and A. R. Roos 1953-8-9 5961 Inyo near head Tamarack Canyon (Inyo Mts.); , near head Tamarack Canyon 3078 Comment
  CLARK-A1528-2755  Astragalus pomonensis John C. Roos 1965-6-27 San Bernardino Loma Linda 304 Comment
  RSA79695  Astragalus purshii var. lectulus J. C. Roos, A. R. Roos 1953-8-9 5957 Inyo Tamarack Canyon 3048 Comment
  RSA105023  Astragalus serenoi J. C. Roos 1955-5-15 6372 Inyo Last Chance Mountains: 0.5 miles west of Willow Springs. 1767 Comment
  UC1080611  Astragalus serenoi var. shockleyi John C. Roos 1955-5-15 6372 Inyo 0.5 mi w Willow Spring (Last Chance Mts., along edge gravelly rocky wash); Last Chance Mts., w of Willow Spring 1767 Comment
  RSA450305  Astragalus tricarinatus J. C. Roos 1948-5-8 3826 Riverside Whitewater. 518 Comment
  CLARK-A1528-1158  Astragalus trichopodus subsp. antisellii John C. Roos 1937-3-26 694 Kern 152 Comment
  RSA44239  Astrolepis cochisensis subsp. cochisensis J. C. Roos 1949-5-29 3532 San Bernardino North side of Clark Mountain 1463 Comment
  CLARK-A1528-2535  Atriplex argentea John C. Roos 1947-7-21 Los Angeles Lancaster Comment
  RSA79495  Atriplex canescens J. C. Roos, A. Roos 1953-8-14 6031 Inyo Al Rose Canyon; Inyo Mts. 2134 Comment
  UCR18888  Atriplex canescens Alfred R. Roos 1948-9-15 s.n. Los Angeles Transverse Range/Mojave Desert, Mint Canyon, south of Palmdale Comment
  CLARK-A1528-2545  Atriplex confertifolia John C. Roos 1938-4-18 Inyo Death Valley National Park Comment
  GH376344  Atriplex confertifolia J. C. Roos & A. R. Roos 1953-8-10 5978 Unknown Mazourka Canyon, Inyo Mts. 2438 Comment
  LA102330  Atriplex confertifolia John C. Roos; 1949-5-14 4307 San Bernardino Rabbit Spring, Lucerne Valley Comment
  UCSB42261  Atriplex coronata Roos, John 1965-6-30 Riverside Perris Comment
  RSA591763  Atriplex coronata var. notatior J. C. Roos 1965-6-30 s.n. Riverside Perris. Comment
  SEINET3931219  Atriplex coronata var. notatior John Roos 1952-1 Riverside Comment
  UCR24121  Atriplex coronata var. notatior John C. Roos 1965-6-30 s.n. Riverside Perris-Aguanga Basin region, Perris Comment
  CLARK-A1528-1190  Atriplex elegans subsp. fasciculata John C. Roos 1965-7-6 San Bernardino Barstow Comment
  CLARK-A1528-2514  Atriplex elegans subsp. fasciculata John C. Roos 1949-4-6 4141 Imperial Pope Hot Springs Comment
  CLARK-A1528-6886  Atriplex elegans subsp. fasciculata John C. Roos 1965-7-6 San Bernardino Barstow Comment
  SEINET4133816  Atriplex elegans subsp. fasciculata Roos 1965-7-6 s.n. San Bernardino Roadside of Barstow.; 0 Comment
  CLARK-A1528-2520  Atriplex hymenelytra John C. Roos 1947-2-1 3221 Riverside Painted Canyon Comment
  CLARK-A1528-2521  Atriplex hymenelytra John C. Roos 1937-12-28 Inyo Olancha Comment
  CAS-BOT-BC169156  Atriplex lentiformis John Roos 1950-10-31 5022 San Bernardino 237 South Waterman Ave., San Bernardino 320 Comment
  GH376424  Atriplex lentiformis J. C. Roos 1950-10-31 5022 Unknown 237 South Waterman Ave. 320 Comment
  RSA92770  Atriplex lentiformis J. C. Roos, L. Roos 1954-10-2 6252 San Bernardino 237 S Waterman. 320 Comment
  UCR24122  Atriplex minuscula John C. Roos 1940-6-8 1910 Fresno San Joaquin Valley, about 25 mi west of Fresno Comment
  CLARK-A1528-5408  Atriplex parryi John C. Roos 1950-4-7 4726 Inyo Tecopa 426 Comment
  RSA658705  Atriplex parryi J. C. Roos 1965-7-11 s.n. Inyo Amargosa River. Comment
  RSA92759  Atriplex parryi J. C. Roos, A. Roos 1954-8-15 6226 Inyo Lower Warm Spring, Saline Valley. 427 Comment
  CLARK-A1528-2500  Atriplex phyllostegia John C. Roos 1940-6-25 1891 Kern Bakersfield Comment
  UC1042968  Atriplex phyllostegia John and Lucille Roos 1954-5-6 6074 Inyo Amargosa River 4 mi n Shoshone; Amargosa River n of Shoshone 518 Comment
  CAS-BOT-BC176549  Atriplex polycarpa J. C. Roos 1965-7-6 s.n. San Bernardino At the cement plant, Victorville Comment
  RSA662437  Atriplex polycarpa J. C. Roos 1965-7-6 1965 San Bernardino At the cement plant, Victorville. Comment
  UCR18898  Atriplex polycarpa Alfred R. Roos 1948-9-15 s.n. Los Angeles Transverse Range/Mojave Desert, Mint Canyon, south of Palmdale Comment
  RSA52770  Atriplex prostrata J. C. Roos 1949-11-27 4701 Kern Monolith Dry Lake 1204 Comment
  RSA52771  Atriplex prostrata J. C. Roos, L. Roos 1950-7-24 4875 Kern Monolith Lake 1189 Comment
  CLARK-A1528-2502  Atriplex rosea Alfred R. Roos 1948-8-21 Los Angeles Long Beach Comment
  UCR18901  Atriplex rosea John C. Roos 1965-8-4 s.n. Riverside San Bernardino Valley, Arlington area, Riverside Comment
  CLARK-A1528-2501  Atriplex rosea John C. Roos 1949-11-27 4702 Kern Monolith Dry Lake 1203 Comment
  CLARK-A1528-401  Atriplex semibaccata John C. Roos 1951-9-25 5278 Riverside Riverside 259 Comment
  UCR25177  Atriplex triangularis John C. Roos, L. Roos 1950-11-21 5025 Kern Tehachapi Mtns., Monolith Dry Lake [= Proctor Lake], near Tehachapi Pass 1189 Comment
  UCR31331  Atriplex triangularis John C. Roos 1950-7-24 4879 Kern Tehachapi Mtns., Monolith Dry Lake [= Proctor Lake] 1189 Comment
  UCR24109  Atriplex truncata John C. Roos 1950-6-24 4844 San Bernardino Mojave Desert, Rabbit Springs 884 Comment
  CLARK-A1528-4494  Avena barbata John C. Roos, Lucille Roos 1950-4-15 4738 Riverside Box Springs Mountains 457 Comment
  RSA0034604  Avena barbata J. C. Roos 1965-6-6 s.n. San Bernardino Mill Creek. San Bernardino Mountains. Comment
  CLARK-A1528-1269  Avena sativa John C. Roos 1939-4-16 257 Napa Angwin Comment
  CLARK-A1528-4071  Azolla filiculoides John C. Roos 1947-2-27 3269 San Bernardino Colton Comment
  RSA431203  Baccharis brachyphylla J. C. Roos 1958-9-27 s.n. Riverside Carrizo Creek near Black Hhill, Santa Rosa Mtns 915 Comment
  RSA45533  Baccharis brachyphylla J. C. Roos 1949-4-2 4133 Riverside Near Palm oasis in the side canyon of Whitewater Canyon. 549 Comment
  RSA89967  Baccharis brachyphylla J. C. Roos 1950-10-15 5008 Riverside San Bernardino Mtns. Dry Morongo Canyon, c. l mi south of Riverside-San Bernardino county line. 612 Comment
  CLARK-A1528-2037  Baccharis emoryi John C. Roos 1940-9-1 240 San Bernardino Reche Canyon Comment
  UCR30559  Baccharis glutinosa John C. Roos 1948-8-28 3959 Sonoma North Coast Ranges, near Healdsburg 31 Comment
  RSA48878  Baccharis salicifolia J. C. Roos 1949-9-21 4664 Riverside Reche Canyon, 2.7 miles south of Hollow Hill Dairy 457 Comment
  CLARK-A1528-1630  Baccharis sarothroides John C. Roos, Lucille Roos 1950-8-19 4937 San Diego Hodges Dam 121 Comment
  UCR23307  Baccharis sarothroides John C. Roos, L. Roos 1950-10-28 5021 Riverside Box Springs 473 Comment
  UCSB42282  Baccharis sarothroides Roos, John 1965-9-18 Inyo Wild Rose Canyon, Panamint Mtns. Comment
  CLARK-A1528-1631  Baccharis sergiloides John C. Roos 1949-9-17 4660 Riverside Whitewater Wash 609 Comment
  UCR19179  Baccharis sergiloides John C. Roos 1948-9-14 3003 Riverside Santa Rosa Mtns, Dos Palmas Spring, east of Asbestos Mountain 1070 Comment
  CLARK-A1528-1641  Bahia dissecta John C. Roos 1946-8-27 2923 Riverside Santa Rosa Mountains 2285 Comment
  RSA450760  Bahiopsis parishii J. C. Roos 1965-9-26 s.n. Riverside Santa Rosa Mtns. 701 Comment
  UCR25401  Baileya pleniradiata John C. Roos 1946-10-4 3125 San Bernardino Mojave Desert, Lone Star Ranch [Yucca Valley; the site of a gas station north of Joshua Tree Nat. Mon.] Comment
  UCR23598  Barbarea orthoceras John C. Roos 1947-6-14 3673 San Bernardino San Bernardino Mtns, near Crestline, behind the Crestline Bowl 1433 Comment
  UCSB45938  Bassia hyssopifolia Roos, John 1965-7-3 San Bernardino Loma Linda Comment
  CLARK-A1528-1650  Bellis perennis John C. Roos 1966-3-6 San Bernardino Redlands Comment
  CHSC127  Berberis aquifolium var. dictyota F. Roos 1930-4-5 Butte Paradise. 548 Comment
  CLARK-A1528-2274  Berberis dictyota John C. Roos 1947-1-4 3197 Riverside Reche Canyon 487 Comment
  CLARK-A1528-7860  Berberis dictyota John C. Roos 1940-2-17 890 Riverside Reche Canyon Comment
  CAS-BOT-BC75740  Berberis nevinii John C. Roos 1949-5-6 3526 San Bernardino San Timoteo Canyon, south of Redlands. Comment
  CLARK-A1528-2269  Berberis nevinii John C. Roos 1966-2-10 Riverside San Timoteo Canyon Comment
Read comments
Mar 12 2014
  CLARK-A1528-5129  Berberis nevinii John C. Roos 1950-2-11 4705 San Bernardino Scott's Canyon 426 Comment
  RSA659182  Berberis nevinii J. C. Roos 1966-2-10 s.n. San Bernardino San Timoteo Canyon, south of Redlands. Comment
  SBBG28470  Berberis nevinii J. C. Roos 1949-3-6 3525 San Bernardino branch of San Timoteo Cyn, S of Redlands 426 Comment
  UCD94995  Berberis nevinii J. C. Roos 1966-2-10 s.n. San Bernardino San Timoteo Canyon, south of Redlands. Comment
  UCR18762  Berberis nevinii John C. Roos 1947-4-12 3564 San Bernardino San Bernardino Valley, San Timoteo Canyon, 1.3 mi SE of Redlands Station Comment
  UCR18794  Berberis nevinii John C. Roos 1949-5-21 4321 Riverside Peninsular Range, SW corner of county, 2 miles north of Dripping Springs, near Vail Dam 442 Comment
  UCSB46877  Berberis nevinii Roos, John 1966-2-10 San Bernardino San Timoteo Canyon, south of Redlands Comment
  HSC78521  Bergia texana J. C. Roos 1952-5-28 5730 Riverside San Jacinto River bottomland, 1 mi. SE of Perris. 427 Comment
  CLARK-A1528-1651  Bidens frondosa John C. Roos, Lucille Roos 1954-10-9 6254 Ventura Lake Sherwood 300 Comment
  POM251754  Boerhavia J. C. Roos 1937-8-20 12 Riverside East of Desert Center. Comment
  CLARK-A1528-3264  Boerhavia annulata John C. Roos, Lucille Roos 1954-11-24 6261 Inyo Inyo Mountains 563 Comment
  CLARK-A1528-3265  Boerhavia annulata John C. Roos 1955-4-6 6290 Inyo Inyo Mountains 487 Comment
  CLARK-A1528-5369  Boerhavia annulata John C. Roos, Lucille Roos 1954-11-24 6261 Inyo Inyo Mountains 563 Comment
  RSA104837  Boerhavia annulata J. C. Roos 1955-5-13 6350 Inyo West base Last Chance Mountains northeast of Eureka Valley sand dunes. 1159 Comment
  RSA78222  Boerhavia intermedia J. C. Roos, L. Roos 1952-10-18 5901 Riverside Hidden Valley Campground 1220 Comment
  CAS-BOT-BC434563  Boerhavia wrightii John Roos; Lucille Roos 1950-10-21 5018 San Bernardino Twenty-nine Palms, Mohave Desert. 579 Comment
  UC1010320  Boerhavia wrightii John and Lucille Roos 1950-10-21 5018 San Bernardino Mohave Desert, Twenty-nine Palms 579 Comment
  RSA450459  Bothriochloa barbinodis J. C. Roos 1965-10-10 s.n. San Diego Otay Lake Comment
  UCR23964  Bothriochloa barbinodis John C. Roos 1946-9-14 3027 Riverside Santa Rosa Mtns, E of Pinyon Flats 1159 Comment
  CAS-BOT-BC145587  Bouteloua aristidoides J. C. Roos 1965-9-5 s.n. Riverside Desert Center. 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
  UCSB51403  Bouteloua aristidoides John C. Roos 1946-9-14 3026 Riverside collected in in the Inyon Flats, in the Santa Rosa Mountains Pinyon Flats 1219 Comment
  CLARK-A1528-4510  Bouteloua barbata John C. Roos 1950-9-1 4950 San Bernardino Valley Well Station 1127 Comment
  CLARK-A1528-4512  Bouteloua barbata John C. Roos 1946-9-14 3025 Riverside San Jacinto Mountains 1219 Comment
  RSA157908  Bouteloua barbata J. C. Roos, A. R. Roos 1955-8-23 6531 Inyo Canyon at West base Last Chance Mountains, east of Eureka Valley sand dunes. 1220 Comment
  UCR23972  Bouteloua barbata John C. Roos 1946-9-14 3025 Riverside Santa Rosa Mtns., Pinyon Flats 1220 Comment
  UCSB42284  Bouteloua barbata John C. Roos 1965-9-5 Riverside collected 18.0 mi W Blythe - Blythe Comment
  CAS-BOT-BC145605  Bouteloua barbata var. barbata J. C. Roos 1965-9-5 s.n. Riverside 18 miles west of Blythe. Comment
  RSA41332  Bouteloua curtipendula J. C. Roos 1948-5-2 1122 Riverside Wonderland of Rocks, Joshua Tree National Monument. Comment
  UCR23974  Bouteloua curtipendula John C. Roos 1949-6-22 4442 San Bernardino Eastern Mojave Desert, New York Mountains, north side of the mouth of Keystone Canyon 1677 Comment
  LA102207  Bouteloua eriopoda John C. Roos; 1958-9-28 sn Riverside Santa Rosa Mountains, Abestos Spring, Pinon Flats 1219 Comment
  UC1023428  Bouteloua eriopoda John C. Roos 1950-9-3 4975 San Bernardino canyon slope s Clark Mtn. (nw of Mountain Pass); eastern Mohave Desert 1828 Comment
  CLARK-A1528-4524  Bouteloua gracilis John C. Roos 1949-9-18 4062 San Bernardino Clark Mountain 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
  CLARK-A1528-1662  Brickellia californica John C. Roos 1949-9-3 4649 Inyo Kingston Mountains 1523 Comment
  RSA450418  Brickellia californica J. C. Roos 1965-9-11 s.n. San Bernardino Mill creek, San Bernardino Mountains Comment
  UCR19543  Brickellia californica John C. Roos 1948-9-18 4057 San Bernardino Eastern Mojave Desert, north slope of Clark Mountain 1829 Comment
  CLARK-A1528-2039  Brickellia desertorum John C. Roos 1950-9-30 4994 Riverside Box Springs Mountains 457 Comment
  GH386537  Brickellia desertorum J. C. Roos & L. Roos 1950-9-30 4994 Unknown north base of Pigeon Pass, Box Springs Mts. 457 Comment
  RSA48847  Brickellia desertorum J. C. Roos 1949-9-21 4665 Riverside E slope of rocky ridge in pass between Reche Canyon & Pigeon Pass 457 Comment
Read comments
Dec 5 2014
  RSA89879  Brickellia desertorum J. C. Roos, L. Roos 1950-10-14 5006 Riverside E end Jurupa Hills, near corner of Alta & Canal Sts. 305 Comment
  UCR20317  Brickellia desertorum John C. Roos 1949-9-17 4662 Riverside San Bernardino Mtns / Sonoran (Colorado) Desert, E side Whitewater Canyon, 2.2 mi. north of Hwy 99 [=I-10]; W side of Painted Hill 612 Comment
  UCR25197  Brickellia desertorum John C. Roos 1950-12-2 5029 Riverside Sonoran (Colorado) Desert, Eagle Mountains, Munsen ['Monson'] Canyon 1067 Comment
  CLARK-A1528-1673  Brickellia incana John C. Roos 1947-11-1 3751 Riverside Eagle Mountains Comment
  RSA450417  Brickellia incana J. C. Roos 1961-10-22 s.n. Inyo West side of Owens Lake, near Columbia Southern Chemical Company. Comment
  UC1043017  Brickellia longifolia John and Lucille Roos 1954-3-27 6058 Inyo Klare Spring, Titus Canyon, Grapevine Mts. Death valley. 914 Comment
  RSA34194  Brickellia microphylla J. C. Roos 1947-9-18 2793 Inyo Wildrose Canyon at Kilns Comment
  RSA79496  Brickellia microphylla J. C. Roos, A. R. Roos 1953-8-14 6029 Inyo Al Rose Canyon, Inyo Mountains. 2134 Comment
  CAS-BOT-BC127658  Brickellia microphylla var. microphylla J. C. Roos; A. R. Roos 1955-8-23 6526 Inyo dry rocky canyon along Loretto road 2 miles S.W. of Loretto mine, east slope Inyo Mts. 1676 Comment
  RSA34192  Brickellia multiflora J. C. Roos 1947-9-20 2813 Inyo Emigrant Wash above Emigrant Spring. Panamint Mts. Comment
  RSA34195  Brickellia multiflora J. C. Roos 1947-9-18 2792 Inyo Wildrose Canyon, Panamint Mts. 1067 Comment
  RSA79494  Brickellia multiflora J. C. Roos, A. R. Roos 1953-8-14 6032 Inyo Mazourka Canyon, Inyo Mts. 1768 Comment
  CLARK-A1528-1683  Brickellia multiflora John C. Roos 1947-9-18 2792 Inyo Panamint Mountains 1066 Comment
  CLARK-A1528-2038  Brickellia multiflora John C. Roos 1956-9-30 6603 Inyo Panamint Range Comment
  UCR19493  Brickellia oblongifolia John C. Roos 1949-6-27 4519 San Bernardino Eastern Mojave Desert, north side of Kingston Mtns 2134 Comment
  UCR30626  Brickellia oblongifolia John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Panamint Mtns: Wildrose Canyon at and below the Charcoal Kilns 2134 Comment
  CLARK-A1528-5013  Brickellia oblongifolia var. linifolia John C. Roos 1949-6-27 4519 San Bernardino Kingston Mountains 1767 Comment
  RSA47470  Brickellia oblongifolia var. linifolia J. C. Roos 1949-5-28 4335 San Bernardino North slope of washes, Clark Mtn, near Green's Mine 1616 Comment
  RSA79664  Brickellia oblongifolia var. linifolia J. C. Roos, A. R. Roos 1953-8-8 5944 Inyo NW rim of Badger Flat, Inyo Mts. 2591 Comment
  UCD129645  Brickellia oblongifolia var. linifolia J. C. Roos 1946-8-27 2917 Riverside Santa Rosa Mountain. 1371 Comment
  UCR23970  Briza maxima John C. Roos 1957-7-2 6636 Mendocino Point Arena Lighthouse, on the coast 15 Comment
  POM266487  Briza maxima J. C. Roos 1940-6-14 834 Monterey In pine forest. 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
  CLARK-A1528-2793  Brodiaea lutea var. anilina John C. Roos 1951-5-27 5049 Mariposa Mariposa 1005 Comment
  UCR25753  Brodiaea terrestris subsp. kernensis John C. Roos 1937-7-31 2349 San Bernardino Transverse Ranges/San Bernardino Mtns, Twin Peaks Post Office 1768 Comment
  RSA44263  Bromus arenarius J. C. Roos 1949-6-22 3547 San Bernardino New York Mountains; Keystone Canyon 1738 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
  RSA450462  Bromus berteroanus J. C. Roos 1969-5-10 s.n. Kern An alkaline seep in Red Rock Canyon. Comment
  CLARK-A1528-4532  Bromus carinatus John C. Roos 1937-6-18 1239 San Diego Palomar Mountain Comment
  CAS-BOT-BC148734  Bromus carinatus var. marginatus J. C. Roos 1965-7-17 s.n. San Bernardino San Bernardino Mountains. Barton Flats. Comment
  CAS-BOT-BC148735  Bromus carinatus var. marginatus J. C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mountains. Moonridge, Bear Valley. Comment
  UCSB51398  Bromus carinatus var. marginatus Roos, John 1965-6-26 San Bernardino Upper Santa Ana Canyon near Heart Bar Park, San Bernardino Mtns. Comment
  UCSB51392  Bromus catharticus Roos, A. 1937-11-13 Riverside San Bernardino Basin region, Riverside 243 Comment
Read comments
May 21 2011
  UCR19657  Bromus hallii John C. Roos 1965-7-17 s.n. San Bernardino San Bernardino Mtns, Stetson Creek, Barton Flats 1951 Comment
  LA102184  Bromus japonicus John C. Roos; 1950-6-11 4830 San Bernardino Loma Linda, W central 304 Comment
  UCR23962  Bromus japonicus John C. Roos 1950-6-11 4830 San Bernardino San Bernardino Valley, Loma Linda, W Central Street 305 Comment
  UCSB71632  Bromus madritensis subsp. rubens Roos, J. 1965-6-6 San Bernardino Mill Creek, San Bernardino Mtns, near Fallsvale Comment
  CLARK-A1528-4542  Bromus marginatus John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1274  Bromus porteri John C. Roos, Lucille Roos 1951-8-8 5095 Inyo White Mountains 3169 Comment
  CLARK-A1528-4550  Bromus rubens John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4552  Bromus rubens John C. Roos 1937-5-1 1409 Riverside La Sierra Comment
  RSA0019812  Bromus tectorum J. C. Roos 1937-5-9 2087 San Bernardino Oak Glen, San Bernardino Mountains. 1220 Comment
  CLARK-A1528-4560  Bromus trinii John C. Roos 1969-5-10 Kern Red Rock Canyon Comment
  CLARK-A1528-4561  Bromus trinii John C. Roos, Lucille Roos 1953-3-21 5909 Riverside Andreas Canyon 274 Comment
  UC1023393  Bromus trinii John and Lucille Roos 1953-3-21 5909 Riverside s of Palm Springs (mouth of Andreas Canyon); Andreas Canyon 274 Comment
  UC1043018  Bromus trinii John and Lucille Roos 1952-5-24 5711 Riverside hills n of Moreno 518 Comment
  UCR23981  Bromus trinii John C. Roos 1969-5-10 s.n. Kern Western Mojave Desert, Red Rock Canyon 793 Comment
  UCR23982  Bromus trinii John C. Roos 1962-3-24 s.n. Riverside San Bernardino Mtns., Whitewater Canyon 854 Comment
  CLARK-A1528-3811  Calandrinia ambigua John C. Roos 1949-5-5 4098 Riverside Orocopia Comment
  CLARK-A1528-2363  Callitriche marginata John C. Roos 1952-4-16 5540 Riverside Edgemont Comment
  UCSB45513  Callitriche palustris Roos, John 1957-7-2 Sonoma Miller's Ridge Comment
  UCR25305  Callitriche verna John C. Roos 1957-7-2 6644 Sonoma Miller Ridge Comment
  CLARK-A1528-5066  Calocedrus decurrens John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  RSA664194  Calocedrus decurrens J. C. Roos 1965-6-6 s.n. San Bernardino Mill Creek. San Bernardino Mountains. Comment
  UC1234869  Calochortus bruneaunis J. C. Roos 1955-6-17 6410 Inyo 2 mi ne Willow Spring; Last Chance Mountains 2011 Comment
  CAS-BOT-BC132310  Calochortus catalinae J. C. Roos 1956-4-8 6573 Ventura North slope of Bony Mtn., Potrero Valley Comment
  CLARK-A1528-3187  Calochortus concolor John C. Roos, Lucille Roos 1952-6-14 5772 San Bernardino San Bernardino Mountains 1158 Comment
  CLARK-A1528-3189  Calochortus invenustus John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  UCR20333  Calochortus panamintensis John C. Roos, L. Roos 1954-6-25 6153 Inyo Inyo Mtns., North end of Badger Flat 2683 Comment
  UCR30501  Calochortus plummerae John C. Roos, L. Roos 1952-5-30 5733 Riverside One year old burn on hills of North Moreno between Moreno and Redlands. In branch of San Timoteo Canyon. 503 Comment
  UCR24141  Calochortus striatus John C. Roos 1969-5-10 s.n. Kern Western Mojave Desert, Red Rock Canyon 793 Comment
Read comments
Oct 23 2014
  UCR25934  Calystegia fulcrata John C. Roos 1949-7-16 4565 San Bernardino San Bernardino Mtns., Moonridge Ski Area, Bear Valley 2256 Comment
  CLARK-A1528-7873  Calystegia longipes John C. Roos 1952-6-8 5747 Riverside Reche Canyon 579 Comment
  UCR24124  Calystegia macrostegia John C. Roos 1950-4-22 4748 Riverside Pigeon Pass. 457 Comment
  UCR18965  Calystegia sepium subsp. binghamiae John C. Roos, L. Roos 1952-6-10 5763 Riverside San Bernardino Valley Region, Fairmont Park in Riverside, edge of lake 259 Comment
  CAS-BOT-BC199285  Calystegia sepium subsp. limnophila J. C. Roos; A. R. Roos 1950-8-7 4919 Riverside Riverbottom along Spring Brook between Lake Evans (Fairmont Park) and the Santa Ana River at the Mission Bridge, along bike path, vicinity of old Boy Scout camp 238 Comment
  RSA659475  Camissonia brevipes J. C. Roos 1949-4-9 4216 San Bernardino Whipple Mtns, NW of Crossroads. Comment
  UCR26167  Camissonia brevipes subsp. brevipes John C. Roos, Lucille Roos 1949-4-9 4216 San Bernardino Sonoran (Colorado) Desert, NW of Cross Roads, Whipple Mtns. 183 Comment
  RSA265815  Camissonia campestris subsp. campestris J. C. Roos 1937-3-25 2183 Kern plains below Grapevine. Comment
  RSA85156  Camissonia campestris subsp. campestris J. C. Roos 1952-4-22 5568 San Bernardino 1 mile west of Colton along highway 99. 305 Comment
  CLARK-A1528-3325  Camissonia cheiranthifolia Alfred R. Roos 1956-5-22 Los Angeles 9 Comment
  CLARK-A1528-3350  Camissonia heterochroma John C. Roos, Alfred R. Roos 1954-8-14 6213 Inyo Inyo Mountains 2316 Comment
  RSA89048  Camissonia heterochroma J. C. Roos, A. R. Roos 1954-8-14 6213 Inyo 0.4 miles north of The Narrows, Marble Canyon, Inyo Mts. 2317 Comment
  CLARK-A1528-2660  Camissonia hirtella John C. Roos 1937-5-10 2187 Riverside Elsinore Comment
  CLARK-A1528-3330  Camissonia kernensis subsp. gilmanii John C. Roos 1952-4-22 5568 San Bernardino 304 Comment
  RSA45544  Camissonia palmeri J. C. Roos, Lucille Roos 1949-4-30 4253 San Bernardino Sandy flats 5 miles west of Lucerne Valley, Mojave Desert. Comment
  UCR23527  Camissonia pusilla John C. Roos 1955-5-15 6363 Inyo Northern Mojave Desert, Last Chance Mtns., 0.5 mi. west of Willow Spring 1768 Comment
  CLARK-A1528-3362  Camissonia strigulosa John C. Roos 1943-8-8 2703 Riverside San Jacinto Mountains 1615 Comment
  OBI33206  Camissoniopsis bistorta J. C. Roos 1947-3-15 3345 Riverside Valle Vista, San Jacinto Valley 549 Comment
  CLARK-A1528-1117  Capsella bursa-pastoris John C. Roos 1943-4-4 2619 San Bernardino San Bernardino 320 Comment
  UCD114528  Cardamine pensylvanica A. R. Roos 1958-6-12 s.n. Los Angeles Evans and Reeves Nursery. Brentwood, in west Los Angeles. Comment
  POM302513  Carex douglasii J. C. Roos 1943-10-16 2739 San Bernardino Little San Bernardino Mountains. 1524 Comment
  RSA41335  Carex douglasii J. C. Roos 1943-10-16 2739 Riverside Little San Bernardino Mountains. 1372 Comment
  RSA48687  Carex subfusca J. C. Roos 1949-8-13 4606 San Bernardino Copper Queen Mine, Keystone Canyon, New York Mountains 1829 Comment
  RSA664100  Carthamus tinctorius J. C. Roos, L. Roos 1956-9-2 6599 Sonoma Healdsburg dump Comment
  UCR18827  Cassiope mertensiana John C. Roos 1967-9-16 s.n. Inyo Sierra Nevada Mtns., Big Pine Creek on ridge below Palisade Glacier 3598 Comment
  CLARK-A1528-4081  Castela emoryi John C. Roos 1939-6-11 Imperial 91 Comment
  UCR24411  Castela emoryi John C. Roos 1937-8-20 1223 Riverside Sonoran (Colorado) Desert, Hayfields about 5-10 miles west of Desert Center Comment
  CLARK-A1528-5731  Castilleja affinis John C. Roos 1937-5-10 2075 Riverside Perris Comment
  UCR25604  Castilleja exserta John C. Roos 1952-4-16 5558 Riverside Box Springs Mountains, Pigeon Pass 457 Comment
  UCR25605  Castilleja exserta John C. Roos 1941-4-19 173 Riverside Peninsular Range, Loma Linda Hills/Box Springs Mtns.; plateau in Reche Canyon 671 Comment
  UCR24410  Castilleja lemmonii John C. Roos 1965-8-8 s.n. Fresno Sierra Nevada Mtns., Kearsarge Lake. Middle Section of Kings Canyon National Park 3354 Comment
  CLARK-A1528-4182  Castilleja miniata John C. Roos 1940-7-16 1853 San Bernardino San Bernardino Mountains Comment
  UC1234668  Castilleja minor subsp. minor J. C. and A. R. Roos 1955-8-28 6568 Inyo 3 mi n Olancha; Owens Lake 1091 Comment
  CLARK-A1528-1226  Castilleja nana Alfred R. Roos, John C. Roos 1953-8-9 5960 Inyo Inyo Mountains 3047 Comment
  RSA79692  Castilleja nana J. C. Roos, A. R. Roos 1953-8-9 5960 Inyo Near head of Tamarack Canyon 3049 Comment
  UC1023408  Castilleja nana J. C. and A. R. Roos 1953-8-9 5960 Inyo near head of Tamarack Canyon; Inyo Mountains 3048 Comment
  UCR23634  Caulanthus crassicaulis var. glaber John C. Roos 1949-6-21 4434 San Bernardino Eastern Mojave Desert, New York Mtns, Keystone Canyon. 1768 Comment
  UCR30594  Caulanthus heterophyllus var. heterophyllus John C. Roos, L. Roos 1954-4-10 6065 San Diego Peninsular Range, San Pasqual 152 Comment
  RSA89043  Caulostramina jaegeri J. C. Roos, L. Roos 1954-6-29 6185 Inyo Inyo Mountains; The Narrows, Marble Canyon 2195 Comment
  CLARK-A1528-3883  Ceanothus crassifolius John C. Roos 1942-3-7 1105 Los Angeles San Gabriel Mountains Comment
  CLARK-A1528-3897  Ceanothus oliganthus John C. Roos 1942-3-7 1106 Los Angeles La Canada Comment
  POM265805  Ceanothus oliganthus var. oliganthus J. C. Roos 1942-3-21 1097 Los Angeles Chantry Flats, Santa Anita Canyon Comment
  CLARK-A1528-3899  Ceanothus papillosus subsp. roweanus John C. Roos 1960-5-30 Orange Santa Ana Mountains 1066 Comment
  UCR23477  Ceanothus tomentosus subsp. olivaceus John C. Roos 1966-3-31 s.n. San Bernardino San Bernardino Valley, in the hills of San Timoteo Canyon, near Redlands Blvd 305 Comment
  CLARK-A1528-4384  Celtis reticulata John C. Roos 1962-5-7 San Bernardino Yucaipa 822 Comment
  RSA47313  Celtis reticulata J. C. Roos, L. Roos 1949-6-25 4493 San Bernardino Narrow canyon near spring, E face Clark Mountain. 1524 Comment
  UCR20322  Centaurea repens John C. Roos 1947-7-5 2908 Riverside junction of San Timoteo and Live Oak Creeks 459 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
  CLARK-A1528-5429  Centaurium calycosum John C. Roos 1965-7-11 Inyo Tecopa Comment
  CLARK-A1528-2946  Centaurium venustum John C. Roos 1952-6-13 5766 Riverside Reche Canyon 457 Comment
  CLARK-A1528-3940  Cephalanthus occidentalis var. californicus John C. Roos 1965-8-21 Tulare Sequoia National Park 609 Comment
  CAS-BOT-BC388159  Cerastium fontanum John C. Roos 1952-5-12 5658 San Bernardino Loma Linda 320 Comment
  POM265645  Cerastium fontanum subsp. vulgare J. C. Roos 1937-3-8 1303 San Bernardino Loma Linda, San Bernardino Valley. Comment
  RSA79649  Cercocarpus intricatus J. C. Roos, A. R. Roos 1953-8-10 5975 Inyo Inyo Mountains, Mazourka Canyon. 2470 Comment
  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
  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
  CAS-BOT-BC136946  Cercocarpus ledifolius var. intricatus J. C. Roos; A. R. Roos 1953-8-10 5975 Inyo Mazourka Canyon, Inyo Mts. 2468 Comment
  UC1042981  Cercocarpus ledifolius var. intricatus John and Lucille Roos 1954-6-26 6157 Inyo Tamarack Canyon Inyo Mts. 2743 Comment
  CLARK-A1528-7792  Chaenactis douglasii var. douglasii John C. Roos, Alfred R. Roos 1953-8-10 5974 Inyo Inyo Mountains 2560 Comment
  UCR20320  Chaenactis douglasii var. douglasii John C. Roos 1947-7-12 2897 Inyo Panamint Mtns., upper Wildrose Canyon, near Mahogany Flats 2409 Comment
  CLARK-A1528-1697  Chaenactis glabriuscula John C. Roos 1937-3-26 2478 Santa Barbara Cuyama Valley Comment
  RSA450414  Chaenactis santolinoides J. C. Roos 1965-6-26 s.n. San Bernardino San Bernardino Mountains probably near Barton Flats. Comment
  RSA155682  Chaenactis stevioides var. stevioides J. C. Roos 1955-6-20 6461 Inyo Last Chance Mtns near Willow Spring. 1768 Comment
  CAS-BOT-BC106012  Chaetadelpha wheeleri John C. Roos 1955-5-13 6357 Inyo Southeast end Eureka Valley 975 Comment
  UCR23737  Chaetadelpha wheeleri John C. Roos 1955-5-13 6357 Inyo Northern Mojave Desert, Eureka Valley dunes 976 Comment
  UCR23510  Chamaebatia foliolosa John C. Roos 1942-7-2 1259 Mariposa Sierra Nevada Mtns., Fresno Road out of Yosemite Park near Wawona 1220 Comment
  CAS-BOT-BC141751  Chamaebatiaria millefolium John Roos; Lucille Roos 1951-8-12 5188 Inyo 1 1/2 miles south of Reed Flat, White Mts. 2895 Comment
  CLARK-A1528-3584  Cheilanthes feei John C. Roos 1937-4-26 1800 San Bernardino Mitchell Caverns Comment
  UCR18784  Cheilanthes feei John C. Roos 1949-6-19 4400 San Bernardino Eastern Mojave Desert, Clark Mountain 1890 Comment
  CLARK-A1528-2554  Chenopodium album John C. Roos 1965-7-4 San Bernardino Loma Linda 304 Comment
  UCSB42266  Chenopodium fremontii Roos, John 1966-8-6 San Bernardino Cienega Seca Creek, Heart Bar Ranch, San Bernardino Mtns. Comment
  CLARK-A1528-2564  Chenopodium incanum John C. Roos 1950-9-1 4960 San Bernardino Clark Mountains 1645 Comment
  CLARK-A1528-2565  Chenopodium incanum John C. Roos 1937-8-25 1198 San Bernardino Barnwell 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
  UCR18972  Chenopodium incanum var. occidentale John C. Roos 1949-6-22 4456 San Bernardino Eastern Mojave Desert, New York Mtns, Barnwell 1494 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
  CLARK-A1528-5007  Chenopodium murale John C. Roos 1937-8-17 2408 Riverside San Jacinto Comment
  POM263023  Chenopodium pumilio J. C. Roos 1937-7-14 394 San Bernardino Santa Ana River near San Bernardino. Comment
  CLARK-A1528-1191  Chenopodium rubrum John C. Roos 1965-9-18 Inyo Inyo Mountains Comment
  UCR18970  Chenopodium rubrum John C. Roos 1965-9-18 s.n. Inyo Northern Mojave Desert, Darwin Mesa [=Darwin Plateau] Comment
  CLARK-A1528-5416  Chenopodium rubrum John C. Roos 1954-8-15 6223 Inyo Saline Valley 323 Comment
  UC1043009  Chenopodium rubrum John and Lucille Roos 1954-11-23 6258 Inyo Salt Lake Saline Valley (marsh at sw side) 323 Comment
  CLARK-A1528-7840  Chenopodium vulvaria John C. Roos 1948-9-1 3985 Siskiyou Fort Jones Comment
  UCR26295  Chimaphila menziesii John C. Roos 1949-7-2 4534 San Bernardino San Bernardino Mountains, Snow Canyon [=Rattlesnake Creek], Mill Creek 2134 Comment
  UCSB38063  Chorizanthe fimbriata var. fimbriata Roos, John 1965-6-16 Orange Dana Point near Doheney Beach. Comment
  CLARK-A1528-3607  Chorizanthe staticoides John C. Roos 1937-5-21 1804 Orange Lemon Heights Comment
  CLARK-A1528-3609  Chorizanthe watsonii John C. Roos 1949-4-30 San Bernardino Hesperia Comment
  UCR27545  Chorizanthe xanti John C. Roos 1948-5-8 3827 Riverside San Bernardino Mtns, Whitewater 579 Comment
  CLARK-A1528-2049  Chrysanthemum carinatum Alfred R. Roos 1956-5-23 Los Angeles El Segundo Comment
  CLARK-A1528-1764  Chrysanthemum coronarium John C. Roos 1956-5-5 6578 San Diego Comment
  CLARK-A1528-1765  Chrysanthemum leucanthemum John C. Roos 1966-6-26 San Bernardino Loma Linda Comment
  CLARK-A1528-1147  Chrysolepis sempervirens John C. Roos 1936-7-30 696 San Bernardino San Bernardino Mountains 2621 Comment
  CLARK-A1528-1699  Chrysothamnus albidus John C. Roos, Lucille Roos 1954-11-23 6259 Inyo Saline Valley 426 Comment
  CLARK-A1528-1702  Chrysothamnus albidus John C. Roos, Lucille Roos 1954-9-14 6235 Inyo 624 Comment
  UCR18814  Chrysothamnus albidus John C. Roos, L. Roos 1954-9-14 6232 Inyo Northern Mojave Desert, Amargosa River bottomland, 3 mi. south of Shoshone 433 Comment
  UCR19733  Chrysothamnus albidus John C. Roos, A. R. Roos 1954-8-15 6224 Inyo Northern Mojave Desert, Lower Warm Spring, Saline Valley 427 Comment
  CLARK-A1528-2048  Chrysothamnus albidus John C. Roos 1953-10-31 6034 Inyo Amargosa River 441 Comment
  RSA92774  Chrysothamnus albidus J. C. Roos 1954-11-23 6259 Inyo Lower Warm Spring, Saline Valley. 427 Comment
  UCR19473  Chrysothamnus depressus John C. Roos 1948-9-18 4061 San Bernardino Eastern Mojave Desert, north slope of Clark Mountain 1829 Comment
  CLARK-A1528-1720  Chrysothamnus nauseosus John C. Roos 1946-9-28 3097 San Bernardino San Bernardino Mountains 2255 Comment
  CLARK-A1528-1721  Chrysothamnus nauseosus John C. Roos 1950-10-11 5002 San Bernardino Cajon Pass 975 Comment
  CLARK-A1528-5463  Chrysothamnus nauseosus John C. Roos, Lucille Roos 1950-10-17 5010 San Bernardino Little Pigeon Pass 320 Comment
  UCR23785  Chrysothamnus nauseosus John C. Roos 1943-10-16 2738 Riverside Southern Mojave Desert, Falcon Flats, Little San Bernardino Mtns 1524 Comment
  POM262878  Chrysothamnus nauseosus subsp. bernardinus J. C. Roos 1941-8-23 119 San Bernardino Mill Creek at falls, San Bernardino Mts Comment
  POM262879  Chrysothamnus nauseosus subsp. bernardinus J. C. Roos 1941-8-23 118 San Bernardino Mill Creek at falls, San Bernardino Mts Comment
  CLARK-A1528-1018  Chrysothamnus nauseosus subsp. ceruminosus John C. Roos 1936-11-4 1528 San Bernardino Victorville 822 Comment
  RSA52775  Chrysothamnus nauseosus subsp. hololeucus J. C. Roos 1950-9-3 4972 San Bernardino Clark Mtn, south slope. 1890 Comment
  UCR23784  Chrysothamnus nauseosus subsp. hololeucus John C. Roos, L. Roos 1950-10-17 5010 San Bernardino San Bernardino Valley, Little Pigeon Pass, Barton Road c. 2 mi. west of Loma Linda 320 Comment
  RSA45475  Chrysothamnus nauseosus subsp. leiospermus J. C. Roos 1948-9-18 4060 San Bernardino N side of Clark Mtn 1829 Comment
  POM266287  Chrysothamnus parryi subsp. asper J. C. Roos 1941-10-18 858 San Bernardino Head of Rathbone Creek, San Bernardino Mts 2622 Comment
  RSA45495  Chrysothamnus parryi subsp. asper J. C. Roos, L. Roos 1948-9-7 3993 Mono Crestview. 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
  UC1234842  Chrysothamnus viscidiflorus subsp. puberulus J. C. and A. R. Roos 1955-8-24 6542 Inyo 1 mi ne Willow Spring; Last Chance Mts. 1859 Comment
  CAS-BOT-BC105966  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos 1961-10-22 s.n. Inyo Loretto Road, near Loretto Mine, east side of the Inyo Mtns. Comment
  POM261400  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos 1941-8-17 55 Inyo Telescope Peak, Panamint Mts 3366 Comment
  POM274205  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos 1947-9-19 2794 Inyo NE ridge of Telescope Peak, Panamint Mt 3140 Comment
  RSA155765  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos, A. R. Roos 1955-8-26 6553 Inyo N shoulder Waucoba Mts, Inyo Mts 3201 Comment
  RSA71768  Chrysothamnus viscidiflorus subsp. viscidiflorus J. C. Roos 1951-8-8 5113 Inyo SE rim Reed flat, White Mts 3079 Comment
  RSA79618  Chrysothamnus viscidiflorus var. puberulus J. C. Roos 1953-8-8 5933 Inyo Blue Bell Mine, Badger Flat, Inyo Mtns. 2683 Comment
  UCR18623  Chrysothamnus viscidiflorus var. puberulus John C. Roos, A. R. Roos 1954-8-14 6218 Inyo Northern Mojave Desert, Inyo Mountains, 2.5 miles NE of Andrews Mtn. 2378 Comment
  RSA45490  Chrysothamnus viscidiflorus var. puberulus J. C. Roos 1948-9-7 4017 Inyo 10 miles NW of Bishop Comment
  POM265632  Cicer arietinum J. C. Roos 1937-7-1 2395 Santa Barbara Solvang Comment
  UCR30574  Cirsium mohavense John C. Roos 1949-6-28 4528 Inyo Northern Mojave Desert, Tecopa, Amargosa River Valley 427 Comment
  UCR30572  Cirsium scariosum John C. Roos 1937-7-23 348 San Bernardino San Bernardino Mountains, Fish Creek, upper Santa Ana River 1982 Comment
  CLARK-A1528-1778  Cirsium vulgare John C. Roos 1965-7-21 San Bernardino Loma Linda Comment
  UC1234858  Cirsium vulgare J. C. Roos 1955-8-8 6525 San Bernardino Loma Linda 320 Comment
  RSA85121  Clarkia epilobioides J. C. Roos 1952-5-7 5618 Riverside Box Springs Mountains, north of Canyon Crest Heights 488 Comment
  RSA44917  Clarkia heterandra J. C. Roos 1947-6-14 3678 San Bernardino Shady canyon between Crestline Bowl and San Bernardino Mountains. Comment
  RSA449953  Clarkia purpurea subsp. quadrivulnera J. C. Roos 1965-6-12 s.n. San Bernardino Igo's near Mountain Home Village and Mill Creek. San Bernardino Mountains. [Note: Igo s is present location of Mountain Home Village, Hwy. 38, San Bernardino Mtns. -SDW 2006] Comment
  CLARK-A1528-3373  Clarkia unguiculata John C. Roos 1942-6-6 989 Los Angeles Placerita Canyon Comment
  CLARK-A1528-1292  Claytonia spathulata var. tenuifolia John C. Roos 1937-6-5 1474 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3850  Clematis ligusticifolia John C. Roos 1937-7-31 540 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3851  Clematis ligusticifolia John C. Roos 1965-10-7 Riverside Riverside Comment
  POM265656  Cleome lutea J. C. Roos 1937-8-6 1959 Inyo Big Pine. Comment
  RSA92729  Cleome lutea J. C. Roos, L. Roos 1954-6-29 6189 Inyo The Narrows of Marble Canyon, Inyo Mountains 2210 Comment
  RSA104821  Cleome sparsifolia J. C. Roos 1955-5-13 6358 Inyo SE end of Eureka Valley. 945 Comment
  CLARK-A1528-1168  Cleomella brevipes John C. Roos, R. Weatherby 1949-9-3 3565 Inyo Tecopa Hot Springs 426 Comment
  CLARK-A1528-2381  Cleomella brevipes John C. Roos 1954-9-14 6233 Inyo Amargosa Desert Comment
  RSA592492  Cleomella brevipes J. C. Roos, Weatherby 1949-9-3 3565 Inyo Tecopa Hot Springs 427 Comment
  RSA92762  Cleomella brevipes J. C. Roos 1954-9-14 6233 Inyo Amargosa Desert 3 miles NE of Death Valley Junction along Ash Meadows road 625 Comment
  CLARK-A1528-2382  Cleomella obtusifolia John C. Roos 1937-6-9 2384 San Diego Anza Borrego Desert State Park Comment
  UCR30862  Cleomella plocasperma John C. Roos 1947-6-21 3696 San Bernardino S Mojave Desert, Near Box 'S' Spring, Lucerne Valley 1082 Comment
  POM265655  Cleomella plocasperma J. C. Roos 1937-8-6 1960 Inyo Big Pine. Comment
  CAS-BOT-BC181000  Cneoridium dumosum John Roos; Lucille Roos 1954-4-10 6061 San Diego San Pasqual 152 Comment
  CLARK-A1528-1779  Cnicus benedictus John C. Roos 1937-4-17 1358 Riverside San Timoteo Canyon Comment
  CLARK-A1528-2203  Coldenia nuttallii John C. Roos 1937-8-6 1961 Inyo Big Pine Comment
  UCR19038  Collinsia callosa John C. Roos 1937-5-31 2032 Los Angeles San Gabriel Mtns., Below Big Pines Comment
  CLARK-A1528-5172  Collinsia childii John C. Roos 1953-6-18 5922 San Bernardino San Bernardino Mountains 1523 Comment
  RSA0117408  Collinsia concolor J. C. Roos 1952-4-13 5530 Riverside Box Springs Mts. 488 Comment
  POM263160  Collomia heterophylla J. C. Roos 1939-4-29 260 Napa Blake's Canyon, Howell Mt. Comment
  CLARK-A1528-3910  Colubrina californica John C. Roos 1949-4-10 4231 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-3911  Colubrina californica John C. Roos 1967-11-11 Riverside Chuckwalla Mountains Comment
  RSA45520  Condalia globosa var. pubescens J. C. Roos 1949-4-8 4184 Imperial near Midway Well. Comment
  UCR30529  Convolvulus arvensis John C. Roos 1952-6-4 5736 Riverside City of Riverside, near Citrus Experiment Station. Comment
  CLARK-A1528-196  Conyza canadensis John C. Roos 1951-9-17 5212 San Bernardino Loma Linda 320 Comment
  RSA450429  Conyza coulteri J. C. Roos 1965-10-10 s.n. San Diego Otay Lake Comment
  UCR19042  Cordylanthus eremicus subsp. eremicus John C. Roos 1941-8-17 76 Inyo Northern Mojave Desert, Panamint Mtns., Death Valley National Monument. Wildrose Canyon at the Charcoal Kilns Comment
  UCSB37370  Cordylanthus kingii subsp. helleri Roos, John 1958-8-30 Inyo Badger Flat, Inyo Mtns. Comment
  CAS-BOT-BC238206  Cordylanthus tecopensis John C. Roos 1954-7-18 6203 San Bernardino Saratoga Springs, Mohave [Mojave] Desert 60 Comment
  CLARK-A1528-4207  Cordylanthus tecopensis John C. Roos 1953-11-1 6035 Inyo Death Valley Junction 624 Comment
  CLARK-A1528-4209  Cordylanthus tecopensis John C. Roos, Alfred R. Roos 1954-7-18 6196 Inyo Death Valley Junction 624 Comment
  CLARK-A1528-5156  Cordylanthus tecopensis John C. Roos, Lucille Roos 1954-9-14 6231 Inyo Shoshone 432 Comment
  GH365877  Cordylanthus tecopensis J. C. Roos & L. Roos 1950-8-7 4929 Unknown Tecopa Hot Springs 426 Comment
  RSA85141  Cordylanthus tecopensis J. C. Roos 1953-11-1 6035 Inyo Amargosa desert, 3 miles NE of Death Valley Junction, on Ash Meadows Rd. 625 Comment
  UC1043014  Cordylanthus tecopensis John and Lucille Roos 1953-10-31 6033 Inyo 3 mi s Shoshone (along Amargosa River); Amargosa River 441 Comment
  CLARK-A1528-1788  Corethrogyne filaginifolia John C. Roos 1965-8-19 Riverside Beaumont Comment
  POM266288  Corethrogyne filaginifolia J. C. Roos 1937-8-11 2543 Los Angeles Gorman, Tehachapi Mts. Comment
  POM266289  Corethrogyne filaginifolia var. filaginifolia J. C. Roos 1942-9-12 1719 Los Angeles Westwood Village. Comment
  CLARK-A1528-7767  Cornus californica John C. Roos 1949-7-16 4557 San Bernardino San Bernardino Mountains 2255 Comment
  UCR19726  Coronopus didymus John C. Roos 1953-4-16 5913 San Bernardino San Bernardino Valley, Loma Linda 320 Comment
  CLARK-A1528-2437  Coronopus didymus John C. Roos 1957-5-20 6611 Los Angeles Los Angeles Comment
  CLARK-A1528-5385  Coronopus didymus John C. Roos 1953-4-16 5913 San Bernardino San Bernardino Valley 320 Comment
  CLARK-A1528-4009  Cowania mexicana var. stansburyana John C. Roos 1965-7-11 Inyo Panamint Range 2468 Comment
  CLARK-A1528-5524  Crepis capillaris John C. Roos 1950-4-22 4756 Riverside Reche Canyon 761 Comment
  RSA155646  Crepis intermedia J. C. Roos 1955-6-17 6401 Inyo 2 miles north of Willow Spring, Last Chance Mountains. 2011 Comment
  UC1234848  Crepis intermedia J. C. Roos 1955-6-17 6401 Inyo 2 mi ne Willow Spring; Last Chance Mountains 2011 Comment
  RSA79551  Crepis intermedia J. C. Roos 1953-8-11 5998 Inyo 2.5 miles east of Blue Bell Mine, Inyo Mts. 2988 Comment
  CLARK-A1528-2612  Cressa truxillensis John C. Roos 1952-5-21 5703 Riverside San Jacinto River 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
  UCR19009  Cressa truxillensis John C. Roos 1949-5-14 4314 San Bernardino Southern Mojave Desert, 3 mi. west of Lucerne Valley 915 Comment
  CLARK-A1528-4992  Crossosoma bigelovii John C. Roos 1948-4-24 3803 Riverside Whitewater 609 Comment
  UCR25850  Crossosoma bigelovii John C. Roos 1949-4-2 4127 Riverside San Bernardino Mtns./Sonoran (Colorado) Desert, Whitewater Canyon Comment
  SEINET9255224 Image available Croton californicus J. C. Roos 1965-6-23 Riverside Palm Springs Comment
  UCR23635  Croton setiger John C. Roos 1946-9-20 3057 San Bernardino Southern Mojave Desert, between Apple Valley and Lucerne Valley 915 Comment
  UCR17542  Crypsis vaginiflora John C. Roos 1952-6-4 5735 Riverside San Jacinto River Valley, San Jacinto river bottomland 1.5 mi SE of Perris 427 Comment
  SD167194  Cryptantha barbigera var. fergusoniae J. C. Roos 1948-4-24 3807 Riverside East San Bernardino Mountains/Sopnoran Desert; Whitewater Wash. 518 Comment
  UCR20340  Cryptantha circumscissa John C. Roos, A. R. Roos 1954-6-11 6126 Inyo Northern Mojave Desert, Panamint Mountains, Mahogany Flats 2500 Comment
  UCR31667  Cryptantha gracilis John C. Roos 1949-6-19 4397 San Bernardino Eastern Mojave Desert, SE base of Clark Mountain 1921 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
  CLARK-A1528-2217  Cryptantha intermedia John C. Roos 1947-3-21 3366 Riverside Reche Canyon Comment
  RSA659685  Cryptantha intermedia J. C. Roos 1947-3-21 3366 Riverside Plateau, Reche Canyon Comment
  CLARK-A1528-2219  Cryptantha jamesii var. abortiva John C. Roos 1937-7-21 San Bernardino Lost Creek 1981 Comment
  CLARK-A1528-2223  Cryptantha micrantha John C. Roos 1949-4-11 4239 Riverside Chuckwalla Mountains Comment
  UCSB46753  Cryptantha micrantha Roos, John 1965-6-26 San Bernardino Upper Santa Ana Basin near Fish Creek, San Bernardino Mtns. Comment
  CLARK-A1528-2226  Cryptantha micrantha John C. Roos 1937-4-7 1344 San Bernardino Lytle Creek Comment
  RSA450247  Cryptantha micrantha var. lepida J. C. Roos 1965-6-26 s.n. San Bernardino Upper Santa Ana Basin, near Fish Creek. San Bernardino Mtns. Comment
  RSA0038354  Cryptantha micrantha var. lepida J. C. Roos 1965-7-18 S.N. San Bernardino Bear Valley, San Bernardino Mtns. Comment
  UCR25967  Cryptantha muricata John C. Roos 1948-6-13 3879 San Bernardino San Gabriel Mtns., Lytle Creek, along roadside 1220 Comment
  UCR23583  Cryptantha racemosa John C. Roos 1955-4-6 6289 Inyo Northern Mojave Desert, Saline Valley, mouth of Craig Canyon, E base of Inyo Mtns. 534 Comment
  GH96078  Cryptantha roosiorum J. C. Roos & A. R. Roos 1953-8-13 6015 Unknown Crest of Inyo Mts., 3 mi east of Badger Flat, 10600 ft Comment
  CLARK-A1528-2237  Cryptantha utahensis John C. Roos 1947-4-18 3474 Inyo Death Valley National Park 1737 Comment
  CLARK-A1528-2239  Cryptantha virginensis John C. Roos 1954-6-12 6137 Inyo Panamint Mountains Comment
  CLARK-A1528-3574  Cryptogramma crispa subsp. acrostichoides John C. Roos 1946-9-15 3040 San Bernardino San Bernardino Mountains 3002 Comment
  UCR25935  Cucurbita palmata John C. Roos 1951-9-29 5304 San Bernardino San Bernardino Valley, Loma Linda 335 Comment
  CAS-BOT-BC130883  Cuniculotinus gramineus J. C. Roos; A. R. Roos 1953-8-9 5945 Inyo Tamarack Canyon, Inyo Mts. 2743 Comment
  UCR23367  Cupressus macnabiana John C. Roos 1938-11-19 323 Napa North Coast Range, Pope Valley, Aetna Springs 305 Comment
  CLARK-A1528-2662  Cupressus stephensonii John C. Roos 1962-5-19 Riverside Loma Linda Comment
  POM264466  Cuscuta californica J. C. Roos 1937-9-2 644 Los Angeles Manhattan Beach. Comment
  UCR18959  Cuscuta indecora John C. Roos 1965-9-18 s.n. Inyo Eastern Sierra Nevada Mtns/Owens Valley, Big Pine Comment
  RSA155756  Cuscuta indecora J. C. Roos, A. R. Roos 1955-8-28 6563 Inyo On the West side of Owens Lake, 3 miles North of Olancha 1091 Comment
  SD52914  Cuscuta indecora var. indecora J. C. Roos, A. R. Roos 1955-8-28 6563 Inyo West side Owens Lake 3 miles north of Olancha 1091 Comment
  CLARK-A1528-2578  Cycloloma atriplicifolium John C. Roos 1951-9-25 5300 Riverside Santa Ana River 259 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
  CLARK-A1528-2577  Cycloloma atriplicifolium John C. Roos 1937-9-29 Los Angeles El Monte Comment
  RSA662434  Cycloloma atriplicifolium J. C. Roos 1965-9-26 s.n. Riverside In Indio. Comment
  LA210531  Cymopterus aboriginum John C. Roos; Lucille Roos 1954-5-8 6100 Inyo crest of Grapevine Mts, above Leadfield 1584 Comment
  LA25949  Cymopterus cinerarius John C. Roos; Lucille Roos 1952-7-27 5831 Inyo WHITE MOUNTAINS, ridge at SE rim Reed Flat. 3169 Comment
  CLARK-A1528-4576  Cynodon dactylon John C. Roos 1942-9-5 1717 Los Angeles Los Angeles Comment
  CLARK-A1528-51  Cynodon dactylon John C. Roos 1951-10-2 5311 San Bernardino Loma Linda 320 Comment
  UCR23578  Cynoglossum occidentale John C. Roos 1942-7-1 1253 Mariposa Sierra Nevada Mtns, Yosemite National Park, south slope of Cloud's Rest 2591 Comment
  CLARK-A1528-1490  Cystopteris fragilis John C. Roos, Lucille Roos 1952-7-30 5871 Mono White Mountains 3047 Comment
  CLARK-A1528-2764  Dalea arborescens John C. Roos 1947-4-18 3444 San Bernardino Barstow Comment
  CLARK-A1528-2777  Dalea californica John C. Roos 1942-5-1 1150 Riverside Dry Morongo Canyon Comment
  UC1042986  Dalea searlsiae John and Lucille Roos 1954-6-28 6167 Inyo 3 mi. n.e. Andrews Mt.; Inyo Mts. 2316 Comment
  SEINET3407734 Image available Dalea spinosa J. C. Roos 1959-6-11 Imperial Coyote Wells. Comment
  LA102190  Danthonia californica John C. Roos; 1965-8-1 sn Siskiyou Marble Mountains, Middle Sky High Lake Comment
  UCR23607  Datisca glomerata John C. Roos 1937-5-29 826 San Bernardino San Bernardino Mtns, Deep Creek Comment
  RSA0060579  Datura meteloides John C. Roos 1965-6-27 s.n. San Bernardino Loma Linda. 305 Comment
  UCSB49867  Deinandra arida Roos, John 1969-5-10 Kern Red Rock Canyon Comment
  CLARK-A1528-3862  Delphinium parishii subsp. parishii John C. Roos 1948-4-24 3791 Riverside Cabazon Comment
  RSA0029713  Delphinium polycladon J. C. Roos 1937-8-8 1023 Inyo Lone Pine Canyon 2591 Comment
  UCR25459  Deschampsia danthonioides John C. Roos 1967-5-29 s.n. San Bernardino San Bernardino Mtns., Summit Valley 976 Comment
  UCSB45572  Deschampsia danthonioides Roos, John 1967-5-29 San Bernardino Summit Valley Comment
  RSA85463  Deschampsia danthonioides var. gracilis J. C. Roos 1952-4-16 5543 Riverside Edgemont, near Box Springs. 488 Comment
  CLARK-A1528-2308  Descurainia richardsonii subsp. incisa John C. Roos 1947-8-9 3737 San Bernardino San Bernardino Mountains 2285 Comment
  UCR18761  Descurainia sophia John C. Roos 1966-3-27 s.n. San Bernardino San Bernardino Valley, Loma Linda 396 Comment
  RSA662432  Descurainia sophia A. R. Roos 1954-3-4 s.n. Los Angeles 5001 Gaviota, Encino. Comment
  CLARK-A1528-1796  Dicoria canescens John C. Roos 1957-11-30 6659 Riverside Coachella Valley 152 Comment
  UCR23771  Dicoria canescens subsp. clarkiae John C. Roos 1955-5-13 6359 Inyo Northern Mojave Desert, SE end of Eureka Valley 945 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-A1528-1067  Dicoria canescens subsp. clarkiae John C. Roos, Lucille Roos 1954-11-24 6266 Inyo Eureka Valley 929 Comment
  CLARK-A1528-5323  Dicoria canescens subsp. clarkiae John C. Roos, Lucille Roos 1954-11-24 6266 Inyo Eureka Valley 929 Comment
  CLARK-A1528-5470  Dicoria canescens subsp. clarkiae John C. Roos, Lucille Roos 1954-11-24 6266 Inyo Eureka Valley 929 Comment
  CLARK-A1528-5471  Dicoria canescens subsp. clarkiae John C. Roos, Lucille Roos 1954-11-24 6266 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
  RSA662415  Dicoria canescens subsp. clarkiae J. C. Roos, L. Roos 1954-11-24 3050 Inyo SE end of Eureka Valley. 930 Comment
  CAS-BOT-BC299844  Dieteria canescens var. canescens John Roos; Lucille Roos 1951-8-11 5182 Mono Big Prospector Meadow, Whtie Mts. 3200 Comment
  CLARK-A1528-4583  Digitaria ischaemum John C. Roos 1952-9-25 5898 San Bernardino Loma Linda 320 Comment
  CLARK-A1528-4586  Digitaria ischaemum John C. Roos 1949-10-19 4692 Los Angeles San Gabriel 121 Comment
  UCR20451  Digitaria ischaemum John C. Roos 1952-9-25 5898 San Bernardino San Bernardino Valley, Loma Linda Comment
  RSA78220  Digitaria ischaemum J. C. Roos 1952-9-25 5898 San Bernardino Loma Linda, San Bernardino Valley. 320 Comment
  OBI30463  Diplacus bigelovii J. C. Roos 1967-8-6 s.n. Inyo Mazourka Cyn, Inyo Mts Comment
  UCR30861  Dipsacus sativus John C. Roos 1948-8-29 3962 Sonoma North Coast Ranges, Healdsburg Comment
  UCR25707  Dodecatheon clevelandii John C. Roos 1941-1-18 223 Riverside Plateau in Reche Canyon 610 Comment
  CLARK-A1528-2418  Draba breweri John C. Roos 1937-8-8 2199 Inyo Sierra Nevada Comment
  POM262874  Draba cuneifolia var. integrifolia J. C. Roos 1941-3-15 216 San Bernardino Hills near Loma Linda Comment
  CLARK-A1528-2316  Draba douglasii var. crockeri John C. Roos 1951-8-10 5151 Mono White Mountains 4023 Comment
  UCR25977  Draba oligosperma 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
  POM263488  Draba verna J. C. Roos 1939-2-21 299 Napa Near Angwin, Napa Range. Comment
  CLARK-A1528-1491  Dryopteris arguta John C. Roos 1937-3-27 1326 Santa Barbara Los Olivos Comment
  RSA85439  Dryopteris arguta J. C. Roos 1952-4-13 5519 Riverside Box Springs Mts. 518 Comment
  CLARK-A1528-5665  Dudleya cymosa John C. Roos 1937-6-5 1494 San Bernardino San Bernardino Mountains Comment
  POM265682  Dudleya edulis J. C. Roos 1937-6-13 2234 San Diego Imperial Beach. Comment
  POM265726  Dudleya lanceolata J. C. Roos 1937-6-29 1788 Los Angeles Malibu Beach. Comment
  UCSB42175  Dudleya lanceolata Roos, John 1965-6-16 Orange Dana Point Comment
  CLARK-A1528-5664  Dudleya pulverulenta John C. Roos 1937-6-14 1495 San Diego Lemon Grove Comment
  CLARK-A1528-2624  Dudleya saxosa John C. Roos 1937-5-29 1790 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4867  Dudleya saxosa subsp. aloides John C. Roos 1937-6-14 1787 San Diego Descanso Junction Comment
  UCD98830  Dysphania pumilio A. R. Roos 1937-7-14 s.n. San Bernardino Santa Ana River, near Waterman Avenue. Comment
  RSA662541  Dyssodia papposa J. C. Roos, L. Roos 1952-05 5056 -a San Bernardino Loma Linda, corner of Central & Anderson. 335 Comment
  UCR18667  Dyssodia pentachaeta var. belenidium John C. Roos 1948-9-19 4032 San Bernardino Eastern Mojave Desert, N side of Clark Mountain along the powerline road 1067 Comment
  CLARK-A1528-54  Echinochloa colona John C. Roos 1965-9-14 5202 San Bernardino Loma Linda 323 Comment
  UCR23985  Echinochloa colona John C. Roos 1965-7-4 s.n. San Bernardino San Bernardino Valley, Loma Linda 306 Comment
  CLARK-A1528-4598  Echinochloa crus-galli John C. Roos 1965-7-4 San Bernardino Loma Linda 304 Comment
  UCR23984  Echinochloa crus-galli John C. Roos 1965-7-4 s.n. San Bernardino San Bernardino Valley, Loma Linda 306 Comment
  CAS-BOT-BC445611  Echinodorus berteroi J. C. Roos 1965-10-10 s.n. San Diego Edge of Otay Lake. Comment
  CLARK-A1528-1485  Echinodorus berteroi John C. Roos 1965-10-10 San Diego Otay Lake Comment
  UCR24199  Echinodorus berteroi John C. Roos 1965-10-10 s.n. San Diego Bank of Otay Lake 150 Comment
  CLARK-A1528-202  Eclipta alba John C. Roos 1951-9-22 5233 Riverside Riverside 243 Comment
  POM265811  Elatine californica J. C. Roos 1937-7-27 1673 San Bernardino Boulder Bay, Bear Lake, San Bernardino Mts. Comment
  UCR25249  Elatine gracilis John C. Roos 1965-7-17 s.n. San Bernardino San Bernardino Mountains, Dry Lake 2744 Comment
  UCR24046  Eleusine indica John C. Roos 1942-10-1 1735 Los Angeles Los Angeles, North Boyle and Bridge Street Comment
  CLARK-A1528-4602  Elymus cinereus John C. Roos, Lucille Roos 1951-8-12 5185 Inyo White Mountains 3108 Comment
  LA102170  Elymus condensatus John C. Roos; 1963-8-10 sn Riverside Blythe Comment
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Mar 10 2014
  UCR23323  Elymus condensatus John C. Roos 1952-5-16 5671 San Bernardino San Bernardino Valley, 1 mi west of Colton 320 Comment
  CAS-BOT-BC227764  Elymus elymoides J. C. Roos 1965-7-17 s.n. San Bernardino Barton Flats, San Bernardino Mtns. Comment
  CAS-BOT-BC227765  Elymus elymoides J. C. Roos 1965-6-16 s.n. San Bernardino North slope of Cajon Pass Comment
  RSA71788  Elymus elymoides J. C. Roos, L. Roos 1951-8-8 5094 Inyo Head of Wyman Canyon, White Mountains. 3171 Comment
  UCR20624  Elymus elymoides John C. Roos 1947-7-13 2889 Inyo Northern Mojave /Great Basin Desert, Panamint Mtns, Arcane Meadows, between Baldy [=Rogers?] and Telescope Peaks 3018 Comment
  POM265756  Elymus multisetus J. C. Roos 1937-5-28 2048 San Bernardino By roadside; Horsethief Canyon, Off Cajon Pass. Comment
  RSA40582  Elymus multisetus J. C. Roos 1947-7-13 2889 Inyo Near Arcane Meadows, Panamint Mountains. 3018 Comment
  UCR23883  Elymus salinus John C. Roos 1949-5-29 3539 San Bernardino Eastern Mojave Desert, Coloseum Mine, Clark Mountain 1707 Comment
  UCR23868  Elymus trachycaulus John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Moonridge, Bear Valley 2226 Comment
  UCR23986  Elymus triticoides John C. Roos 1965-6-16 s.n. San Bernardino Mojave Desert, Victorville 915 Comment
  UCR26134  Encelia actoni John C. Roos 1947-3-15 3342 Riverside San Jacinto Valley, Valle Vista, east of Hemet 549 Comment
  CLARK-A1528-1807  Encelia californica John C. Roos 1946-10-12 3130 Los Angeles Los Angeles Comment
  CLARK-A1528-1809  Encelia farinosa John C. Roos 1952-4-9 5509 Riverside Riverside 335 Comment
  UCR24089  Endolepis covillei John C. Roos 1969-5-10 s.n. Kern Western Mojave Desert, Red Rock Canyon 793 Comment
  POM265715  Endolepis covillei J. C. Roos 1937-8-3 2161 Inyo Little Lake, Owens Valley. Comment
  RSA92071  Endolepis covillei J. C. Roos, L. Roos 1954-5-6 6074 Inyo Amargosa river bottom 4 mile north of Shoshone. 518 Comment
  UC1023389  Enneapogon desvauxii J. C. Roos 1950-9-3 4970 San Bernardino s side Clark Mt.; Mojave Desert 1828 Comment
  POM263255  Ephedra californica J. C. Roos 1937-3-26 530 San Luis Obispo Near Summit of Cuyama Valley Comment
  CLARK-A1528-2676  Ephedra viridis John C. Roos 1937-4-26 2115 San Bernardino Providence Mountains Comment
  RSA0108147  Ephedra viridis J. C. Roos 1937-6-10 525 San Diego Mountain Spring Comment
  CLARK-A1528-3341  Epilobium adenocaulon var. holosericeum John C. Roos 1937-7-31 967 San Bernardino San Bernardino 304 Comment
  CLARK-A1528-3340  Epilobium angustifolium John C. Roos 1937-7-22 1164 San Bernardino Mount San Gorgonio Comment
  CLARK-A1528-3296  Epilobium brevistylum John C. Roos 1943-7-31 2693 San Bernardino San Bernardino Mountains Comment
  POM265816  Epilobium canum subsp. canum J. C. Roos 1941-10-11 866 Los Angeles Mandeville Canyon, Santa Monica Mountains. Comment
  UCR27665  Epilobium ciliatum John C. Roos, L. Roos 1949-6-26 4499 San Bernardino Eastern Mojave Desert, Kingston Mountains, Horse [Thief] Springs 1451 Comment
  RSA47542  Epilobium hornemannii subsp. hornemannii J. C. Roos 1949-7-4 4539 San Bernardino High Creek. 2744 Comment
  UCR26294  Epilobium lactiflorum John C. Roos 1949-7-4 4539 San Bernardino San Bernardino Mtns., High Creek, just west of San Gorgonio 2744 Comment
  UCSB42120  Epilobium oregonense Roos, John 1965-7-31 San Bernardino South Fork of the Santa Ana River, San Bernardino Mtns 2286 Comment
  UCSB42150  Epilobium torreyi Roos, John 1965-9-15 San Bernardino Victorville Comment
  CLARK-A1528-7851  Epipactis gigantea John C. Roos 1948-5-15 3838 Riverside Eagle Mountains Comment
  UCR19156  Epipactis gigantea John C. Roos 1948-5-15 3838 Riverside Sonoran (Colorado) Desert, Eagle Mtns., Lost Palms Canyon Comment
  SD132541  Equisetum telmateia subsp. braunii John C. Roos 1952-6-25 5794 Riverside Riverside, Fairmount Park, west end 259 Comment
  CAS-BOT-BC204486  Eragrostis cilianensis J. C. Roos 1965-7-7 s.n. Riverside San Jacinto Comment
  UC1023424  Eragrostis cilianensis John C. Roos 1950-9-1 4961 San Bernardino vicinity Coliseum Mine (e Mohave Desert); Mohave Desert, Clark Mts. 1645 Comment
  UCR19368  Eragrostis cilianensis John C. Roos 1951-9-17 5213 San Bernardino San Bernardino Valley, Loma Linda 320 Comment
  UCSB51375  Eragrostis cilianensis Roos, John 1937-11-12 San Bernardino Loma Linda Comment
  RSA450449  Eragrostis cilianensis J. C. Roos 1965-7-7 s.n. Riverside San Jacinto. Comment
  RSA659627  Eragrostis cilianensis J. C. Roos 1937-11-12 s.n. San Bernardino Loam Linda. 305 Comment
  RSA86877  Eragrostis cilianensis J. C. Roos 1950-9-1 4961 San Bernardino Vicinity of Coliseum Mine, Clark Mountains 1646 Comment
  UCSB51397  Eragrostis curvula Roos, John 1965-10-10 San Diego Hwy. 395; 0.1 miles south of the San Diego/Riverside county line Comment
  RSA659624  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
  CAS-BOT-BC213599  Eragrostis mexicana subsp. mexicana J. C. Roos 1965-7-7 s.n. Riverside San Jacinto Comment
  CAS-BOT-BC213601  Eragrostis mexicana subsp. mexicana J. C. Roos 1951-9-19 5221 San Bernardino Irrigated orchard on West Barton Ave. in Loma Linda, at intersection with San Bernardino St. 335 Comment
  IRVC26150  Eragrostis mexicana subsp. mexicana J. C. Roos 1952-5-14 5659 Riverside Riverside, corner of Iowa Avenue and 8th Street southern coastal 305 Comment
  RSA450464  Eragrostis mexicana subsp. virescens J. C. Roos 1965-7-7 s.n. Riverside San Jacinto. On the edge of alfalfa field. Comment
  UCR20585  Eragrostis mexicana subsp. virescens John C. Roos 1954-5-16 6121 San Bernardino San Bernardino Valley, Loma Linda 335 Comment
  UCR23990  Eragrostis mexicana subsp. virescens John C. Roos 1965-7-7 s.n. Riverside San Jacinto Comment
  UCR24026  Eragrostis mexicana subsp. virescens John C. Roos 1938-8-19 2760 San Bernardino San Bernardino Valley, Loma Linda 305 Comment
  UCR24553  Eragrostis mexicana subsp. virescens Alfred R. Roos 1937-8-4 10878 Inyo Lone Pine 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
  OBI45203  Eragrostis pectinacea John C. Roos 1940-9-14 231 a San Bernardino San Bernardino Valley, S of Bryn Mawr Comment
  CAS-BOT-BC284148  Eragrostis pectinacea var. pectinacea J. C. Roos 1965-7-5 s.n. San Bernardino Loma Linda 304 Comment
  UCR32898  Eragrostis pectinacea var. pectinacea Alfred R. Roos 1937-11-25 s.n. San Bernardino San Bernardino Valley/San Bernardino Mtns. Foothills, Highland, east of San Bernardino 457 Comment
  CLARK-A1528-3220  Eremalche exilis John C. Roos 1965-6-16 San Bernardino Adelanto Comment
  CLARK-A1528-3221  Eremalche exilis John C. Roos 1949-3-19 4115 Riverside Indio Comment
  CLARK-A1528-2642  Eremocarpus setiger John C. Roos 1965-7-27 Riverside Elsinore Comment
  RSA0057702  Eremogone congesta var. subcongesta J. C. Roos 1947-7-11 2844 Inyo Mahogany Flats, Panamint Mts. 2499 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
  CLARK-A1528-3489  Eriastrum densifolium subsp. austromontanum John C. Roos 1943-5-23 2660 Riverside Little San Bernardino Mountains Comment
  CLARK-A1528-3804  Eriastrum densifolium subsp. mohavense John C. Roos 1943-5-23 2661 Riverside Little San Bernardino Mountains Comment
  CLARK-A1528-3493  Eriastrum eremicum John C. Roos 1965-6-16 San Bernardino Mojave Desert Comment
  CLARK-A1528-5116  Eriastrum eremicum John C. Roos, Lucille Roos 1947-7-15 2825 Inyo Darwin Mesa 1523 Comment
  HSC78526  Eriastrum eremicum J. C. Roos 1965-6-16 San Bernardino 4 mi. N of Adelanto, Mojave Desert Comment
  RSA0120060  Eriastrum eremicum subsp. eremicum J. C. Roos 1947-7-15 2825 Inyo Darwin Mesa. Comment
  RSA0120388  Eriastrum eremicum subsp. eremicum J. C. Roos s.n. San Bernardino 4 miles north of Adelanto, Mojave Desert. Comment
  CLARK-A1528-5750  Eriastrum sapphirinum subsp. dasyanthum John C. Roos 1937-6-11 651 San Diego Barrett Comment
  UCR19151  Eriastrum sapphirinum subsp. dasyanthum John C. Roos 1952-5-26 5723 Riverside Haas' ranch, Reche Canyon 457 Comment
  RSA0123322  Eriastrum sapphirinum subsp. sapphirinum J. C. Roos 1936-8-15 575 San Bernardino Barton Flats. Comment
  RSA0124788  Eriastrum wilcoxii J. C. Roos, A. R. Roos 1954-6-12 6135 Inyo North face Wild Rose Peak at head of Trail canyon. 2683 Comment
  RSA0124789  Eriastrum wilcoxii J. C. Roos, L. Roos 1954-6-25 6152 Inyo Inyo Mountains: East side Badger Flat. 2652 Comment
  RSA0124799  Eriastrum wilcoxii J. C. Roos, A. R. Roos 1954-6-12 6135 Inyo North face Wild Rose Peak at head of Trail canyon. 2683 Comment
  RSA0125134  Eriastrum wilcoxii J. C. Roos 1947-7-12 2834 Inyo Wildrose canyon, Panamint Mountains. 2378 Comment
  CAS-BOT-BC131496  Ericameria albida John Roos; Lucille Roos 1954-9-14 6235 Inyo Amargosa Desert 2.5 miles NE of Death Valley Junction along Ash Meadows road 624 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
  UC1010277  Ericameria albida John and Lucille Roos 1953-10-31 6034 Inyo 3 mi s of Shoshone (Amargosa River bed); Amargosa River 441 Comment
  UC1043012  Ericameria albida John and Lucille Roos 1954-11-23 6260 Inyo 1.4 mi s of Lower Warm Springs; Saline Valley 381 Comment
  UCSB37810  Ericameria albida Roos, John; Roos, Alfred 1954-7-15 Inyo Lower Warm Spring, Saline Valley Comment
  UCSB45939  Ericameria arborescens Roos, John 1965-10-2 San Bernardino Camp Angelus; San Bernardino Mtns. Comment
  UCR23332  Ericameria cuneata John C. Roos 1949-8-13 4609 San Bernardino Eastern Mojave Desert, Copper Queen Mine, Keystone Canyon, New York Mtns 1829 Comment
  UCR26087  Ericameria cuneata John C. Roos 1948-9-25 4076 San Bernardino San Bernardino Mtns, Arrowhead Highlands 1524 Comment
  RSA45540  Ericameria cuneata var. spathulata J. C. Roos, L. Roos 1948-9-25 4076 San Bernardino Arrowhead Highlands 1524 Comment
  UC1234662  Ericameria discoidea J. C. and A. R. Roos 1955-8-26 6552 Inyo n shoulder Waucoba Mt.; Inyo Mts., Waucoba Mt. 3261 Comment
  UCR19532  Ericameria discoidea John C. Roos 1958-8-31 s.n. Inyo Northern Mojave Desert, 3 mi. east of Badger Flats, Inyo Mtns 3232 Comment
  RSA44909  Ericameria gilmanii J. C. Roos 1947-9-19 2798 Inyo Panamint Mountains; Ridge SE of Telescope Peak. 3354 Comment
  UC1494271  Ericameria gilmanii J. C. Roos 1947-9-19 2798 Inyo rocky ridge se Telescope Peak; Panamint Mtns. 3352 Comment
  UCR23898  Ericameria gilmanii John C. Roos 1956-8-29 6597 Inyo Northern Mojave Desert, Panamint Mountains, head of Death Valley Canyon 2300 Comment
  CAS-BOT-BC292384  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
  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
  GH417203  Ericameria nana J. C. Roos & A. R. Roos 1955-8-24 6538 Unknown Summit ridge of Last Chance Mts., 3.5 miles south of Willow Spring 2438 Comment
  UCR19507  Ericameria nauseosa var. oreophila John C. Roos 1965-9-18 s.n. Inyo Owens Valley, Lone Pine, flats near Owens River bottom 1098 Comment
  POM266282  Ericameria parishii J. C. Roos 1942-11-14 2582 San Bernardino Cedar Springs, N base of San Bernardino Mts. 1037 Comment
  CAS-BOT-BC174359  Ericameria parishii var. parishii J. C. Roos 1965-10-2 s.n. San Bernardino Camp Angelus, San Bernardino Mtns. Comment
  UCR18578  Ericameria parryi var. aspera John C. Roos 1956-9-29 6601 Inyo Northern Mojave Desert, Panamint Mountains, Arcane Meadow 3018 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
  POM266284  Ericameria pinifolia J. C. Roos 1942-10-10 1723 Los Angeles Westwood Village NW of Los Angeles County Comment
  CAS-BOT-BC293320  Ericameria teretifolia John Roos; Lucille Roos 1947-9-20 2811 Inyo Wild Rose [Wildrose] Canyon, Panamint Mts. 1524 Comment
  CLARK-A1528-1813  Erigeron aphanactis John C. Roos 1949-5-28 4332 San Bernardino Clark Mountains Comment
  UCR23766  Erigeron aphanactis John C. Roos 1955-5-15 6380 Inyo Northeastern Mojave Desert, Willow Creek, Last Chance Mtns 1585 Comment
  RSA92166  Erigeron aphanactis var. aphanactis J. C. Roos, L. Roos 1954-6-28 6170 Inyo Loretto Road, above Loretto Mine. 1646 Comment
  RSA71711  Erigeron argentatus J. C. Roos 1952-7-25 5817 Inyo Between Westgaard Pass and Reed Flat, White Mtns. 2439 Comment
  CLARK-A1528-1816  Erigeron breweri John C. Roos 1965-6-26 San Bernardino San Bernardino Mountains Comment
  RSA47464  Erigeron breweri var. bisanctus J. C. Roos 1949-7-16 4560 San Bernardino Moonridge, Bear Valley, San Bernardino Mts. 2256 Comment
  RSA47465  Erigeron breweri var. covillei J. C. Roos, L. Roos 1949-6-23 4467 San Bernardino Near Rock Springs, Mid-hills, New York Mountains. 1463 Comment
  UCR30560  Erigeron breweri var. porphyreticus John C. Roos 1947-6-21 3691 San Bernardino San Bernardino Mtns, Fawnskin, Bear Valley Comment
  UCR26158  Erigeron clokeyi John C. Roos 1947-7-11 2905 Inyo Northern Mojave Desert, Panamint Mtns, Mahogany Flats 2470 Comment
  CLARK-A1528-2169  Erigeron linifolius John C. Roos 1940-9-18 229 a San Bernardino Loma Linda Comment
  CLARK-A1528-1827  Erigeron lonchophyllus John C. Roos 1966-8-6 San Bernardino San Bernardino Mountains 2438 Comment
  CLARK-A1528-1853  Erigeron philadelphicus John C. Roos 1952-5-20 5700 San Bernardino 304 Comment
  CLARK-A1528-1828  Erigeron pumilus John C. Roos 1943-7-4 2719 San Bernardino San Bernardino Mountains 2986 Comment
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Jul 3 2014
  CLARK-A1528-5339  Erigeron strigosus John C. Roos 1957-7-10 6654 San Bernardino Loma Linda Comment
  RSA662545  Erigeron strigosus J. C. Roos 1957-7-10 6654 San Bernardino Loma Linda. Comment
  CLARK-A1528-4620  Eriochloa acuminata John C. Roos 1939-9-16 San Bernardino Highland Comment
  CLARK-A1528-4621  Eriochloa acuminata John C. Roos 1950-9-9 4985 San Bernardino San Bernardino Valley 365 Comment
  CLARK-A1528-4622  Eriochloa acuminata John C. Roos 1937-11-28 Riverside Riverside Comment
  POM251759  Eriochloa acuminata A. R. Roos 1937-11-22 7 Riverside East washington Ave., Riverside. Comment
  POM263192  Eriochloa acuminata J. C. Roos 1937-9-5 438 San Bernardino Patton, San Bernadino Valley. Comment
  LA102172  Eriochloa acuminata var. acuminata Alfred R. Roos; 1937-11-28 sn Riverside E Washington St Comment
  UC1023431  Eriochloa acuminata var. acuminata John C. Roos 1950-9-9 4985 San Bernardino San Bernardino Valley, Loma Linda, San Bernardino St. and Barton Ave. San Bernardino Valley; , Loma Linda 365 Comment
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Jan 28 2015
  UCD65680  Eriochloa aristata J. C. Roos 1965-9-26 Riverside In 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
  UCR26265  Eriochloa contracta John C. Roos 1963-8-10 s.n. Riverside Sonoran (Colorado) Desert, Colorado River Valley, Blythe 82 Comment
  GH355965  Eriochloa gracilis J. C. Roos 1950-8-22 4945 Unknown Highland, San Bernadino Valley Comment
  RSA0036055  Eriochloa gracilis A. R. Roos 1937-11-25 s.n. San Bernardino Highland Comment
  RSA450469  Eriodictyon crassifolium J. C. Roos 1965-6-13 s.n. Riverside Palms to Pines Hwy., San Jacinto Mtns. Comment
  CLARK-A1528-2972  Eriodictyon trichocalyx John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3613  Eriogonum angulosum John C. Roos 1937-4-25 2099 San Bernardino Essex Comment
  CLARK-A1528-3616  Eriogonum angulosum John C. Roos 1937-4-23 1824 Riverside Twentynine Palms Comment
  POM265721  Eriogonum angulosum J. C. Roos 1937-8-10 1813 Kern Bodfish. Comment
  UCR25337  Eriogonum baileyi var. baileyi John C. Roos 1965-10-17 s.n. San Bernardino Mojave Desert, Desert flat at Phelan Rd., south of Victorville Comment
  CAS-BOT-BC254163  Eriogonum baileyi var. baileyi J. C. Roos; A. R. Roos 1954-8-15 6228 Inyo Whipoorwill (or Soldier) Flat at east side of Waucoba Mtn., Inyo Mts. 2194 Comment
  RSA155701  Eriogonum baileyi var. baileyi J. C. Roos, E. C. Jaeger 1955-7-21 6496 Inyo Willow Spring, Last Chance Mountains. 1829 Comment
  SD52994  Eriogonum brachyanthum John C. Roos 1955-7-24 6523 Inyo 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
  CAS-BOT-BC241850  Eriogonum caespitosum John Roos; Lucille Roos 1952-7-27 5827 Inyo West rim Reed Flat, White Mts. 3108 Comment
  RSA158112  Eriogonum cernuum J. C. Roos 1955-7-23 6507 Inyo Soldier Flat at east base Waucoba Mountain, Inyo Mountains. 2195 Comment
  POM265634  Eriogonum cinereum J. C. Roos 1942-9-26 1727 Los Angeles Sea bluffs, Santa Monica. Comment
  RSA449974  Eriogonum crocatum J. C. Roos 1958-5-22 s.n. Ventura Conejo grade summit on N. base of Santa Monica Mtns. Comment
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Jan 16 2016
  UCR24315  Eriogonum crocatum John C. Roos 1958-5-22 s.n. Ventura Western Transverse Range; Santa Monica Mtns., Conejo Grade, north base of the Santa Monica Mtns. Comment
  UCSB42255  Eriogonum crocatum Roos, John 1958-5-22 Ventura Conejo Grade summit on N. base of Santa Monica Mtns. Comment
  POM263091  Eriogonum davidsonii J. C. Roos 1937-7-16 389 San Bernardino San Gabriel Mountains: near Stockton Flats. Comment
  UCR25384  Eriogonum deflexum John C. Roos 1937-8-25 2026 San Bernardino Eastern Mojave Desert, Windmill Station 1128 Comment
  SD52921  Eriogonum deflexum var. baratum John C. Roos 1955-7-24 6519 Inyo Nelson Range near head of Grapevine Canyon 1890 Comment
  CAS-BOT-BC256114  Eriogonum deflexum var. deflexum John Roos; Lucille Roos 1952-6-28 6172 Inyo North base of sand dunes at SE end Eureka Valley 914 Comment
  RSA450254  Eriogonum elongatum J. C. Roos 1965-10-20 s.n. San Bernardino The east fork of Mountain Home Canyon. Comment
  CLARK-A1528-997  Eriogonum fasciculatum subsp. polifolium John C. Roos 1948-5-15 3844 Riverside Eagle Mountains 853 Comment
  RSA0060581  Eriogonum gracile John C. Roos 1952-8-27 5888 Riverside Pigeon Pass, Box Springs Mts. 457 Comment
  RSA393252  Eriogonum gracile var. gracile A. R. Roos 1922-11-12 s.n. San Bernardino S of Loma Linda. Comment
  CAS-BOT-BC251138  Eriogonum gracilipes John Roos; Lucille Roos 1951-8-8 5104 Mono Big Prospector Meadow at head of Crooked Creek, White Mts. 3200 Comment
  CLARK-A1528-4741  Eriogonum heermannii John C. Roos, Lucille Roos 1954-6-28 6171 Inyo Inyo Mountains 1615 Comment
  CLARK-A1528-3653  Eriogonum heermannii subsp. argense John C. Roos, Lucille Roos 1951-8-12 5191 Inyo White Mountains 2194 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
  UC1234836  Eriogonum heermannii var. argense J. C. and A. R. Roos 1955-8-24 6537 Inyo ridge 2 mi s Willow Spring; Last Chance Mts. 2286 Comment
  UCR24263  Eriogonum heermannii var. argense John C. Roos 1946-9-21 3078 San Bernardino San Bernardino Mtns., Cushenbury Spring 1280 Comment
  RSA155751  Eriogonum kearneyi subsp. monoense J. C. Roos 1955-7-20 6476 Inyo 0.1 mile NW of boundary marker # 80, Last Chance Mountains 2 miles east of Willow Spring. 2073 Comment
  CLARK-A1528-3666  Eriogonum maculatum John C. Roos 1958-9-28 Riverside San Jacinto Mountains Comment
  UCR24211  Eriogonum mensicola John C. Roos 1955-7-24 6521 Inyo Northern Mojave Desert, Nelson Range near head of Grapevine Canyon 1890 Comment
  RSA155706  Eriogonum microtheca var. foliosum J. C. Roos 1955-7-21 6491 Inyo Last Chance Mountains 1miles south of Willow Spring 2073 Comment
  RSA79552  Eriogonum microtheca var. lapidicola J. C. Roos 1953-8-11 5985 Inyo East of Badger Flat 2866 Comment
  CLARK-A1528-3670  Eriogonum microthecum John C. Roos 1949-9-2 4646 San Bernardino 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
  UCR26280  Eriogonum mohavense John C. Roos, L. Roos 1952-5-17 5675 San Bernardino Western Mojave Desert, 10 mi west of Adelanto 945 Comment
  CLARK-A1528-3671  Eriogonum nidularium John C. Roos, Lucille Roos 1947-7-15 2824 Inyo Darwin Mesa Comment
  GH364476  Eriogonum nummulare J. C. Roos & E. C. Jaeger 1955-7-22 6503 Unknown Soldier Flat, east base Waucoba Mountain 2194 Comment
  UCR27470  Eriogonum nummulare John C. Roos, A. R. Roos 1954-8-15 6219 Inyo Northern Mojave Desert, Inyo Mtns., Whipoorwill (or Soldier) flat at east side of Waucoba Mtn. 2165 Comment
  CLARK-A1528-3680  Eriogonum ovalifolium subsp. ovalifolium John C. Roos, Lucille Roos 1952-7-31 5877 Inyo White Mountains 2834 Comment
  CLARK-A1528-3681  Eriogonum ovalifolium subsp. ovalifolium John C. Roos, Lucille Roos 1954-6-26 6158 Inyo Inyo Mountains 2621 Comment
  CAS-BOT-BC258752  Eriogonum ovalifolium var. ovalifolium John Roos; Lucille Roos 1952-7-31 5877 Inyo 1 mile south of Reed Flat, White Mts. 2834 Comment
  RSA48883  Eriogonum panamintense J. C. Roos 1949-9-2 4640 San Bernardino North slopes Kingston Mts 2073 Comment
  CAS-BOT-BC266930  Eriogonum panamintense var. mensicola J. C. Roos 1955-7-24 6521 Inyo Nelson Range near head of Grapevine Canyon 1889 Comment
  CLARK-A1528-5182  Eriogonum parishii John C. Roos 1946-8-27 2921 Riverside Santa Rosa Mountains 2194 Comment
  RSA659188  Eriogonum parishii J. C. Roos 1965-10-2 s.n. San Bernardino Camp Angelus, San Bernardino Mtns. Comment
  UCR24310  Eriogonum parishii John C. Roos 1941-9-26 1073 San Bernardino San Bernardino Mtns., Bear Creek near Clarks Ranch Comment
  CLARK-A1528-5181  Eriogonum plumatella John C. Roos 1965-7-21 San Bernardino Victorville Comment
  UCR19263  Eriogonum plumatella John C. Roos 1965-7-21 s.n. San Bernardino Mojave Desert, Victorville Comment
  CLARK-A1528-3695  Eriogonum pusillum John C. Roos 1943-5-23 2667 Riverside Little San Bernardino Mountains 914 Comment
  CLARK-A1528-5180  Eriogonum pusillum John C. Roos 1937-7-14 1817 San Bernardino San Bernardino Comment
  UCR27664  Eriogonum reniforme John C. Roos 1947-4-19 3490 Inyo Death Valley: dry roadside - wash SE of Furnace Creek 732 Comment
  UCR26229  Eriogonum rixfordii John C. Roos 1947-1-26 3200 Inyo Emigrant Canyon below Emigrant Spring, Death Valley 1150 Comment
  UCR24314  Eriogonum roseum John C. Roos 1937-8-10 1045 Kern Southern Sierra Nevada Foothills, north of Caliente in the hills Comment
  RSA71773  Eriogonum rupinum J. C. Roos, L. Roos 1951-8-8 5119 Inyo Locally common on rocky west slope with Arenaria aculeata, Holodiscus dumosus, etc., ridge 1 mi. south of Reed Flat, White Mts. 2957 Comment
  RSA79541  Eriogonum rupinum J. C. Roos, A. R. Roos 1953-8-11 5992 Inyo 2.5 miles east of Blue Bell Mine, Inyo Mts. 2866 Comment
  CLARK-A1528-3706  Eriogonum saxatile John C. Roos 1937-7-17 San Bernardino Comment
  GH364480  Eriogonum shockleyi J. C. Roos 1955-7-21 6484 Unknown Whitetop Peak, summit Last Chance Mountains 2560 Comment
  RSA45492  Eriogonum spergulinum var. reddingianum J. C. Roos, L. Roos 1948-9-7 3989 Mono Crestview. Comment
  CLARK-A1528-3718  Eriogonum umbellatum John C. Roos 1941-8-17 58 Inyo Panamint Mountains 2743 Comment
  POM262943  Eriogonum umbellatum subsp. munzii J. C. Roos 1936-8-15 572 San Bernardino Glen Martin, San Bernardino Mountains. Comment
  CAS-BOT-BC262190  Eriogonum umbellatum var. versicolor John Roos; Lucille Roos 1951-8-9 5126 Inyo Reed Flat, White Mts. 3169 Comment
  RSA157086  Eriogonum umbellatum var. versicolor J. C. Roos 1955-6-19 6432 Inyo One mile SE of Willow Spring, Last Chance Mountains. 1951 Comment
  RSA79482  Eriogonum umbellatum var. versicolor J. C. Roos, A. R. Roos 1953-8-13 6012 Inyo Along crest of Inyo mts. 3 miles east of Badger flat. 3262 Comment
  CAS-BOT-BC262191  Eriogonum umbellatum var. versicolor J. C. Roos; A. R. Roos 1953-8-13 6012 Inyo Crest of Inyo Mts. 3 miles east of Badget Flat 3169 Comment
  CLARK-A1528-3723  Eriogonum wrightii John C. Roos 1967-10-28 Riverside Whitewater 426 Comment
  CAS-BOT-BC264937  Eriogonum wrightii var. subscaposum J. C. Roos; A. R. Roos 1953-8-8 5943 Inyo N.W end Badger Flat, Inyo Mts. 2682 Comment
  UCR26132  Eriophyllum ambiguum John C. Roos, A. R. Roos 1954-6-11 6128 Inyo Northern Mojave Desert, Panamint Mountains, upper Wildrose Canyon near Wildrose Peak 2317 Comment
  CLARK-A1528-1833  Eriophyllum confertiflorum var. tridactylum John C. Roos 1937-5-29 2451 San Bernardino San Bernardino Mountains Comment
  UCR23791  Eriophyllum lanatum var. obovatum John C. Roos 1940-7-17 1889 San Bernardino San Bernardino Mtns, Green Valley 2195 Comment
  UCR26237  Eriophyllum multicaule John C. Roos 1948-5-22 3866 San Bernardino San Bernardino Valley, San Timoteo Canyon, south of Redlands 457 Comment
  POM266312  Eriophyllum wallacei J. C. Roos 1940-5-25 1904 San Bernardino Near mouth of Santa Ana Canyon above Highlands. Comment
  UCR26264  Erodium brachycarpum John C. Roos 1966-3-22 s.n. Riverside Moreno Valley, Edgemont. Comment
  RSA450311  Erythronium californicum J. C. Roos 1938-4-4 1632 Napa Pacific Union College, Angwin. Comment
  UC1234868  Eucrypta micrantha J. C. Roos 1955-6-17 6413 Inyo 2 mi ne Willow Spring; Last Chance Mountains 2011 Comment
  RSA659708  Euonymus occidentalis J. C. Roos 1965-7-3 s.n. Riverside Dark Canyon, San jacinto Mtns. Comment
  CLARK-A1528-2490  Euonymus occidentalis subsp. parishii John C. Roos 1941-8-2 Riverside San Jacinto Mountains 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-A1528-2698  Euphorbia fendleri John C. Roos 1953-8-13 6022 Inyo Inyo Mountains 2499 Comment
  CLARK-A1528-2699  Euphorbia fendleri John C. Roos 1949-5-28 4359 San Bernardino Clark Mountain Range 1828 Comment
  UCR26187  Euphorbia fendleri John C. Roos 1949-5-28 6000 San Bernardino Eastern Mojave Desert, north slope Clark Mountain 1829 Comment
  CLARK-A1528-2700  Euphorbia fendleri John C. Roos 1951-8-12 5193 Inyo White Mountains 2194 Comment
  CLARK-A1528-2701  Euphorbia maculata John C. Roos 1942-9-12 1756 Los Angeles Los Angeles Comment
  RSA659492  Euphorbia maculata J. C. Roos, L. Roos 1951-7-28 s.n. San Bernardino Hwy 99, near Alabama St. west of Redlands, San Bernardino Valley. 366 Comment
  UCR41278  Euphorbia micromera John C. Roos 1948-9-18 4035 San Bernardino Eastern Mojave Desert, near Coloseum Mine, Clark Mountain 1230 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
  OBI33604  Euphorbia polycarpa J. C. Roos 1946-10-26 3145 Riverside Chuckwalla Mts 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-A1528-1309  Eustoma exaltatum John C. Roos 1946-8-26 2977 San Bernardino San Bernardino Comment
  CLARK-A1528-4428  Fagonia laevis John C. Roos 1966-3-26 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-4429  Fagonia laevis John C. Roos 1949-5-5 4095 Riverside Orocopia Mountains Comment
  UCR25380  Fagonia pachyacantha John C. Roos, Lucille Roos 1949-4-6 4146 Riverside Sonoran (Colorado) Desert, Canyon in the Orocopia Mountains, 2.5 mi. NE of Dos Palmas Spring 152 Comment
  CLARK-A1528-7830  Festuca arundinacea John C. Roos 1949-5-21 4317 Riverside Temecula 304 Comment
  CLARK-A1528-7831  Festuca arundinacea John C. Roos 1949-5-21 4317 Riverside Temecula 304 Comment
  CLARK-A1528-4665  Festuca brachyphylla John C. Roos, Lucille Roos 1951-8-10 5149 Mono White Mountains 4266 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
  UCR25371  Festuca californica var. parishii John C. Roos, L. Roos 1951-6-9 5061 San Bernardino San Bernardino Mtns., Fredalba 1768 Comment
  UCR19357  Festuca elatior John C. Roos 1950-5-20 4815 San Bernardino San Bernardino Valley, edge of lawn on Central Street, San Bernardino 305 Comment
  UCSB40902  Festuca microstachys Roos, John 1939-4-18 Napa 3.5 mi N. of Pacific Union College; Angwin; roadside below Dilly's place Comment
  CLARK-A1528-4664  Festuca octoflora John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  UCR31677  Festuca pratensis John C. Roos 1950-7-24 4882 Kern Shafter, along edge of building 122 Comment
  POM263461  Festuca rubra J. C. Roos 1937-7-21 405 San Bernardino Meadows on the south fork of the Sana Ana River. 1982 Comment
  RSA415964  Festuca rubra J. C. Roos, Steve Boyd 1965-7-31 s.n. San Bernardino South Fork Meadows, San Bernardino Mountains. 2287 Comment
  POM263466  Festuca saximontana J. C. Roos 1937-8-8 417 Inyo Lone Pine Canyon. 3049 Comment
  RSA85099  Filago californica J. C. Roos 1952-4-9 5510 Riverside Scattered along dry sunny roadside with Avena barbata, Muhlenbergia microsperma, etc., southeast face Mt. Rubidoux. 335 Comment
  UCR30564  Filago californica John C. Roos 1950-4-26 4760 San Bernardino San Bernardino Valley, Loma Linda hill, Loma Linda 335 Comment
  UCR30565  Filago californica John C. Roos 1950-5-6 4786 Riverside Peninsular Range; Santa Ana Mtns., Head of Hagador Canyon, south of Corona 1037 Comment
  CLARK-A1528-1843  Filago depressa John C. Roos 1952-4-23 5580 Riverside Box Springs Mountain 457 Comment
  CLARK-A1528-3288  Forestiera neomexicana John C. Roos 1937-8-11 22 Los Angeles Lancaster Comment
  CLARK-A1528-5704  Forestiera neomexicana John C. Roos 1946-9-21 3066 San Bernardino Lucerne Valley Comment
  CLARK-A1528-2492  Forsellesia nevadensis John C. Roos 1955-4-11 6321 Inyo 1706 Comment
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Oct 3 2014
  RSA104136  Forsellesia nevadensis J. C. Roos, L. Roos 1955-4-11 6321 Inyo E side of Inyo Mts. near Loretoo Mine Comment
  CLARK-A1528-2929  Frankenia grandifolia John C. Roos 1941-6-16 San Diego Pacific Beach Comment
  UCSB46879  Frankenia palmeri Roos, John 1965-6-30 Riverside Perris Comment
  UCR23700  Frankenia salina John C. Roos 1950-6-24 4843 San Bernardino Mojave Desert, Rabbit Springs 884 Comment
  CLARK-A1528-2953  Frasera albomarginata John C. Roos 1949-6-20 4419 San Bernardino New York Mountains 1676 Comment
  RSA157081  Frasera albomarginata J. C. Roos 1955-6-19 6437 Inyo Last Chance Mountains: 2.5 miles south of Willow Spring 2317 Comment
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Sep 5 2013
  UCR25684  Frasera puberulenta John C. Roos, A. R. Roos 1953-8-9 5955 Inyo Northern Mojave Desert Region, Inyo Mountains, near head of Tamarack Canyon 3049 Comment
  CLARK-A1528-2956  Frasera puberulenta John C. Roos, Lucille Roos 1952-7-26 5824 Inyo White Mountains Comment
  CLARK-A1528-5705  Fraxinus anomala John C. Roos 1948-9-18 San Bernardino Clark Mountain Comment
  UC1234828  Fraxinus anomala J. C. Roos 1955-6-19 6441 Inyo 3 mi s Willow Springs; Last Chance Mountains 2377 Comment
  UCR23796  Galinsoga parviflora John C. Roos 1968-9-7 s.n. San Bernardino San Bernardino Mtns., Lake Arrowhead Village 1524 Comment
  POM263133  Galinsoga parviflora var. parviflora J. C. Roos 1941-2-18 201 San Bernardino Loma Linda, San Bernardino Valley. Comment
  CLARK-A1528-3941  Galium andrewsii John C. Roos 1967-7-30 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1353  Galium angustifolium John C. Roos 1937-7-18 400 San Bernardino San Gabriel Mountains |San Antonio Canyon 1706 Comment
  CLARK-A1528-7883  Galium angustifolium subsp. angustifolium John C. Roos 1948-5-8 3819 Riverside Whitewater Canyon 548 Comment
  UCR25131  Galium hallii John C. Roos 1951-7-30 5074 Los Angeles San Gabriel Mtns., Big Rock Creek, north of Mt. Baden Powell 1982 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
  CAS-BOT-BC217583  Galium hypotrichium subsp. tomentellum J. C. Roos 1965-7-10 s.n. Inyo South slope of Telescope Peak, near peak, Panamint Mountains Comment
  CLARK-A1528-3950  Galium johnstonii John C. Roos 1965-7-17 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3951  Galium matthewsii John C. Roos 1941-8-17 63 Inyo Panamint Mountains 2407 Comment
  RSA47418  Galium munzii J. C. Roos 1949-6-21 4433 San Bernardino New York Mountains, Keystone Canyon 1829 Comment
  UCR30592  Galium parisiense John C. Roos 1950-7-22 4875 Sonoma North Coast Range, 2 miles east of Duncan Mills 61 Comment
  SD123748  Galium parisiense J. C. Roos 1950-7-22 4875 Sonoma Sand bar along stream bed 2 miles east of Duncan Mills 60 Comment
  CLARK-A1528-5725  Galium stellatum John C. Roos 1937-4-24 483 San Bernardino Sheephole Mountains 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
  UCR26213  Galium trifidum John C. Roos 1937-7-19 378 San Bernardino San Bernardino Valley, [2 miles] south of San Bernardino 320 Comment
  CLARK-A1528-2936  Garrya flavescens John C. Roos 1947-3-15 3336 Riverside San Jacinto Mountains 1066 Comment
  RSA450235  Garrya veatchii J. C. Roos 1938-2-6 s.n. San Bernardino Cajon Pass Comment
  CLARK-A1528-3331  Gaura coccinea John C. Roos 1949-5-28 4340 San Bernardino Clark Mountain Comment
  RSA47545  Gaura coccinea J. C. Roos 1949-6-22 4444 San Bernardino Near Barnwell, New York Mountains. Comment
  RSA48857  Gaura sinuata J. C. Roos 1949-10-8 4689 San Bernardino Jurupa Hills at south end Poplar Ave., Fontana. 305 Comment
  NY999424  Gayophytum decipiens J. C. Roos 1953-8-11 5999 Inyo 2½ miles east of Blue Bell Mine, Inyo Mountains 2987 Comment
  RSA155734  Gayophytum ramosissimum J. C. Roos 1955-6-21 6462 Inyo Last Chance Mountains 2miles NE of Willow Spring. 1951 Comment
  UCR25797  Gentiana amarella John C. Roos 1937-8-8 977 Inyo Sierra Nevada Mtns., Lone Pine Canyon below Mt. Whitney 3506 Comment
  CLARK-A1528-5710  Gentiana newberryi John C. Roos 1948-9-7 4006 Mono Comment
  UCR25302  Gentiana tenella John C. Roos 1959-8-23 s.n. Mono White Mtns., Cottonwood Creek 3049 Comment
  CLARK-A1528-2963  Geranium richardsonii John C. Roos 1937-7-21 1183 San Bernardino San Bernardino Mountains Comment
  RSA0094651  Gilia J. C. Roos 1955-6-17 6394 Inyo 2 miles north of Willow Spring, Last Chance Mountains. 2011 Comment
  RSA659510  Gilia angelensis J. C. Roos, L. Roos 1954-4-17 6069 Riverside Pass at summit of Reche Canyon. 732 Comment
  UCR19146  Gilia angelensis John C. Roos, L. Roos 1954-4-10 6064 San Diego Peninsular Range, San Pasqual 152 Comment
  CLARK-A1528-3503  Gilia capitata John C. Roos 1937-6-18 1236 San Diego Palomar Mountains Comment
  UCR26282  Gilia capitata subsp. abrotanifolia John C. Roos, L. Roos 1952-4-27 5585 Riverside San Timoteo Canyon, south of Redlands 427 Comment
  CLARK-A1528-5711  Gilia eremica John C. Roos 1937-5-31 1653 Kern Mojave Comment
  UCR24227  Gilia latiflora subsp. davyi John C. Roos 1949-4-30 4275 San Bernardino Mojave Desert, north of Hesperia, at intersection of Apple Valley Road and the railroad tracks 854 Comment
  UCSB41132  Gilia leptantha subsp. leptantha Roos, John 1961-9-30 San Bernardino San Bernardino Mtns., Cieniega Seca Creek 2346 Comment
  UCD117866  Gilia ochroleuca John Roos; Lucille Roos 1952-5-17 5676 San Bernardino 8 miles west of Adelanto, Mohave desert. 944 Comment
  CAS-BOT-BC401926  Gilia ochroleuca subsp. ochroleuca J. C. Roos 1955-6-17 6411 Inyo 2 miles NE of Willow Spring, Last Chance Mountains 2011 Comment
  RSA155721  Gilia ophthalmoides J. C. Roos 1955-6-17 6393 Inyo 2 miles north of Willow Spring, Last Chance Mountains. 2011 Comment
  UC1234827  Gilia ophthalmoides J. C. Roos 1955-6-19 6438 Inyo 3 mi s Willow Spring (Last Chance Mountains); , s of Willow Spring 2286 Comment
  RSA158118  Gilia ophthalmoides J. C. Roos 1955-7-22 6501 Inyo Crest of Inyo Mountains at jct. of Eureka Valley and Saline Valley roads 2241 Comment
  UC1042973  Gilia ripleyi John and Lucille Roos 1954-5-9 6107 Inyo Emigrant Canyon Panamint Mts, Emigrant Canyon (Panamint Mts.) 1219 Comment
  CLARK-A1528-3517  Gilia splendens subsp. splendens John C. Roos 1937-7-20 2366 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3519  Gilia splendens subsp. splendens John C. Roos 1937-5-31 San Bernardino Cajon Canyon Comment
  CAS-BOT-BC229520  Gilia triodon J. C. Roos 1949-5-28 3541 San Bernardino N slope of Clark Mountain 1584 Comment
  CAS-BOT-BC266539  Githopsis diffusa John Roos; Lucille Roos 1952-5-24 5710 Riverside N of Moreno 502 Comment
  UCR23687  Githopsis diffusa subsp. diffusa John C. Roos 1950-4-22 4750 Riverside Hills NE of the summit of Reche Canyon 823 Comment
  CLARK-A1528-3096  Glechoma hederacea John C. Roos 1954-4-7 6059 San Bernardino Loma Linda Valley 350 Comment
  UC1080632  Glossopetalon spinescens John and Lucille Roos 1955-4-11 6321 Inyo near Loretto Mine (e side of mts.); Inyo Mts. 1706 Comment
  UCR23702  Glossopetalon spinescens John C. Roos, L. Roos 1955-4-11 6321 Inyo Northern Mojave Desert, Inyo Mtns, Loretto Road above Loretto Mine, east side of range 1707 Comment
  UCR25936  Glossopetalon spinescens John C. Roos 1949-6-19 4402 San Bernardino Eastern Mojave Desert, SE foot of Clark Mountain 1951 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
  RSA659628  Glyceria striata J. C. Roos 1965-7-3 s.n. Riverside Dark Canyon, San jacinto Mtns. Comment
  CLARK-A1528-5407  Glycyrrhiza lepidota John C. Roos 1965-6-16 San Bernardino Victorville 914 Comment
  UCR23904  Glycyrrhiza lepidota John C. Roos 1937-5-29 825 San Bernardino San Bernardino Mtns, Deep Creek Comment
  UCR23905  Glycyrrhiza lepidota John C. Roos 1942-6-6 1064 Los Angeles Western Transverse Range, Placerita Canyon near Newhall 610 Comment
  CLARK-A1528-4848  Gnaphalium californicum John C. Roos 1948-6-26 3890 San Bernardino San Bernardino Mountains Comment
  RSA450486  Gnaphalium chilense J. C. Roos 1965-7-18 s.n. San Bernardino Bear Valley, San Bernardino Mtns. Comment
  CLARK-A1528-1856  Gnaphalium microcephalum John C. Roos 1937-8-19 2501 Riverside San Jacinto Mountains Comment
  CLARK-A1528-4906  Gnaphalium microcephalum John C. Roos 1947-9-6 3745 Riverside San Jacinto Mountains Comment
  UCR20326  Gnaphalium palustre John C. Roos 1952-6-8 5742 Riverside canyon 4 mi NW of Moreno 640 Comment
  UCR25554  Gnaphalium stramineum John C. Roos 1941-4-25 158 Riverside Plateau in Reche Canyon Comment
  UCR25852  Grayia spinosa John C. Roos 1949-4-2 4132 Riverside San Bernardino Mtns., Side canyon off Whitewater Canyon Comment
  RSA85146  Guillenia lasiophylla J. C. Roos 1952-4-9 5500 Riverside Mt Rubidoux. 396 Comment
  RSA0040194  Guizotia abyssinica John C. Roos 1955-7-2 6473 San Diego Escondido. 182 Comment
  RSA659722  Gutierrezia bracteata J. C. Roos 1965-9-26 s.n. Riverside Rocky point near Palm Springs Station. Comment
  CAS-BOT-BC304639  Gutierrezia californica J. C. Roos 1965-6-21 s.n. Riverside The hills 2 miles south of Beaumont 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
  UC1234844  Gutierrezia microcephala J. C. and A. R. Roos 1955-8-24 6540 Inyo 1.5 mi ne Willow Springs; Last Chance Mts. 1889 Comment
  UCR23827  Gutierrezia microcephala John C. Roos 1946-9-21 3045 San Bernardino Mojave Desert, Rabbit Springs, Lucerne Valley 887 Comment
  CAS-BOT-BC308507  Gutierrezia sarothrae J. C. Roos; A. R. Roos 1955-8-23 6533 Inyo West base Last Chance Mts. east of Eureka Valley sand dunes 1219 Comment
  CLARK-A1528-1866  Gutierrezia sarothrae John C. Roos 1941-8-17 54 Inyo Panamint Mountains 2804 Comment
  RSA450481  Gutierrezia sarothrae J. C. Roos 1966-8-6 s.n. San Bernardino Upper Fish Creek at Fish Creek Meadows. 2439 Comment
  CLARK-A1528-3383  Habenaria leucostachys John C. Roos 1936-7-30 953 San Bernardino San Bernardino Mountains Comment
  RSA45481  Halimolobos jaegeri J. C. Roos 1948-9-18 4045 San Bernardino Clark Mtn 2134 Comment
  RSA85657  Halimolobos jaegeri J. C. Roos 1950-8-6 4914 San Bernardino Kingston Peak, Kingston Mountains., Eastern Mojave Desert. 2165 Comment
  CLARK-A1528-1870  Haplopappus acradenius John C. Roos 1947-9-18 2791 Los Angeles Comment
  CLARK-A1528-1871  Haplopappus acradenius John C. Roos 1946-9-2 2986 San Bernardino San Timoteo Canyon Comment
  RSA659724  Haplopappus brickellioides J. C. Roos, P. A. Munz 1955-4-8 6306 Inyo Northern Mojave Desert Last Chance Mtns, east of Eureka Valley sand dunes. 1220 Comment
  UCR23803  Haplopappus brickellioides John C. Roos, P. A. Munz 1955-4-8 6306 Inyo Northern Mojave Desert, Last Chance Mtns, east of Eureka Valley sand dunes 1220 Comment
  CLARK-A1528-1880  Haplopappus cuneatus John C. Roos 1948-9-25 4076 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-1881  Haplopappus cuneatus John C. Roos 1942-10-24 2575 Riverside Joshua Tree National Park Comment
  CLARK-A1528-5602  Haplopappus macronema John C. Roos 1959-8-20 Inyo White Mountains 3047 Comment
  CLARK-A1528-2158  Haplopappus parishii John C. Roos 1941-10-4 864 Los Angeles San Gabriel Mountains 1219 Comment
  CLARK-A1528-1907  Haplopappus venetus subsp. furfuraceus John C. Roos 1937-8-31 2507 San Diego Oceanside Comment
  CLARK-A1528-1894  Haplopappus venetus subsp. vernonioides John C. Roos 1951-9-24 5248 San Bernardino Loma Linda Comment
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Aug 20 2014
  CLARK-A1528-1895  Haplopappus venetus subsp. vernonioides John C. Roos 1965-9-21 Riverside March Air Force Base Comment
  GH417917  Hazardia brickellioides J. C. Roos 1955-7-23 6513 Unknown Beveridge Canyon, east base Inyo Mts., Saline Valley 640 Comment
  CLARK-A1528-1933  Hecastocleis shockleyi John C. Roos, Lucille Roos 1954-5-8 6094 Inyo Grapevine Mountains 1645 Comment
  RSA92062  Hecastocleis shockleyi J. C. Roos, L. Roos 1954-5-8 6094 Inyo Crest of Grapevine Mts., Leadfield 1646 Comment
  UCR26291  Hedeoma nana John C. Roos 1950-9-3 4977 San Bernardino Eastern Mojave Desert, canyon on south side Clark Mountain, NW of Mountain Pass 1829 Comment
  HSC78509  Hedypnois cretica A. R. Roos 1954-5-17 Los Angeles Hollywood, near North Kenmore & Oakdale Streets. 91 Comment
  OBI33605  Hedypnois rhagadioloides A. R. Roos 1954-5-17 s.n. Los Angeles Near N Kenmore and Oakdale Sts, Hollywood 91 Comment
  UCSB45578  Helenium bigelovii Roos, John 1965-9-11 San Bernardino Bank of Mill Creek, San Bernardino Mtns. Comment
  UC1495798  Helianthus annuus J. C. Roos 1950-4-7 4728 Inyo at Tecopa Tecopa 426 Comment
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Sep 29 2010
  RSA594031  Helianthus annuus subsp. lenticularis J. C. Roos 1965-10-3 s.n. San Bernardino Loma Linda Comment
  CLARK-A1528-1909  Helianthus bolanderi John C. Roos 1956-8-4 6592 Santa Barbara 1219 Comment
  UCSB37797  Helianthus niveus Roos, John 1965-4-28 Riverside Palm Springs Comment
  UCSB37798  Helianthus niveus Roos, John 1962-4-3 Riverside Palm Springs Airport 121 Comment
  CLARK-A1528-1913  Helianthus niveus subsp. canescens John C. Roos 1965-4-28 Riverside Palm Springs Comment
  UCD132933  Heliomeris multiflora var. nevadensis J. C. Roos 1965-7-11 s.n. Inyo Wildrose Canyon, at kilns. Panamint Mountains. Comment
  CLARK-A1528-1916  Hemizonia arida John C. Roos 1969-5-10 Kern Red Rock Canyon Comment
  UCR23814  Hemizonia arida John C. Roos 1969-5-10 s.n. Kern Western Mojave Desert, Red Rock Canyon 793 Comment
  RSA450490  Hemizonia floribunda J. C. Roos 1965-10-10 s.n. San Diego 8 mi SE of Dulzura. Comment
  RSA659714  Hemizonia kelloggii J. C. Roos 1965-6-27 s.n. Riverside Reche Canyon Comment
  UCR23815  Hemizonia kelloggii John C. Roos 1965-6-27 s.n. Riverside Reche Canyon Comment
  RSA92593  Hemizonia kelloggii J. C. Roos 1952-5-26 5713 Riverside Hass' Ranch. Reche Canyon. 457 Comment
  CLARK-A1528-1927  Hemizonia ramosissima John C. Roos 1965-6-27 San Bernardino Loma Linda Hills 1000+ ft Comment
  CAS-BOT-BC388484  Herniaria hirsuta var. cinerea John C. Roos 1954-6-5 6123 San Bernardino Loma Linda, San Bernardino Valley 320 Comment
  UCR24463  Hesperocnide tenella John C. Roos 1952-4-13 5537 Riverside Riverside, north base of the Box Springs Mtns. 396 Comment
  RSA155689  Hesperostipa comata subsp. comata J. C. Roos 1955-6-19 6453 Inyo Willow Spring, Last Chance Mountains 1829 Comment
  RSA47318  Hesperostipa comata subsp. comata J. C. Roos 1949-6-19 4396 San Bernardino SE base of Clark Mountain Comment
  CLARK-A1528-1023  Heterocodon rariflorum John C. Roos 1937-5-29 San Bernardino San Bernardino Mountains Comment
  RSA0074602  Heterotheca fastigiata J. C. Roos, Lucille Roos 1949-9-17 4657 Riverside Whitewater Wash, 2.2 miles N of Whitewater. 518 Comment
  CLARK-A1528-1928  Heterotheca grandiflora John C. Roos 1951-9-19 5224 San Bernardino Loma Linda 335 Comment
  GH417925  Heterotheca sessiliflora J. C. Roos & L. Roos 1950-8-19 4938 Unknown 4 Comment
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Jul 22 2016
  RSA0075939  Heterotheca sessiliflora J. C. Roos, Lucille Roos 1950-8-19 4938 San Diego Torrey Pines beach. 5 Comment
  UCR18771  Heterotheca sessiliflora subsp. fastigiata John C. Roos 1965-9-26 s.n. Riverside San Jacinto Mtns., Thomas (Garner) Valley Comment
  CAS-BOT-BC310878  Heterotheca sessiliflora subsp. sessiliflora John Roos; Lucille Roos 1950-8-19 4938 San Diego Torrey Pines beach 4 Comment
  UCR23812  Heterotheca subaxillaris John C. Roos 1965-9-26 s.n. Riverside Sonoran (Colorado) Desert, 2 mi south of Jackson St., Indio Comment
  UCSB42205  Heterotheca subaxillaris Roos, John 1965-9-26 Riverside 2 miles south of Jackson St., Indio Comment
  UCD133099  Heterotheca villosa J. C. Roos 1965-9-16 s.n. Riverside on State St. near Florida St, Hemet. Comment
  UCR23297  Heterotheca villosa var. scabra John C. Roos, Lucille Roos 1950-10-21 5011 Riverside Mojave Desert, Little San Bernardino Mountains, Wonderland of Rocks [Joshua Tree National Park] 1220 Comment
  UCR24439  Heuchera hirsutissima John C. Roos 1946-8-27 2784 Riverside Peninsular Range, Santa Rosa Mtns 2287 Comment
  CAS-BOT-BC425019  Heuchera parvifolia John Roos; Lucille Roos 1952-7-30 5874 Mono Crooked Creek, White Mts. 3078 Comment
  CLARK-A1528-4094  Heuchera rubescens John C. Roos, Lucille Roos 1947-7-14 2850 Inyo Panamint Mountains 2651 Comment
  CLARK-A1528-4095  Heuchera rubescens John C. Roos 1941-8-17 49 Inyo Panamint Mountains 3200 Comment
  CAS-BOT-BC424467  Heuchera rubescens John Roos; Lucille Roos 1947-7-13 2883 Inyo Telescope Peak, Panamint Mts. 3291 Comment
  RSA0062965  Heuchera rubescens var. alpicola J. C. Roos 1947-7-14 2850 Inyo North slope Baldy Peak, Panamint Mts. 2652 Comment
  CLARK-A1528-1943  Hieracium albiflorum John C. Roos 1937-7-20 2470 San Bernardino San Bernardino Mountains 1981 Comment
  CLARK-A1528-4678  Hilaria jamesii John C. Roos, Lucille Roos 1954-5-8 6095 Inyo Grapevine Mountains 0 Comment
  UCSB51279  Hilaria rigida Roos, John 1965-9-5 Riverside 18 miles W. of Blythe Comment
  CLARK-A1528-7811  Hoffmannseggia falcaria John C. Roos 1940-8-31 241 Los Angeles Monterey Park Comment
  RSA262779  Hoffmannseggia glauca J. C. Roos 1936-5-3 710 San Diego San Felipe Valley, west edge Colorado Desert. Comment
  CLARK-A1528-1248  Holcus lanatus John C. Roos 1937-8-4 420 Inyo Independence 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
  CAS-BOT-BC320361  Holocarpha virgata J. C. Roos 1965-10-10 s.n. San Diego Otay Lake Comment
  UCSB42192  Holocarpha virgata Roos, John 1965-10-10 San Diego Otay Lake Comment
  CLARK-A1528-1267  Hordeum californicum John C. Roos 1937-7-22 409 San Bernardino San Bernardino Mountains 1828 Comment
  CLARK-A1528-4688  Hordeum californicum John C. Roos 1965-7-18 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
  UCSB45577  Hordeum depressum Roos, John 1952-4-22 San Bernardino Waterman Ave. west of Loma Linda, San Bernardino Valley 304 Comment
  UCR26284  Hordeum intercedens John C. Roos 1952-4-23 5571 Riverside Perris-Aguanga Basin region, 1 mi SE of Perris 427 Comment
  RSA45206  Hordeum jubatum J. C. Roos, L. Roos 1949-5-14 4306 San Bernardino Lucerne Valley 884 Comment
  UCR24056  Hordeum jubatum John C. Roos 1949-5-14 4306 San Bernardino S Mojave Desert, Lucerne Valley 884 Comment
  CLARK-A1528-3997  Horkelia bolanderi John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3999  Horkelia bolanderi subsp. parryi John C. Roos 1937-7-21 Roos No. 2374 San Bernardino San Bernardino Mountains Comment
  POM251758  Horkelia californica subsp. dissita J. C. Roos 1937-7-31 8 San Bernardino Crestline, San Bernardino Mountains. Comment
  CLARK-A1528-3064  Horkelia elata John C. Roos 1943-8-1 2696 San Bernardino San Bernardino County Comment
  RSA71739  Horkelia hispidula J. C. Roos, L. Roos 1952-7-28 5856 Inyo White Mountains; head of Wyman Canyon 3201 Comment
  RSA450257  Horkelia rydbergii J. C. Roos 1965-7-18 s.n. San Bernardino Snow Valley, San Bernardino Mountains. Comment
  UCR23776  Hulsea californica John C. Roos 1937-6-15 2504 San Diego Peninsular Range, Peak above Cuyamaca Lake Comment
  CLARK-A1528-4948  Hulsea heterochroma John C. Roos 1942-6-20 1274 Riverside San Jacinto Mountains Comment
  POM266314  Hulsea heterochroma J. C. Roos 1942-6-20 1274 Riverside Roadside N of Idyllwild. Comment
  CLARK-A1528-1953  Hulsea vestita John C. Roos 1937-7-16 2469 Los Angeles San Gabriel Mountains 2895 Comment
  CLARK-A1528-1956  Hulsea vestita John C. Roos 1965-6-26 San Bernardino San Bernardino Mountains Comment
  RSA89977  Hydrocotyle umbellata J. C. Roos 1950-9-22 4990 San Bernardino Edge of pond, Loma Linda, San Bernardino Valley. 335 Comment
  UCR18635  Hydrocotyle verticillata John C. Roos, A. R. Roos 1950-8-7 4917 Inyo Northern Mojave Desert, China Ranch near Tecopa Pass 427 Comment
  UCR18632  Hymenoclea monogyra John C. Roos 1947-5-11 3608 San Bernardino San Bernardino Valley, Fontana Power Station, N. of Rialto 488 Comment
  UCR23780  Hymenoclea monogyra John C. Roos 1965-10-9 s.n. San Diego Murphy Canyon Comment
  UCR23775  Hymenopappus filifolius John C. Roos 1949-6-21 4426 San Bernardino Eastern Mojave Desert, New York Mtns, Keystone Canyon 1829 Comment
  RSA47459  Hymenopappus filifolius var. eriopodus J. C. Roos 1949-6-24 4481 San Bernardino N side of Clark Mtn. 2134 Comment
  CLARK-A1528-1966  Hymenopappus filifolius var. lugens John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  UCR23774  Hymenopappus filifolius var. lugens John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, east end of Bear Valley Comment
  UCSB45611  Hymenoxys acaulis Roos, John 1948-9-18 San Bernardino Clark Mtn. 1981 Comment
  RSA47471  Hymenoxys acaulis var. arizonica J. C. Roos 1949-5-28 4348 San Bernardino N slope Clark, Mts 1829 Comment
  CLARK-A1528-1970  Hymenoxys cooperi John C. Roos 1949-6-24 4482 San Bernardino Clark Mountain 2103 Comment
  CLARK-A1528-1003  Hymenoxys odorata John C. Roos 1949-4-8 4199 Imperial 60 Comment
  CLARK-A1528-1006  Hymenoxys odorata John C. Roos 1949-4-8 4199 Imperial 60 Comment
  CLARK-A1528-5163  Hymenoxys odorata John C. Roos 1949-4-8 4199 Imperial 60 Comment
  CLARK-A1528-4892  Hypochaeris radicata John C. Roos 1937-6-6 471 San Bernardino Loma Linda Comment
  UCSB46874  Impatiens balfourii Roos, John; Roos, Lucille 1957-6-22 San Bernardino Zanja Creek at Mentone Health Haven, east of Mentone 548 Comment
  CLARK-A1528-4696  Imperata brevifolia John C. Roos 1965-6-23 Riverside Palm Springs Comment
  UCR20456  Imperata brevifolia John C. Roos 1949-9-7 4655 Riverside Sonoran (Colorado) Desert, 1 mi west of Whitewater bridge on Hwy 99 along a canal 396 Comment
  RSA45474  Ipomopsis arizonica J. C. Roos, L. Roos 1948-9-18 4065 San Bernardino Clark Mts., Comment
  RSA34196  Isocoma acradenia J. C. Roos 1947-9-18 2791 Los Angeles Lancaster Comment
  UCR20324  Isocoma acradenia var. acradenia John C. Roos, Lucille Roos 1954-9-15 6242 Inyo Northern Mojave Desert, Shoshone, near airstrip 488 Comment
  RSA444685  Isocoma menziesii var. vernonioides J. C. Roos 1965-9-21 s.n Riverside On the W side of March Air Force Base along 395 Hwy. Comment
  UCR23335  Isoetes John C. Roos 1968-8-27 s.n. Fresno Sierra Nevada Mtns, Dragon Lake 3377 Comment
  UCR23334  Isoetes occidentalis John C. Roos 1965-8-27 s.n. Fresno Sierra Nevada Mountains, Rae Lakes 3201 Comment
  CLARK-A1528-1971  Iva acerosa John C. Roos 1949-9-2 San Bernardino East Mojave Desert Comment
  CLARK-A1528-5228  Iva acerosa John C. Roos 1949-9-3 4651 Inyo Tecopa 457 Comment
  POM263545  Ivesia pygmaea J. C. Roos 1937-8-8 534 Inyo Lone Pine Canyon. 2744 Comment
  UCR23503  Ivesia santolinoides John C. Roos 1942-6-25 1747 Mariposa Sierra Nevada Mtns., Yosemite National Park, top of Half Dome 2683 Comment
  RSA0018958  Ivesia santolinoides Roos 1965-7-18 s.n. San Bernardino Arrowbear. Comment
  RSA40591  Jamesia americana var. californica J. C. Roos 1947-7-14 2848 Inyo Panamint Mountains, north slope of Baldy Peak 2744 Comment
  CAS-BOT-BC47086  Jamesia americana var. rosea John Roos; Lucille Roos 1947-7-14 2848 Inyo N. slope of Baldy Peak, Panamint Mts. 2743 Comment
  RSA659607  Jamesia americana var. rosea J. C. Roos 1956-9-29 6602 Inyo Head of Death Valley Canyon, Panamint Mtns. At the base of limestone cliffs. 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
  CLARK-A1528-5053  Juncus phaeocephalus var. paniculatus John C. Roos 1948-5-15 3837 Riverside Eagle Mountains Comment
  RSA450180  Juniperus californica A. R. Roos 1934-1-22 s.n. Riverside Morongo Canyon. Comment
  RSA648667  Kallstroemia californica J. C. Roos 1963-10-24 s.n. Riverside Hayfields, Colorado Desert. Comment
  SEINET13945561 Image available Kallstroemia californica J. C. Roos 1937-1 357 Riverside Blythe Comment
  RSA52772  Kallstroemia parviflora J. C. Roos, A. R. Roos 1950-8-5 4904 San Bernardino Eastern Mojave Desert Coliseum Mine, Clark Mountain. 1707 Comment
  SEINET13945591 Image available Kallstroemia parviflora A. R. Roos 1950-1 sn San Bernardino N side of Clark Mt., eastern Mojave desert Comment
  UCR23568  Kalmia polifolia John C. Roos 1965-8-8 s.n. Fresno Sierra Nevada Mtns., Kearsarge Lake. Middle Section of Kings Canyon National Park 3354 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
  UCR24498  Keckiella corymbosa John C. Roos 1939-7-16 274 Napa North Coast Range, Palisades, Napa Range near Calistoga 823 Comment
  CAS-BOT-BC238267  Keckiella rothrockii J. C. Roos 1955-7-21 6494 Inyo Last Chance Mountains 1 mile south of Willow Spring 2072 Comment
  CLARK-A1528-4213  Keckiella rothrockii John C. Roos 1937-8-5 1026 Inyo White Mountains Comment
  UC1234822  Keckiella rothrockii J. C. Roos 1955-7-21 6494 Inyo 1 mi s Willow Spring; Last Chance Mountains 2072 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
  UCR19046  Kochia americana John C. Roos 1965-9-18 s.n. Inyo Northern Mojave Desert, Darwin Mesa [=Darwin Plateau] Comment
  POM274198  Kochia californica J. C. Roos 1947-9-18 2790 Los Angeles 2 mi. N of Lancaster. Comment
  RSA71757  Koeleria macrantha J. C. Roos, L. Roos 1951-8-8 5105 Mono Big Prospector Meadow at head of Crooked Creek, White Mountains 3201 Comment
  RSA79719  Koeleria macrantha J. C. Roos, A. R. Roos 1953-8-9 5966 Inyo Ridge southeast of Tamarack Canyon, Inyo Mountains 3232 Comment
  RSA85408  Koeleria macrantha J. C. Roos 1952-4-29 5598 Riverside Reche Canyon 457 Comment
  UCR25372  Koeleria macrantha John C. Roos, A. R. Roos 1954-6-12 6134 Inyo Northern Mojave Desert, Panamint Mountains, Wildrose Peak 2652 Comment
  RSA0104244  Kopsiopsis strobilacea John C. Roos 1937-7-17 375 Los Angeles Near Telegraph Peak, San Gabriel Mts. Comment
  CLARK-A1528-5687  Krameria grayi John C. Roos 1937-4-23 796 Riverside Whitewater Comment
  CLARK-A1528-5688  Krameria grayi John C. Roos 1946-5-15 3856 Riverside Eagle Mountains Comment
  RSA155656  Krascheninnikovia lanata J. C. Roos, A. Roos 1955-8-25 6547 Inyo Little Cowhorn Valley, Inyo Mts. 2188 Comment
  CLARK-A1528-4705  Lamarckia aurea John C. Roos 1947-3-21 3373 Riverside Reche Canyon Comment
  POM301536  Lamium amplexicaule J. C. Roos 1938-3-12 1642 Riverside Orchard, La Sierra. Comment
  CLARK-A1528-3537  Langloisia setosissima John C. Roos 1949-4-6 4148 Riverside Comment
  RSA450244  Lappula occidentalis var. occidentalis J. C. Roos 1967-5-30 s.n. San Bernardino In meadow near Arrastre Creek. 2287 Comment
  RSA92176  Lappula occidentalis var. occidentalis J. C. Roos 1954-6-26 6155 Inyo Mouth of Tamarack Canyon 2683 Comment
  CLARK-A1528-4436  Larrea tridentata John C. Roos 1937-4-18 1354 Riverside Whitewater Comment
  CLARK-A1528-1640  Lasthenia chrysostoma John C. Roos 1952-4-2 5459 Riverside Box Springs 487 Comment
  CLARK-A1528-2148  Lasthenia chrysostoma John C. Roos 1952-4-13 5535 Riverside Box Springs Mountains 396 Comment
  CLARK-A1528-7804  Lasthenia coronaria John C. Roos 1938-4-4 1630 Riverside La Sierra Comment
  RSA92749  Lasthenia gracilis J. C. Roos 1952-5-21 5706 Riverside San Jacinto River bottomland 1.5 miles southeast of Perris 426 Comment
  CLARK-A1528-259  Layia glandulosa John C. Roos 1963-4-5 630405-1 San Bernardino 609 Comment
  CLARK-A1528-1980  Layia platyglossa John C. Roos 1941-5-10 130 Riverside San Jacinto Mountains Comment
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Jan 3 2018
  CLARK-A1528-1981  Layia platyglossa John C. Roos 1940-5-20 905 Riverside Reche Canyon 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
  UCR23630  Ledum glandulosum John C. Roos 1942-7-1 1249 Mariposa Sierra Nevada Mtns, Yosemite National Park, south slope of Cloud's Rest 2591 Comment
  POM264171  Lemna minuta J. C. Roos 1937-7-25 656 San Bernardino Seven Oaks, San Bernardino Mountains. Comment
  RSA449963  Lemna trisulca J. C. Roos 1942-11-28 2587 San Bernardino Deep Creek, San Bernardino Mountains. 914 Comment
  UCR19725  Lepidium chalepense John C. Roos, Lucille Roos 1952-4-19 5914 San Bernardino San Bernardino Valley, Barton Road at Loma Linda 335 Comment
  CLARK-A1528-7862  Lepidium lasiocarpum John C. Roos 1949-4-8 4189 Imperial Chocolate Mountains Comment
  CLARK-A1528-2327  Lepidium perfoliatum John C. Roos 1949-4-30 4259 San Bernardino Lucerne Valley Comment
  CLARK-A1528-2329  Lepidium virginicum John C. Roos 1950-6-24 4838 San Bernardino San Bernardino Mountains 2224 Comment
  CLARK-A1528-5233  Lepidium virginicum John C. Roos 1952-3-19 5405 Riverside Box Springs Mountains 487 Comment
  RSA49009  Lepidium virginicum var. robinsonii J. C. Roos 1950-2-14 4706 Los Angeles Between Rinehart St. and Prospect Park, Los Angeles Comment
  RSA85151  Lepidium virginicum var. robinsonii J. C. Roos 1952-4-9 5475 Riverside Fairmount Park 259 Comment
  GH427611  Lepidospartum latisquamum J. C. Roos & A. R. Roos 1955-8-24 6539 Unknown near Willow Spring, Last Chance Mts. 1828 Comment
  UCR18687  Lepidospartum latisquamum John C. Roos 1950-9-3 4971 (=4408) San Bernardino Eastern Mojave Desert, Clark Mountain, south slope 1890 Comment
  UCR24021  Lepidospartum latisquamum John C. Roos 1968-10-5 s.n. San Bernardino San Bernardino Valley, 1 mi west of Cajon 915 Comment
  UCSB49607  Lepidospartum latisquamum Roos, John 1951-7-30 Los Angeles Swartout Valley between Wrightwood and Big Pines, San Gabriel Mts. 1981 Comment
  CLARK-A1528-4710  Leptochloa fascicularis John C. Roos 1946-9-21 3072 San Bernardino Rabbit Springs 883 Comment
  CLARK-A1528-4711  Leptochloa filiformis John C. Roos 1958-9-28 Riverside Coachella Comment
  POM266613  Leptochloa fusca subsp. uninervia J. C. Roos 1937-7-31 2358 San Bernardino Santa Ana River near San Bernardino. Comment
  CLARK-A1528-1366  Leptodactylon pungens John C. Roos 1943-7-4 2723 San Bernardino San Bernardino Mountains Comment
  RSA450143  Leptosiphon breviculus J. C. Roos 1965-6-26 s.n. San Bernardino Upper Santa Ana Basin, near Fish Creek. San Bernardino Mtns. Comment
  UCSB42140  Leptosiphon breviculus Roos, John 1965-6-26 San Bernardino Upper Santa Ana Basin near Fish Creek, San Bernardino Mtns. Comment
  CAS-BOT-BC227038  Leptosiphon floribundus subsp. floribundus J. C. Roos 1965-6-26 s.n. San Bernardino Barton Flats, San Bernardino Mtns. Comment
  UCR19089  Lesquerella kingii John C. Roos, L. Roos 1952-7-26 5821 Inyo White Mtns, east side of Reed Flat at head of Birch Creek 3049 Comment
  UCSB37775  Lessingia leptoclada Roos, John 1965-8-21 Tulare Kaweah River Canyon, west of Sequoia Natl. Park 609 Comment
  CLARK-A1528-1994  Leucelene ericoides John C. Roos 1949-6-19 4398 San Bernardino Clark Mountain 1889 Comment
  RSA47475  Leucelene ericoides J. C. Roos 1949-6-18 4395 San Bernardino Pmtn Pass, Clark Mtn 1340 Comment
  CLARK-A1528-3825  Lewisia brachycalyx John C. Roos 1939-5-26 715 San Bernardino San Bernardino Mountains 2285 Comment
  CLARK-A1528-3830  Lewisia rediviva subsp. minor John C. Roos 1967-6-30 San Bernardino San Bernardino Mountains Comment
  CAS-BOT-BC283900  Leymus cinereus J. C. Roos; A. R. Roos 1947-7-11 2906 Inyo Wild Rose Canyon, Panamint Mountains 2377 Comment
  RSA72063  Leymus cinereus J. C. Roos, L. Roos 1951-8-12 5185 Inyo Reed Flat, White Mountains. 3110 Comment
  UCR25201  Lilium humboldtii John C. Roos 1949-7-30 4588 San Diego Peninsular Range, Palomar Mtn. near Doane Meadows Comment
  CLARK-A1528-3193  Lilium parryi John C. Roos 1937-7-22 2351 San Bernardino San Bernardino Mountains Comment
  UCR24146  Lilium parryi John C. Roos 1956-7-21 6590 San Bernardino San Bernardino Mtns, Moonridge, Bear Valley 2226 Comment
  CLARK-A1528-3810  Limonium sinuatum John C. Roos 1949-10-1 4670 San Diego Marsh Comment
  UCR19041  Limosella aquatica John C. Roos 1937-7-19 1160 San Bernardino San Bernardino Valley, [2 miles] south of San Bernardino 320 Comment
  UCR24468  Limosella aquatica John C. Roos 1946-10-5 3107 San Bernardino San Bernardino Mtns./Mojave Desert, The Pipes, desert slope on E side of San Bernardino Mtns north of Yucca Valley 1357 Comment
  UC1043022  Linanthus aureus subsp. aureus John and Lucille Roos 1952-5-17 5673 San Bernardino Adelanto Mohave Desert 944 Comment
  UCR27496  Linanthus breviculus John C. Roos 1947-5-3 3654 Los Angeles San Gabriel Mtns, Big Pines 1890 Comment
  RSA85447  Linanthus dianthiflorus subsp. dianthiflorus J. C. Roos 1952-4-13 5529 Riverside Box Springs Mts. 488 Comment
  CLARK-A1528-3477  Linanthus liniflorus John C. Roos 1952-5-26 5712 Riverside Reche Canyon 457 Comment
  CLARK-A1528-3479  Linanthus nuttallii John C. Roos, Lucille Roos 1951-8-8 5093 Inyo White Mountains 3169 Comment
  UCR24239  Linanthus orcuttii subsp. pacificus John C. Roos 1937-6-18 1233 San Diego Peninsular Range, Palomar Mountain Comment
  UCR25359  Linanthus parryae John C. Roos, L. Roos 1952-5-10 5645 San Bernardino Mojave Desert, Adelanto 915 Comment
  RSA40584  Linanthus pungens J. C. Roos 1947-7-13 2891 Inyo Baldy Peak, PanamintMountains Comment
  POM302563  Linanthus pungens subsp. hookeri J. C. Roos 1943-7-4 2723 San Bernardino Greenspot, north base of Sugarloaf Mountains Comment
  POM301527  Linaria dalmatica J. C. Roos 1937-6-19 2392 San Diego Fallbrook. Comment
  UCR20389  Lithophragma affine John C. Roos, L. Roos 1954-4-17 6067 Riverside Canyon [1 mile] SE of [summit of] Reche Canyon 686 Comment
  UCR25552  Lithophragma affine John C. Roos 1941-4-19 168 Riverside Peninsular Range, Loma Linda Hills/Box Springs Mtns.; plateau in Reche Canyon 671 Comment
  POM265665  Lithophragma heterophyllum J. C. Roos 1942-4-18 1083 Los Angeles Santa Anita Canyon, San Gabriel Mts Comment
  CLARK-A1528-4108  Lithophragma tenellum John C. Roos 1941-5-31 91 San Bernardino San Bernardino Mountains 2285 Comment
  CLARK-A1528-5560  Loeflingia squarrosa John C. Roos 1937-7-14 501 San Bernardino Comment
  UCR18962  Loeflingia squarrosa John C. Roos 1952-5-14 5664 Riverside Perris-Aguanga Basin, 2 mi NW of Perris Comment
  CLARK-A1528-1437  Lomatium dissectum John C. Roos 1956-5-26 6580 San Bernardino San Bernardino Mountains Comment
  RSA264304  Lomatium dissectum var. multifidum J. C. Roos 1937-5-9 658 San Bernardino Oak Glen, San Bernardino Mountains. Comment
  UCR26276  Lomatium foeniculaceum John C. Roos, A. R. Roos 1953-8-9 5964 Inyo Inyo Mtns, upper Tamarack Canyon 3110 Comment
  SEINET13944432 Image available Lomatium foeniculaceum J. C. Roos 1958-1 sn Inyo Near Badger Flat, Inyo mtns. Comment
  CAS-BOT-BC211140  Lomatium foeniculaceum subsp. inyoense J. C. Roos; A. R. Roos 1955-8-26 6554 Inyo Summit and north shoulder W ucoba [Waucoba] Mt., Inyo Mts. 3383 Comment
  CAS-BOT-BC211141  Lomatium foeniculaceum subsp. inyoense J. C. Roos; A. R. Roos 1953-8-9 5964 Inyo Upper Tamarack Canyon, Inyo Mts. 3108 Comment
  SEINET4310255 Image available Lomatium foeniculaceum subsp. inyoense J. C. Roos 1958-1 Inyo Near Badger Flat, Inyo Mts., Inyo Co., Calif. Comment
  UC1018151  Lomatium foeniculaceum subsp. inyoense John and Lucille Roos 1954-6-24 6149 Inyo 3 mi E of Badger Flat (crest of Inyo Mountains in headwaters of Marble Canyon watershed) Comment
  SEINET8465397 Image available Lomatium foeniculaceum subsp. inyoense J. C. Roos 1958-7-5 s.n. Inyo Near Badger Flat, Inyo Mtns. Comment
  CLARK-A1528-1439  Lomatium inyoense John C. Roos 1959-8-23 Mono White Mountains Comment
Read comments
May 28 2014
  RSA0076472  Lomatium parryi John C. Roos 1949-6-21 4427 San Bernardino Keystone Canyon, New York Mts. 1889 Comment
  CLARK-A1528-1447  Lomatium utriculatum John C. Roos 1952-2-29 5365 Riverside Reche Canyon 426 Comment
  CLARK-A1528-5070  Lotus crassifolius John C. Roos 1940-5-18 835 San Bernardino San Bernardino Mountains Comment
  UCR23901  Lotus grandiflorus John C. Roos 1947-6-27 3713 San Bernardino San Bernardino Mtns., Glen Martin 1738 Comment
  UCR25854  Lotus grandiflorus John C. Roos 1937-7-20 969 San Bernardino San Bernardino Mtns., Camp Angelus 1829 Comment
  CLARK-A1528-2813  Lotus nevadensis John C. Roos 1965-6-26 San Bernardino San Bernardino Mountains Comment
  UCR23902  Lotus nevadensis John C. Roos 1947-6-27 3714 San Bernardino San Bernardino Mtns., Glen Martin 1738 Comment
  RSA331891  Lotus nuttallianus J. C. Roos 1954-12-18 6268 San Diego Encinitas 5 Comment
  CLARK-A1528-998  Lotus oblongifolius John C. Roos 1937-6-6 2011 San Bernardino San Bernardino 304 Comment
  RSA155738  Lotus oblongifolius J. C. Roos, A. R. Roos 1955-8-28 6566 Inyo On the West side of Owens Lake, 3 miles North of Olancha 1091 Comment
  CLARK-A1528-5009  Lotus purshianus John C. Roos 1937-6-7 2400 Riverside San Jacinto Comment
  RSA662072  Lotus purshianus J. C. Roos 1965-6-16 s.n. Orange Dana Point near Doheney Beach. Comment
  RSA659785  Lotus salsuginosus J. C. Roos, L. Roos 1952-5-19 5694 Riverside On hills north of Moreno. Comment
  UCR25958  Lotus salsuginosus var. salsuginosus John C. Roos, L. Roos 1952-5-19 5694 Riverside One year old burn on hills north of Moreno 518 Comment
  UCR25550  Lotus scoparius var. brevialatus John C. Roos 1941-4-25 163 Riverside Plateau in Reche Canyon Comment
  CLARK-A1528-2808  Lotus strigosus John C. Roos 1954-5-15 6120 Riverside Reche Canyon 731 Comment
  CLARK-A1528-2809  Lotus strigosus John C. Roos 1937-3-24 1339 Riverside Pigeon Pass Comment
  CLARK-A1528-5427  Lotus strigosus John C. Roos 1947-2-22 3280 San Bernardino San Bernardino Mountains Comment
  RSA85587  Lotus strigosus J. C. Roos 1952-4-9 5479 Riverside Fairmount Park 259 Comment
  UCR22191  Lotus wrangelianus John C. Roos 1952-4-9 5478 Riverside Hill by Fairmont Park, Riverside 259 Comment
  CLARK-A1528-666  Ludwigia peploides John C. Roos 1951-9-25 5250 Riverside Riverside 259 Comment
  CLARK-A1528-3304  Ludwigia repens John C. Roos 1965-9-15 San Bernardino Victorville Comment
  CLARK-A1528-3305  Ludwigia repens John C. Roos 1937-8-10 1043 Kern Isabella Comment
  RSA662063  Lunaria annua J. C. Roos 1966-5-14 s.n. San Bernardino Lytle Creek, San Bernardino Mtns, Comment
  RSA0016964  Lupinus albicaulis subsp. wolfianus J. C. Roos 1937-8-10 2522 Kern Valley 12 miles north of Caliente. Comment
  CLARK-A1528-2846  Lupinus alpestris John C. Roos 1954-6-12 6133 Inyo Panamint Mountains 2621 Comment
  UCR20426  Lupinus argenteus var. meionanthus John C. Roos 1947-7-13 2874 Inyo Northern Mojave Desert, Panamint Mtns: Telescope Peak 3293 Comment
  RSA71763  Lupinus argenteus var. tenellus J. C. Roos 1951-8-8 5109 Inyo North rim Reed flat, White Mts 3171 Comment
Read comments
Aug 22 2011
  CLARK-A1528-2816  Lupinus arizonicus John C. Roos 1947-2-15 3268 Riverside Eagle Mountains Comment
  RSA450315  Lupinus bicolor J. C. Roos 1966-3-22 s.n. Riverside Edgemont. Comment
  CAS-BOT-BC196829  Lupinus breweri var. grandiflorus J. C. Roos 1965-7-18 s.n. San Bernardino Bear Valley, San Bernardino Mtns. Comment
  POM263079  Lupinus concinnus subsp. orcuttii J. C. Roos 1937-4-23 685 San Bernardino 29 Palms, Mojave Desert Comment
  UCR23949  Lupinus concinnus subsp. orcuttii John C. Roos 1955-3-28 6281 San Diego Hills 10 mi. north of Escondido, Moosa Canyon near the dam, along Hwy 395 152 Comment
  CLARK-A1528-2827  Lupinus densiflorus subsp. lacteus John C. Roos 1937-4-17 1352 Riverside San Timoteo Canyon Comment
  CLARK-A1528-2829  Lupinus excubitus John C. Roos 1941-8-17 61 Inyo Panamint Mountains 2651 Comment
  UCSB42216  Lupinus excubitus Roos, J. 1965-7-18 San Bernardino Along Bear Valley; San Bernardino Mtns. Comment
  CAS-BOT-BC216704  Lupinus excubitus var. excubitus J. C. Roos; A. C. Sanders 1965-7-18 s.n. San Bernardino Along Bear Valley, 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
  CLARK-A1528-2836  Lupinus formosus John C. Roos 1937-5-28 1704 San Bernardino San Bernardino Mountains Comment
  CAS-BOT-BC202054  Lupinus holmgrenianus J. C. Roos 1955-6-17 6407 Inyo 2 miles NE of Willow Spring, Last Chance Mountains 2011 Comment
  GH369030  Lupinus holmgrenianus J. C. Roos 1955-5-15 6374 Unknown 2 miles NE of Willow Spring, Last Chance Mts., almost on the Calif-Nevada State line 2042 Comment
  RSA104826  Lupinus holmgrenianus J. C. Roos 1955-5-15 6374 Inyo 2 miles NE of Willow Spring, Last Chance Mountains, almost on the CA/NV state line 2043 Comment
  UCR23975  Lupinus horizontalis var. platypetalus John C. Roos 1969-5-10 s.n. Kern Western Mojave Desert, Red Rock Canyon 793 Comment
  RSA45494  Lupinus lepidus var. sellulus J. C. Roos, L. Roos 1948-9-7 3991 Mono Crestview. Comment
  CLARK-A1528-7810  Lupinus luteolus John C. Roos 1948-8-31 3933 Lake Clear Lake Comment
  CLARK-A1528-5071  Lupinus nanus John C. Roos 1937-4-17 511 San Bernardino Redlands Comment
  UCR23929  Lupinus shockleyi John C. Roos 1955-6-19 6434 Inyo Northern Mojave Desert, 1 mi. south of Willow Spring, Last Chance Mountains 1813 Comment
  RSA78224  Lupinus stiversii J. C. Roos, Lucille Roos, A. R. Roos 1951-5-27 5051 Mariposa Hills about 8 miles east o f Mariposa. 1006 Comment
  CLARK-A1528-2853  Lupinus truncatus John C. Roos 1938-4-4 730 Riverside La Sierra Comment
  RSA450316  Lupinus truncatus J. C. Roos 1948-4-24 3788 Riverside Cabazon. Comment
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Apr 3 2011
  RSA450467  Lupinus truncatus J. C. Roos 1966-4-5 s.n. Riverside Winchester. Comment
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Mar 20 2011
  RSA78233  Lupinus vallicola subsp. vallicola J. C. Roos, Lucille Roos, A. R. Roos 1951-5-27 5052 Mariposa About 8 miles east of Marposa. 1006 Comment
  CLARK-A1528-4348  Lycium brevipes John C. Roos 1949-3-19 4105 Riverside Dos Palmas Spring Comment
  CLARK-A1528-3100  Lycopus americanus John C. Roos 1952-8-6 5883 San Bernardino San Bernardino 304 Comment
  CLARK-A1528-5696  Lycopus americanus John C. Roos 1952-8-6 5883 San Bernardino San Bernardino 304 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
  RSA425029  Machaeranthera carnosa 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
  RSA47474  Machaeranthera gracilis J. C. Roos, L. Roos 1949-6-18 4393 San Bernardino Mountain Pass, Clark Mountains 1524 Comment
  CLARK-A1528-2185  Machaeranthera tephrodes John C. Roos 1949-4-9 4215 San Bernardino Colorado River Comment
  CLARK-A1528-2003  Machaeranthera tortifolia John C. Roos 1949-4-10 4225 Riverside Chuckwalla Mountains Comment
  UCR25294  Madia exigua John C. Roos 1957-7-2 6649 Sonoma Miller Ridge Comment
  RSA47305  Mahonia haematocarpa L. Roos, John Roos 1949-6-22 4437 San Bernardino Lecyr Well, New York Mts., in a sandy wash. 1524 Comment
  POM263063  Malacothamnus davidsonii J. C. Roos 1937-7-7 331 Los Angeles Near San Fernando Comment
  RSA78379  Malacothamnus fremontii J. C. Roos 1951-7-30 5072 Los Angeles Big Rock Creek, San Gabriel Mts. 1677 Comment
  CLARK-A1528-3234  Malacothamnus orbiculatus John C. Roos 1948-6-21 3688 San Bernardino San Bernardino Mountains Comment
  CAS-BOT-BC345425  Malacothrix clevelandii John Roos; Lucille Roos 1954-5-15 6119 Riverside Summit of 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
  UC1042990  Malosma laurina John and Lucille Roos 1954-7-10 6191 Riverside n. side Pigeon Pass; Box Springs Mts. 487 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
  UCSB45543  Malva parviflora Roos, John; Roos, Lucille 1951-5-5 Riverside Fairmont Park, Riverside Comment
  POM265801  Malvella leprosa J. C. Roos 1942-9-5 1744 Los Angeles Westwood Village Comment
  CLARK-A1528-2789  Marah fabacea John C. Roos 1950-7-19 4858 San Francisco San Francisco 60 Comment
  UCSB42176  Marah macrocarpa Roos, John 1966-4-23 Riverside Santa Ana Mtns., S of Corona 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
  CLARK-A1528-5367  Marsilea vestita John C. Roos 1965-6-30 Riverside Perris Comment
  CLARK-A1528-3414  Meconella denticulata John C. Roos 1942-5-23 1069 Los Angeles San Gabriel Mountains 0 Comment
  CLARK-A1528-2856  Medicago lupulina John C. Roos 1952-4-30 5604 Riverside March Air Force Base 487 Comment
  POM266488  Melica aristata J. C. Roos 1942-7-1 1255 Mariposa Between Clouds Rest and Half Dome, Yosemite National Park. 2287 Comment
  UC1023419  Melica aristata John C. Roos 1950-8-12 4936 San Bernardino Vivian Creek; San Bernardino Mts. 2225 Comment
  UCR24033  Melica aristata John C. Roos 1942-7-1 1255 Mariposa Sierra Nevada Mtns., Yosemite National Park, between Cloud's Rest and Half Dome 2287 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
  UCR30549  Melica californica John C. Roos 1939-5-14 269 Napa North Coast Range, Pacific Union College, Angwin 549 Comment
  CLARK-A1528-4724  Melica frutescens John C. Roos 1952-4-9 5492 Riverside Riverside 396 Comment
  CLARK-A1528-4730  Melica imperfecta John C. Roos 1939-5-27 Riverside Reche Canyon Comment
  LA102164  Melica imperfecta John C. Roos; 1947-2-22 3285 San Bernardino San Bernardino Mountains, Deep Creek, N side of the mountains Comment
  RSA659631  Melica imperfecta J. C. Roos 1950-4-4 4754 Riverside The summit of Reche Canyon. On 2 year old burn, steep West slope, 0.5 mi. N.E. of the summit. 793 Comment
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Apr 3 2011
  CAS-BOT-BC281056  Melica stricta John Roos; Lucille Roos 1954-6-25 6154 Inyo N end Badger Flat, Inyo Mts 2682 Comment
  CLARK-A1528-4731  Melica stricta John C. Roos 1942-7-1 1256 Mariposa Yosemite National Park Comment
  RSA450060  Melica stricta J. C. Roos 1963-6-15 s.n. San Bernardino Between Fish Creek and Heart Bar Creek 2195 Comment
  UCR23996  Melica stricta John C. Roos 1950-6-17 s.n. San Bernardino San Bernardino Mtns., north slope of Butler Peak 2134 Comment
  RSA92082  Melica stricta J. C. Roos 1954-6-25 6154 Inyo Inyo Mountains; Badger Flat Comment
  RSA45542  Menodora scoparia J. C. Roos 1948-9-18 4068 San Bernardino N slopes Clark Mts, S og Green s Mine 1677 Comment
  CLARK-A1528-3101  Mentha arvensis John C. Roos 1940-7-21 1851 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-5349  Mentha citrata John C. Roos 1951-9-25 5289 Riverside Riverside Comment
  UCR18812  Mentha spicata John C. Roos 1952-8-6 5881 Riverside San Bernardino Valley, Riverside, W end of Fairmont Park 259 Comment
  RSA301535  Mentha suaveolens J. C. Roos 1937-8-2 2271 San Bernardino irrigation ditch near Bryn Mawr, San Bernardino Valley, southern California Comment
  POM263282  Mentzelia congesta J. C. Roos 1937-5-31 547 Los Angeles Big Pines. Comment
  RSA44926  Mentzelia dispersa J. C. Roos 1947-6-14 3676 San Bernardino Crestline, San Bernardino Mts. 1585 Comment
  CLARK-A1528-3164  Mentzelia gracilenta John C. Roos 1937-3-25 543 Los Angeles Lancaster Comment
  RSA265793  Mentzelia laevicaulis J. C. Roos 1942-9-24 1740 Los Angeles Gravel wash, Monrovia. Comment
  RSA449943  Mentzelia oreophila J. C. Roos 1950-8-4 s.n. San Bernardino North side of Clark Mtn. 1220 Comment
  UCR20352  Mentzelia oreophila John C. Roos, A. R. Roos 1954-6-11 6125 Inyo Northern Mojave Desert, Panamint Mountains, Wildrose Canyon 976 Comment
  RSA0117768  Mentzelia oreophila J. C. Roos, L. Roos 1949-5-29 4373 San Bernardino N of Clark Mts, eastern Mojave Desert. 1220 Comment
  CLARK-A1528-3444  Microsteris gracilis John C. Roos 1966-4-9 San Bernardino San Bernardino Mountains 2057 Comment
  CLARK-A1528-3487  Microsteris gracilis John C. Roos 1967-5-30 San Bernardino San Bernardino Mountains Comment
  RSA449972  Microsteris gracilis subsp. gracilis J. C. Roos 1966-4-9 6750 San Bernardino North shore 2 miles east of Fawnskin, Bear Vally. Comment
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Dec 15 2016
  POM262903  Mimulus aurantiacus var. puniceus J. C. Roos 1941-5-17 123 Riverside About 4 miles SW of March Field. Comment
  CLARK-A1528-4229  Mimulus bigelovii John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-4233  Mimulus bigelovii John C. Roos 1947-2-15 3260 Riverside Hayfield Comment
  UCR27413  Mimulus bigelovii var. cuspidatus John C. Roos 1967-8-6 s.n. Inyo Inyo Mtns., Mazourka Canyon 1386 Comment
  CLARK-A1528-4243  Mimulus floribundus John C. Roos 1937-5-10 2330 Riverside 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-A1528-4253  Mimulus guttatus John C. Roos 1949-6-23 4472 San Bernardino Mojave Desert 1462 Comment
  POM263095  Mimulus johnstonii J. C. Roos 1937-7-16 376 San Bernardino San Gabriel Mountains: near Stockton Flats. Comment
  UCR19051  Mimulus nanus var. mephiticus John C. Roos, L. Roos 1952-7-28 5846 Inyo White Mtns, Wyman Canyon 2683 Comment
  RSA47449  Mimulus parishii J. C. Roos, Lucille Roos 1949-6-23 4471 San Bernardino Near Rock Springs, Mid-hills, New York Mountains. 1463 Comment
  RSA71708  Mimulus parryi J. C. Roos, Roos 1952-7-31 5879 Inyo NW of Cedar Flat, White Mountain 2439 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
  CLARK-A1528-4270  Mimulus puniceus John C. Roos 1941-5-17 123 Riverside March Field Comment
  CLARK-A1528-4271  Mimulus puniceus John C. Roos 1966-4-29 Riverside Lakeview Comment
  CLARK-A1528-4228  Mimulus rubellus John C. Roos 1949-5-29 4377 San Bernardino Clark Mountain 1676 Comment
  RSA47197  Mimulus tilingii J. C. Roos 1949-7-4 4540 San Bernardino Along stream at High Creek. 2744 Comment
  RSA47294  Minuartia rubella J. C. Roos 1949-7-4 4537 San Bernardino San Gorgonio ridge. 3354 Comment
  UCR19109  Mirabilis albida John C. Roos 1937-8-25 11 San Bernardino Eastern Mojave Desert, Mountain Pass, south of Clark Mountain 1524 Comment
  UCR26261  Mirabilis bigelovii John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Panamint Mtns: Wildrose Canyon at and below the Charcoal Kilns 2134 Comment
  CLARK-A1528-3278  Mirabilis californica John C. Roos 1966-4-23 Riverside Comment
  RSA648014  Mirabilis froebelii J. C. Roos 1965-7-11 s.n. Inyo Wildrose Canyon. Panamint Mtns. Comment
  CAS-BOT-BC384085  Mirabilis laevis var. villosa J. C. Roos 1966-3-26 s.n. Riverside 2 miles S.E. of Desert Center Comment
  CLARK-A1528-7850  Mirabilis laevis var. villosa John C. Roos 1949-4-8 4182 Imperial Chocolate Mountains Comment
  RSA45521  Mirabilis laevis var. villosa J. C. Roos, L. Roos 1949-4-8 4182 Imperial Chocolate Mountains, along wash east end of mountains. Comment
  CLARK-A1528-1380  Mollugo verticillata John C. Roos 1939-6-21 920 Los Angeles Pasadena Comment
  POM265641  Mollugo verticillata J. C. Roos 1939-6-22 920 Los Angeles East Walnut and Foothill Extension, Pasadena Comment
  CLARK-A1528-3177  Monardella lanceolata John C. Roos 1940-8-10 1553 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-3144  Monardella linoides John C. Roos 1960-7-4 Mono White Mountains Comment
  CLARK-A1528-3145  Monardella linoides John C. Roos 1956-8-29 6593 Inyo Panamint Mountains Comment
  CLARK-A1528-3179  Monardella macrantha subsp. hallii John C. Roos 1962-6-30 Riverside Santa Ana Mountains 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
  UC2035934  Monardella odoratissima subsp. glauca J. C. and A. R. Roos 1953-8-9 5951 Inyo Tamarack Canyon Inyo Mts. 3078 Comment
  CLARK-A1528-3154  Monardella villosa John C. Roos 1950-7-22 4868 Sonoma Jenner 30 Comment
  UCR19138  Monardella viridis John C. Roos 1948-8-31 3934 Lake North Coast Range, mountains southwest of Lakeport 610 Comment
  CLARK-A1528-2589  Monolepis nuttalliana John C. Roos 1954-3-25 6047 San Bernardino Mojave Desert Comment
  UCR24216  Monolepis nuttalliana John C. Roos 1946-9-21 3081 San Bernardino San Bernardino Mtns, Baldwin Lake Comment
  CLARK-A1528-2588  Monolepis nuttalliana John C. Roos 1938-4-18 1638 San Bernardino Cronise Lake Comment
  UCR19021  Monolepis spathulata John C. Roos 1937-7-23 1986 San Bernardino San Bernardino Mtns., Big Meadows at Heart Bar State Park. 2073 Comment
  CAS-BOT-BC444697  Montia chamissoi John Roos; Lucille Roos 1951-8-10 5133 Mono McAfee Meadow, White Mts. 3657 Comment
  CLARK-A1528-4740  Muhlenbergia andina John C. Roos 1946-9-4 2950 San Bernardino San Bernardino Mountains 2438 Comment
  POM302530  Muhlenbergia andina J. C. Roos 1943-11-6 2746 San Bernardino Upper Mill Creek 2134 Comment
  UCR23994  Muhlenbergia andina John C. Roos 1962-9-29 s.n. San Bernardino San Bernardino Mtns, Mill Creek 2043 Comment
  CLARK-A1528-76  Muhlenbergia asperifolia John C. Roos 1951-9-25 5257 Riverside Riverside 259 Comment
  RSA153098A  Muhlenbergia asperifolia J. C. Roos 1955-7-23 6514 Inyo Beveridge Canyon, E base of Mtns, Saline Valley 640 Comment
  RSA648069  Muhlenbergia asperifolia J. C. Roos 1946-9-14 3002 Riverside Dos Palmas Springs east of Asbestos Mt. 1066 Comment
  RSA69814  Muhlenbergia asperifolia J. C. Roos 1951-9-25 5257 Riverside West end Fairmount Park 259 Comment
  UC1117445  Muhlenbergia asperifolia J. C. Roos 1955-7-23 6514 Inyo along small stream east base Inyo Mountains, Saline Valley, Beveridge Canyon 640 Comment
  CAS-BOT-BC262697  Muhlenbergia californica John C. Roos 1951-7-30 5075 Los Angeles Big Rock Creek, north of Mt. Baden Powell, San Gabriel Mts. 1981 Comment
  CLARK-A1528-4750  Muhlenbergia californica John C. Roos 1946-8-31 2927 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4751  Muhlenbergia filiformis John C. Roos 1939-6-3 721 San Bernardino Santa Ana River Comment
  POM263003  Muhlenbergia filiformis J. C. Roos 1939-6-3 721 San Bernardino South Fork Santa Ana 2043 Comment
  POM265765  Muhlenbergia microsperma J. C. Roos 2081 Orange East of San Juan Capistrano Comment
  CLARK-A1528-4760  Muhlenbergia porteri John C. Roos, Alfred R. Roos 1950-8-4 4889 San Bernardino Clark Mountain 1219 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
  UC1023409  Muhlenbergia porteri J. C. and A. R. Roos 1950-8-4 4889 San Bernardino north slopes of mts. eastern Mojave Desert, Clark Mts. 1219 Comment
  UC1117461  Muhlenbergia porteri J. C. and A. R. Roos 1955-8-23 6534 Inyo e Eureka Valley sand dunes; west base Last Chance Mts. 1219 Comment
  CLARK-A1528-4762  Muhlenbergia richardsonis Alfred R. Roos 1937-8-19 10679 Riverside San Jacinto Mountains Comment
  UCR20479  Muhlenbergia richardsonis John C. Roos 1950-8-12 4934 San Bernardino San Bernardino Mtns., Vivian Creek 2195 Comment
  UCR26143  Myosurus apetalus John C. Roos 1959-5-16 s.n. San Bernardino San Bernardino Mtns., Holcomb Valley Camp 2256 Comment
  UCR20438  Myosurus minimus subsp. apus John C. Roos 1952-4-9 5515 Riverside Rolling flats at Edgemont, near Box Springs 488 Comment
  CLARK-A1528-2980  Nama demissa John C. Roos 1947-3-15 3355 Riverside Santa Rosa Mountains 365 Comment
  CLARK-A1528-2981  Nama hispida John C. Roos 1949-4-9 4221 San Bernardino Vidal 15' quadrangle Comment
  UCR26301  Nama hispida John C. Roos, Lucille Roos 1949-4-9 4221 San Bernardino Mojave / Sonoran (Colorado) Desert, east of the road junction [Vidal Junction], 6 mi. north of Vidal 284 Comment
  UCR26302  Nama hispida John C. Roos 1949-4-8 4197 Imperial Sonoran (Colorado) Desert, Milpitas Wash. Comment
  CLARK-A1528-2982  Nama rothrockii John C. Roos 1937-7-28 San Bernardino San Bernardino Mountains Comment
  POM263110  Nassella cernua J. C. Roos 1937-5-10 430 Riverside Perris Comment
  CLARK-A1528-3445  Navarretia atractyloides John C. Roos 1948-6-13 3878 San Bernardino Fontana Comment
  UCR30590  Navarretia heterodoxa John C. Roos 1950-7-22 4877 Sonoma North Coast Range, 2 miles east of Duncan Mills 61 Comment
  UCR30586  Navarretia intertexta John C. Roos 1950-7-22 4876 Sonoma North Coast Range, 2 miles east of Duncan Mills 61 Comment
  UCR30591  Navarretia squarrosa John C. Roos 1950-7-22 4878 Sonoma North Coast Range, 2 miles east of Duncan Mills 61 Comment
  POM251785  Nemacladus californicus J. C. Roos 1937-5-25 21 San Bernardino Kramer Junction Comment
  OBI33602  Nemacladus glanduliferus J. C. Roos 1948-5-15 3851 Riverside Upper Lost Palms Cyn, Eagle Mts, Colorado Desert Comment
  UCR25988A  Nemacladus glanduliferus John C. Roos 1947-3-15 3354 A Riverside Sonoran (Colorado) Desert, Santa Rosa Mountains, mouth of Deep Canyon at foot of mtns. 366 Comment
  UCSB45605  Nemacladus glanduliferus Roos, Lucille; Roos, John 1952-5-10 San Bernardino Kremer Hills, Mojave Desert 853 Comment
  CLARK-A1528-2372  Nemacladus gracilis John C. Roos 1937-5-30 1976 San Bernardino Comment
  CLARK-A1528-3748  Nemacladus rubescens John C. Roos 1937-4-25 1793 San Bernardino Essex Comment
  CLARK-A1528-3749  Nemacladus rubescens John C. Roos 1937-4-24 1797 San Bernardino San Bernardino Mountains Comment
  UCR25418  Nemacladus rubescens John C. Roos, L. Roos 1952-5-10 5636 San Bernardino Western Mojave Desert, 4 mi. northwest of Adelanto, near Red Raven Mine 823 Comment
  POM264589  Nemophila menziesii var. menziesii J. C. Roos 1939-3-31 309 Napa Angwin. Howell Mtns. Comment
  RSA425014  Nemophila pedunculata J. C. Roos 1950-6-24 4837 San Bernardino Moonridge, Bear Valley, San Bernardino Mtns. 2226 Comment
  CLARK-A1528-3078  Nicolletia occidentalis John C. Roos 1950-10-21 5017 San Bernardino Little San Bernardino Mountains 914 Comment
  CLARK-A1528-5113  Nicotiana glauca John C. Roos 1942-9-20 1746 Los Angeles West Los Angeles Comment
  CAS-BOT-BC110329  Nitrophila mohavensis John Roos; Lucille Roos 1954-9-14 6234 Inyo Amargosa Desert 3 miles northeast of Death Valley Junction along Ash Meadows road. 624 Comment
  CAS-BOT-BC110333  Nitrophila mohavensis J. C. Roos; A. R. Roos 1954-6-13 6140 Inyo Amargosa Desert 3 miles northeast of Death Valley Junction along Ash Meadows road. 624 Comment
  NY324360  Nitrophila mohavensis J. C. Roos 1954-6-13 6140 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
  RSA89525  Nitrophila mohavensis J. C. Roos 1954-9-14 6234 Inyo Amargosa Desert 3 miles NE of Death Valley Junction along Ash Meadows road 625 Comment
  RSA89533  Nitrophila mohavensis J. C. Roos 1954-7-18 6194 Inyo Amargosa Desert 3 miles NE of Death Valley Junction along Ash Meadows road 625 Comment
  SD50073  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
  UCR24312  Nitrophila mohavensis John C. Roos 1954-7-18 6194 Inyo Northern Mojave Desert, Death Valley region, Amargosa Desert 3 mi. NE of Death Valley Junction, along Ash Meadows road 625 Comment
  RSA0002414  Nitrophila mohavensis J. C. Roos, A. Roos 1954-6-13 6140 Inyo Open flats of Amargosa Desert 3 mi. NE of Death Valley Junction along Ash Meadow road. 625 Comment
  CLARK-A1528-1185  Nitrophila occidentalis John C. Roos 1937-8-9 1957 Inyo Little Lake Comment
  CLARK-A1528-4923  Nitrophila occidentalis John C. Roos 1937-5-30 2044 San Bernardino Victorville Comment
  CLARK-A1528-2596  Nitrophila occidentalis John C. Roos 1965-7-11 Inyo Death Valley Junction Comment
  UCR26306  Nolina bigelovii John C. Roos 1948-5-15 3852 Riverside Sonoran (Colorado) Desert, Eagle Mtns., Lost Palms Canyon Comment
  RSA78225  Nolina parryi J. C. Roos, L. Roos 1952-10-18 5904 Riverside Hidden Valley Campground 1220 Comment
  RSA40561  Notholaena californica subsp. leucophylla J. C. Roos 1946-11-23 3160 Los Angeles Placerita canyon, east of Newhall Comment
  CLARK-A1528-3568  Notholaena sinuata var. cochisensis John C. Roos 1949-5-29 3532 San Bernardino Clark Mountain 1462 Comment
  RSA155651  Oenothera avita subsp. avita J. C. Roos 1955-6-17 6395 Inyo 2 miles NE of Willow Springs, Last Chance Mountains. 2012 Comment
  RSA47544  Oenothera avita subsp. avita J. C. Roos, L. Roos 1949-6-22 4450 San Bernardino New York Mountains; Keystone Canyon 1738 Comment
  UC1043029  Oenothera californica subsp. californica John and Lucille Roos 1952-5-9 5625 San Bernardino near Santa Ana River; Colton 274 Comment
  RSA261210  Oenothera cespitosa subsp. crinita J. C. Roos 1941-8-17 24 Inyo Telescope peak, Panamint Mts. 3354 Comment
  RSA40570  Oenothera cespitosa subsp. marginata J. C. Roos 1947-4-5 3427 Riverside North base Santa Rosa Mountains, upper reaches of Deep canyon. Comment
  GH367848  Oenothera deltoides subsp. eurekensis J. C. Roos 1955-5-13 6356 Unknown southeast end Eureka Valley 944 Comment
  UCR23497  Oenothera deltoides subsp. eurekensis John C. Roos 1955-5-13 6356 Inyo Northern Mojave Desert, SE end of Eureka Valley 945 Comment
  CLARK-A1528-3351  Oenothera hookeri John C. Roos 1946-10-5 3106 San Bernardino San Bernardino Mountains 1356 Comment
  CLARK-A1528-2863  Olneya tesota John C. Roos 1965-12-4 Riverside Colorado Desert 365 Comment
  RSA444475  Olneya tesota J. C. Roos 1965-12-4 s.n. Riverside 2 miles SE of Desert Center. 366 Comment
  UCR25259  Oreonana vestita John C. Roos 1946-9-15 3037 San Bernardino San Bernardino Mtns., San Gorgonio ridge 3293 Comment
  UCR19155  Orobanche bulbosa John C. Roos 1937-7-4 1611 Santa Barbara Upper Cuyama Valley, along border of San Luis Obispo County Comment
  UCR25290  Orobanche fasciculata John C. Roos 1967-5-20 s.n. San Bernardino San Bernardino Mtns., Deep Creek Comment
  UCR25313  Orobanche fasciculata John C. Roos 1965-7-10 s.n. Inyo Northern Mojave Desert, Panamint Mountains, Arcane Meadows, near Telescope Peak 3018 Comment
  RSA0081038  Orobanche fasciculata John C. Roos 1947-7-12 2880 Inyo Upper Wildrose Canyon, Panamint Mountains. 2377 Comment
  RSA0087206  Orobanche fasciculata John Roos, Lucille Roos 1952-7-30 5867 Mono Along Crooked Creek, White Mts. 2865 Comment
  RSA0066490  Orobanche parishii John C. Roos 1937-7-4 1611 Santa Barbara Upper Cuyama Valley, near Wagy Ranch. Comment
  RSA0059342  Orobanche vallicola John C. Roos 1937-7-5 1781 Ventura Upper Sespe Creek. 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-A1528-4281  Orthocarpus hispidus John C. Roos 1940-7-16 1848 San Bernardino San Bernardino Mountains Comment
  RSA262974  Orthocarpus purpurascens J. C. Roos 1941-4-19 172 San Bernardino Reche Canyon. Comment
  CLARK-A1528-4773  Oryzopsis bloomeri John C. Roos, Lucille Roos 1951-7-28 5067 San Bernardino Rathbone Creek 2560 Comment
  CLARK-A1528-1449  Osmorhiza brachypoda John C. Roos 1937-5-9 1683 San Bernardino Oak Glen Comment
  CLARK-A1528-3925  Oxalis albicans subsp. pilosa John C. Roos 1937-9-2 520 Los Angeles Redondo Beach Comment
  CLARK-A1528-3397  Oxalis corniculata John C. Roos 1949-11-18 4697 San Bernardino Loma Linda Hills 335 Comment
  RSA77257  Oxyria digyna J. C. Roos, L. Roos 1951-8-10 5150 Mono Flats 1 mile SE of White Mountain Peak, White Mountains. 4024 Comment
  RSA659598  Oxystylis lutea J. C. Roos 1965-7-11 s.n. Inyo Amargosa River at Eagle Mountain, south of Death Valley Junction. 610 Comment
  CLARK-A1528-4869  Oxystylis lutea John C. Roos 1949-6-28 4526 Inyo Tecopa 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
  UC1234681  Oxytheca dendroidea subsp. dendroidea J. C. Roos 1955-7-23 6504 Inyo Soldier Flat, e base of Waucoba Mountain Inyo Mountains, Waucoba Mountain 2194 Comment
  RSA92760  Oxytheca dendroidea subsp. dendroidea J. C. Roos, A. R. Roos 1954-8-15 6227 Inyo Whipoorwill (or Soldier) Flat, east side Waucoba Mtn., Inyo Mountains. 2195 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-A1528-3758  Oxytheca parishii John C. Roos 1965-10-2 San Bernardino San Bernardino Mountains Comment
  CAS-BOT-BC216561  Oxytropis borealis var. australis J. C. Roos; A. R. Roos 1955-8-26 6557 Inyo Summit Waucoba Mountain, Inyo Mountains 3383 Comment
  UC1234664  Oxytropis borealis var. australis J. C. and A. R. Roos 1955-8-26 6557 Inyo summit Waucoba Mt.; Inyo Mtns. 3383 Comment
  RSA47472  Packera multilobata J. C. Roos 1949-5-28 4350 San Bernardino north side Clark Mtn. 1890 Comment
  UC1494276  Packera multilobata J. C. Roos 1949-6-24 4487 San Bernardino summit Clark Mountain (eastern Mojave Desert); , summit of Clark Mtn. 2407 Comment
  CLARK-A1528-1258  Panicum capillare John C. Roos 1951-9-25 5255 Riverside Riverside 259 Comment
  CLARK-A1528-4783  Panicum capillare John C. Roos 1937-7-19 377 San Bernardino Santa Ana River Comment
  UCR25460  Panicum capillare John C. Roos 1963-8-18 s.n. San Bernardino San Bernardino Valley, Residential garden in Loma Linda 335 Comment
  CLARK-A1528-80  Panicum capillare var. occidentale John C. Roos 1951-9-25 5255 Riverside Riverside 259 Comment
  CLARK-A1528-4392  Parietaria floridana John C. Roos 1959-3-19 5401 Riverside Box Springs Mountains 396 Comment
  CLARK-A1528-82  Paspalum dilatatum John C. Roos 1951-9-20 5231 San Bernardino Loma Linda 335 Comment
  POM301692  Paspalum dilatatum J. C. Roos 1942-6-20 990 Orange Anaheim, Telegraph Road, east of Los Angeles Comment
  RSA648017  Paspalum dilatatum J. C. Roos 1936-10-13 1533 Orange Costa Mesa near Santa Ana. Comment
  RSA69815  Paspalum dilatatum J. C. Roos 1951-9-25 5262 Riverside West end Fairmount Park 259 Comment
  CLARK-A1528-2019  Pectis papposa John C. Roos 1937-8-22 1212 Riverside Comment
  CLARK-A1528-2247  Pectocarya heterocarpa John C. Roos 1966-3-20 Riverside Comment
  CLARK-A1528-2249  Pectocarya linearis John C. Roos 1952-2-29 5371 Riverside Reche Canyon 457 Comment
  UCR18795  Pectocarya linearis John C. Roos 1948-4-10 3785 San Bernardino San Bernardino Valley, SW of Loma Linda Comment
  CLARK-A1528-1238  Pedicularis densiflora John C. Roos 1957-3-15 6609 Ventura Newbury Park Comment
  NY802603  Pediomelum castoreum J. C. Roos 1952-5-10 5642 San Bernardino 4 miles northwest of Adelanto, near Red Haven Mine 823 Comment
  UCR23343  Pellaea mucronata John C. Roos 1947-3-8 3310 San Bernardino San Bernardino Mountains, Deep Creek 1159 Comment
  RSA85120  Pellaea mucronata var. mucronata J. C. Roos 1952-5-7 5616 Riverside Box Springs Mountains, north of Canyon Crest Heights 457 Comment
  CLARK-A1528-4294  Penstemon bridgesii John C. Roos 1952-7-28 5848 Inyo White Mountains 2743 Comment
  CLARK-A1528-4295  Penstemon bridgesii John C. Roos 1941-8-17 65 Inyo Panamint Mountains 2377 Comment
  UCR24457  Penstemon caesius John C. Roos 1965-7-17 s.n. San Bernardino San Bernardino Mountains, South Fork [of the Santa Ana River] near Barton Flats 2439 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
  RSA92432  Penstemon calcareus J. C. Roos 1954-5-8 6102 Inyo Titus Canyon, Grapevine Mountains 1311 Comment
  UCR24493  Penstemon eatonii John C. Roos 1937-7-28 1945 San Bernardino San Bernardino Mtns, Van Deusen Canyon [Caribou Creek], near Bear Valley 2195 Comment
  CAS-BOT-BC265428  Penstemon floridus John Roos; Lucille Roos 1951-8-7 5084 Inyo W side of Westgard Pass, White Mountains 2133 Comment
  RSA92171  Penstemon floridus var. austinii J. C. Roos, L. Roos 1954-6-26 6163 Inyo Inyo Mountains, Mazourka Canyon. 2439 Comment
  NY593823  Penstemon floridus var. austinii J. C. Roos 1954-6-26 6163 Inyo Upper Mazourka Canyon, Inyo Mountains. 2438.4 Comment
  CLARK-A1528-4303  Penstemon grinnellii John C. Roos 1965-7-17 San Bernardino San Bernardino Mountains Comment
  UCR19056  Penstemon grinnellii John C. Roos 1965-7-17 s.n. San Bernardino San Bernardino Mtns, Kilpecker Creek Comment
  POM263245  Penstemon heterophyllus J. C. Roos 1937-6-15 631 San Diego Near Cuyamaca Lake, Cuyamaca Mountains. Comment
  CLARK-A1528-1218  Penstemon heterophyllus subsp. australis John C. Roos 1937-6-2 1988 San Bernardino Yucaipa Comment
  CLARK-A1528-5741  Penstemon incertus John C. Roos 1947-8-2 3734 San Bernardino Burns Canyon 1280 Comment
  RSA45218  Penstemon incertus J. C. Roos, L. Roos 1949-5-14 4299 San Bernardino 5 miles west of The Windmill; Burns-Pipes Wash, east end San Bernardino Mts. 1220 Comment
  RSA659604  Penstemon laetus subsp. sagittatus J. C. Roos 1948-9-2 3974 Siskiyou 6 miles SW of Yreka. Comment
  UCR25128  Penstemon newberryi John C. Roos 1942-6-25 1263 Mariposa Sierra Nevada Mtns., Yosemite National Park, top of Half Dome 2683 Comment
  RSA44887  Penstemon roezlii J. C. Roos 1948-9-2 3947 Siskiyou 6 miles SW of Yreka. Comment
  NY650664  Penstemon rostriflorus J. C. Roos 1952-7-28 5848 Inyo Wyman Canyon, White Mountains 2743.2 Comment
  CLARK-A1528-1217  Penstemon scapoides John C. Roos 1967-8-5 Inyo Inyo Mountains 3200 Comment
  GH367548  Penstemon scapoides J. C. Roos & L. Roos 1951-8-9 5122 Unknown east side Reed Flat, White Mts. 3048 Comment
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Nov 7 2017
  NY651577  Penstemon scapoides J. C. Roos 1953-8-8 5936 Inyo Hill behind Blue Bell Mine, Badger Flat, Inyo Mountains 2743.2 Comment
  UC1010185  Penstemon scapoides John and Lucille Roos 1951-8-9 5122 Inyo e side Reed Flat , e side Reed Flat (White Mts.) 3048 Comment
  UC1234847  Penstemon speciosus J. C. Roos 1955-6-17 6402 Inyo 2 mi ne Willow Spring; Last Chance Mountains 2011 Comment
  CLARK-A1528-4318  Penstemon spectabilis John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains 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
  UCR24126  Pericome caudata John C. Roos 1956-8-29 6595 Inyo Northern Mojave Desert, Panamint Mountains, head of Death Valley Canyon 2300 Comment
  CAS-BOT-BC423276  Peritoma lutea J. C. Roos 1955-6-21 6464 Inyo Near Willow Spring, Last Chance Mountains. 1828 Comment
  CAS-BOT-BC330358  Perityle megalocephala var. megalocephala J. C. Roos; A. R. Roos 1954-8-14 6217 Inyo The Narrows, Marble Canyon, Inyo Mts. 2179 Comment
  CAS-BOT-BC330359  Perityle megalocephala var. megalocephala J. C. Roos; A. R. Roos 1954-9-19 20169 Inyo Head of Marble Canyon, The Narrows, Inyo Mts. 2225 Comment
  UCSB42133  Persicaria lapathifolia Roos, John 1965-9-15 San Bernardino Mohave River at Victorville. Comment
  UCR19121  Petalonyx linearis John C. Roos, Lucille Roos 1949-4-6 4143 Riverside Sonoran (Colorado) Desert, Canyon in the Orocopia Mountains, 2.5 mi. NE of Dos Palmas Spring 152 Comment
  UCR26296  Petalonyx nitidus John C. Roos 1949-7-28 4523 San Bernardino Eastern Mojave Desert, Kingston Mtns, 0.2 mi below Beck's Spring 1341 Comment
  CAS-BOT-BC167710  Petalonyx nitidus John Roos; Lucille Roos 1954-6-28 6169 Inyo Loretto Road, west side Eureka Valley 1676 Comment
  UCR19126  Petalonyx thurberi John C. Roos 1965-6-23 s.n. Riverside Sonoran (Colorado) Desert, Eagle Mtns, Lost Palms Wash Comment
  RSA79659  Petradoria discoidea J. C. Roos 1953-8-9 5945 Inyo Tamarack Canyon, Inyo Mts. 2682 Comment
  CLARK-A1528-2026  Petradoria pumila John C. Roos 1949-6-22 4446 San Bernardino New York Mountains Comment
  CLARK-A1528-4013  Petrophytum caespitosum John C. Roos 1948-9-18 4043 San Bernardino Clark Mountain Comment
  RSA157867  Petrophytum caespitosum J. C. Roos, A. R. Roos 1955-8-26 6550 Inyo Canyon on east side of saddle between Squaw Peak and Waucoda Mt. Inyo mts. 2683 Comment
  UCR18906  Petrophytum caespitosum John C. Roos 1948-9-18 4043 San Bernardino Eastern Mojave Desert, Clark Mountain 1982 Comment
  RSA450435  Petrophytum caespitosum subsp. acuminatum J. C. Roos 1948-9-18 4043 San Bernardino Clark Mountain. 1982 Comment
  UC1234854  Petrophytum caespitosum subsp. caespitosum J. C. and A. R. Roos 1955-8-26 6550 Inyo canyon e side of saddle between Squaw Peak and Waucoba Mt; Inyo Mts 2682 Comment
  POM301542  Petunia parviflora J. C. Roos 1937-8-30 2559 San Diego Otay Comment
  RSA425012  Petunia parviflora J. C. Roos 1952-5-28 5728 Riverside San Jacinto River bottomland 1 mile south-east of Perris. 427 Comment
  CLARK-A1528-5436  Phacelia crenulata John C. Roos 1966-3-20 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-3002  Phacelia curvipes John C. Roos 1965-6-26 San Bernardino San Bernardino Mountains Comment
  RSA105043  Phacelia distans J. C. Roos 1955-5-15 6367 Inyo Last Chance Mountains: 0.5 miles west of Willow Springs. 1768 Comment
  RSA155670  Phacelia fremontii J. C. Roos 1955-6-17 6412 Inyo 2 miles NE of Willow Springs, Last Chance Mountains. 2012 Comment
  UCR26292  Phacelia fremontii John C. Roos 1950-4-26 4766 San Bernardino Mojave Desert, Rabbit Springs, north of Lucerne Valley 884 Comment
  CLARK-A1528-5136  Phacelia lemmonii John C. Roos 1937-5-31 675 Los Angeles San Gabriel Mountains Comment
  RSA47201  Phacelia lemmonii J. C. Roos 1949-6-20 4422 San Bernardino Keystone Canyon, New York Mts 1738 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
  CLARK-A1528-5081  Phacelia pedicellata John C. Roos 1937-4-27 677 San Bernardino 457 Comment
  UCR26048  Phacelia pediculoides John C. Roos, L. Roos 1954-5-6 6073 Inyo Northern Mojave Desert, Amargosa River bottom, 4 mi. north of Shoshone 518 Comment
  UCR26271  Phacelia pediculoides John C. Roos, L. Roos 1954-5-6 6073 Inyo Northern Mojave Desert, Amargosa River bottom, 4 mi. north of Shoshone 518 Comment
  RSA104825  Phacelia perityloides J. C. Roos 1955-5-13 6331 Inyo West base Last Chance Mountains, east of Eureka Valley sand dunes 1220 Comment
  CAS-BOT-BC154420  Phacelia ramosissima var. latifolia J. C. Roos 1965-6-27 s.n. San Bernardino Loma Linda Hills. 304 Comment
  RSA425018  Phacelia ramosissima var. latifolia J. C. Roos 1965-6-27 s.n. San Bernardino Loma Linda Hills. 305 Comment
  UCR18847  Phacelia rotundifolia John C. Roos, L. Roos 1952-7-31 5878 Inyo NW of Cedar Flat, White Mtns 2439 Comment
  CLARK-A1528-5108  Phacelia tanacetifolia John C. Roos 1937-3-26 681 Kern 152 Comment
  CLARK-A1528-5109  Phacelia viscida John C. Roos 1937-7-7 404 Los Angeles La Crescenta 478 Comment
  RSA443395  Phalaris aquatica J. C. Roos 1962-6-30 s.n. Riverside Head of Tin Mine Canyon Comment
  CLARK-A1528-4797  Phalaris lemmonii John C. Roos 1966-3-24 Riverside Winchester Comment
  LA102175  Phalaris lemmonii John C. Roos; 1966-3-24 sn Riverside Winchester (near Hemet) Comment
  POM301698  Phalaris lemmonii J. C. Roos 1940-6-11 1913 Marin junction of Highway 37 and 10, north of San Rafael Comment
Read comments
Jun 10 2015
  CLARK-A1528-4803  Phalaris minor John C. Roos 1952-4-21 5564 San Bernardino Loma Linda 304 Comment
  CLARK-A1528-4798  Phalaris paradoxa John C. Roos 1943-4-3 2616 Riverside San Timoteo Canyon 457 Comment
  CLARK-A1528-4799  Phalaris paradoxa John C. Roos 1952-5-21 5702 Riverside San Jacinto River 426 Comment
  POM301697  Phalaris paradoxa J. C. Roos 1940-6-10 1912 Sacramento West of Sacramento Comment
  UCR24038  Phalaris paradoxa John C. Roos 1940-6-10 1912 Sacramento Sacramento Valley, lowlands west of Sacramento 4 Comment
  RSA0057817  Philadelphus microphyllus var. stramineus J. C. Roos, L. Roos 1952-7-28 5843 Inyo Wyman Canyon, White Mountains. 2683 Comment
  CLARK-A1528-4806  Phleum pratense John C. Roos 1946-10-5 3110 San Bernardino San Bernardino Mountains 1356 Comment
  RSA443400  Phleum pratense J. C. Roos 1965-8-18 s.n. San Bernardino Moonridge, Bear Valley Comment
  SEINET956212  Phlox condensata J. C. Roos 1949-1 4580 San Bernardino Holcomb Valley, San Bernardino Mountains. 2195 Comment
  CLARK-A1528-3454  Phlox stansburyi John C. Roos, Lucille Roos 1952-7-27 5837 Inyo White Mountains Comment
  UCR27544  Phlox viridis John C. Roos 1947-4-20 3580 Inyo Northern Mojave Desert, Panamint Mountains near Telescope Peak, Wildrose Canyon 1585 Comment
  CLARK-A1528-3020  Pholistoma auritum John C. Roos 1937-3-26 1331 Santa Barbara Comment
  RSA92573  Pholistoma racemosum J. C. Roos, L. Roos 1954-4-10 6060 San Diego San Pasqual 152 Comment
  POM263080  Phoradendron californicum J. C. Roos 1937-4-26 523 San Bernardino Twenty-nine Palms Comment
  LA102181  Phragmites australis John C. Roos; 1950-8-7 sn Inyo Mojave Desert, China ranch on the Amargosa River S of Tecopa 426 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-A1528-4358  Physalis acutifolia John C. Roos 1937-6-9 1439 Imperial Westmorland Comment
  CLARK-A1528-890  Physalis acutifolia John C. Roos 1951-9-25 5263 Riverside Riverside 259 Comment
  POM262872  Physalis philadelphica J. C. Roos 1940-10-26 220 San Bernardino Loma Linda. Comment
  CAS-BOT-BC60709  Physaria kingii subsp. kingii John Roos; Lucille Roos 1952-7-26 5821 Inyo East side Reed Flat, White Mountains. 3048 Comment
  RSA659184  Physocarpus alternans J. C. Roos 1965-7-10 s.n. Inyo Eagle Springs, Panamint Mtns. Comment
  CLARK-A1528-3841  Pilostyles thurberi John C. Roos 1963-6-1 Imperial Comment
  CLARK-A1528-3575  Pinus attenuata John C. Roos 1948-1-31 3767 San Bernardino San Bernardino Mountains Comment
  UCR19216  Pinus balfouriana John C. Roos 1965-8-9 s.n. Inyo Sierra Nevada Mtns., Onion Valley, Independence Creek Comment
  CLARK-A1528-3547  Pinus coulteri John C. Roos 1948-6-19 3884 Riverside San Jacinto Mountains 1981 Comment
  CLARK-A1528-3585  Pinus coulteri John C. Roos 1942-6-20 1281 Riverside San Jacinto Mountains Comment
  POM262953  Pinus coulteri J. C. Roos 1936-5-3 700 San Diego Near Julian. Comment
  RSA47301  Pinus edulis J. C. Roos, Lucille Roos 1949-6-21 4424 San Bernardino New York Peak. 2134 Comment
  CLARK-A1528-3549  Pinus flexilis John C. Roos 1947-7-13 2818 Inyo Panamint Mountains 3352 Comment
  UC1010340  Pinus flexilis J. C. and A. R. Roos 1953-8-9 5972 Inyo Tamarack Canyon Inyo Mts., Tamarack Canyon 2865 Comment
  CLARK-A1528-3627  Pinus longaeva John C. Roos, Lucille Roos 1947-7-13 2819 Inyo Panamint Mountains 3322 Comment
  UC1029606  Pinus longaeva J. C. and A. R. Roos 1953-8-9 5956 Inyo Tamarck Canyon Inyo Mountains (upper end) 3048 Comment
  UCR19273  Pinus longaeva John C. Roos 1959-8-23 s.n. Mono White Mtns., Cottonwood Creek. 3049 Comment
  CLARK-A1528-3557  Pinus monophylla John C. Roos 1947-4-5 3435 Riverside San Jacinto Mountains 1310 Comment
  CLARK-A1528-3628  Pinus monophylla John C. Roos 1947-12-14 3764 Riverside Lost Palms Canyon Comment
  UCR19208  Pinus monophylla John C. Roos 1947-4-5 3435 Riverside Santa Rosa Mtns., Pinyon Flats 1311 Comment
  CLARK-A1528-3559  Pinus monophylla John C. Roos 1947-7-14 2817 Inyo Panamint Mountains 2468 Comment
  UC1023436  Piptatherum micranthum John and Lucille Roos 1952-7-28 5840 Inyo Wyman Canyon White Mts., Wyman Canyon (steep rocky n wall) Comment
  UCR19347  Piptatherum miliaceum John C. Roos 1959-6-27 s.n. San Bernardino San Bernardino Valley, Hwy. 99 - 395 [= I-10/395] interchange east of Colton 299 Comment
  UCR23995  Piptatherum miliaceum John C. Roos 1965-6-19 s.n. Riverside Peninsular Range; Santa Ana Mtns, Sky Line Drive, south of Corona 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
  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
  CLARK-A1528-5209  Pityrogramma triangularis John C. Roos 1949-6-27 4521 San Bernardino Kingston Range 1645 Comment
  CLARK-A1528-3590  Pityrogramma triangularis var. viscosa John C. Roos 1937-2-23 1316 Orange Laguna Hills Comment
  CLARK-A1528-2257  Plagiobothrys arizonicus John C. Roos 1937-3-25 1834 Kern Comment
  CLARK-A1528-2259  Plagiobothrys californicus John C. Roos 1952-2-29 5368 Riverside Reche Canyon 457 Comment
  RSA85109  Plagiobothrys canescens J. C. Roos 1952-4-30 5605 Riverside Hills between Camp Haan and Riverside 518 Comment
  RSA659769  Plagiobothrys canescens var. canescens J. C. Roos 1952-4-30 5605 Riverside Hills between Camp Haan and Riverside 518 Comment
  UCR25300  Plagiobothrys hispidulus John C. Roos 1947-6-21 3706 San Bernardino San Bernardino Mtns, Running Springs 1838 Comment
  UCR30506  Plagiobothrys leptocladus John C. Roos 1952-5-7 5623 Riverside Flats at Edgemont 488 Comment
  CLARK-A1528-3434  Plantago erecta John C. Roos 1937-3-5 1300 Riverside La Sierra 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
  UCR25391  Plantago ovata John C. Roos 1937-4-23 777 San Bernardino Little San Bernardino Mtns/Southern Mojave Desert, near Morongo Pass Comment
  CLARK-A1528-3435  Plantago virginica John C. Roos 1938-6-12 San Bernardino Loma Linda 304 Comment
  POM301485  Plantago virginica J. C. Roos 1937-6-13 1709 San Diego San Isidro Comment
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May 24 2009
  UCR19154  Platanthera sparsiflora John C. Roos 1949-7-4 4542 San Bernardino San Bernardino Mtns., Vivian Creek 2165 Comment
  CLARK-A1528-3415  Platystemon californicus John C. Roos 1966-3-24 Riverside Winchester Comment
  CAS-BOT-BC326676  Pleiacanthus spinosus J. C. Roos; E. C. Jaeger 1955-7-23 6509 Inyo Soldier Flat, east base Waucoba Mountains, Inyo Mountains 2194 Comment
  RSA155665  Pleuraphis jamesii J. C. Roos 1955-6-17 6404 Inyo 2 miles north of Willow Spring, Last Chance Mountains. 2011 Comment
  RSA92061  Pleuraphis jamesii J. C. Roos 1954-5-8 6095 Inyo Grapevine Mountains above Leadfield 1584 Comment
  LA102219  Pleurocoronis pluriseta John C. Roos; 1966-3-10 sn Riverside Chuckwalla Mountains, 3 mi. SE of Desert Center Comment
  CLARK-A1528-2057  Pluchea purpurascens John C. Roos 1937-8-31 2561 San Diego San Clemente Comment
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Sep 20 2014
  CLARK-A1528-2059  Pluchea sericea John C. Roos 1947-3-1 3301 Imperial Fish Springs Comment
  CLARK-A1528-283  Pluchea sericea John C. Roos, Lucille Roos 1951-10-24 5340 Riverside Pedley 228 Comment
  UCR23992  Pluchea sericea John C. Roos 1965-7-11 s.n. Inyo Northern Mojave Desert, Furnace Creek, Death Valley -61 Comment
  RSA457389  Poa bigelovii J. C. Roos 1955-4-8 6310 Inyo Last Chance Mtns, E of Eureka Valley sand dunes. aklt 4300ft, Inyo County 1311 Comment
  UCSB45961  Poa bigelovii Roos, John 1955-4-8 Inyo Last Chance Mtns.; east of Eureka Valley sand dunes 1310 Comment
  CLARK-A1528-4818  Poa bolanderi subsp. howellii John C. Roos 1939-6-24 918 San Bernardino Sawpit Canyon 1158 Comment
  CLARK-A1528-4819  Poa compressa John C. Roos, Lucille Roos 1950-7-5 4848 San Bernardino Loma Linda 323 Comment
  CLARK-A1528-4823  Poa fendleriana John C. Roos 1940-5-11 851 San Bernardino San Bernardino Mountains Comment
  UCSB51280  Poa howellii Roos, John; Roos, Lucille 1957-6-1 San Bernardino Yucaipa Ridge, 0.5 miles S.W. of Mill Creek Public Camp, Mill Creek, San Bernardino Mtns. Comment
  UCR25361  Poa pratensis John C. Roos 1952-5-7 5622 Riverside Flats at Edgemont 488 Comment
  CLARK-A1528-4838  Poa scabrella John C. Roos 1942-5-1 1158 Riverside Dry Morongo Canyon 609 Comment
  RSA61543  Poa secunda J. C. Roos 1950-6-3 4826 San Bernardino Rabbit Springs. Mojave desert. 884 Comment
  UCR20620  Poa secunda John C. Roos, L. Roos 1950-6-3 4826 San Bernardino Southern Mojave Desert, Rabbit Springs, Lucerne Valley 884 Comment
  UCR20622  Poa secunda John C. Roos, A. R. Roos 1953-8-13 6018 Inyo Northern Mojave Desert, Crest of Inyo Mtns, 3 mi east of Badger Flat 3308 Comment
  UCR24041  Poa secunda John C. Roos 1942-7-1 1270 Mariposa Sierra Nevada Mtns., Yosemite National Park, between Cloud's Rest and Half Dome 2287 Comment
  HSC78743  Poa secunda subsp. secunda J. C. Roos, L. Roos 1950-6-3 4826 San Bernardino Rabbit Springs, Mojave Desert. 884 Comment
  CLARK-A1528-3455  Polemonium chartaceum John C. Roos 1960-7-4 Mono White Mountains 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
Read comments
Jul 24 2016
  RSA0094953  Polemonium chartaceum John C. Roos 1960-7-4 s.n. Mono Crooked Creek, White Mtns. Comment
  UCR23713  Polycarpon tetraphyllum John C. Roos 1942-5-23 1061 Los Angeles Monrovia, 300 block on E Lime St. 179 Comment
  RSA47295  Polygala acanthoclada J. C. Roos, Roos 1949-6-22 4453 San Bernardino New York Mountains; Keystone Canyon 1738 Comment
  UCR23448  Polygala acanthoclada John C. Roos 1949-6-22 4453 San Bernardino Eastern Mojave Desert, Keystone Canyon, New York Mtns. 1829 Comment
  CLARK-A1528-3769  Polygonum amphibium var. emersum John C. Roos, Lucille Roos 1954-10-9 6253 Ventura Lake Sherwood 300 Comment
  CLARK-A1528-5207  Polygonum convolvulus John C. Roos 1959-7-30 Sonoma Healdsburg Garden Comment
  CLARK-A1528-3785  Polygonum douglasii John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  UCR24278  Polygonum douglasii John C. Roos 1940-7-16 s.n. San Bernardino San Bernardino Mtns., Green Valley Comment
  RSA69863  Polygonum lapathifolium J. C. Roos, Lucille Roos 1951-9-11 5200 San Bernardino Loma Linda. 320 Comment
  UCR25366  Polypodium californicum John C. Roos 1952-4-16 5547 Riverside Damp canyon off Reche Canyon. 518 Comment
  UCR30580  Polypogon monspeliensis John C. Roos, A. R. Roos 1950-8-7 s.n. San Bernardino Northeastern Mojave Desert, Beck Spring, Kingston Mountains 1372 Comment
  CAS-BOT-BC237528  Polypogon viridis J. C. Roos; A. C. Sanders 1965-6-12 s.n. San Bernardino Igo's near Mountain Home Village and Mill Creek, San Bernardino Mountains Comment
  RSA53583  Polypogon viridis J. C. Roos 1949-11-16 4695 San Bernardino Loma Linda. 329 Comment
  UCR24383  Populus balsamifera subsp. trichocarpa John C. Roos 1946-9-28 3095 San Bernardino San Bernardino Mtns., Near Fish Creek 2241 Comment
  CLARK-A1528-4066  Populus tremuloides John C. Roos 1967-7-8 San Bernardino San Bernardino Mountains 2133 Comment
  CLARK-A1528-4070  Populus tremuloides John C. Roos 1948-9-7 Mono Sierra Nevada Comment
  POM266317  Porophyllum gracile J. C. Roos 1937-5-10 2337 Orange East of San Juan Capistrano. Comment
  CAS-BOT-BC233729  Portulaca halimoides John Roos; Lucille Roos 1952-10-18 5900 Riverside Hidden Valley Campground, Little San Bernardino Mts. 1219 Comment
  UCR23514  Potentilla biennis John C. Roos 1937-8-5 1025 Inyo White Mtns., White Mtns. Comment
  CLARK-A1528-4016  Potentilla breweri John C. Roos 1937-8-8 537 Inyo Sierra Nevada 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
  UCSB37792  Potentilla gracilis Roos, John 1965-7-18 San Bernardino Moonridge, Bear Valley, San Bernardino Mtns. Comment
  RSA450249  Potentilla gracilis var. elmeri J. C. Roos 1965-7-18 s.n. San Bernardino Moonridge, Bear Valley, San Bernardino Mountains. Comment
  NY833090  Potentilla morefieldii J. C. Roos 1951-8-10 5140 Mono Saddle 1 mile southeast of White Mountain Peak, White Mountains 3962 Comment
  UCR23547  Proboscidea althaeifolia John C. Roos 1965-9-5 s.n. Riverside Sonoran (Colorado) Desert, 17 miles west of Blythe 122 Comment
  RSA0013900  Proboscidea louisianica J. C. Roos 1948-9-2 4024 Colusa West of Williams. Comment
  CLARK-A1528-3400  Proboscidea parviflora John C. Roos 1959-8-5 San Bernardino Loma Linda Comment
  CLARK-A1528-2872  Prosopis pubescens John C. Roos 1965-7-11 Inyo Death Valley Comment
  CLARK-A1528-3155  Prunella vulgaris John C. Roos 1965-7-31 San Bernardino San Bernardino Mountains Comment
  GH346323  Prunus andersonii J. C. Roos 1955-5-15 6370 Unknown Willow Spring, Last Chance Mts. 1828 Comment
  CLARK-A1528-4027  Prunus emarginata John C. Roos 1965-7-18 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4028  Prunus emarginata John C. Roos 1937-8-18 2410 Riverside San Jacinto Mountains Comment
  CLARK-A1528-4033  Prunus fremontii John C. Roos 1937-4-18 San Diego Jacumba Comment
  UCR26205  Prunus virginiana John C. Roos 1947-5-31 3659 Los Angeles San Gabriel Mountains, Big Pines 2134 Comment
  CLARK-A1528-2067  Psathyrotes ramosissima John C. Roos 1937-8-25 2023 San Bernardino Comment
  UCD135049  Pseudognaphalium biolettii John Roos 1947-3-21 3372 Riverside Plateau', Reche Canyon. Comment
  UCR26135  Pseudognaphalium biolettii John C. Roos 1952-2-29 5374 Riverside Reche Canyon Comment
  UCSB45955  Pseudognaphalium stramineum Roos, John 1965-7-18 San Bernardino Bear Valley, San Bernardino Mtns. Comment
  RSA592494  Pseudostellaria jamesiana J. C. Roos 1965-7-18 s.n. San Bernardino Moonridge, Bear Valley, San Bernardino Mountains. Comment
  CLARK-A1528-2068  Psilocarphus brevissimus John C. Roos 1937-5-10 2498 Riverside Lake Elsinore Comment
  UCR18981  Psoralea physodes John C. Roos 1960-5-30 s.n. Riverside Santa Ana Mtns., Ridge north of Bedford Peak. 1220 Comment
  UCR18995  Psorothamnus arborescens var. arborescens John C. Roos 1947-4-18 3444 San Bernardino Central Mojave Desert, hills 3 mi. west of Barstow Comment
  UCR25855  Psorothamnus emoryi John C. Roos, Lucille Roos 1949-4-6 4139 Riverside Sonoran (Colorado) Desert, east of Mecca Comment
  UCR23857  Psorothamnus schottii John C. Roos 1966-5-2 s.n. Riverside Western Colorado Desert, mouth of Pushawalla Canyon, Indio Mtns [Hills]. Comment
  UCSB42194  Psorothamnus schottii Roos, John 1966-5-2 Riverside At the mouth of Pushawalla Canyon, Indio Mtns. Comment
  CLARK-A1528-1307  Pterospora andromedea John C. Roos 1937-7-20 1993 San Bernardino San Bernardino Mountains Comment
  UCR30818  Pterospora andromedea Lucille Roos 1965-8-10 s.n. Siskiyou Klamath National Forest, Bear Lake, Marble Mountains 1473 Comment
  UCR24288  Pterostegia drymarioides John C. Roos 1942-5-23 1067 Los Angeles Transverse Range; San Gabriel Mtns., Chantry Flats, Santa Anita Canyon Comment
  CLARK-A1528-5621  Pulicaria hispanica John C. Roos 1962-10-19 Riverside Whitewater 548 Comment
  UC1234824  Purshia mexicana var. stansburyana J. C. Roos 1955-7-21 6492 Inyo 1 mi s Willow Spring; Last Chance Mountains 2072 Comment
  CAS-BOT-BC143780  Purshia stansburyana John Roos; Lucille Roos 1947-7-14 2879 Inyo Mahogany Flats, Panamint Mts. 2468 Comment
  POM261395  Purshia stansburyana J. C. Roos 1941-8-17 71 Inyo Panamint Mountains; Wildrose Canyon at Kilns Comment
  UCR23467  Purshia stansburyana John C. Roos, A. R. Roos 1954-6-14 s.n. Inyo Northern Mojave Desert, Panamint Mtns, head of Wildrose Canyon 2439 Comment
  RSA72073  Purshia tridentata var. tridentata J. C. Roos, Lucille Roos 1951-8-12 5187 Inyo 1 mile S of Reed Flat. White Mtns. 2957 Comment
  RSA74606  Purshia tridentata var. tridentata J. C. Roos, L. Roos 1951-8-12 5187 Inyo 1 mi. south of Reed Flat, White Mts. 2957 Comment
  UC1494275  Pyrrocoma racemosa var. paniculata J. C. Roos 1965-7-11 Inyo Tecopa Comment
  POM274225  Pyrrocoma sessiliflora J. C. Roos 1947-9-20 2815 Inyo South end Owen Lake at Olancha Comment
  POM266367  Pyrrocoma uniflora var. gossypina J. C. Roos 1937-7-26 2472 San Bernardino Bear Valley, Pine Knot. Comment
  UCR34463  Pyrrocoma uniflora var. gossypina John C. Roos 1949-7-23 4583 San Bernardino San Bernardino Mtns., Holcomb Valley Comment
  CLARK-A1528-5679  Quercus X morehus John C. Roos 1943-2-28 2591 San Bernardino San Bernardino Mountains 2072 Comment
  CLARK-A1528-2916  Quercus agrifolia John C. Roos 1939-4-16 283 Napa Angwin 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
  RSA450473  Quercus agrifolia var. oxyadenia J. C. Roos 1965-9-26 s.n. Riverside San Janinto & Santa Rosa Mountains: hills near summit of Pines to Palms Highway. Comment
  UCR23913  Quercus chrysolepis John C. Roos 1949-6-22 4455 San Bernardino Eastern Mojave Desert, New York Mtns, canyon bottoms and up to the summit of Keystone Canyon. 2256 Comment
  UCSB46878  Quercus chrysolepis Roos, John 1965-6-6 San Bernardino Mill Creek, near Fallsvale, San Bernardino Mtns. Comment
  CAS-BOT-BC94212  Quercus engelmannii J. C. Roos 1965-10-10 s.n. San Diego 5 mi NE of Fallbrook Comment
  RSA450123  Quercus engelmannii J. C. Roos 1965-10-10 s.n. San Diego 5 mi NE of Fallbrook. Comment
  CLARK-A1528-2927  Quercus kelloggii John C. Roos 1946-9-4 2944 San Bernardino San Bernardino Mountains Comment
  POM262791  Quercus lobata J. C. Roos 1939-3-27 282 Napa Angwin, Howell Mountains. Comment
  CLARK-A1528-5678  Quercus palmeri John C. Roos 1967-5-20 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2913  Quercus wislizeni John C. Roos 1939-4-16 284 Napa Angwin Comment
  UCR18990  Quercus wislizeni John C. Roos 1965-9-26 s.n. Riverside Santa Rosa Mtns, Near summit of Palms to Pines Hwy 1524 Comment
  CLARK-A1528-1174  Quercus wislizeni var. frutescens John C. Roos 1946-9-15 3011 San Bernardino San Bernardino Mountains 2224 Comment
  CLARK-A1528-1175  Quercus wislizeni var. frutescens John C. Roos 1946-9-1 2979 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2908  Quercus wislizeni var. frutescens John C. Roos 1947-1-4 3196 Riverside Box Springs Mountains 487 Comment
  CLARK-A1528-2909  Quercus wislizeni var. frutescens John C. Roos 1940-5-11 850 San Bernardino San Bernardino Mountains 1219 Comment
  CLARK-A1528-2075  Rafinesquia neomexicana John C. Roos 1947-3-1 3304 Riverside Garnet Comment
  CLARK-A1528-2074  Raillardella argentea John C. Roos 1946-9-4 2951 San Bernardino San Bernardino Mountains 3413 Comment
  CLARK-A1528-3873  Ranunculus cymbalaria John C. Roos 1960-7-4 Mono White Mountains Comment
  UCR23458  Ranunculus cymbalaria John C. Roos 1946-9-21 3062 San Bernardino Mojave Desert, Rabbit Springs, Lucerne Valley 887 Comment
  RSA450092  Ranunculus cymbalaria var. saximontanus J. C. Roos 1965-6-26 s.n. San Bernardino Upper Sana Ana Canyon, Heart Bar area. Comment
  UCR25385  Ranunculus eschscholtzii John C. Roos 1937-8-8 980 Inyo Sierra Nevada Mtns., Lone Pine Canyon below Mt. Whitney 3506 Comment
  POM265651  Reseda odorata J. C. Roos 1937-8-31 2563 San Diego Oceanside Comment
  CLARK-A1528-3904  Rhamnus californica John C. Roos 1937-6-8 San Diego Warner Springs Comment
  CLARK-A1528-3905  Rhamnus californica John C. Roos 1968-9-21 San Bernardino San Bernardino Mountains 1219 Comment
  RSA450094  Rhamnus californica J. C. Roos 1965-6-6 s.n. San Bernardino San Bernardino Mtns, Mill Creek near Fallsvale. Comment
  UCR18918  Rhamnus pilosa John C. Roos 1937-6-14 531 San Diego Peninsular Range, Alpine Comment
  UCR23636  Rhododendron occidentale John C. Roos 1957-7-2 6645 Sonoma Miller Ridge Comment
  CLARK-A1528-5597  Rhus integrifolia John C. Roos 1950-2-25 4709 San Bernardino Santa Ana River 396 Comment
  CLARK-A1528-5598  Rhus integrifolia John C. Roos 1950-2-25 4709 San Bernardino Santa Ana River 396 Comment
  CAS-BOT-BC167969  Rhus ovata John C. Roos 1950-10-15 5007 Riverside Dry Morongo Canyon about 1 mile S. of Riverside-San Bernardino County line 609 Comment
  CLARK-A1528-2406  Rhus trilobata John C. Roos 1948-5-15 3831 Riverside Eagle Mountains Comment
  CLARK-A1528-4116  Ribes amarum John C. Roos 1942-3-21 1092 Los Angeles San Gabriel Mountains Comment
  CAS-BOT-BC93343  Ribes cereum J. C. Roos; A. R. Roos 1953-8-9 5970 Inyo Southeast of Tamarck Canyon, Inyo Mountains. 3230 Comment
  CAS-BOT-BC93344  Ribes cereum John Roos; Lucille Roos 1954-6-29 6190 Inyo The Narrows, Marble Canyon, Inyo Mountains. 2209 Comment
  CLARK-A1528-4127  Ribes cereum John C. Roos 1946-8-27 2782 Riverside Santa Rosa Mountains Comment
  RSA155732  Ribes cereum J. C. Roos 1955-6-19 6450 Inyo Last Chance Mountains: Whitetop Peak, 2 miles west of Last Chance Spring. 2576 Comment
  RSA47302  Ribes cereum J. C. Roos, L. Roos 1949-6-24 4484 San Bernardino North slope of Clark Mountain. 2256 Comment
  RSA0025035  Ribes divaricatum var. pubiflorum J. C. Roos 1939-4-1 312 Sonoma Hood Peak Range west of Calistoga. Comment
  CLARK-A1528-4129  Ribes indecorum John C. Roos 1947-3-15 3341 Riverside San Jacinto Mountains Comment
  RSA0021116  Ribes lasianthum J. C. Roos 1937-5-31 10 Los Angeles Big Pines. Comment
  CLARK-A1528-4133  Ribes malvaceum var. viridifolium John C. Roos 1966-2-11 Los Angeles Claremont 304 Comment
  RSA450229  Ribes malvaceum var. viridifolium J. C. Roos 1966-2-11 s.n. Los Angeles Claremont. Comment
  CLARK-A1528-4136  Ribes montigenum John C. Roos 1946-9-4 2949 San Bernardino San Gorgonio Peak 3413 Comment
  CLARK-A1528-5730  Ribes quercetorum John C. Roos 1952-2-18 5354 Riverside Reche Canyon 761 Comment
  CLARK-A1528-4143  Ribes roezlii John C. Roos 1940-5-11 844 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-4146  Ribes roezlii John C. Roos 1965-6-6 San Bernardino San Bernardino Mountains Comment
  POM262780  Ribes roezlii J. C. Roos 1939-5-26 711 San Bernardino Bluff Lake, San Bernardino Mountains 2287 Comment
  CLARK-A1528-4156  Ribes velutinum John C. Roos 1948-7-3 3900 Inyo Panamint Mountains Comment
  RSA47304  Ribes velutinum J. C. Roos 1949-6-27 4503 San Bernardino Kingston Mts 1982 Comment
  UCR19140  Ribes velutinum John C. Roos, L. Roos 1954-6-26 6164 Inyo Northern Mojave Desert, Inyo Mtns, Mazourka Canyon 2439 Comment
  CLARK-A1528-443  Ricinus communis John C. Roos 1951-10-4 5317 San Bernardino San Bernardino 320 Comment
  LA102248  Romneya coulteri John C. Roos; 1952-6-8 sn San Bernardino San Timoteo Canyon, S. of Redlands 457 Comment
  CLARK-A1528-2336  Rorippa nasturtium-aquaticum John C. Roos 1948-4-24 3795 Riverside Whitewater Comment
  UCR23436  Rorippa sphaerocarpa John C. Roos 1965-7-18 s.n. San Bernardino San Bernardino Mtns, Bear Valley Comment
  CLARK-A1528-824  Rosa californica John C. Roos 1951-9-25 5261 Riverside Riverside Comment
  RSA659659  Rosa woodsii J. C. Roos 1948-7-4 s.n. Inyo Thorndykes Spring, Panamint Mtns. Comment
  UCR23512  Rosa woodsii var. glabrata John C. Roos 1946-9-21 3047 San Bernardino San Bernardino Mtns., Cushenbury Spring 1280 Comment
  UCSB37356  Rubus leucodermis Roos, John 1965-7-17 San Bernardino Barton Flats, San Bernardino Mtns Comment
  UCR25376  Rubus pensilvanicus John C. Roos 1949-4-2 4137 San Bernardino San Bernardino Valley, NE corner of Waterman Ave. and Mill St., San Bernardino 309 Comment
  POM265701  Rumex crispus J. C. Roos 1942-10-19 2570 Los Angeles On vacant lot, West Los Angeles. Comment
  CLARK-A1528-1001B  Rumex triangulivalvis John C. Roos 1937-7-29 1982 San Bernardino Bluff Lake 2316 Comment
  RSA443540  Rupertia rigida J. C. Roos 1965-7-31 s.n. San Bernardino Barton Flats, Camp Oceola Comment
  UCSB42110  Ruta graveolens Roos, John 1950-4-22 Riverside Pass between Reche Canyon and Pigeon Pass Road 457 Comment
  POM264308  Sagina saginoides J. C. Roos 1937-6-22 641 San Bernardino Near South Fork of Santa Ana River. Comment
Read comments
Oct 26 2013
  POM301710  Sagittaria latifolia J. C. Roos 1937-8-4 1952 Inyo Owens River, near Lone Pine. Comment
  CLARK-A1528-4053  Salix exigua John C. Roos 1937-4-26 618 San Bernardino Providence Mountains Comment
  CLARK-A1528-4056  Salix laevigata John C. Roos 1947-11-1 3758 Riverside Eagle Mountains Comment
  RSA659608  Salix laevigata J. C. Roos 1952-2-18 5351 Riverside At west end of Fairmount Park, Riverside. 259 Comment
  UCR23243  Salix lasiolepis John C. Roos 1949-8-14 4617 San Bernardino Eastern Mojave Desert, Keystone Canyon, New York Mtns. 1707 Comment
  UCR26204  Salix lasiolepis John C. Roos, L. Roos 1952-3-1 5383 Riverside 2.5 miles north of Moreno by a seep below reservoir 610 Comment
  POM262963  Salix scouleriana J. C. Roos 1937-7-16 620 Los Angeles Near Mt. San Antonio, San Gabriel Mountains. 2287 Comment
  CLARK-A1528-4367  Salpichroa origanifolia John C. Roos 1949-10-12 4690 San Bernardino Loma Linda 335 Comment
  RSA79486  Salsola tragus J. C. Roos, A. Roos 1953-8-13 6008 Inyo Tamarack Canyon. 2744 Comment
  CLARK-A1528-5348  Salvia X bernardina John C. Roos, Lucille Roos 1951-10-3 5314 San Bernardino Loma Linda 320 Comment
  CLARK-A1528-590  Salvia X bernardina John C. Roos, Lucille Roos 1951-10-3 5314 San Bernardino Loma Linda 320 Comment
  UCR18811  Salvia X bernardina John C. Roos, L. Roos 1951-10-3 5314 San Bernardino San Bernardino Valley, Loma Linda. 320 Comment
  UCR18808  Salvia apiana John C. Roos 1965-6-13 s.n. Riverside Santa Rosa Mtns., Dos Palmas Spring Comment
  CAS-BOT-BC220749  Salvia clevelandii John Roos; Lucille Roos 1950-8-19 4943 San Diego Torrey Pines Park 60 Comment
  RSA47460  Salvia dorrii var. pilosa J. C. Roos 1949-5-28 4334 San Bernardino North slope of washes, Clark Mtn, near Green's Mine 1616 Comment
  CLARK-A1528-3114  Salvia funerea John C. Roos, Lucille Roos 1954-3-27 6051 Inyo Death Valley National Park 853 Comment
  UC1010280  Salvia funerea John and Lucille Roos 1954-3-27 6057 Inyo below Klare Spring (Titus Canyon); Death Valley, Grapevine Mts. 914 Comment
  CLARK-A1528-3115  Salvia funerea John C. Roos 1938-4-17 1621 Inyo Death Valley Park Nursery Comment
  CLARK-A1528-1327  Salvia greatae John C. Roos 1949-4-6 Imperial Chocolate Mountains 91 Comment
  CLARK-A1528-3120  Salvia mohavensis John C. Roos 1942-5-1 1113 San Bernardino Little San Bernardino Mountains Comment
  CLARK-A1528-3121  Salvia mohavensis John C. Roos 1943-5-23 2684 San Bernardino Little San Bernardino Mountains Comment
  CLARK-A1528-3122  Salvia mohavensis John C. Roos 1965-6-23 Riverside Lost Palms Canyon Comment
  SEINET12325161  Sambucus caerulea J. C. Roos 1965-1 s.n. Inyo Upper Wildrose Canyon, Panamint Mountains Comment
  RSA591730  Sambucus mexicana J. C. Roos 1965-6-27 s.n. San Bernardino Loma Linda Hills. 305 Comment
  CLARK-A1528-4858  Sanicula bipinnatifida John C. Roos 1937-4-17 1380 San Bernardino Redlands Comment
  CLARK-A1528-4938  Sanicula bipinnatifida John C. Roos 1937-6-15 1675 San Diego Cuyamaca Lake Comment
  CLARK-A1528-2192  Sanvitalia abertii John C. Roos 1950-9-1 4954 San Bernardino Clark Mountain 1645 Comment
  CLARK-A1528-1468  Sarcostemma cynanchoides John C. Roos 1940-8-20 906 Riverside Reche Canyon Comment
  SEINET13947746 Image available Satureja douglasii J. C. Roos 1948-1 3963 Monterey 3400 ft elev 1036 Comment
  UCR19303  Schismus barbatus John C. Roos 1952-3-19 5400 Riverside Peninsular Range, Box Springs Mountains [east edge of Riverside] 457 Comment
  CLARK-A1528-2458  Scopulophila rixfordii John C. Roos, Lucille Roos 1954-5-8 6097 Inyo Grapevine Mountains 1371 Comment
  RSA40585  Scrophularia californica var. desertorum J. C. Roos 1947-7-13 2892 Inyo East slope Baldy Peak, Panamint Mts. Comment
  UCR23623  Scutellaria siphocampyloides John C. Roos 1940-8-17 1598 San Bernardino San Bernardino Mountains, Barton Flats 1994 Comment
  RSA0076362  Sedum lanceolatum J. C. Roos 1937-8-8 342 Inyo Lone Pine Canyon. 2744 Comment
  CLARK-A1528-2625  Sedum rosea subsp. integrifolium John C. Roos 1937-8-8 1614 Inyo Lone Pine Canyon Comment
  RSA0078613  Sedum spathulifolium J. C. Roos 1965-6-28 s.n. San Bernardino Mill Creek canyon, San Bernardino Mtns. At Igo's. Comment
  UCR30829  Sedum stenopetalum John C. Roos 1937-8-8 342 Inyo Sierra Nevada Mtns., Lone Pine Canyon below Mt. Whitney 3506 Comment
Read comments
Dec 21 2020
  CLARK-A1528-4080  Selaginella watsonii John C. Roos, Lucille Roos 1951-8-10 5147 Mono White Mountain 4297 Comment
  RSA0010744  Senecio astephanus J. C. Roos, Lucille Roos 1952-6-14 5771 San Bernardino Mill Creek S of Mill Creek Public Camp 1159 Comment
  UCR19257  Senecio flaccidus var. monoensis John C. Roos 1947-11-1 3757 Riverside Sonoran (Colorado) Desert, Eagle Mtns, Lost Palms Canyon 976 Comment
  RSA0125063  Senecio integerrimus var. exaltatus John C. Roos, Lucille Roos 1952-7-30 5870 Mono Crooked Creek, White Mts. 3049 Comment
  CLARK-A1528-2084  Senecio ionophyllus John C. Roos 1964-6-26 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2085  Senecio jacobaea John C. Roos 1957-7-1 6625 Mendocino Fort Bragg Comment
  CAS-BOT-BC332948  Senecio spartioides John Roos; Lucille Roos 1951-8-8 5102 Mono Big Prospector Meadow at head of Crooked Creek, Whtie Mountains 3169 Comment
  CAS-BOT-BC332974  Senecio spartioides J. C. Roos; R. Roos 1966-9-13 s.n. San Bernardino On a ridge between the headwaters of Fish Creek and North Fork meadows, San Bernardino Mountains. Comment
  CLARK-A1528-2090  Senecio spartioides John C. Roos 1966-9-13 San Bernardino San Bernardino Mountains Comment
  CLARK-A1528-2091  Senecio spartioides John C. Roos 1946-9-15 3038 San Bernardino San Bernardino Mountains 3169 Comment
  UCR30518  Senecio spartioides John C. Roos 1937-7-28 2430 San Bernardino San Bernardino Mtns, Van Deusen Canyon [Caribou Creek], near Bear Valley 2195 Comment
  UCR18868  Senecio triangularis 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
  POM265689  Senna covesii J. C. Roos 1937-4-28 787 San Bernardino Turtle Mountains. Comment
  CLARK-A1528-5028  Setaria geniculata John C. Roos 1946-8-26 2931 San Bernardino Loma Linda Comment
  POM301694  Setaria parviflora J. C. Roos 1937-8-27 738 San Bernardino San Bernardino. Comment
  UCR31319  Setaria parviflora John C. Roos 1951-9-23 5240 San Bernardino San Bernardino Valley, 2 miles west of Loma Linda 305 Comment
  CLARK-A1528-1257  Setaria viridis John C. Roos 1937-7-12 1504 San Bernardino Loma Linda 365 Comment
  UCR18960  Silene andersonii John C. Roos 1941-8-17 59 Inyo Northern Mojave Desert, Panamint Mountains 3319 Comment
  CLARK-A1528-2467  Silene lemmonii John C. Roos 1937-6-17 2385 San Diego Palomar Mountain Comment
  CLARK-A1528-2468  Silene lemmonii John C. Roos 1941-6-1 93 San Bernardino San Bernardino Mountains Comment
Read comments
Feb 20 2015
  UCR23677  Silene lemmonii John C. Roos 1965-6-12 s.n. San Bernardino San Bernardino Mtns., Mill Creek, Igo's [Store] near Mountain Home Village 1220 Comment
  UCR23653  Silene menziesii John C. Roos 1958-7-26 s.n. San Bernardino San Bernardino Mtns, South Fork of the Santa Ana River Comment
  CLARK-A1528-2469  Silene parishii John C. Roos 1966-8-6 San Bernardino San Bernardino Mountains Comment
  POM262923  Simmondsia chinensis J. C. Roos 1941-4-5 184 San Bernardino Coyote Well. Comment
  CLARK-A1528-5036  Sitanion hansenii John C. Roos, Lucille Roos 1951-8-8 5094 Inyo White Mountains 3169 Comment
  CLARK-A1528-5043  Sitanion hansenii John C. Roos 1952-6-13 5765 Riverside Reche Canyon 457 Comment
  CLARK-A1528-4369  Solanum douglasii John C. Roos 1965-8-23 San Bernardino Loma Linda Elevation 1000+ ft Comment
  CLARK-A1528-892  Solanum douglasii John C. Roos 1951-9-25 5296 Riverside Riverside 259 Comment
  RSA47200  Solanum triflorum J. C. Roos, L. Roos 1949-6-25 4489 San Bernardino Colisseum Mine, north side of Clark Mts. 1616 Comment
  RSA48873  Solidago confinis J. C. Roos 1949-9-3 4653 Inyo Tecopa 427 Comment
  UCR25295  Solidago confinis John C. Roos 1946-9-21 3043 San Bernardino N slope San Bernardino Mtns/S Mojave Desert, Box 'S' Springs 1082 Comment
  CLARK-A1528-295  Solidago occidentalis John C. Roos 1951-9-25 5282 Riverside Riverside 259 Comment
  UCR24169  Solidago occidentalis John C. Roos 1946-10-2 s.n. San Bernardino San Bernardino Valley, south of San Bernardino 305 Comment
  CAS-BOT-BC365819  Soliva sessilis John Roos; Lucille Roos 1953-5-9 5916 Riverside Fairmount Park, Riverside 259 Comment
  UC1023427  Soliva sessilis John and Lucille Roos 1953-5-9 5916 Riverside Fairmount Park 259 Comment
  CLARK-A1528-5540  Sorghum bicolor Alfred R. Roos 1936-11-11 Riverside Riverside 243 Comment
  CLARK-A1528-2475  Spergularia bocconi John C. Roos 1966-3-13 Riverside Winchester Comment
  UCSB42171  Spergularia bocconi Roos, John 1966-3-13 Riverside On roadside, Winchester Comment
  UCR23704  Spergularia macrotheca John C. Roos 1956-5-27 6583 San Bernardino San Bernardino Valley, north side of Hwy 99, 0.2 mi west of Waterman Ave 305 Comment
  CLARK-A1528-5318  Spergularia marina John C. Roos 1947-5-10 3623 San Bernardino Loma Linda Comment
  UCR23705  Spergularia marina John C. Roos 1952-4-14 5538 San Bernardino San Bernardino Valley, Loma Linda. 305 Comment
  UCR25931  Spergularia marina John C. Roos 1947-3-15 3349 Riverside Santa Rosa Mountains/Colorado Desert, Deep Canyon 366 Comment
  UCR25932  Spergularia marina John C. Roos, L. Roos 1951-10-24 5337 Riverside Santa Ana River, at Pedley 229 Comment
  CLARK-A1528-7748  Sphaeralcea ambigua John C. Roos 1965-6-16 San Bernardino Adelanto Comment
  UCR23557  Sphaeralcea ambigua John C. Roos 1965-6-16 s.n. San Bernardino Western Mojave Desert, four miles north of Adelanto 854 Comment
  RSA105030  Sphaeralcea ambigua subsp. monticola J. C. Roos 1955-5-15 6379 Inyo Willow Creek, Last Chance Mts. 1524 Comment
  UC1010263  Sphaeralcea ambigua var. ambigua John C. Roos 1952-4-16 5542 Riverside Box Springs 487 Comment
  GH420971  Sphaeralcea ambigua var. pulchella J. C. Roos 1955-5-15 6379 Unknown Willow Creek, Last Chance Mts. 1524 Comment
  RSA45522  Sphaeralcea emoryi J. C. Roos, L. Roos 1949-4-7 4174 Imperial near Winterhaven 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
  UCR24189  Spiranthes romanzoffiana John C. Roos 1937-8-18 1221 Riverside San Jacinto Mountains, Taquitz Valley 2500 Comment
  UCR30609  Sporobolus airoides John C. Roos, A. R. Roos 1950-8-7 4924 Inyo Northern Mojave Desert, Tecopa in Amargosa River Valley 427 Comment
  CLARK-A1528-5033  Sporobolus contractus John C. Roos 1950-9-3 4982 San Bernardino Clark Mountains 1523 Comment
  RSA52774  Sporobolus contractus J. C. Roos 1950-9-1 4948 San Bernardino Valley Wells, eastern Mojave Desert. 1128 Comment
  CAS-BOT-BC235438  Sporobolus cryptandrus J. C. Roos; A. R. Roos 1955-8-26 6560 Inyo Soldier Flat, east base Waucoba Mt., Inyo Mts. 2164 Comment
  CAS-BOT-BC235448  Sporobolus cryptandrus J. C. Roos 1965-6-7 s.n. San Bernardino Victorville Comment
  UCSB45563  Sporobolus cryptandrus Roos, John 1965-6-7 San Bernardino Victorville Comment
  CLARK-A1528-5542  Sporobolus flexuosus John C. Roos 1946-9-14 3021 Riverside Asbestos Mountain 1066 Comment
  RSA89869  Sporobolus flexuosus J. C. Roos 1950-10-21 5016 San Bernardino N base of Little San bernardino Mtns. 915 Comment
  UC1023422  Sporobolus flexuosus John C. Roos 1950-9-1 4949 San Bernardino Valley Wells Station Mojave Desert, Valley Wells Station 1127 Comment
  UCR23277  Sporobolus flexuosus John C. Roos, L. Roos 1950-10-21 5016 San Bernardino Mojave Desert, Joshua Tree [city], N base of Little San Bernardino Mtns. 915 Comment
  UCSB51360  Sporobolus indicus J. C. Roos 1965-11-4 Riverside collected on a lawn at the Fairmont Park, in Riverside Fairmont Park Comment
  CLARK-A1528-5046  Sporobolus poiretii John C. Roos, Lucille Roos 1951-9-25 5277 Riverside Riverside 259 Comment
  CLARK-A1528-4919  Stachys ajugoides var. rigida John C. Roos 1937-5-10 614 San Diego San Juan Capistrano Comment
Read comments
Nov 9 2016
  CLARK-A1528-4918  Stanleya elata John C. Roos 1947-7-15 2822 Inyo Argus Mountains Comment
  UC1236240  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
  UCR23434  Stanleya pinnata John C. Roos 1955-5-16 6391 Inyo Northern Mojave Desert, west side Inyo Mtns., Waucoba Road 6 mi east of Big Pine 1494 Comment
  NY185734  Stanleya pinnata subsp. inyoensis J. C. Roos 1954-6-28 6177 Inyo Southeast end of Eureka Valley 3000 Comment
  CLARK-A1528-370  Stanleya pinnata subsp. pinnata John C. Roos 1971-4-26 San Bernardino Joshua Tree National Park 609 Comment
  UCR23435  Stanleya pinnata var. inyoensis John C. Roos 1955-5-13 6353 Inyo Northern Mojave Desert, SE end of Eureka Valley 945 Comment
  CAS-BOT-BC60964  Stanleya pinnata var. pinnata John C. Roos 1955-5-13 6353 Inyo Southeast end Eureka Valley. 914 Comment
  CAS-BOT-BC60965  Stanleya pinnata var. pinnata John C. Roos 1955-5-13 6353 Inyo Southeast end Eureka Valley. 914 Comment
  CLARK-A1528-2106  Stephanomeria cichoriacea John C. Roos 1965-10-2 San Bernardino San Bernardino Mountains Comment
  POM263096  Stephanomeria cichoriacea J. C. Roos 1937-7-16 392 San Bernardino Above Stockton Flats. San Gabriel Mountains. Comment
  UCSB49868  Stephanomeria cichoriacea Roos, John 1965-10-2 San Bernardino East Fork Mtn. Home Canyon, San Bernardino Mtns. Comment
  UCR24208  Stephanomeria parryi John C. Roos 1937-5-30 2496 San Bernardino Mojave Desert, Hesperia Comment
  CLARK-A1528-4969  Stephanomeria pauciflora John C. Roos 1947-7-15 2828 Inyo Panamint Mountains 914 Comment
  RSA158109  Stephanomeria spinosa J. C. Roos, E. C. Jaeger 1955-7-23 6509 Inyo Soldier Flat on E base of Wancoba Mtn. 2195 Comment
  CLARK-A1528-2714  Stillingia paucidentata John C. Roos 1969-5-10 Kern Red Rock Canyon Comment
  CLARK-A1528-5271  Stipa californica John C. Roos, Lucille Roos 1951-8-8 5107 Inyo White Mountains 3169 Comment
  UCR24293  Stipa cernua John C. Roos 1945-3-14 s.n. Los Angeles Los Angeles, Olympic Blvd., west of Fox Studios Comment
  CLARK-A1528-5266  Stipa comata John C. Roos, Alfred R. Roos 1953-8-8 5942 Inyo Inyo Mountains 2651 Comment
  UCR19288  Stipa coronata John C. Roos 1950-5-27 4817 Riverside Peninsular Range, Hills NE of summit of Reche Canyon 762 Comment
  UCR25382  Stipa coronata John C. Roos 1947-5-10 3613 Riverside Peninsular Range, Console Springs, north of Sunnymead 671 Comment
  UCR19293  Stipa elmeri John C. Roos 1946-9-4 2960 San Bernardino San Bernardino Mtns., San Gorgonio Ridge 3445 Comment
  LA102165  Stipa hymenoides John C. Roos; 1965-6-7 sn San Bernardino Victorville Comment
  CLARK-A1528-5586  Stipa lepida John C. Roos 1952-5-19 5691 Riverside Moreno Comment
  CLARK-A1528-5253  Stipa lettermanii John C. Roos 1946-8-25 2929 San Bernardino San Bernardino Mountains 2377 Comment
  UCR20452  Stipa lettermanii John C. Roos, L. Roos 1950-6-24 4842 San Bernardino San Bernardino Mtns, Moonridge, Bear Valley 2226 Comment
  CLARK-A1528-5270  Stipa speciosa John C. Roos 1952-4-9 5495 Riverside Mount Rubidoux 365 Comment
  CLARK-A1528-5295  Stipa speciosa John C. Roos 1938-4-18 8722 Inyo Death Valley National Park Comment
  CLARK-A1528-5552  Stipa speciosa John C. Roos 1937-7-14 Riverside Reche Canyon Comment
  UCR24303  Stipa speciosa John C. Roos 1942-3-7 1003 Los Angeles San Gabriel Mtns., Big Tujunga Canyon 457 Comment
  UCR25606  Stipa thurberiana John C. Roos 1951-8-8 5087 Inyo White Mtns, 3 mi NW of Cedar Flat 2591 Comment
  UCR23432  Streptanthus cordatus John C. Roos 1955-6-17 6399 Inyo Northern Mojave Desert, 2 mi. NE of Willow Spring, Last Chance Mtns. 1835 Comment
  CLARK-A1528-2346  Streptanthus cordatus John C. Roos 1947-7-11 2841 Inyo Panamint Mountains 2499 Comment
  GH422039  Streptanthus cordatus J. C. Roos & L. Roos 1952-7-27 5835 Unknown S.E. rim Reed Flat, Whtie Mts. 3139 Comment
  UCR19210  Stylomecon heterophylla John C. Roos 1973-4-14 s.n. San Bernardino San Bernardino Valley, Loma Linda Hills Comment
  POM301519  Styrax redivivus J. C. Roos 1937-5-10 2326 Orange East of San Juan Capistrano. Comment
  UC1234808  Suaeda calceoliformis J. C. and A. R. Roos 1955-8-28 6565 Inyo 3 mi n Olancha (w side of Owens Lake); Owens Lake 1082 Comment
  UCR24327  Suaeda moquinii John C. Roos 1937-7-4 1770 Santa Barbara Upper Cuyama Valley Comment
  CAS-BOT-BC221899  Swallenia alexandrae John C. Roos 1955-5-13 6365 Inyo West side Eureka Valley at mouth of Marble Canyon 1036 Comment
  GH341023  Swallenia alexandrae J. C. Roos 1955-5-13 6352 Unknown southeast end Eureka Valley. 944 Comment
  UCSB40904  Swallenia alexandrae John C. Roos and Lucille Roos 1954-6-28 6175 Inyo collected in the N-slope of sand dune at SE-end of the Eureka Valley Eureka Valley 929 Comment
  UCSB49608  Swallenia alexandrae John C. Roos and Lucille Roos 1954-6-28 6175 Inyo collected in the N-slope of sand dune at SE-end of the Eureka Valley Eureka Valley 929 Comment
  POM263484  Swertia perennis J. C. Roos 1937-8-8 527 Inyo Lone Pine Canyon. 2744 Comment
  UCD136700  Symphyotrichum subulatum var. parviflorum J. C. Roos 1949-10-1 4680 Orange Doheney Beach. 3 Comment
  UCR24125  Tanacetum camphoratum John C. Roos 1950-7-19 4857 San Francisco San Francisco Bay Region, San Francisco, Santiago St. and 22nd Ave. 61 Comment
  CLARK-A1528-1457  Tauschia parishii John C. Roos 1937-5-28 San Bernardino San Bernardino Mountains Comment
  UCR26202  Tetracoccus hallii John C. Roos, Lucille Roos 1949-4-9 4212 San Bernardino Mojave / Sonoran (Colorado) Desert, east of the road junction [Vidal Junction], 6 mi. north of Vidal 284 Comment
  RSA48172  Tetradymia argyraea J. C. Roos, Weatherby 1949-9-2 3572 San Bernardino Summit of Kingston Peak 2232 Comment
  RSA48174  Tetradymia argyraea J. C. Roos 1949-6-25 3560 San Bernardino Clark Mountains: Coliseum Mine 1616 Comment
  RSA48175  Tetradymia argyraea J. C. Roos 1949-5-29 4376 San Bernardino Clark Mountains: Coliseum Mine Comment
  UC1010295  Tetradymia argyraea J. C. Roos 1950-9-2 4965 San Bernardino 1 mi se Coliseum Mine; Mojave Desert, Clark Mts. 1615 Comment
  UC809590  Tetradymia argyraea J. C. Roos and R. Weatherby 1949-9-2 3573 San Bernardino ne of Kingston Pk.; Kingston Mts. 2133 Comment
  CLARK-A1528-2118  Tetradymia canescens John C. Roos 1937-7-15 385 San Bernardino San Gabriel Mountains 1737 Comment
  POM261189  Tetradymia canescens J. C. Roos 1941-8-17 56 Inyo Panamint Mountains: 3048 Comment
  UCR19189  Tetradymia canescens John C. Roos 1965-8-9 s.n. Inyo Sierra Nevada Mountains, Independence Creek [near Onion Valley] 2683 Comment
  CLARK-A1528-2123  Tetradymia comosa John C. Roos 1965-6-27 San Bernardino Loma Linda Hills 304 Comment
  POM266373  Tetradymia comosa J. C. Roos 1940-6-24 1587 San Bernardino South of Loma Linda. 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
  RSA662546  Tetradymia glabrata J. C. Roos 1969-5-10 s.n. Kern Red Rock Canyon Comment
  UC1234819  Tetradymia glabrata J. C. Roos 1955-6-21 6469 Inyo 1.5 mi sw Loretto mine (along Loretto road, e slope Inyo Mountains); Inyo MOuntains 1676 Comment
  UCR18588  Tetradymia spinosa var. longispina John C. Roos 1965-5-20 s.n. San Bernardino Mojave Desert, Hesperia Comment
  CLARK-A1528-1381  Tetragonia tetragonioides John C. Roos 1951-9-25 5288 Riverside Riverside 259 Comment
  UCR23431  Thelypodium integrifolium John C. Roos 1946-9-21 3046 San Bernardino N slope San Bernardino Mtns/S Mojave Desert, Box 'S' Springs 1082 Comment
Read comments
Jul 5 2014
  UCR25787  Thysanocarpus curvipes John C. Roos 1952-4-16 5544 Riverside Reche Canyon. 457 Comment
  UCR18803  Thysanocarpus laciniatus John C. Roos 1948-5-8 3818 Riverside San Bernardino Mtns, Whitewater 579 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
  UCR18796  Tiquilia nuttallii John C. Roos 1937-8-6 1961 Inyo Sierra Nevada Mtns, Big Pine Comment
  RSA92336  Tiquilia plicata J. C. Roos 1954-6-28 6181 Inyo North base of sand dunes at SE end of Eureka Valley 915 Comment
  CAS-BOT-BC377027  Townsendia scapigera John Roos; Lucille Roos 1951-8-9 5120 Inyo Reed Flat and 1 mile south of Reed Flat, White Mts. 3048 Comment
  RSA79484  Townsendia scapigera J. C. Roos, A. R. Roos 1953-8-13 6010 Inyo Head of Tamarack Canyon, Inyo Mountains. 3140 Comment
  UC1023402  Townsendia scapigera J. C. and A. R. Roos 1953-8-13 6010 Inyo Head of Tamarack Canyon Inyo Mts. 3139 Comment
  CAS-BOT-BC377029  Townsendia scapigera J. C. Roos 1955-6-19 6436 Inyo East ridge one mile south of Willow Spring, Last Chance Mountains 2286 Comment
  CLARK-A1528-1417  Toxicodendron diversilobum John C. Roos 1952-4-28 5589 Riverside Riverside Comment
  CAS-BOT-BC438298  Trianthema portulacastrum J. C. Roos 1965-9-5 s.n. Riverside 18 miles W. of Blythe. Comment
  UCR19709  Trianthema portulacastrum John C. Roos 1954-11-21 6256 San Bernardino San Bernardino Valley, Loma Linda 336 Comment
  UCR24156  Trichocoronis wrightii John C. Roos 1937-6-7 2505 Riverside San Jacinto River Valley, S base of Jackrabbit Trail, San Jacinto Valley Comment
  UCR18810  Trichoptilium incisum John C. Roos 1966-3-20 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mtns, rocky canyon 2.5 miles SE of Desert Center 610 Comment
  CLARK-A1528-3134  Trichostema parishii John C. Roos 1937-5-31 752 San Bernardino Cajon Canyon Comment
  CLARK-A1528-5280  Tridens muticus John C. Roos 1949-5-29 3536 San Bernardino Clark Mountain 1737 Comment
  CLARK-A1528-5281  Tridens muticus John C. Roos 1949-5-29 3535 San Bernardino Clark Mountain 1402 Comment
  UCR24378  Tridens muticus John C. Roos 1966-11-12 s.n. Riverside Sonoran (Colorado) Desert, Chuckwalla Mtns, Spring Tank 457 Comment
  RSA662538  Trifolium amplectens J. C. Roos 1966-3-24 s.n. Riverside Flats west of Hemet. Comment
  UCSB45553  Trifolium depauperatum var. amplectens Roos, John 1966-3-24 Riverside Flats west of Hemet Comment
  UCR23847  Trifolium dubium Alfred R. Roos 1954-5-29 s.n. Los Angeles Hollywood Comment
  CLARK-A1528-2880  Trifolium gracilentum John C. Roos 1950-4-1 4720 Los Angeles Comment
  POM263331  Trifolium repens J. C. Roos 1937-7-18 402 Los Angeles Near Currys Camp Baldy, San Antonio Canyon. Between Los Angeles and San Bernardino County. Comment
  UCR18630  Trifolium truncatum John C. Roos 1952-4-2 5458 Riverside Edgemont 488 Comment
  CLARK-A1528-2882  Trifolium wormskioldii John C. Roos 1950-8-12 4933 San Bernardino San Bernardino Mountains 2194 Comment
  UCSB42197  Trifolium wormskioldii Roos, John 1965-6-26 San Bernardino Santa Ana River Canyon, Heart Bar area, San Bernardino Mtns. Comment
  CLARK-A1528-2881  Trifolium wormskioldii John C. Roos 1952-5-20 5699 San Bernardino San Bernardino 304 Comment
  POM301610  Triodanis biflora J. C. Roos 1937-6-8 1498 San Diego Warner Hot Springs. Comment
  CLARK-A1528-5306  Trisetum canescens John C. Roos 1940-8-17 1593 San Bernardino San Bernardino Mountains 2011 Comment
  CLARK-A1528-5576  Trisetum canescens John C. Roos 1941-8-2 86 Riverside San Jacinto Mountains 2133 Comment
  POM261188  Trisetum canescens J. C. Roos 1941-8-2 86 Riverside Dark Canyon. 2134 Comment
  CLARK-A1528-5294  Trisetum spicatum John C. Roos 1937-8-8 423 Inyo Lone Pine Canyon Comment
  UCR26329  Trisetum spicatum John C. Roos 1967-10-7 s.n. Inyo Big Pine Creek below Palisade Glacier 2896 Comment
  RSA78389  Triteleia ixioides subsp. scabra J. C. Roos 1951-5-27 5049 Mariposa 8 miles E of Mariposa. 1006 Comment
  UCR18634  Triteleia laxa John C. Roos 1950-7-22 4866 Sonoma Jenner 30 Comment
  UCSB45530  Triteleia laxa Roos, John; Roos, Lucille 1952-4-13 San Bernardino Hills south of Loma Linda, San Bernardino Valley 381 Comment
  CLARK-A1528-1069  Trixis californica John C. Roos 1937-6-10 1510 Imperial Mountain Springs 670 Comment
  CLARK-A1528-2356  Tropidocarpum gracile John C. Roos 1937-3-25 1335 Los Angeles Comment
  CLARK-A1528-3021  Turricula parryi John C. Roos 1946-8-27 2942 Riverside Santa Rosa Mountains 2194 Comment
  UCR23387  Vancouveria planipetala John C. Roos 1957-7-2 6647 Sonoma Miller Ridge Comment
  CLARK-A1528-2268  Vancouveria planipetala John C. Roos 1958-6-20 Mariposa Yosemite National Park Comment
  CLARK-A1528-4323  Verbascum thapsus John C. Roos 1937-7-25 2359 San Bernardino San Bernardino Mountains Comment
  POM301528  Verbascum thapsus J. C. Roos 1937-7-25 2359 San Bernardino Seven Oaks, San Bernardino Mountains. Comment
  UCR19141  Verbena scabra John C. Roos 1951-9-29 5307 San Bernardino San Bernardino Valley, Warm Creek near east San Bernardino 305 Comment
  UCR25396  Verbena scabra John C. Roos 1937-7-31 964 San Bernardino San Bernardino Valley, San Bernardino 305 Comment
  CLARK-A1528-1038  Veronica americana John C. Roos 1937-7-21 San Bernardino San Bernardino Mountains 1920 Comment
  RSA47429  Veronica americana J. C. Roos, L. Roos 1949-6-28 4525 San Bernardino Beck's Spring, Kingston Mts. Comment
  CLARK-A1528-4338  Veronica persica John C. Roos 1947-2-8 3231 San Bernardino San Bernardino County Hospital Comment
  CLARK-A1528-5153  Veronica persica John C. Roos 1947-3-21 3376 San Bernardino Loma Linda Comment
  UCR19523  Veronica persica John C. Roos 1950-6-3 4821 San Bernardino San Bernardino Valley, Loma Linda University campus, Loma Linda 323 Comment
  CLARK-A1528-1223  Veronica serpyllifolia John C. Roos 1943-7-4 San Bernardino San Bernardino Mountains 2438 Comment
  CLARK-A1528-2138  Viguiera deltoidea var. parishii John C. Roos 1946-11-30 3167 Riverside Chuckwalla Mountains Comment
  CLARK-A1528-2139  Viguiera deltoidea var. parishii John C. Roos 1946-9-14 3022 Riverside San Jacinto Mountains 1097 Comment
  UCR27517  Viola adunca John C. Roos 1937-6-5 931 San Bernardino San Bernardino Mtns., Crestline Comment
  CLARK-A1528-1316  Viola douglasii John C. Roos 1937-6-5 1475 San Bernardino San Bernardino Mountains 1523 Comment
  RSA444669  Viola purpurea subsp. purpurea J. C. Roos 1966-5-7 s.n. San Bernardino Barton Flats, San Bernardino Mts. Comment
  POM263284  Vulpia microstachys var. pauciflora J. C. Roos 1937-3-26 443 Kern Plains east of Maricopa. Comment
  RSA648673  Vulpia microstachys var. pauciflora J. C. Roos 1952-3-2 5464 Riverside Box Springs grade east of Riverside. 426 Comment
  CLARK-A1528-1501  Washingtonia filifera John C. Roos 1943-12-19 2762 Riverside Pushawalla Canyon Comment
  POM262895  Wislizenia refracta subsp. refracta J. C. Roos 1936-4-22 606 Riverside 10 miles E of Indio Comment
  UCR25097  Wyethia mollis John C. Roos 1948-9-7 4007 Tuolumne Sierra Nevada Mtns, Yosemite National Park, NE of Tuolumne Meadows 2744 Comment
  CLARK-A1528-5620  Wyethia ovata John C. Roos 1937-6-8 1488 San Diego Warner Springs Comment
  RSA79480  X Stiporyzopsis bloomeri J. C. Roos, L. Roos 1953-8-13 6014 Inyo Along crest of Inyo Mts. 3 miles east of Badger flat. 3171 Comment
  CLARK-A1528-5392  Xanthium strumarium var. canadense John C. Roos 1951-9-25 5279 Riverside Riverside 259 Comment
  UCR30575  Yucca baccata John C. Roos 1949-5-28 4329 San Bernardino Eastern Mojave Desert, wash near Green's Mine, north side Clark Mountain 1646 Comment
  UCR30451  Yucca brevifolia John C. Roos 1966-4-3 s.n. San Bernardino Mojave Desert, 6 mi south of Victorville Comment
  CLARK-A1528-1500  Yucca schidigera John C. Roos, Lucille Roos 1952-5-19 5686 Riverside San Timoteo Canyon 487 Comment
  CLARK-A1528-3310  Zauschneria cana John C. Roos 1936-10-13 1536 Los Angeles Arroyo Seco Comment
  CLARK-A1528-3311  Zauschneria cana John C. Roos 1946-11-23 3159 Los Angeles Placerita Canyon Comment
  CLARK-A1528-3202  Zigadenus brevibracteatus John C. Roos 1969-5-10 Kern Red Rock Canyon Comment
  UCR24151  Zigadenus brevibracteatus John C. Roos 1949-4-30 4276 San Bernardino Mojave Desert, 3 mi north of Hesperia Comment



  Copyright © 2019 Regents of the University of California — Updated 11 January 2019
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