Search Results — 205 specimen records retrieved (154 records with coordinates)
Results for search: County=IMPERIAL; Source=All; Collector=Peirson;   
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 Please cite data retrieved from this page: Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).
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? Specimen ID Determination * Collector Collection Date Collection Number County Locality Elevation in meters Feedback
  CAS-BOT-BC106603  Baileya pleniradiata F. W. Peirson 1932-3-21 9777 Imperial East edge Sand Hills 60 Comment
  CAS-BOT-BC162678  Chylismia claviformis subsp. peirsonii Frank W. Peirson 1922-4-13 2892 Imperial Mountain Springs Grade 457 Comment
  CAS-BOT-BC177744  Astragalus crotalariae Frank W. Peirson 1927-4-13 s.n. Imperial Imperial Valley Boulevard, opposite Salton Sea Comment
  CAS-BOT-BC178631  Astragalus coccineus Frank W. Peirson 1922-4-13 2877 Imperial Mountain Springs, below store. 792 Comment
  CAS-BOT-BC179025  Chorizanthe brevicornu var. brevicornu Frank W. Peirson 1922-4-12 4213 Imperial 28 miles S of Coachella, Colorado Desert Comment
  CAS-BOT-BC200990  Calliandra eriophylla Frank W. Peirson 1932-3-21 9788 Imperial 6 miles north of Ogilby and northward, eastern Imperial County 167 Comment
  CAS-BOT-BC229619  Mirabilis tenuiloba Frank W. Peirson 1941-4-8 13075 Imperial Painted Gorge, Road to gorge turns N from boulevard a few miles E of Mountains Springs Grade Comment
  CAS-BOT-BC263467  Eriogonum thomasii F. W. Peirson 1922-4-13 2874 Imperial Foot of Mountain Springs Grade Comment
  CAS-BOT-BC371667  Phacelia pauciflora Frank W. Peirson 1922-4-13 2862 Imperial Foot of Mt. Springs Grade Comment
  CAS-BOT-BC41678  Draba cuneifolia var. integrifolia Frank W. Peirson 1941-4-8 s.n. Imperial Painted Gorge. Road to gorge turns north from boulevard a few miles east of Mountain Springs Grade. Comment
  CAS-BOT-BC419589  Eschscholzia parishii Frank W. Peirson 1941-4-8 s.n. Imperial Painted Gorge. The road to gorge turns north from boulevard a few miles east of Mountain Springs Grade Comment
  CAS-BOT-BC81867  Ephedra trifurca Frank W. Peirson 1932-3-21 9774 Imperial Sand Hills along the Holtville-Yuma Road 76 Comment
  JEPS15014  Loeseliastrum schottii Frank W. Peirson 1927-4-16 7218 Imperial foot of Mountain Springs Grade Comment
  JEPS54743  Astragalus magdalenae var. peirsonii Frank W. Peirson 1932-3-21 9776 Imperial sand hills w Yuma; w of Yuma Comment
  PASA1572  Porophyllum gracile Frank W. Peirson 1922-4-13 Imperial Foot of Mountain Springs Grade Comment
  PASA1991  Cryptantha nevadensis Frank W. Peirson 1922-4-13 Imperial Foot of Mountain Springs Grade Comment
  PASA2161  Brickellia atractyloides var. odontolepis Frank W. Peirson 1922-4-13 Imperial Mountain Springs Grade 548 Comment
  PASA24  Plantago Frank W. Peirson 1932-3-22 Imperial Midway Well, East Imperial Co. 152 Comment
  PASA671  Erodium texanum Frank W. Peirson 1922-4-12 Imperial 28 miles southeast of Coachella, about sea level Comment
  PASA821  Lupinus concinnus var. agardhianus Frank W. Peirson 1922-4-13 Imperial Mountain Springs Grade 365 Comment
  PASA954  Senecio mohavensis Frank W. Peirson 1922-4-13 Imperial Moutain Springs Grade 365 Comment
  POM11149  Cheilanthes viscida F. W. Peirson 1922-4-13 s.n. Imperial Mountain Springs, western edge of Colorado Desert 792 Comment
  POM128743  Polygonum argyrocoleon F. W. Peirson 1927-4-13 7179 Imperial Imperial Valley Blvd., opposite Salton Sea. Comment
  POM128745  Ephedra trifurca F. W. Peirson 1927-4-15 7193 Imperial Sand dunes west of Yuma. Comment
  POM128747  Populus fremontii F. W. Peirson 1927-4-15 7203 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  POM128748  Machaeranthera asteroides F. W. Peirson 1927-4-15 7206 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  POM128762  Atriplex elegans var. fasciculata F. W. Peirson 1927-4-16 7202 Imperial A couple of miles below foot of Mountain Springs grade Comment
  POM212927  Petalonyx linearis F. W. Peirson 1935-4-16 11460 Imperial North of the bridge over the canal at Laguna Dam Comment
  RSA0006612  Camissonia claviformis subsp. peirsonii F. W. Peirson 1922-4-12 4512 Imperial Twenty-eight miles south [SE] of Coachella -56 Comment
  RSA399168  Oligomeris linifolia F. W. Peirson 1922-4-12 s.n. Imperial 28 miles south of Coachella. Comment
Read comments
Jul 27 2007
  RSA415438  Astragalus coccineus F. W. Peirson 1922-4-13 2877 Imperial Mountain Springs, western edge of Colorado Desert 792 Comment
  RSA428267  Phacelia minutiflora F. W. Peirson 1935-4-16 11465 Imperial 4-S Pass, eastern Imperial County. Comment
  RSA466515  Cistanthe ambigua F. W. Peirson 1935-4-15 11458 Imperial 4 miles north of Laguna Dam. Comment
  RSA499212  Chamaesyce pediculifera F. W. Peirson 1932-4-22 9796 Imperial Midway Well 152 Comment
  RSA64622  Eriogonum thomasii F. W. Peirson, W. L. Jepson 1928-4-22 7881 Imperial Foot of rocky walls of the Narrows, San Felipe Creek. Comment
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Aug 22 2014
  RSA64702  Eriogonum thomasii F. W. Peirson 1922-4-23 2874 Imperial Foot of Mtn Springs Grade Comment
  RSA65102  Eriogonum deserticola F. W. Peirson 1939-11-25 s.n. Imperial On San Felipe Rd. about 3 miles from the Boulevard. Comment
  RSA65131  Eriogonum deserticola F. W. Peirson 1927-11-26 7679 Imperial Along Blvd. about half way down the Salton Sea. Comment
  RSA65132  Eriogonum deserticola F. W. Peirson 1927-4-15 7195 Imperial Sand dunes west of Yuma. Comment
  RSA65191  Chorizanthe corrugata F. W. Peirson 1932-3-22 9795 Imperial Midway Well. 152 Comment
  RSA65199  Chorizanthe brevicornu var. brevicornu F. W. Peirson 1922-4-12 4213 Imperial 28 miles south of Coachella. Comment
  RSA65349  Atriplex elegans var. fasciculata F. W. Peirson 1927-4-26 7207 Imperial 2 miles below foot of Mtn Springs Grade Comment
  RSA65389  Atriplex hymenelytra F. W. Peirson 1922-4-12 2354 Imperial 28 miles south of Coachella. Comment
  RSA65636  Achyronychia cooperi F. W. Peirson 1935-4-15 11459 Imperial North of Laguna Dam. Comment
  RSA65742  Sesuvium verrucosum F. W. Peirson 1927-4-15 7204 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  RSA65743  Sesuvium verrucosum F. W. Peirson 1918-04 1856 Imperial Salton Sea. Comment
Read comments
Nov 18 2014
  RSA67368  Guillenia lasiophylla F. W. Peirson 1932-3-22 9801 Imperial Midway Well 152 Comment
  RSA68982  Plantago ovata var. fastigiata F. W. Peirson 1922-4-12 2867 Imperial 30 miles south of Coachella. Colorado desert. Comment
Read comments
Oct 8 2011
  RSA68984  Plantago ovata var. fastigiata F. W. Peirson 1932-3-22 9799 Imperial Midway Well. 152 Comment
  RSA68985  Plantago ovata var. fastigiata F. W. Peirson 1932-3-21 9769 Imperial 6 miles east of Holtville. 0 Comment
  RSA69458  Mirabilis tenuiloba F. W. Peirson 1941-4-8 13075 Imperial Small, rocky side canyon of Painted Gorge, ca. 10 miles E of Mt. Springs Grade and N of El Centro to San Diego Blvd. Comment
  RSA69471  Mirabilis laevis var. retrorsa F. W. Peirson 1927-4-14 7180 Imperial Canyon near east end of Santa Rosa Mountains, 8 miles from Imperial Valley Boulevard. Comment
  RSA69541  Mentzelia involucrata F. W. Peirson 1941-4-8 s.n. Imperial Painted Gorge north of the San Diego to El Centro hwy. Comment
  RSA69555  Mentzelia hirsutissima var. stenophylla F. W. Peirson 1927-4-16 7209 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA69583  Mentzelia involucrata F. W. Peirson 1932-3-22 9800 Imperial Midway Well 152 Comment
  RSA69681  Allenrolfea occidentalis F. W. Peirson 1918-03 1840 Imperial Ranch at northern end of Salton Sea. Comment
Read comments
Feb 20 2013
  RSA69685  Mentzelia affinis F. W. Peirson 1932-3-21 9791 Imperial 10 miles N of Ogilby, Eastern Imperial County Comment
  RSA69969  Abronia villosa var. villosa F. W. Peirson 1927-4-15 7205 Imperial near Colorado River, Ft. Yuma Comment
  RSA69990  Allionia incarnata F. W. Peirson 1932-3-22 9808 Imperial Desert Mts N of Midway Well 610 Comment
  RSA70341  Asclepias albicans F. W. Peirson 1927-4-16 7213 Imperial Foot of Mountain Springs Grade, Western Imperial County. Comment
  RSA70348  Funastrum hirtellum F. W. Peirson 1928-4-22 7879 Imperial Foot of rocky walls of the Narrows, San Felipe Creek. [San Diego Co.] Comment
Read comments
Aug 22 2014
  RSA70352  Funastrum cynanchoides var. hartwegii F. W. Peirson 1932-3-21 9793 Imperial Desert 10 mi. N of Ogilby. 152 Comment
  RSA70379  Chamaesyce pediculifera F. W. Peirson 1932-3-22 9796 Imperial Midway Well 152 Comment
  RSA70389  Euphorbia polycarpa var. hirtella F. W. Peirson 1922-4-12 4258 Imperial 28 miles south of Coachella. Comment
  RSA70497  Erodium texanum F. W. Peirson 1922-4-12 2886 Imperial 28 miles southeast of Coachella. Comment
  RSA70543  Euphorbia eriantha F. W. Peirson 1932-3-22 9797 Imperial Midway Well. 152 Comment
  RSA71803  Gilia stellata F. W. Peirson 1927-4-16 7217 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA71804  Gilia stellata F. W. Peirson 1932-3-22 9803 Imperial Midway Well. 152 Comment
  RSA72239  Camissonia claviformis subsp. yumae F. W. Peirson 1932-3-21 9768 Imperial 6 miles east of Holtville. 0 Comment
  RSA72240  Camissonia claviformis subsp. peirsonii F. W. Peirson 1928-4-22 7880 Imperial Foot of rocky walls of the Narrows, San Felipe Creek. Comment
Read comments
Aug 22 2014
  RSA72241  Camissonia claviformis subsp. peirsonii F. W. Peirson 1927-4-14 7181 Imperial Canyon near east end of Santa Rosa Mountains, 8 miles from Imperial Valley Boulevard. Comment
  RSA72242  Camissonia claviformis subsp. peirsonii F. W. Peirson 1922-4-13 2892 Imperial Mountain Spring Grade. 457 Comment
  RSA74498  Phacelia minutiflora F. W. Peirson 1935-4-16 11465 Imperial 4-S Pass, eastern Imperial County. Comment
  RSA74511  Phacelia neglecta F. W. Peirson 1941-4-8 s.n. Imperial 10 miles NW of Ogilby. Comment
  RSA74514  Phacelia pachyphylla F. W. Peirson 1941-4-8 13072 Imperial Painted Gorge north of the San Diego to El Centro hwy. Comment
  RSA74710  Nama hispida var. revoluta F. W. Peirson 1941-4-8 s.n. Imperial 10 miles NW of Ogilby. Comment
  RSA74712  Nama demissa var. deserti F. W. Peirson 1932-3-22 9806 Imperial Midway Well. 152 Comment
  RSA74717  Nama hispida var. spathulata F. W. Peirson 1932-3-21 9780 Imperial The east edge of the Sand Hills east of Holtville 61 Comment
  RSA74718  Nama hispida var. revoluta F. W. Peirson 1927-4-15 7199 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  RSA74839  Phacelia ivesiana var. pediculoides F. W. Peirson 1922-4-12 2856 Imperial 2 miles E of Coyote Well, on El Centro to San Diego road. Comment
  RSA75130  Nemacladus glanduliferus var. orientalis F. W. Peirson 1932-3-22 9798 Imperial Midway Well. 152 Comment
  RSA75148  Nemacladus glanduliferus F. W. Peirson 1927-4-16 7219 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA75389  Camissonia cardiophylla F. W. Peirson 1935-4-16 11461 Imperial North of bridge of canal at Laguna Dam [AZ], north of Yuma. Comment
  RSA75394  Camissonia chamaenerioides F. W. Peirson 1922-4-13 2898 Imperial Mountain Spring Grade. 457 Comment
  RSA75402  Camissonia boothii subsp. condensata F. W. Peirson 1927-4-14 7183 Imperial Along canyon banks near east end of Santa Rosa Mountains, 8 miles from boulevard to Imperial Valley. 305 Comment
  RSA75406  Oenothera deltoides subsp. deltoides F. W. Peirson 1932-3-21 9778 Imperial E edge of sand hills, Holtsville -Yuma Road 61 Comment
  RSA75417  Oenothera deltoides subsp. deltoides F. W. Peirson 1932-3-21 9771 Imperial 8 miles east of Holtsville 15 Comment
  RSA75420  Oenothera deltoides subsp. deltoides F. W. Peirson 1922-4-12 2905 Imperial 45 miles southeast of Coachella Comment
  RSA75421  Oenothera deltoides subsp. deltoides F. W. Peirson 1927-4-15 7192 Imperial 10 miles east of Holtsville Comment
  RSA75434  Camissonia pallida subsp. pallida F. W. Peirson 1922-4-13 2879 Imperial Mountain Spring Grade. 457 Comment
  RSA75685  Camissonia refracta F. W. Peirson 1932-3-22 9807 Imperial Midway Well. 152 Comment
  RSA76970  Condalia globosa var. pubescens F. W. Peirson 1932-3-21 9794 Imperial 24 miles north of Ogibly 183 Comment
  RSA77042  Sphaeralcea ambigua subsp. rosacea F. W. Peirson 1941-4-8 13074 Imperial upper part of Painted Gorge, N of El Centro to San Diego Boulevard and bout 10 mi E of foot of Mountain Springs Grade Comment
  RSA77045  Sphaeralcea orcuttii F. W. Peirson 1922-4-12 2893 Imperial along Imperial Valley Boulevard about opposite the southeast end of the Salton Sea Comment
  RSA77057  Loeseliastrum schottii F. W. Peirson 1927-4-16 7218 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA77072  Langloisia setosissima subsp. setosissima F. W. Peirson 1922-4-12 4134 Imperial 30 miles south of Coachella. Comment
Read comments
Oct 8 2011
  RSA77416  Brandegea bigelovii F. W. Peirson 1932-3-21 9790 Imperial Desert 10 mi. N of Ogilby. 152 Comment
  RSA77425  Petalonyx linearis F. W. Peirson 1935-4-16 11460 Imperial North of bridge of canal at Laguna Dam [AZ], north of Yuma. Comment
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Feb 25 2008
  RSA77813  Pholisma sonorae Mabel Peirson 1932-3-21 9781 Imperial Holtville to Yuma Rd. 61 Comment
  RSA77841  Fagonia laevis F. W. Peirson 1932-3-21 9783 Imperial 3 mi. north of Ogilby. 122 Comment
  RSA77886  Tiquilia palmeri F. W. Peirson 1927-4-15 7202 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  RSA77891  Tiquilia plicata F. W. Peirson 1918-03 992 Imperial Salton Sea. Comment
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Nov 18 2014
  RSA77892  Tiquilia plicata F. W. Peirson 1927-4-15 7196 Imperial Sand dunes west of Yuma. Comment
  RSA79576  Cryptantha holoptera F. W. Peirson 1935-4-16 11466 Imperial North of the bridge over the canal at Laguna Dam Comment
  RSA79885  Datura discolor F. W. Peirson 1922-4-13 2897 Imperial Foot of Mountain Springs Grade, w. Imperial County. Comment
  RSA80148  Mimulus bigelovii var. bigelovii F. W. Peirson 1927-4-16 7211 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA80249  Mohavea confertiflora F. W. Peirson 1932-3-22 9804 Imperial Midway Well 152 Comment
  RSA80274  Cryptantha maritima var. pilosa F. W. Peirson 1941-4-8 13073 Imperial Road to gorge turns N from boulevard a few miles E of Mtn Springs Grade Comment
  RSA80309  Lycium andersonii F. W. Peirson 1932-3-21 9784 Imperial 3 mi. north of Ogilby. 122 Comment
  RSA80686  Oligomeris linifolia F. W. Peirson 1922-4-12 1925 Imperial 15 miles south of Coachella. Comment
Read comments
Apr 1 2013
  RSA80730  Nicotiana obtusifolia F. W. Peirson 1935-4-16 11462 Imperial North of the bridge over the canal at Laguna Dam Comment
  RSA85056  Ephedra aspera F. W. Peirson 1922-4-13 5358 Imperial Mountain Springs, western edge of Colorado Desert 792 Comment
  RSA85172  Ephedra trifurca F. W. Peirson 1922-4-12 2866 Imperial Along Imperial Valley Boulevard near south end of Salton Sea. Comment
  RSA85175  Ephedra trifurca F. W. Peirson 1927-4-15 7193 Imperial Lower part of dunes west of Yuma. Comment
  RSA85176  Ephedra trifurca F. W. Peirson 1922-3-21 9774 Imperial Near summit of Sand Hills, east of Holtville. Comment
  RSA85178  Ephedra trifurca F. W. Peirson 1941-4-9 s.n. Imperial From Grays to Calexico. Comment
  RSA86720  Aristida adscensionis var. modesta F. W. Peirson 1936-4-16 11463 Imperial 4-S Pass northeast of Ogilby. Comment
  RSA86723  Aristida adscensionis F. W. Peirson 1932-3-21 9786 Imperial 3 mi. north of Ogilby. 122 Comment
  RSA86977  Calliandra eriophylla F. W. Peirson 1932-3-21 9788 Imperial 6 miles north of Ogilby, eastern Imperial Co. 137 Comment
  RSA86981  Calliandra eriophylla F. W. Peirson 1935-4-16 s.n. Imperial North of Ogilby Comment
  RSA87090  Lupinus brevior F. W. Peirson 1922-4-13 5226 Imperial Mountain Springs Grade on road from El Centro to San Diego. 366 Comment
  RSA87134  Leptochloa fusca subsp. uninervia F. W. Peirson 1918-03 1562 Imperial Ranch at northern end of Salton Sea. Comment
Read comments
Jan 7 2014
  RSA87308  Lupinus agardhianus F. W. Peirson 1927-4-16 7214 Imperial Foot of Mountain Springs Grade, Western Imperial County. Comment
  RSA87368  Muhlenbergia microsperma F. W. Peirson 1932-3-22 9805 Imperial Midway Well. 152 Comment
  RSA91825  Cenchrus echinatus F. W. Peirson 1922-4-12 2913 Imperial Twenty-eight miles south [SE] of Coachella -56 Comment
  SBBG29147  Polygonum argyrocoleon F. W. Peirson, W. L. Jepson 1927-4-13 7179 Imperial Imperial Valley Blvd, opposite ca. central part of Salton Sea Comment
  SD87547  Gilia stellata Frank W. Peirson 1927-4-16 7217 Imperial Foot of Mountain Springs Grade. Comment
  SD87608  Astragalus palmeri F. W. Peirson 1922-4-13 2899 Imperial Mountain Springs Grade, western edge of the Colorado Desert 1064 Comment
  SD87634  Johnstonella holoptera Frank W. Peirson 1935-4-16 11466 Imperial Laguna Dam, in waste disturbed ground, north of the bridge over the canal. (IPB 10/07) Comment
  SD87742  Chaenactis stevioides Frank W. Peirson 1927-4-16 7208 Imperial 2.0 miles below foot of Mountain Springs Grade. Comment
  SD87782  Achyronychia cooperi Frank W. Peirson 1935-4-15 11459 Imperial 4 miles north of the Laguna Dam Comment
  SD87812  Tiquilia canescens var. pulchella Frank W. Peirson 1935-4-16 11464 Imperial 4-S Pass, eastern Imperial County, a few rods west of pass, in rough rocky terrain. (IPB 10/07) Comment
  SD87849  Palafoxia arida var. gigantea Frank W. Peirson 1927-4-15 7198 Imperial Sand Dunes west of Yuma Comment
  SD87868  Porophyllum gracile F. W. Peirson 1922-4-13 2882 Imperial Foot of Mountain Springs Grade Comment
  SD87880  Trichoptilium incisum Frank W. Peirson 1927-4-14 7189 Imperial Canyon near east end of Santa Rosa Mts; 8 miles from Imperial Valley Boulevard; Near Imperial-San Diego Cos. Line Comment
  SEINET6692574 Image available Eriogonum deserticola Frank W. Peirson 1927-11-26 7679 Imperial Open desert along boulevard about 1/2 way down the Salton Sea. Comment
  UC501437  Asclepias albicans Frank W. Peirson 1927-4-16 7213 Imperial foot Mountain Springs Grade Comment
  UC501441  Gilia stellata Frank W. Peirson 1932-3-22 9803 Imperial Midway Well Midway Well (eastern Imperial County) 152 Comment
  UC501478  Oenothera deltoides subsp. deltoides Frank W. Peirson 1932-3-21 9771 Imperial 8 mi e Holtville 15 Comment
  UC501479  Chylismia claviformis subsp. yumae Frank W. Peirson 1932-3-21 9768 Imperial 6 mi e Holtville (slightly above sea level) Comment
  UC501509  Ephedra trifurca Frank W. Peirson 1932-3-21 9774 Imperial se Imperial County The Sand Hills Comment
  UC570585  Phacelia crenulata var. minutiflora Frank W. Peirson 1935-4-16 11465 Imperial 4-S Pass Comment
  UC635305  Astragalus crotalariae Frank W. Peirson 1927-4-13 Imperial Imperial Valley Boulevard opposite Salton Sea; opposite Salton Sea Comment
  UC650709  Phacelia pachyphylla Frank W. Peirson 1941-4-8 13072 Imperial road to gorge turns n from Boulevard a few mi e of Mountain Springs Grade Painted Gorge Comment
  UC908900  Gilia stellata Frank W. Peirson 1932-3-22 9803 Imperial Midway Well Midway Well (eastern Imperial County) 152 Comment
  UC909108  Loeseliastrum schottii Frank W. Peirson 1927-4-16 7218 Imperial foot of Mountain Springs Grade (along n. bank of stream) Comment
  UCD65760  Dasyochloa pulchella F. W. Peirson 1922-4-13 4330 Imperial Foot of Mountain Springs Grade. Comment
  UCR129684  Camissonia chamaenerioides F. W. Peirson 1922-4-13 2898 Imperial Peninsular Range/Western Colorado Desert, Mountain Springs Grade 457 Comment
  UCR136635  Petalonyx linearis F. W. Peirson 1935-4-16 11460 Imperial Sonoran (Colorado) Desert, Laguna Dam, north of the bridge over the canal 49 Comment
  UCR136645  Lycium brevipes F. W. Peirson 1927-4-14 7190 Imperial Sonoran (Colorado) Desert, canyon near east end of the Santa Rosa Mountains and 7.5 mi from the Imperial Valley Boulevard 189 Comment
  UCR136649  Nicotiana obtusifolia F. W. Peirson 1935-4-16 11462 Imperial Sonoran (Colorado) Desert, Laguna Dam, north of the bridge over the canal 49 Comment
  UCR142721  Camissonia claviformis subsp. peirsonii F. W. Peirson 1922-4-12 4512 Imperial Sonoran (Colorado) Desert, Twenty-eight miles south [SE] of Coachella -56 Comment
  UCR142998  Ephedra trifurca F. W. Peirson 1922-4-12 2866 Imperial Sonoran/ Southern Colorado Desert, along Imperial Valley Boulevard near south end of Salton Sea -61 Comment
  UCR64595  Calandrinia ambigua F. W. Peirson 1935-4-15 11458 Imperial Sonoran (Colorado) Desert, in region of saguaro cactus north of Laguna Dam Comment
  RSA0003051  Astragalus peirsonii F. W. Peirson 1927-4-15 7194 Imperial Sand dunes west of Yuma. Comment
  RSA0006646  Camissonia claviformis subsp. peirsonii F. W. Peirson 1922-4-12 4512 Imperial 28 miles south of Coachella. Comment
  RSA0012626  Senecio mohavensis F. W. Peirson 1922-4-13 4247 Imperial Mountain Springs Grade on road from El Centro to San Diego. 366 Comment
  RSA0020069  Lycium brevipes var. hassei F. W. Peirson 1927-4-14 7190 Imperial Canyon near east end of Santa Rosa Mtns., 7.5 mi. from Imperial Valley Blvd. Comment
  RSA0059402  Orobanche cooperi subsp. cooperi Frank W. Peirson 1922-4-13 4064 Imperial Foot of Mountain Springs Grade, west edge of Colorado Desert. Comment
  RSA0059403  Orobanche cooperi subsp. cooperi F. W. Peirson 1932-3-21 9782 Imperial 9 miles west of Yuma. Comment
  RSA0103352  Tiquilia canescens var. pulchella F. W. Peirson 1935-4-16 11464 Imperial Four-S Pass, northeast of Ogilby. Comment
  RSA0108306  Cryptantha costata F. W. Peirson 1932-3-21 9773 Imperial 10 miles east of Holtville. 23 Comment
  RSA0121532  Apiastrum angustifolium F. W. Peirson 1927-4-16 7210 Imperial Foot of Mountain Springs Grade (road, San Diego to El Centro). Comment
  RSA0121651  Urtica urens F. W. Peirson 1922-4-13 4301 Imperial Mountain Spring Grade on road west from El Centro, western Imperial County. 457 Comment
  RSA0121659  Euphorbia albomarginata F. W. Peirson 1927-4-15 7200 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  RSA0121674  Lupinus succulentus F. W. Peirson 1918-03 2433 Imperial Ranch near Salton Sea. Comment
  RSA0126953  Mentzelia longiloba var. longiloba F. W. Peirson 1927-4-15 7201 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  RSA0126955  Mentzelia longiloba var. longiloba F. W. Peirson 1932-3-21 9779 Imperial E edge of sand hills, Holtsville -Yuma Road 61 Comment
  RSA90172  Astragalus lentiginosus var. borreganus F. W. Peirson 1932-3-21 9961 Imperial East edge of Sand Hill, east of Imperial Valley 60 Comment
  RSA90187  Astragalus coccineus F. W. Peirson 1922-4-13 2877 Imperial Mountain Springs, western edge of Colorado Desert 792 Comment
  RSA90379  Lotus tomentellus F. W. Peirson 1922-4-12 4082 Imperial 28 miles south of Coachella. Comment
  RSA90744  Astragalus magdalenae var. peirsonii F. W. Peirson 1927-4-15 7194 Imperial Lower part of dunes west of Yuma. Comment
  RSA90745  Astragalus magdalenae var. peirsonii F. W. Peirson 1932-3-21 9776 Imperial The east edge of the Sand Hills east of Holtville 60 Comment
  RSA90765  Astragalus crotalariae F. W. Peirson 1922-4-12 2904 Imperial 30 miles south of Coachella. Comment
Read comments
Oct 8 2011
  RSA91215  Krameria grayi F. W. Peirson 1927-4-16 7216 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA91217  Krameria grayi F. W. Peirson 1932-3-21 9785 Imperial 3 mi. north of Ogilby. 122 Comment
  RSA91373  Psorothamnus emoryi F. W. Peirson 1927-4-14 7186 Imperial Canyon near east end of Santa Rosa Mountains, 8 miles from Imperial Valley Boulevard. Comment
  RSA91428  Marina parryi F. W. Peirson 1932-3-22 9802 Imperial Midway Well 152 Comment
  RSA91437  Psorothamnus schottii F. W. Peirson 1927-4-16 7215 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA91541  Dasyochloa pulchella F. W. Peirson 1922-4-13 4330 Imperial Foot of Mountain Springs Grade, w. Imperial County. Comment
  RSA91980  Pleuraphis rigida F. W. Peirson 1932-3-21 9775 Imperial Sand Hills near their east edge, west of Yuma 61 Comment
  RSA92214  Palafoxia arida var. gigantea F. W. Peirson 1927-4-15 7198 Imperial Sand dunes west of Yuma. Comment
  RSA92215  Palafoxia arida var. arida F. W. Peirson 1932-3-21 9770 Imperial 6 miles east of Holtville. 0 Comment
  RSA92217  Pectis papposa F. W. Peirson 1939-11-25 s.n. Imperial San Filepe Road 6 or 8 miles above boulevard, probably west of Kane Spring. Comment
  RSA92218  Pectis papposa F. W. Peirson 1938-11-12 92218 Imperial Along boilevard to Imperial Valley directly opposite the road to Mecca. 0 Comment
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Feb 20 2013
  RSA92224  Porophyllum gracile F. W. Peirson 1922-4-13 2882 Imperial Foot of Mountain Springs Grade, w. Imperial County. Comment
  RSA92486  Helianthus niveus subsp. tephrodes F. W. Peirson 1927-4-15 7197 Imperial Sand dunes west of Yuma. Comment
  RSA92875  Baileya pauciradiata F. W. Peirson 1918-03 1367 Imperial Salton Sea. Comment
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Nov 18 2014
  RSA92876  Baileya pauciradiata F. W. Peirson 1932-3-21 9772 Imperial 10 miles east of Holtville. 23 Comment
  RSA92884  Populus fremontii F. W. Peirson 1927-4-15 7203 Imperial Near Ft. Yuma. Comment
  RSA93326  Xylorhiza orcuttii F. W. Peirson 1927-4-14 7191 Imperial Canyon near east end of Santa Rosa Mountains, 8 miles from Imperial Valley Boulevard. Comment
  RSA93353  Dieteria asteroides F. W. Peirson 1927-4-15 7206 Imperial Low land along Colorado River, near Ft. Yuma. Comment
  RSA93717  Brickellia arguta var. odontolepis F. W. Peirson 1922-4-13 2881 Imperial Mountain Springs Grade, road from El Centro to San Diego, W Imperial Co. 549 Comment
  RSA93760  Baileya pleniradiata F. W. Peirson 1932-3-21 9777 Imperial The east edge of the Sand Hills east of Holtville 60 Comment
  RSA93764  Geraea canescens F. W. Peirson 1922-4-12 4239 Imperial 28 miles south of Coachella. Comment
  RSA93813  Chaenactis stevioides var. stevioides F. W. Peirson 1935-4-16 11467 Imperial Midway Well eastern Colorado Desert Comment
  RSA93864  Encelia frutescens F. W. Peirson 1922-4-12 2875 Imperial 2 miles E of Coyote Well, on El Centro to San Diego road. Comment
  RSA93894  Encelia farinosa var. farinosa F. W. Peirson 1932-3-21 9792 Imperial Desert 10 mi. N of Ogilby. 152 Comment
  RSA93951  Hymenoclea salsola F. W. Peirson 1932-3-21 9789 Imperial Desert 10 mi. N of Ogilby. 152 Comment
  RSA94403  Chaenactis stevioides var. stevioides F. W. Peirson 1927-4-16 7208 Imperial A couple of miles below foot of Mountain Springs grade Comment
  RSA94616  Trichoptilium incisum F. W. Peirson 1927-4-14 7189 Imperial Canyon near east end of Santa Rosa Mountains, 8 miles from Imperial Valley Boulevard. Comment
  RSA94832  Trixis californica F. W. Peirson 1927-4-16 7212 Imperial Foot of Mountain Springs Grade, Western Imperial County Comment
  RSA95058  Rafinesquia neomexicana F. W. Peirson 1922-4-13 2910 Imperial Mountain Springs, western Imperial County on El Centro to San Diego highway. 793 Comment
  RSA95298  Hibiscus denudatus F. W. Peirson 1932-3-21 9789 Imperial 3 mi. north of Ogilby. 122 Comment
  RSA991825  Cenchrus echinatus F. W. Peirson 1922-4-12 2913 Imperial 28 miles south of Coachella. Comment



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