Fig. 1. Photograph of Palm Canyon, 16 November 2010

Flora of Palm, Andreas, Murray and Tahquitz Canyons below 3000 Feet Elevation, San Jacinto Mountains

Fig. 2. Photograph of Tahquitz Falls, 16 November 2010

Table of Contents



Procedure For Compiling The Checklist

Important Caveats


Taxa Rejected From The Checklist

Fig. 3. Photograph of Tahquitz Falls, 6 April 2011


The Indian Canyons west of Palm Springs have always been a magnet for botanists, as well as tourists. Samuel Parish collected the first voucher in 1881, in Andreas Canyon, of a rare hybrid between Cheilanthes parryi and C. covillei, called C. X parishii in his honor. Since then, over 100 different botanists have collected a total of 1,156 vouchers from this area.

The main attraction of this area is that it is a desert area with water - lots of water. The steep eastern face of the San Jacinto Mountains, with a drop of over 10,500 feet in elevation in only 7.2 miles linear distance, from the 11,040 foot San Jacinto Peak to the 500 foot mouth of Tahquitz Canyon. There is essentially no place for this water to be used or absorbed by the plants or geology, and it all comes tumbling down to this area.

The resulting palm oases are a lure for desert denizens in the summer, offering shade as well as water. As can be seen from Fig. 1, Palm Canyon has a lot of palms.

But most interesting of all to botanists is that this is a fascinating transition between the vegetation of the coastal side of the mountains and the true desert to the east. It was almost mind-boggling to us to repeatedly come across coastal plants growing right next to desert plants.

This page is just a beginning of the flora of this area, since despite the large number of vouchers from this area, they all come from a very small portion of it. The two surveys we have done hardly even scratch the surface of the diversity here.

Yet even with the current incompleteness of the plant list here, this area is one of the more diverse areas for native plants in southern California, with 26% more species than is predicted from the best fit to the species - area relation for various places in southern California. This is a direct result of having abundant water, and by the mix of coastal, desert transition, and desert species.

There is much more work to be done on this flora, and much more fun to be had.

Unfortunately, the flora of this area also contains a brand-new-to-southern California, very-invasive annual grass that has taken over large areas on the open alluvial plain areas here, Stipa capensis, spear needlegrass (aka "cape needlegrass", "Mediterranean steppegrass", "twisted-awned speargrass", and "cape ricegrass"). This grass has even colonized areas along Tahquitz Creek. See Kate's 360° video panorama showing how extensively this grass has taken over here in places (click on the photo to begin the movie).

If you botanize here, make sure you remove all the seeds of this grass from your socks, shoes and pants before going elsewhere! Remember, the Coachella Valley is the same place that brought us the horrible scourge of Saharan Mustard, Brassica tournefortii. Don't help another invader spread!


The following map shows the location of the lower elevations of Palm, Andreas, Murray and Tahquitz Canyons, with georeferenced voucher locations marked with blue diamonds:

Fig. 4. Topographic map showing location of the lower elevations of Palm, Andreas, Murray and Tahquitz Canyons, with georeferenced voucher locations marked with blue diamonds.

Procedure For Compiling The Checklist

The Checklist was compiled by the first author from online vouchers; from field work done on 16 November 2010 by the first two authors; and from field work done on 6 April 2011 by all the authors.

Voucher Records

The vouchers were obtained from five separate searches of the Consortium of California Herbaria on 18 November 2010:

Duplicate vouchers were removed. The locality of each voucher was examined to rule out vouchers above 3000 feet elevation, vouchers that were out of this area, or vouchers from the urban area of Palm Springs.

Coordinates of the vouchers were then examined, and a few vouchers were removed that were outside this area.

The species list from the vouchers was then culled to remove species names that probably do not exist here, either because the location was not precise enough to be sure that the voucher was taken from the targeted area, or because the species determination on the voucher was unlikely to be correct. The rejected species are detailed below.

The online voucher determination of Gilia caruifolia was changed to G. stellata in the voucher list below, since that is the latest determination given on the voucher sheet. See Gilias of Lowermost Tahquitz Canyon.

Vouchers determined only to the species level were removed, and vouchers of a species and its subspecies were combined when there was only one plausible subspecies.

The above procedure resulted in a total of 349 taxa from 1,145 vouchers.

The dominant collectors, those with over 30 vouchers, are given in Table 1.

Table 1. Dominant Voucher Collectors

# Vouchers% of TotalName
17515%F. W. Peirson
16614%I. M. Johnston
12010%N. R. Zabriskie, W. M. Zabriskie
797%W. L. Jepson (most with H. M. Hall)
605%N. C. Cooper
514%A. C. Sanders (most with G. K. Helmkamp)
434%P. A. Munz
403%F. M. Reed
313%Mary F. Spencer

Field Surveys

Fig. 5. Topographic map showing locations of field surveys. The two trails in red were surveyed in detail on 6 April 2011; Tahquitz Canyon is the northernmost trail, with the southernmost trail from the mouth of Andreas Canyon to the mouth of Murray Canyon. The trail in yellow was part of an additional cursory survey on 16 November 2010 in Palm Canyon proper. See Fig. 4 for a map of a larger area containing these surveys.

The field work on 16 November 2010 by the first two authors was very cursory, and done primarily when hiking, not botanizing. Taxa were noted mostly from memory several days later. Due to the time of year, most of the noted taxa were shrubs. Nonetheless, a total of 71 taxa were noted, including 21 taxa that are not present in the voucher list.

The field work on 6 April 2011 was done by all the authors. A comprehensive survey was done from the southern end of the parking area at Andreas Canyon to the lowermost portion of Murray Canyon, followed by a more cursory survey of Tahquitz Canyon along the trail from the parking lot to the waterfall. Estimates of the plant abundances for the entire survey area were made only in the next several days after the trip, so the estimates are probably low for a number of species.

This survey found an amazing 171 taxa, including 37 taxa not present in the voucher list. Of those 37 taxa, 24 were species not seen in the 16 November 2010 survey, and were thus new additions to the Checklist.

Total Checklist

The total checklist below contains 396 taxa. Of those, 216 were present only from vouchers; 130 were present both in our surveys and in vouchers; and 50 species were only found in our surveys. The dominance of taxa found only in vouchers fits expectations since we have surveyed only a miniscule portion of the area covered by vouchers. However, finding that 27% of the taxa in our surveys were not on the voucher list was unexpected, since it had seemed to us, from the number of vouchers, that this area had been heavily botanized in the past.

Important Caveats

Please note the following important caveats about this preliminary Checklist:

Plant Checklist

The Checklist is sorted first by category - ferns, dicots, and monocots - and then by family and scientific name. The Family and Scientific Name are from the Jepson Manual. An asterisk before the Common Name would indicate a non-native taxon, but all of the taxa found so far here are native.

The column #Pls gives the minimum number of plants found in the 6 April 2011 survey of Tahquitz Canyon from the parking lot to the waterfall, and from the southern end of the parking area at Andreas Canyon to the lowermost portion of Murray Canyon. Many species are undoubtedly more abundant than are indicated by our minimum numbers, both due to our limitations in remembering how many plants of each species we saw for sure, and because surveys at other times of year might find more plants. The maximum number of plants estimated is 99.

A "~" in front of the number indicates that the taxon was not fully identified, usually due to lack of flowers, and hence our determination may not be correct. For Adiantum capillus-veneris, the uncertainty is because the plants are inaccessible on the rock cliffs of Tahquitz Waterfall, and were only seen from a distance.

Additional species seen in Tahquitz Canyon on 16 November 2010 are marked with a T in this column. Additional taxa noted on 16 November 2010 in Palm Canyon immediately above the Trading Post, and at the mouth of Andreas Canyon, that are not on the voucher checklist, are marked with an X in this column.

The third column (#V) gives the number of vouchers for this entire area for each taxon.

See also the list of rejected species given below.

This is a working list, about which we make no guarantees at all until we officially release it. Use at your own risk!

Version for printing, without lines and other text on this page: html (12 pages) or pdf Clickbook booklet (3 double-sided pages). (See printing instructions for an explanation of these options)

#JM FamilyScientific Name(*)Common Name#Pls#V
1BlechnaceaeWoodwardia fimbriatagiant chain fern 3
2EquisetaceaeEquisetum laevigatumsmooth scouring rush 2
3PteridaceaeAdiantum capillus-venerismaidenhair fern~58
4PteridaceaeCheilanthes covilleibeady lipfern 9
5PteridaceaeCheilanthes covillei X C. parryiteensy lipfern 2
6PteridaceaeCheilanthes parryiwoolly lipfern3027
7PteridaceaeCheilanthes viscidasticky lipfern 9
8PteridaceaeNotholaena californicaCalifornia cloak fern3016
9PteridaceaePellaea andromedifoliacoffee fern 4
10PteridaceaePellaea mucronata var. mucronatabird's-foot fern 5
11PteridaceaePentagramma triangularis ssp. maxoniiMaxon's silverback fern109
12SelaginellaceaeSelaginella bigeloviiBigelow's spike-moss17
13SelaginellaceaeSelaginella eremophiladesert spike-moss313
14ThelypteridaceaeThelypteris puberula var. sonorensisSonoran maiden fern 2
15CupressaceaeJuniperus californicaCalifornia juniper 4
16EphedraceaeEphedra asperaMormon tea~54
17EphedraceaeEphedra californicadesert tea2 
18EphedraceaeEphedra nevadensisNevada ephedra 1
19EphedraceaeEphedra viridisgreen ephedra 1
20AcanthaceaeJusticia californicachuparosa9911
21AceraceaeAcer macrophyllumbigleaf maple 1
22AnacardiaceaeRhus lancea*African Sumac 5
23AnacardiaceaeRhus ovatasugar bush 2
24ApiaceaeDaucus pusillusrattlesnake weed 1
25ApiaceaeTauschia argutasouthern tauschia 1
26AsclepiadaceaeSarcostemma cynanchoides ssp. hartwegiiclimbing milkweed306
27AsclepiadaceaeSarcostemma hirtellumrambling milkweed 3
28AsteraceaeAcamptopappus sphaerocephalus var. sphaerocephalusgoldenhead 3
29AsteraceaeAdenophyllum porophylloidesSan Felipe dogweed105
30AsteraceaeAmbrosia dumosaburroweed508
31AsteraceaeAmbrosia psilostachyawestern ragweed201
32AsteraceaeAnthemis cotula*dog-fennel 1
33AsteraceaeArtemisia californicaCalifornia sagebrush 2
34AsteraceaeArtemisia ludoviciana ssp. albulawhite mugwort 1
35AsteraceaeArtemisia ludoviciana ssp. incomptamountain mugwort2 
36AsteraceaeAster pauciflorusmarsh alkali aster 1
37AsteraceaeBaccharis salicifoliamule fatT6
38AsteraceaeBaccharis sergiloidesdesert baccharis302
39AsteraceaeBaileya pauciradiataColorado Desert marigold 1
40AsteraceaeBebbia juncea var. asperasweetbush306
41AsteraceaeBrickellia argutaCalifornia spear-leaved brickellia 1
42AsteraceaeBrickellia californicaCalifornia brickellbush 1
43AsteraceaeBrickellia desertorumdesert brickellia 3
44AsteraceaeCentaurea melitensis*tocalote 1
45AsteraceaeChaenactis carphoclinia var. carphocliniapebble pincushion 1
46AsteraceaeChaenactis fremontiiFremont pincushion995
47AsteraceaeConyza canadensishorseweed~5 
48AsteraceaeEncelia farinosabrittlebush997
49AsteraceaeEricameria linearifolianarrowleaf goldenbush 1
50AsteraceaeErigeron divergensspreading fleabane 1
51AsteraceaeEriophyllum ambiguum var. paleaceumannual woolly sunflower 6
52AsteraceaeFilago arizonicaArizona herba impia 1
53AsteraceaeFilago californicaCalifornia filago504
54AsteraceaeGnaphalium bicolorbicolored everlasting102
55AsteraceaeGnaphalium californicumCalifornia everlasting 1
56AsteraceaeGnaphalium luteo-album*common cudweed11
57AsteraceaeGutierrezia californicaCalifornia matchweed14
58AsteraceaeGutierrezia sarothraematchweed 3
59AsteraceaeHelianthus annuusannual sunflower~20 
60AsteraceaeHelianthus niveus ssp. canescensgray desert sunflower 1
61AsteraceaeHymenoclea monogyraleafy burrobrush 1
62AsteraceaeHymenoclea salsola var. salsolacheesebush408
63AsteraceaeIsocoma acradenia var. eremophilasolitary-leaved alkali goldenbush102
64AsteraceaeLactuca serriola*prickly lettuceT 
65AsteraceaeLasthenia californicagoldfields 1
66AsteraceaeLasthenia microglossasmall-rayed goldfields 1
67AsteraceaeLepidospartum squamatumscale-broom 1
68AsteraceaeMalacothrix glabratadesert dandelion53
69AsteraceaeMalacothrix stebbinsiiStebbins' malacothrix 1
70AsteraceaeMonoptilon bellioidesdesert star 6
71AsteraceaePalafoxia arida var. aridadesert needle 4
72AsteraceaePerityle emoryiEmory's rock-daisy9910
73AsteraceaePeucephyllum schottiipygmy-cedar 5
74AsteraceaePleurocoronis plurisetaarrow-leaf1010
75AsteraceaePluchea sericeaarrow-weed56
76AsteraceaePorophyllum gracileodora 1
77AsteraceaePulicaria paludosa*Spanish false-fleabaneT1
78AsteraceaeRafinesquia californicaCalifornia chicory101
79AsteraceaeRafinesquia neomexicanadesert chicory101
80AsteraceaeSenecio mohavensisMojave ragwort 1
81AsteraceaeSolidago californicagoldenrod20 
82AsteraceaeSonchus oleraceus*sow thistle5 
83AsteraceaeStephanomeria pauciflora var. pauciflorawire-lettuce54
84AsteraceaeStylocline gnaphaloideseverlasting nest-straw991
85AsteraceaeStylocline psilocarphoidesPeck's stylocline101
86AsteraceaeTrichoptilium incisumyellow-head 5
87AsteraceaeTrixis californica var. californicaCalifornia trixis1014
88AsteraceaeUropappus lindleyisilver puffs51
89AsteraceaeViguiera parishiiParish's viguiera1011
90AsteraceaeXanthium strumariumcocklebur20 
91BetulaceaeAlnus rhombifoliawhite alder 5
92BignoniaceaeChilopsis linearis ssp. arcuatadesert-willow19
93BoraginaceaeAmsinckia menziesii var. intermediacommon fiddleneck992
94BoraginaceaeAmsinckia tessellata var. tessellatabristly fiddleneck 3
95BoraginaceaeCryptantha angustifolianarrow-leaved cryptantha991
96BoraginaceaeCryptantha barbigerabearded cryptantha209
97BoraginaceaeCryptantha barbigera var. fergusoniaeSanta Rosa Mountain bearded cryptantha 1
98BoraginaceaeCryptantha costataribbed cryptantha 1
99BoraginaceaeCryptantha decipiensgravel cryptantha10 
100BoraginaceaeCryptantha intermediapopcorn flower991
101BoraginaceaeCryptantha maritimaGuadalupe cryptantha 2
102BoraginaceaeCryptantha racemosabushy cryptantha 3
103BoraginaceaeCryptantha utahensisscented cryptantha304
104BoraginaceaePectocarya heterocarpachuckwalla pectocarya 1
105BoraginaceaePectocarya penicillatacombseed101
106BoraginaceaePectocarya platycarpabroad-fruited combseed 1
107BoraginaceaePectocarya recurvatacurvenut combseed304
108BoraginaceaeTiquilia palmeriPalmer's coldenia 1
109BrassicaceaeArabis perennansperennial rock-cress 2
110BrassicaceaeArabis pulchrabeautiful rock-cress 1
111BrassicaceaeAthysanus pusillusdwarf athysanus5 
112BrassicaceaeBrassica tournefortii*Asian mustard20 
113BrassicaceaeCaulanthus cooperiCooper's jewel-flower 1
114BrassicaceaeDescurainia pinnata ssp. glabrasmooth western tansy-mustard21
115BrassicaceaeHutchinsia procumbensprostrate hutchinsia 2
116BrassicaceaeLepidium lasiocarpum var. lasiocarpumhairy-podded pepper-grass503
117BrassicaceaeRorippa nasturtium-aquaticumwater cress50 
118BrassicaceaeSisymbrium irio*London rocket50 
119BrassicaceaeSisymbrium orientale*Oriental mustard20 
120BrassicaceaeThysanocarpus curvipesfringe-pod205
121BrassicaceaeThysanocarpus laciniatuslace-pod 1
122BrassicaceaeTropidocarpum gracileslender tropidocarpum 1
123CactaceaeEchinocereus engelmanniiEngelmann's hedgehog cactus3 
124CactaceaeFerocactus cylindraceusCalifornia barrel cactus51
125CactaceaeMammillaria tetrancistrafish-hook cactus12
126CactaceaeOpuntia basilaris var. basilarisbeavertail cactus2 
127CactaceaeOpuntia bigeloviiteddy-bear chollaX 
128CactaceaeOpuntia echinocarpasilver chollaX 
129CactaceaeOpuntia ganderiGander's cholla10 
130CampanulaceaeLobelia cardinalis var. pseudosplendenscardinal flower 2
131CampanulaceaeNemacladus glanduliferusglandular nemacladus 2
132CampanulaceaeNemacladus glanduliferus var. orientaliseastern glandular nemacladus 1
133CampanulaceaeNemacladus tenuis var. tenuisdesert threadplant 2
134CapparaceaeIsomeris arboreabladderpod 5
135CaryophyllaceaeCerastium glomeratum*mouse-ear chickweed 2
136CaryophyllaceaeHerniaria hirsuta ssp. cinerea*grey herniaria 2
137CaryophyllaceaeLoeflingia squarrosa var. squarrosaspreading loeflingia 1
138CaryophyllaceaeSagina apetala*dwarf pearlwort 3
139CaryophyllaceaeSagina decumbens ssp. occidentaliswestern pearlwort 1
140CaryophyllaceaeSilene antirrhinasnapdragon campion 3
141CaryophyllaceaeStellaria pallida*pale starwort 2
142ChenopodiaceaeAtriplex canescens ssp. linearisnarrow-leaf four-wing saltbush~25
143ChenopodiaceaeAtriplex lentiformis ssp. lentiformisbig saltbushX 
144ChenopodiaceaeChenopodium atrovirensforest goosefoot 1
145ChenopodiaceaeChenopodium murale*nettle-leaved goosefoot10 
146ChenopodiaceaeSalsola tragus*Russian thistle 1
147CrassulaceaeCrassula connatapygmy-weed993
148CrassulaceaeDudleya saxosa ssp. aloidesdesert dudleya 2
149CrossosomataceaeCrossosoma bigeloviirock crossosoma 7
150CucurbitaceaeCucurbita palmatacoyote melon 1
151CucurbitaceaeMarah macrocarpus var. macrocarpuswild-cucumber12
152CuscutaceaeCuscuta californicaCalifornia dodder 2
153DatiscaceaeDatisca glomerataDurango root 3
154EuphorbiaceaeChamaesyce arizonicaArizona spurge 1
155EuphorbiaceaeChamaesyce polycarpasmall-seeded spurge5010
156EuphorbiaceaeChamaesyce setilobastarfish (Yuma) spurge 1
157EuphorbiaceaeCroton californicusCalifornia croton 6
158EuphorbiaceaeDitaxis lanceolatanarrowleaf ditaxis302
159EuphorbiaceaeDitaxis neomexicanaNew Mexico ditaxis 3
160EuphorbiaceaeEuphorbia erianthabeetle spurge 2
161EuphorbiaceaeStillingia linearifolialinear-leaved stillingia 1
162FabaceaeAcacia greggiicatclaw306
163FabaceaeAmorpha californica var. californicaCalifornia false-indigo 1
164FabaceaeAmorpha fruticosawestern false-indigo52
165FabaceaeAstragalus coccineusscarlet milk-vetch 1
166FabaceaeAstragalus douglasii var. parishiiParish' Jacumba milk-vetch 2
167FabaceaeAstragalus lentiginosusfreckled milk-vetch 1
168FabaceaeAstragalus nuttallianussmall-flowered milk-vetch 2
169FabaceaeAstragalus nuttallianus var. cedrosensisCedros milk-vetch32
170FabaceaeAstragalus nuttallianus var. imperfectusturkey-peas 1
171FabaceaeAstragalus palmeriPalmer's milk-vetch 2
172FabaceaeAstragalus pomonensisPomona locoweed 1
173FabaceaeCaesalpinia virgatawand holdback 1
174FabaceaeCercidium floridum ssp. floridumblue palo verde101
175FabaceaeLotus argophyllus var. argophyllussouthern California silver-lotus 6
176FabaceaeLotus hamatusSan Diego birdsfoot lotus302
177FabaceaeLotus heermannii var. heermanniisilky lotus 3
178FabaceaeLotus oblongifolius var. oblongifoliusstreambank lotus 2
179FabaceaeLotus purshianus var. purshianusSpanish clover~20 
180FabaceaeLotus rigidusdesert lotus 12
181FabaceaeLotus salsuginosus var. brevivexillusshort-bannered coastal lotus11
182FabaceaeLotus scoparius var. brevialatusshort-winged deerweed102
183FabaceaeLotus strigosusstrigose lotus22
184FabaceaeLupinus arizonicusArizona lupine 5
185FabaceaeLupinus concinnusbajada lupine202
186FabaceaeLupinus sparsiflorusCoulter's lupine 1
187FabaceaeLupinus truncatuscollar lupine 1
188FabaceaeMelilotus indicus*sourclover50 
189FabaceaeProsopis glandulosa var. torreyanahoney mesquite306
190FabaceaeProsopis pubescensscrew-bean mesquite 3
191FabaceaePsorothamnus arborescens var. simplicifoliusCalifornia indigo-bush 2
192FabaceaePsorothamnus emoryiEmory's indigo-bush 2
193FabaceaePsorothamnus schottiiindigo bush102
194FabaceaePsorothamnus spinosussmoke tree 1
195FabaceaeTrifolium microcephalumsmall-head field clover 1
196FabaceaeTrifolium variegatumvariegated clover 2
197FagaceaeQuercus agrifoliacoast live oak 1
198FagaceaeQuercus wislizeni var. frutescensinterior live oak1 
199GentianaceaeCentaurium exaltatumdesert centaury 1
200GentianaceaeCentaurium venustumcanchalagua 2
201GentianaceaeEustoma exaltatumcatchfly prairie-gentian 2
202GeraniaceaeErodium cicutarium*redstem filaree50 
203GeraniaceaeErodium texanumTexas filaree 1
204GeraniaceaeGeranium carolinianumCarolina geranium101
205GrossulariaceaeRibes indecorumwhite-flowering currant1 
206HydrophyllaceaeEmmenanthe penduliflora var. penduliflorawhispering bells305
207HydrophyllaceaeEriodictyon crassifolium var. crassifoliumthick-leaved yerba santa208
208HydrophyllaceaeEucrypta chrysanthemifolia var. bipinnatifidaeucrypta403
209HydrophyllaceaeEucrypta micranthadesert eucrypta 1
210HydrophyllaceaeNama demissum var. demissumpurple mat 2
211HydrophyllaceaeNemophila menziesiibaby blue eyes 1
212HydrophyllaceaePhacelia campanulariadesert bluebells 1
213HydrophyllaceaePhacelia cicutaria var. hispidacaterpillar phacelia502
214HydrophyllaceaePhacelia crenulata var. ambiguaheliotrope phacelia 2
215HydrophyllaceaePhacelia cryptanthalimestone phacelia 1
216HydrophyllaceaePhacelia distanscommon phacelia995
217HydrophyllaceaePhacelia minorwild canterbury bells403
218HydrophyllaceaePhacelia pedicellatapedicellate phacelia 1
219HydrophyllaceaePhacelia ramosissima var. latifoliabranching phacelia 1
220HydrophyllaceaePholistoma membranaceumwhite fiesta flower9912
221HydrophyllaceaeTurricula parryipoodle-dog bush 1
222KrameriaceaeKrameria erectaPima rhatany 2
223KrameriaceaeKrameria grayiwhite rhatany107
224LamiaceaeHyptis emoryidesert-lavender2015
225LamiaceaeSalazaria mexicanaMexican bladder sage 5
226LamiaceaeSalvia apianawhite sage102
227LamiaceaeSalvia columbariaechia2 
228LamiaceaeSalvia vaseyiVasey's sage 2
229LamiaceaeStachys ajugoides var. rigidarigid hedge-nettle~10 
230LamiaceaeStachys strictaSonoma hedge-nettle 1
231LamiaceaeTrichostema parishiiParish's bluecurls 1
232LoasaceaeMentzelia involucratabracted blazing star53
233LoasaceaePetalonyx thurberi ssp. thurberiThurber's sandpaper-plant 5
234LythraceaeLythrum californicumCalifornia loosestrife 1
235MalvaceaeEremalche exiliswhite mallow 4
236MalvaceaeHibiscus denudatusrock hibiscus28
237MalvaceaeMalacothamnus densiflorusyellow-stem bush mallow 1
238MalvaceaeSphaeralcea ambiguaapricot mallow 3
239MalvaceaeSphaeralcea ambigua var. ambiguaapricot mallow508
240MalvaceaeSphaeralcea ambigua var. rosacearosy apricot mallow 10
241MalvaceaeSphaeralcea ambigua var. rugosadesert globemallow 1
242NyctaginaceaeAbronia villosa var. auritahairy sand verbena 1
243NyctaginaceaeAllionia incarnatatrailing four o'clock 8
244NyctaginaceaeBoerhavia coccineascarlet spiderling15
245NyctaginaceaeMirabilis bigelovii var. bigeloviiBigelow's desert four-o'clock 3
246NyctaginaceaeMirabilis bigelovii var. retrorsaBigelow's desert four-o'clock104
247NyctaginaceaeMirabilis multiflora var. pubescensgiant four o'clock 1
248NyctaginaceaeMirabilis tenuilobaslender-lobed four o'clock253
249OleaceaeForestiera pubescensdesert olive 1
250OnagraceaeCamissonia boothii ssp. condensataBooth's evening primrose 2
251OnagraceaeCamissonia californicaCalifornia suncup51
252OnagraceaeCamissonia cardiophylla ssp. cardiophyllaheartleaf sun-cup23
253OnagraceaeCamissonia chamaenerioideslong-fruit suncup 2
254OnagraceaeCamissonia claviformis ssp. aurantiacabrown-eyed primrose102
255OnagraceaeCamissonia pallida ssp. pallidapale sun-cup506
256OnagraceaeCamissonia strigulosastrigose sun-cup 1
257OnagraceaeClarkia epilobioidescanyon clarkia 1
258OnagraceaeEpilobium canum ssp. latifoliummountain California-fuchsia303
259OnagraceaeGayophytum heterozygumzig-zag gayophytum 1
260OnagraceaeOenothera elata ssp. hirsutissimaHooker's evening-primrose5 
261OrobanchaceaeOrobanche fasciculataclustered broom-rape 1
262PapaveraceaeArgemone munitaprickly poppy 1
263PapaveraceaeEschscholzia caespitosatufted eschscholzia 1
264PapaveraceaeEschscholzia minutiflora ssp. minutiflorasmall-flowered poppy102
265PapaveraceaeEschscholzia parishiiParish's poppy 6
266PlantaginaceaePlantago ovatadesert plantain103
267PlantaginaceaePlantago patagonicaPatagonia plantain 3
268PlatanaceaePlatanus racemosawestern sycamore57
269PolemoniaceaeEriastrum diffusumminiature woolly-star 3
270PolemoniaceaeEriastrum eremicum ssp. eremicumdesert woolly-star 1
271PolemoniaceaeGilia angelensisangel's gilia404
272PolemoniaceaeGilia australissouthern gilia205
273PolemoniaceaeGilia latifoliabroad-leaf gilia 1
274PolemoniaceaeGilia stellatastar gilia24
275PolemoniaceaeLangloisia setosissima ssp. setosissimabristly langloisia 1
276PolemoniaceaeLinanthus jonesiiJones' linanthus 1
277PolemoniaceaeLoeseliastrum schottiiSchott's calico 1
278PolygonaceaeChorizanthe brevicornu var. brevicornubrittle spineflower102
279PolygonaceaeEriogonum elongatum var. elongatumlong-stemmed buckwheat5 
280PolygonaceaeEriogonum fasciculatum var. polifoliumCalifornia buckwheat56
281PolygonaceaeEriogonum inflatumdesert trumpet104
282PolygonaceaeEriogonum thurberiThurber's buckwheat 1
283PolygonaceaeEriogonum trichopeslittle desert trumpet 1
284PolygonaceaeEriogonum wrightii var. nodosumWright's buckwheat28
285PolygonaceaePterostegia drymarioidesthreadstem20 
286PortulacaceaeCalyptridium monandrumsand cress 1
287PortulacaceaeClaytonia parviflora ssp. parvifloranarrow-leaved miner's lettuce12
288PrimulaceaeAnagallis arvensis*scarlet pimpernel1 
289RanunculaceaeClematis paucifloravirgin's bower11
290RanunculaceaeDelphinium parishii ssp. parishiiParish's larkspur1014
291RanunculaceaeRanunculus cymbalaria var. saximontanusRocky Mountain buttercup 1
292RhamnaceaeZiziphus parryi var. parryilotebush19
293RosaceaePrunus fasciculatadesert almond 1
294RosaceaePrunus fremontiidesert apricot1018
295RubiaceaeGalium angustifolium ssp. angustifoliumnarrowleaf bedstraw31
296RubiaceaeGalium angustifolium ssp. gracillimumslender bedstraw 1
297RubiaceaeGalium aparinecommon bedstraw20 
298RubiaceaeGalium stellatum var. eremicumstar-flowered bedstraw 6
299SalicaceaePopulus fremontii ssp. fremontiiFremont cottonwood23
300SalicaceaeSalix exiguanarrowleaf willow53
301SalicaceaeSalix gooddingiiblack willow13
302SalicaceaeSalix laevigatared willow 2
303SaxifragaceaeJepsonia parryicoast jepsonia 1
304ScrophulariaceaeAntirrhinum filipesdesert twining snapdragon 4
305ScrophulariaceaeCastilleja foliolosawoolly Indian paintbrush 2
306ScrophulariaceaeCastilleja minor ssp. spiralislesser paintbrush101
307ScrophulariaceaeKeckiella antirrhinoides var. microphyllalittle-leaved chaparral beard-tongue 1
308ScrophulariaceaeMimulus bigelovii var. bigeloviiBigelow's monkeyflower 2
309ScrophulariaceaeMimulus guttatuscommon monkeyflower754
310ScrophulariaceaeMimulus parishiiParish's monkeyflower 1
311ScrophulariaceaeMimulus pilosusfalse monkeyflower 1
312ScrophulariaceaeMohavea confertifloraghost flower 1
313ScrophulariaceaePenstemon clevelandii var. connatusSan Jacinto beardtongue 4
314ScrophulariaceaeStemodia durantifoliawhite-woolly stemodia 11
315ScrophulariaceaeVeronica anagallis-aquatica*water speedwell 1
316ScrophulariaceaeVeronica arvensis*corn speedwell 1
317SimmondsiaceaeSimmondsia chinensisjojoba16
318SolanaceaeDatura wrightiisacred datura3 
319SolanaceaeLycium andersoniiAnderson's desert-thorn206
320SolanaceaeLycium brevipes var. brevipesdesert-thorn 1
321SolanaceaeLycium torreyiTorrey's box-thorn 2
322SolanaceaeNicotiana attenuatacoyote tobacco 1
323SolanaceaeNicotiana obtusifoliadesert tobacco1012
324SolanaceaePhysalis crassifoliathick-leaved ground cherry15
325SolanaceaeSolanum douglasiiwhite nightshade14
326SterculiaceaeAyenia compactaayenia 6
327TamaricaceaeTamarix aphylla*athel 1
328TamaricaceaeTamarix ramosissima*saltcedar 1
329UrticaceaeParietaria hespera var. hesperapellitory506
330UrticaceaeParietaria pensylvanicaPennsylvania pellitory 2
331ViscaceaePhoradendron californicumdesert mistletoe308
332VitaceaeVitis girdianawild grape994
333ZygophyllaceaeFagonia laevisCalifornia fagonia 4
334ZygophyllaceaeLarrea tridentatacreosote bush508
335ArecaceaeWashingtonia filiferaCalifornia fan palm651
336CyperaceaeCarex almasturdy sedge 2
337CyperaceaeCyperus involucratus*umbrella plant108
338CyperaceaeCyperus squarrosusbearded flatsedge 1
339CyperaceaeEleocharis geniculatabent spikerush 6
340CyperaceaeEleocharis parishiiParish's spikerush 9
341CyperaceaeScirpus americanusAmerican tule 6
342JuncaceaeJuncus acutus ssp. leopoldiispiny rush 4
343JuncaceaeJuncus bufoniustoad rush 1
344JuncaceaeJuncus mexicanusMexican rushX 
345JuncaceaeJuncus rugulosuswrinkled rush 1
346JuncaceaeJuncus xiphioidesiris-leaved rush13
347LemnaceaeLemna minutaduckweed 1
348LiliaceaeAgave desertidesert agave 1
349LiliaceaeAllium marviniiYucaipa onion 1
350LiliaceaeDichelostemma capitatum ssp. capitatumblue dicks309
351LiliaceaeNolina parryiParry's nolina3 
352LiliaceaeYucca schidigeraMohave yuccaT5
353LiliaceaeYucca whippleichaparral yuccaT 
354OrchidaceaeEpipactis giganteastream orchid 15
355PoaceaeAchnatherum coronatumgiant needlegrass 1
356PoaceaeAchnatherum speciosumdesert needlegrass 2
357PoaceaeAcrachne racemosa*goosegrass 1
358PoaceaeAgrostis exarataspike bentgrass 1
359PoaceaeAgrostis viridis*green bentgrass 1
360PoaceaeAndropogon glomeratus var. scabriglumissouthwestern bushy bluestem 4
361PoaceaeAristida adscensionissix-weeks three-awn105
362PoaceaeAristida purpureapurple three-awn10 
363PoaceaeAristida purpurea var. nealleyiNealley three-awn 3
364PoaceaeAristida purpurea var. parishiiParish three-awn 1
365PoaceaeAvena barbata*slender wild oats20 
366PoaceaeBothriochloa barbinodiscane bluestem 3
367PoaceaeBromus carinatus var. carinatusCalifornia brome401
368PoaceaeBromus diandrus*ripgut brome991
369PoaceaeBromus hordeaceus*soft chess151
370PoaceaeBromus madritensis ssp. rubens*red brome995
371PoaceaeBromus tectorum*downy brome30 
372PoaceaeBromus trinii*Chilean chess 5
373PoaceaeCenchrus longispinus*mat sandbur 1
374PoaceaeCynodon dactylon*Bermuda grass102
375PoaceaeDactyloctenium aegyptium*crows-foot grass 3
376PoaceaeDistichlis spicatasaltgrass10 
377PoaceaeErioneuron pulchellumfluff grass 2
378PoaceaeHordeum murinum*foxtail barley99 
379PoaceaeHordeum murinum ssp. glaucum*foxtail barley 1
380PoaceaeImperata brevifoliasatintail 1
381PoaceaeMelica frutescenstall melica 2
382PoaceaeMuhlenbergia microspermalittleseed muhly103
383PoaceaeMuhlenbergia rigensdeergrass10 
384PoaceaeNassella lepidafoothill needlegrass3 
385PoaceaePennisetum setaceum*fountain grass99 
386PoaceaePleuraphis rigidabig galleta505
387PoaceaePoa bigeloviiBigelow's blue grass 6
388PoaceaePoa secunda ssp. secundaone-sided bluegrass104
389PoaceaePolypogon monspeliensis*rabbits-foot grass10 
390PoaceaeSchismus barbatus*Mediterranean schismus991
391PoaceaeStipa capensis*spear needlegrass99 
392PoaceaeVulpia bromoides*brome fescue~301
393PoaceaeVulpia myuros*rattail fescue 2
394PoaceaeVulpia myuros var. hirsuta*hairy rattail fescue 1
395PoaceaeVulpia octoflorasix-weeks fescue 4
396TyphaceaeTypha latifoliabroadleaf cattail 1

Taxa Rejected From The Checklist

Taxa Rejected Due To Uncertain Locations

The taxon name is linked to the online voucher record.

The following three species are higher-elevation taxa, from collections made by Jepson on a trip from Vandeventer Flat to Palm Canyon and back, and were probably collected in Palm Canyon above 3000 feet elevation, or from a Peirson trip along the Gordon Trail from Andreas Canyon to Mt. San Jacinto:

Taxa Rejected Due To Probably-Incorrect Determinations

Yucca baccata, JEPS46498. This voucher was determined in 1901, and its determination has apparently not been revisited since then. It is almost surely not Yucca baccata, which is only found in the eastern desert mountains near the Colorado River. This is probably Y. schidigera.

Amsinckia spectabilis, UC306211. This voucher is actually the type specimen for A. divaricata. The correct synonymy for this species is probably A. tessellatta, or perhaps A. menziesii var. intermedia, since A. spectabilis is an immediate-coastal species.

Cirsium neomexicanum, UC61517. This voucher is almost surely not Cirsium neomexicanum, which is only found in the eastern desert mountains.

Allium haematochiton, UCR133190. This voucher was collected at San Jacinto Mtns. canyon above Palm Springs, which is not near other populations of Allium haematochiton, which is a coastal taxon. Perhaps this is actually A. marvinii, or perhaps the voucher was taken at an elevation higher than 3000 feet.

Voucher data provided by the participants of the Consortium of California Herbaria (

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Copyright © 2010-2011 by Tom Chester, Robert Hepburn, James Dillane, Kate Harper, Dave Stith and Pam Pallette.
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Last update: 12 April 2011