Flora of Mountain Springs Grade area, Imperial / San Diego County

Fig. 1. Google Earth View of the upper part of the Mountain Springs Grade area. The bottom of the Grade is on the desert floor near Ocotillo, CA. Click on the picture for a larger version showing more area.

Voucher Summary
Checklist Summary


Mountain Springs Grade is a visually-stunning area where the mountains in the southeast corner of San Diego County abruptly descend to the desert floor in Imperial County. The descent is so steep that the two traffic directions of Interstate 8 are routed down two separate canyons as the freeway descends 4000 feet in 11 miles. Probably because of the steep slopes, with low rainfall that often comes in large quantities from thunderstorms, the area features what has been called a magnificent arrangement of huge boulders. The boulders appear quite naked, with little plant life evident. See photographs at the following links: US 80 Photo Gallery; Mountain Springs History; and Off-Road Trip to Mountain Spring.

But plant life there is, and it is fascinating!

There are a number of plant species found here that are not found in the rest of Anza Borrego Desert State Park, or San Diego County, some of which are the northernmost locations of species found in Baja California such as Deinandra floribunda, Hulsea mexicana, Ipomopsis tenuifolia and Linanthus bellus.

There are also a number of interesting plant species that are supposedly vouchered from here, but which apparently are actually not found here, since no one else has ever seen them here, and they appear to be very out of range from the rest of their distribution. Examples are Cryptantha similis, Cynoglossum grande, Lepidium fremontii, Salvia dorrii var. pilosa, Scutellaria mexicana, Syntrichopappus fremontii, and Xylorhiza tortifolia. At least one other interesting species is mentioned as being in this area in Beauchamp's 1986 Flora of San Diego County, such as Herissantia crispa, but there are no vouchers of this species from here.

I had always wanted to work in the field on a flora of this area to try to figure out what species are actually here, and what species are not. However, as I was compiling vouchers for this area, it soon became apparent that nearly all of the curious plant species are from a single collector, Charles Russell Orcutt, from what appears to be a single collection event in April 1917. See below for more information about the Orcutt vouchers.

Field observations have been made by three groups of people:

Voucher Summary

Vouchers were searched on 13 and 14 November 2014 at Consortium of California Herbaria. A geographic coordinate search, for vouchers with coordinates, was made for the region of 32.65 to 32.70° north latitude and -116.13 to -116.06° east longitude. The search was augmented by a separate locality search for "Mountain Spring" for vouchers without coordinates from San Diego or Imperial County. I later found 12 additional vouchers from this area that had coordinates but had been georeferenced just outside this area.

The localities of all vouchers were reviewed, and ones with localities that were clearly outside this area were tossed.

After compiling the list of species from vouchers, I sorted that list by the number of observations in my database, and began to examine the species that I had either never seen, or had just a few records of in my database. For each of those species, I checked the geographic distribution given in the Jepson Manual second edition, and that given by maps of voucher locations. When I found species that seemed unlikely to actually be here, I checked the voucher record that placed them here.

In this analysis, it soon became apparent that nearly all of the curious plant species are from a single collector, Charles Russell Orcutt, from what appears to be a single collection event in April 1917. I then examined the total geographic range in vouchers for every species from his set of ~62 vouchers, and quickly realized that most of the Orcutt vouchers were not actually from the Mountain Springs area.

The problem is that in April 1917 Orcutt clearly collected vouchers from a very large area, probably from the Mojave Desert to Mountain Springs Grade to the coast of San Diego County, and called the entire collection his Mountain Springs Collection. Most of those vouchers have no further locality information, perhaps because Orcutt was primarily interested in collecting living and fossil animal shells at that time, and/or perhaps because Orcutt was said to be a librarian's nightmare, somewhat careless in his work, and careless in his collecting methods.

It flouts common sense that vouchers from the Mountain Springs Collection would not actually be from the Mountain Springs area, but that appears to be the case.

For example, the voucher label for this specimen has the typed information of Mountain Springs Grade; Orcutt Collection, but a hand-written locality of near Sweetwater River, Jacumba. The Sweetwater River is 33 miles west of Mountain Spring, and Jacumba is six miles southwest of Mountain Spring as well as six miles west of the head of Mountain Spring Grade as measured along the current route of I-8.

And this is one of his better localities! Off all 721 vouchers collected by Orcutt that are in the Consortium of California Herbaria, 65% do not even have a collection number assigned; 20% have a locality of just San Diego; 15% have a locality of just Colorado Desert or sw Colorado Desert; 10% do not even have a COUNTY assigned; and 10% have no locality information at all.

His specimen numbering appears to have started anew with his April 1917 Mountain Springs Grade collection trip, with those online vouchers numbered from 155 to 307, after his collection number had reached 2555 in 1890. There are few online collections from him between 1890 and 1917.

Of the vouchers collected in 1917 in the Mountain Springs Grade collection, at least 15 of the species are coastal or montane San Diego County species whose eastern limit is reached at a significant distance to the west of the actual location of Mountain Springs Grade. Two of those species, Pseudognaphalium ramosissimum and Ceanothus verrucosus, are found only very near the coast of San Diego County, 40 to 50 miles west of Mountain Springs Grade. An additional 11 of the species from this set have Mountain Spring significantly out of their actual range. One of those species, Cryptantha similis, is endemic to an area on the north side of the San Gabriel and San Bernardino Mountains. Another species, Cynoglossum grande, is not even found in southern California. His voucher has a note in it Found in this group possibly out of range, indicating that he possibly had accidentally included a voucher from another trip with this collection.

Since the Orcutt locality of Mountain Springs Grade is clearly meaningless, I went through all of his vouchers and tossed 37 species that had no other indication that they could actually be found here. I kept 48 species that had other vouchers within about ten miles, since they possibly might be found here. Of those 48 species, 25 have other vouchers from this area and thus probably are actually found here. The other 23 species are the only ones possibly documenting those species here. Since there is obviously a big uncertainty as to whether those 23 species are actually found here, I put a ? in the voucher column below for those species. I'll eventually toss all such vouchers if they aren't confirmed by future field work or vouchers. Since many other people have collected from this area on many other occasions, it is possible that none of these 23 questionable species are actually found here.

In summary, of 85 species in Orcutt's Mountain Springs Grade collection, 37 of them (44%) almost surely were not actually collected here, 25 of them (29%) might have been collected here, and 23 of them (27%) likely have a low probability that they were collected here.

The above process yielded a total of 1535 accepted vouchers. A large number of different collectors, including many famous names, were responsible for this wonderful list. Table 1 lists the dominant collectors, where I have combined all collector groups containing the dominant collector under that collector's name. (For example, Jon Rebman has vouchers with 24 different combinations of collector names; all combinations were subsumed under Jon P. Rebman et al.)

Thanks to a communication with Duncan Bell Potentilla rimicola was subsequently removed from the voucher flora. Thanks to Aaron Schusteff, Rebecca Peters, and Barbara Ertter, it turned out that this voucher, DS39086, was actually Potentilla rivalis, and the apparent misdetermination was a databasing error. It isn't clear where exactly the locality was for this voucher since it just says Mountain Springs, so it may or may not be in the area considered here. I'll add it to the next iteration of the flora, since it might be found in this area.

Table 1. Dominant Collectors for the Mountain Springs Grade Area

126Jon P. Rebman et al
94Joni Ward et al
72Duncan S. Bell et al
70Edgar A. Mearns
59Roxana S. Ferris
56A. C. Sanders et al
56Mary F. Spencer
48Frank F. Gander
48F. W. Peirson

These collectors were responsible for 629 of the 1535 accepted vouchers, 41% of the total. Other notable collectors include Alice Eastwood, Lyman Benson, W. L. Jepson, Marcus E. Jones, S. B. Parish and C.B. Wolf. This area has obviously been a favorite stop for botanists!

Checklist Summary

The voucher list resulted in a list of 340 species from vouchers other than from Orcutt, plus an additional 23 species with only an Orcutt voucher that may or may not document them being here. The total voucher list contains 363 taxa.

It is possible that some of the 340 species in the following checklist from collectors other than Orcutt are not actually in the Mountain Springs Grade area, since Orcutt was not alone in having somewhat vague localities, especially among the earlier collectors.

The checklist below contains 185 observed species, from the union of the Rebman list, the Crouse list, and the field surveys.

The total checklist contains 388 taxa.

The checklist does not contain Herissantia crispa, which was reported as being in this area in Beauchamp's 1986 Flora of San Diego County. If anyone has any information as to the source of this report in Beauchamp, please let me know.


See Information about the order in which the species are presented, and the links from the Scientific Name and Common Name.

The column #V gives the number of vouchers for this area, with a maximum value of 9. If a species was only vouchered by Orcutt, the column contains ? unless it was also in Rebman's or Crouse's checklists. Note that these species marked with a ? may not actually be present here!

The column #Pls gives the minimum number of plants, up to a maximum of 99 plants, for each species observed in the surveys of the two different areas. The area surveyed one mile east of the Mountain Springs Exit on I-8 is in the column with header East. The area surveyed near the Mountain Springs Exit on 11/17/14 is in the column with header MS. An O in the column for Mountain Springs indicate a species not observed in the survey, but which was was in Rebman's Checklist for Mountain Springs, or was observed by Mike Crouse on 2/13/13.

One species, ironwood, Olneya tesota, has a pl? in this column to indicate it may have been planted. It is near the old cabin in an alcove just south of I-8.

Some species in each surveyed area need further work to be certain of their determination; these species are marked with the usual qualifiers in the #Pls columns.

Version for printing, without lines and other text on this page: html (11 pages) or pdf Clickbook booklet (3 double-sided pages). (See printing instructions for an explanation of these options.).

#FamilScientific Name(*)Common Name#V#Pls
1SelagSelaginella eremophiladesert spike-moss5  
2PteriCheilanthes covilleibeady lipfern5 30
3PteriCheilanthes parryiwoolly lipfern4  
4PteriCheilanthes viscidasticky lipfern9299
5PteriNotholaena californica ssp. californicaCalifornia cloak fern353
6PteriPellaea mucronata var. mucronatabird's-foot fern8120
7CupreJuniperus californicaCalifornia juniper91099
8EphedEphedra asperaMormon tea9  
9EphedEphedra californicadesert tea6  
10EphedEphedra nevadensisNevada ephedra5~30~99
11EphedEphedra viridisgreen ephedra3  
12PinacPinus monophyllapinyon pine3  
13PinacPinus quadrifoliaParry pinyon pine2  
14SauruAnemopsis californicayerba mansa  20
15AcantJusticia californicachuparosa98 
16AmaraAmaranthus fimbriatusfringed amaranth  5
17AmaraAmaranthus palmeriPalmer's amaranth1  
18AmaraAmaranthus powelliiPowell's amaranth1  
19AnacaRhus ovatasugar bush616
20ApiacApiastrum angustifoliumwild celery14 
21ApocyAsclepias albicanswhite-stemmed milkweed7104
22ApocyAsclepias subulatarush milkweed1  
23ApocyFunastrum cynanchoides var. hartwegiiclimbing milkweed150 
24ApocyFunastrum hirtellumrambling milkweed2  
25ApocyMatelea parvifoliaspearleaf2 9
26AsterAcamptopappus sphaerocephalus var. hirtellushairy goldenhead?  
27AsterAdenophyllum porophylloidesSan Felipe dogweed91015
28AsterAmbrosia acanthicarpabur-ragweed1  
29AsterAmbrosia dumosaburroweed99999
30AsterAmbrosia salsola var. salsolacheesebush399 
31AsterAnisocoma acaulisscale-bud2  
32AsterArtemisia dracunculuswild tarragon2  
33AsterArtemisia ludoviciana ssp. albulawhite mugwort3 10
34AsterArtemisia tridentata ssp. vaseyanamountain sagebrush?  
35AsterBaccharis brachyphyllashort-leaved baccharis125 
36AsterBaccharis salicifolia ssp. salicifoliamule fat3  
37AsterBaccharis sergiloidesdesert baccharis25010
38AsterBahiopsis parishiiParish's viguiera99999
39AsterBebbia juncea var. asperasweetbush5502
40AsterBrickellia atractyloides var. argutaCalifornia spear-leaved brickellia 55
41AsterBrickellia atractyloides var. odontolepisCalifornia spear-leaved brickellia8  
42AsterBrickellia californicaCalifornia brickellbush?25 
43AsterBrickellia frutescensshrubby brickellia9120
44AsterChaenactis artemisiifoliameally white pincushion1  
45AsterChaenactis fremontiiFremont pincushion999 
46AsterChloracantha spinosa var. spinosaspiny goldenbush?  
47AsterDeinandra floribundaTecate tarplant3  
48AsterDieteria canescens var. canescenshoary-aster2  
49AsterDieteria canescens var. leucanthemifoliahoary-aster1  
50AsterEncelia farinosabrittlebush79999
51AsterEncelia frutescensbutton encelia1  
52AsterEricameria brachylepisboundary goldenbush95099
53AsterEricameria linearifolianarrowleaf goldenbush6  
54AsterEricameria pinifoliapine goldenbush?  
55AsterErigeron canadensishorseweed  15
56AsterEriophyllum wallacei var. wallaceiWallace's woolly daisy999 
57AsterGrindelia camporumGreat Valley gumweed1  
58AsterGutierrezia californicaCalifornia matchweed62599
59AsterGutierrezia sarothraematchweed3  
60AsterHulsea mexicanaMexican hulsea1  
61AsterIsocoma acradenia var. eremophilasolitary-leaved alkali goldenbush49920
62AsterLasthenia gracilisgoldfields3  
63AsterLayia platyglossacommon tidy-tips1  
64AsterLeptosyne californicaCalifornia coreopsis3  
65AsterLogfia arizonicaArizona herba impia1  
66AsterLogfia filaginoidesCalifornia filago120 
67AsterMadia gracilisslender madia1  
68AsterMalacothrix clevelandiiannual malacothrix?  
69AsterMalacothrix glabratadesert dandelion199 
70AsterMonoptilon bellioidesdesert star350 
71AsterPalafoxia arida var. aridaSpanish needle21 
72AsterPectis papposa var. papposachinch-weed1 O
73AsterPerityle emoryiEmory's rock-daisy999 
74AsterPleurocoronis plurisetaarrow-leaf4991
75AsterPluchea sericeaarrow-weed499 
76AsterPorophyllum gracileodora9110
77AsterPrenanthella exiguabright-white2  
78AsterPseudognaphalium canescenswhite everlasting  3
79AsterRafinesquia neomexicanadesert chicory920 
80AsterSenecio californicusCalifornia groundsel4  
81AsterSenecio flaccidus var. douglasiibush senecio1  
82AsterSenecio flaccidus var. monoensisMono ragwort53 
83AsterSenecio mohavensisMojave ragwort799 
84AsterSolidago confinissouthern goldenrod1  
85AsterSonchus oleraceus*sow thistle  2
86AsterStephanomeria exiguaslender wreathplant1  
87AsterStephanomeria pauciflorawire-lettuce79915
88AsterStylocline gnaphaloideseverlasting nest-straw2  
89AsterStylocline psilocarphoidesPeck's stylocline1  
90AsterSymphyotrichum defoliatumSan Bernardino aster1  
91AsterTrichoptilium incisumyellow-head2  
92AsterTrixis californica var. californicaCalifornia trixis89950
93AsterUropappus lindleyisilver puffs22 
94BignoChilopsis linearis ssp. arcuatadesert-willow54 
95BoragAmsinckia intermediacommon fiddleneck330 
96BoragAmsinckia tessellata var. tessellatabristly fiddleneck130 
97BoragCryptantha angustifolianarrow-leaved cryptantha11 
98BoragCryptantha barbigera var. barbigerabearded cryptantha999 
99BoragCryptantha barbigera var. fergusoniaeSanta Rosa Mountain bearded cryptantha ~50 
100BoragCryptantha circumscissa var. circumscissacushion cryptantha2  
101BoragCryptantha decipiensgravel cryptantha5  
102BoragCryptantha intermedia var. intermediapopcorn flower440 
103BoragCryptantha maritimaGuadalupe cryptantha15 
104BoragCryptantha micrantha var. lepidamountain red-root cryptantha2  
105BoragCryptantha microstachysTejon cryptantha1  
106BoragCryptantha nevadensisNevada cryptantha3  
107BoragCryptantha pterocarya var. pterocaryawing-nut cryptantha230 
108BoragCryptantha pterocarya var. purpusiiPurpus' wing-nut cryptantha25 
109BoragCryptantha racemosabushy cryptantha3  
110BoragEmmenanthe penduliflora var. penduliflorawhispering bells599 
111BoragEriodictyon trichocalyx var. lanatumsmoothleaf yerba santa55 
112BoragEucrypta chrysanthemifolia var. bipinnatifidaeucrypta320 
113BoragEucrypta micranthadesert eucrypta1  
114BoragHeliotropium curassavicum var. oculatumseaside heliotrope12 
115BoragNama demissa var. demissapurple mat499 
116BoragNemophila menziesii var. integrifoliababy blue eyes1  
117BoragPectocarya penicillatacombseed?10 
118BoragPectocarya platycarpabroad-fruited combseed2  
119BoragPectocarya recurvatacurvenut combseed199 
120BoragPectocarya setosamoth combseed1  
121BoragPhacelia affinislimestone phacelia1  
122BoragPhacelia campanularia ssp. campanulariadesert bluebells1  
123BoragPhacelia crenulata var. minutifloralittle-flowered heliotrope phacelia2  
124BoragPhacelia cryptanthalimestone phacelia199 
125BoragPhacelia distanscommon phacelia999 
126BoragPhacelia minorwild canterbury bells199 
127BoragPholisma arenariumsand plant5  
128BoragPholistoma auritum var. arizonicumArizona fiesta flower2  
129BoragPholistoma membranaceumwhite fiesta flower940 
130BoragPlagiobothrys arizonicusArizona popcorn flower ?1 
131BoragPlagiobothrys jonesiiJones' popcorn flower1  
132BoragTiquilia palmeriPalmer's coldenia1  
133BrassBoechera perennansperennial rock-cress7 O
134BrassBoechera pulchra, B. xylopodabeautiful rock-cress5  
135BrassBoechera retrofracta XHolboell's rock-cress1  
136BrassBoechera xylopodaslender & beautiful rock-cress3  
137BrassBrassica tournefortii*Asian mustard 9999
138BrassCaulanthus cooperiCooper's jewel-flower3  
139BrassCaulanthus lasiophyllusCalifornia mustard1  
140BrassDescurainia pinnatawestern tansy-mustard120 
141BrassDithyrea californicaspectacle-pod?  
142BrassDraba cuneifoliawedge-leaved draba1  
143BrassLepidium lasiocarpum ssp. lasiocarpumhairy-podded pepper-grass115 
144BrassSisymbrium irio*London rocket150 
145BrassSisymbrium orientale*Oriental mustard1  
146BrassStreptanthus campestrissouthern jewel-flower1  
147BrassThysanocarpus curvipesfringe-pod3  
148BrassThysanocarpus curvipes ssp. curvipesfringe-pod1  
149BrassThysanocarpus curvipes ssp. eradiatusfringe-pod299 
150BurseBursera microphyllaelephant tree2  
151CactaCylindropuntia bigeloviiteddy-bear cholla399 
152CactaCylindropuntia echinocarpasilver cholla2  
153CactaCylindropuntia ganderiGander's cholla220 
154CactaCylindropuntia wolfiiWolf's cholla99999
155CactaEchinocereus engelmanniiEngelmann's hedgehog cactus34099
156CactaFerocactus cylindraceusCalifornia barrel cactus99999
157CactaMammillaria dioicaCalifornia fish-hook cactus33099
158CactaOpuntia basilaris var. basilarisbeavertail cactus 22
159CactaOpuntia chloroticapancake prickly-pear1  
160CactaOpuntia phaeacanthadesert prickly-pear11 
161CampaNemacladus glanduliferusglandular nemacladus ~2 
162CampaNemacladus pinnatifiduscomb-leaved nemacladus1  
163CapriLonicera subspicata var. denudatasouthern honeysuckle1  
164CaryoAchyronychia cooperifrost mat1  
165ChenoAtriplex canescens var. canescensfour-wing saltbush7102
166ChenoAtriplex hymenelytradesert holly2  
167ChenoAtriplex lentiformisbig saltbush2  
168ChenoChenopodium californicumCalifornia goosefoot1  
169ChenoSuaeda nigrabush seepweed3  
170CleomPeritoma arboreabladderpod?  
171CrassCrassula connatapygmy-weed199 
172CrassDudleya arizonicaArizona chalk dudleya52015
173CucurCucurbita palmatacoyote melon2  
174CucurMarah macrocarpawild-cucumber1  
175EricaArctostaphylos glaucabigberry manzanita7  
176EuphoChamaesyce albomarginatarattlesnake weed2  
177EuphoChamaesyce maculata*spotted spurge1  
178EuphoChamaesyce melanadeniared-gland spurge95099
179EuphoChamaesyce micromeraSonoran spurge1  
180EuphoChamaesyce polycarpasmall-seeded spurge4 O
181EuphoChamaesyce serpyllifoliathyme-leafed spurge1  
182EuphoChamaesyce setilobastarfish (Yuma) spurge1  
183EuphoCroton californicusCalifornia croton?14 
184EuphoDitaxis lanceolatanarrowleaf ditaxis11 
185EuphoDitaxis neomexicanaNew Mexico ditaxis  1
186EuphoStillingia linearifolialinear-leaved stillingia99930
187FabacAcmispon argophyllus var. argophyllussouthern California silver-lotus450 
188FabacAcmispon glaber var. brevialatusshort-winged deerweed91599?
189FabacAcmispon haydoniipygmy lotus99999?
190FabacAcmispon heermannii var. heermanniisilky lotus1  
191FabacAcmispon parviflorussmall-flowered lotus1  
192FabacAcmispon rigidusdesert lotus1  
193FabacAcmispon strigosusstrigose lotus150 
194FabacAstragalus coccineusscarlet milk-vetch9  
195FabacAstragalus crotalariaeSalton milk-vetch1  
196FabacAstragalus didymocarpus var. dispermusdwarf white milk-vetch1  
197FabacAstragalus didymocarpus var. obispoensisSan Luis Obispo milk-vetch2  
198FabacAstragalus douglasii var. perstrictusJacumba milk-vetch2  
199FabacAstragalus insularis var. harwoodiiHarwood's milk-vetch1  
200FabacAstragalus lentiginosusfreckled milk-vetch3  
201FabacAstragalus palmeriPalmer's milk-vetch9  
202FabacLathyrus splendenspride-of-California2  
203FabacLupinus arizonicusArizona lupine3  
204FabacLupinus concinnusbajada lupine499 
205FabacLupinus concinnus ssp. orcuttiibajada lupine2  
206FabacLupinus excubitus var. austromontanusmountain grape-soda lupine1  
207FabacLupinus excubitus var. halliibush lupine220 
208FabacLupinus excubitus var. mediusMountain Springs bush lupine699 
209FabacLupinus sparsiflorusCoulter's lupine210 
210FabacMelilotus indicus*sourclover1  
211FabacOlneya tesotaironwood pl? 1 
212FabacProsopis glandulosa var. torreyanahoney mesquite8251
213FabacPsorothamnus arborescens var. simplicifoliusCalifornia indigo-bush1  
214FabacPsorothamnus schottiiindigo bush810 
215FabacPsorothamnus spinosussmoke tree3  
216FabacSenegalia greggiicatclaw39999
217FabacTrifolium willdenoviitomcat clover1  
218FabacTrifolium wormskioldiicows clover?  
219FagacQuercus chrysolepiscanyon live oak1  
220FagacQuercus cornelius-mulleridesert scrub oak9  
221FouquFouquieria splendens ssp. splendensocotillo99930
222GarryGarrya flavescensashy silk tassel?  
223GarryGarrya veatchiicanyon silktassel2  
224GentiEustoma exaltatum ssp. exaltatumcatchfly prairie-gentian1  
225GeranErodium cicutarium*redstem filaree299 
226GeranErodium texanumTexas filaree1  
227GrossRibes indecorumwhite-flowering currant?  
228GrossRibes quercetorumoak gooseberry1  
229KrameKrameria bicolorwhite rhatany92099
230KrameKrameria erectaPima rhatany9130
231LamiaHyptis emoryidesert-lavender750 
232LamiaSalvia apianawhite sage99915
233LamiaSalvia carduaceathistle sage?  
234LamiaSalvia columbariaechia699 
235LamiaSalvia vaseyiVasey's sage9 O
236LamiaTrichostema parishiiParish's bluecurls?  
237LoasaMentzelia albicauliswhite-stemmed blazing star 20 
238LoasaMentzelia hirsutissimahairy stickleaf2  
239LoasaMentzelia involucratabracted blazing star2  
240LoasaMentzelia tricuspisthree-pointed blazing star1  
241LoasaMentzelia veatchianaVeatch's blazing star2  
242LoasaPetalonyx thurberi ssp. thurberiThurber's sandpaper-plant415 
243LythrLythrum californicumCalifornia loosestrife1 5
244MalvaFremontodendron californicumCalifornia fremontia?  
245MalvaHibiscus denudatusrock hibiscus4  
246MalvaSphaeralcea ambigua var. rosacearosy apricot mallow83520
247MalvaSphaeralcea orcuttiiCarrizo mallow1  
248MontiCalyptridium monandrumsand cress299 
249NyctaBoerhavia triquetra var. intermediafivewing spiderling2 5
250NyctaMirabilis laevis var. crassifoliaCalifornia four o'clock3  
251NyctaMirabilis laevis var. retrorsaBigelow's desert four-o'clock4310
252NyctaMirabilis tenuilobaslender-lobed four o'clock940 
253OleacMenodora scabra var. glabrescensbroom twinberry6 1
254OnagrCamissoniopsis hirtellafield suncup1  
255OnagrCamissoniopsis pallida ssp. pallidapale suncup399 
256OnagrChylismia cardiophylla ssp. cardiophyllaheartleaf suncup3  
257OnagrChylismia claviformis ssp. peirsoniibrown-eyed primrose9  
258OnagrEpilobium canumCalifornia fuchsia2  
259OnagrEpilobium canum ssp. garrettiiGarrett's California-fuchsia1  
260OnagrEpilobium canum ssp. latifoliummountain California-fuchsia?  
261OnagrEremothera boothii ssp. condensataBooth's evening primrose1  
262OnagrEremothera chamaenerioideslong-fruit suncup2  
263OnagrEulobus californicusCalifornia suncup599 
264OnagrOenothera californica ssp. californicaCalifornia evening-primrose3  
265OrobaCastilleja foliolosawoolly Indian paintbrush8  
266PapavEschscholzia minutiflora ssp. minutiflorasmall-flowered poppy999 
267PhrymMimulus aurantiacus var. ariduslow bush monkeyflower622
268PhrymMimulus bigelovii var. bigeloviiBigelow's monkeyflower 12 
269PhrymMimulus guttatuscommon monkeyflower1  
270PlantKeckiella antirrhinoides var. antirrhinoideschaparral beardtongue1  
271PlantKeckiella antirrhinoides var. microphyllalittle-leaved chaparral beardtongue4  
272PlantMohavea confertifloraghost flower3  
273PlantPenstemon clevelandii var. clevelandiiCleveland's beardtongue955
274PlantPenstemon heterophyllus var. australissouthern foothill penstemon?  
275PlantPlantago ovatadesert plantain299 
276PolemAliciella latifolia ssp. latifoliabroad-leaf gilia1  
277PolemAllophyllum glutinosumsticky false-gilia1  
278PolemEriastrum densifolium ssp. elongatumgiant woolly-star?  
279PolemEriastrum eremicum ssp. eremicumdesert woolly-star299 
280PolemEriastrum sapphirinumsapphire woolly-star1  
281PolemGilia diegensiscoastal gilia2  
282PolemGilia stellatastar gilia399 
283PolemIpomopsis tenuifoliaslender-leaved ipomopsis41 
284PolemLinanthus bellusdesert beauty2  
285PolemLinanthus bigeloviiBigelow's linanthus1  
286PolemLinanthus pungensgranite prickly phlox932
287PolemLoeseliastrum schottiiSchott's calico43 
288PolemPhlox stansburyicold-desert phlox1  
289PolygChorizanthe brevicornu var. brevicornubrittle spineflower41 
290PolygChorizanthe fimbriata var. laciniatalace-fringed spineflower8  
291PolygChorizanthe staticoidesTurkish rugging1  
292PolygEriogonum davidsoniiDavidson's buckwheat1  
293PolygEriogonum elongatum var. elongatumlong-stemmed buckwheat1  
294PolygEriogonum fasciculatum var. flavovirideCalifornia buckwheat1  
295PolygEriogonum fasciculatum var. foliolosumCalifornia buckwheat1  
296PolygEriogonum fasciculatum var. polifoliumCalifornia buckwheat95099
297PolygEriogonum gracileslender buckwheat?  
298PolygEriogonum inflatumdesert trumpet9815
299PolygEriogonum maculatumspotted buckwheat2  
300PolygEriogonum parishiiParish's buckwheat1  
301PolygEriogonum reniformekidney-leaf buckwheat2  
302PolygEriogonum thomasiiThomas' buckwheat3?3 
303PolygEriogonum thurberiThurber's buckwheat1  
304PolygEriogonum wrightii var. membranaceumWright's buckwheat31030
305PolygEriogonum wrightii var. nodosumWright's buckwheat13 
306PolygPterostegia drymarioidesthreadstem25 
307RanunAnemone tuberosatuber anemone1  
308RanunClematis paucifloravirgin's bower1  
309RanunDelphinium parishii ssp. subglobosumintermediate larkspur6~2 
310RanunDelphinium parryi ssp. parryiblue larkspur1  
311RhamnCeanothus cuneatus var. cuneatusbuck brush?  
312RhamnCeanothus leucodermischaparral whitethorn2  
313RhamnZiziphus obtusifolia var. canescensgraythorn1  
314RhamnZiziphus parryi var. parryilotebush4 10
315RosacAdenostoma fasciculatumchamise1  
316RosacAdenostoma sparsifoliumred shanks3  
317RosacCercocarpus minutiflorusSan Diego mountain mahogany2  
318RosacColeogyne ramosissimablack brush  10
319RosacPrunus fremontiidesert apricot99999
320RosacPurshia tridentata var. glandulosadesert bitterbrush2  
321RubiaGalium angustifoliumnarrow-leaved bedstraw1  
322RubiaGalium stellatumstar-flowered bedstraw9510
323RutacThamnosma montanaturpentine broom9150
324SalicPopulus fremontii ssp. fremontiiFremont cottonwood3  
325SalicSalix exigua var. exiguanarrowleaf willow  1
326SalicSalix laevigatared willow3  
327SimmoSimmondsia chinensisjojoba92099
328SolanDatura discolordesert thornapple1  
329SolanDatura wrightiisacred datura12 
330SolanLycium andersoniiAnderson's boxthorn560~30
331SolanLycium parishiiParish's boxthorn1 1?
332SolanNicotiana glauca*tree tobacco  5?
333SolanNicotiana obtusifoliadesert tobacco3401
334SolanPhysalis crassifoliathick-leaved ground cherry542
335SolanPhysalis philadelphica*tomatillo?  
336SolanSolanum elaeagnifolium*horse-nettle?  
337TamarTamarix chinensis*Chinese tamarisk1  
338TamarTamarix gallica*French tamarisk1  
339TamarTamarix parviflora*tamarisk1  
340TamarTamarix ramosissima*saltcedar39930
341UrticParietaria hespera var. hesperapellitory125 
342UrticUrtica urens*dwarf nettle1  
343ViscaPhoradendron bolleanumdense mistletoe7  
344ViscaPhoradendron californicumdesert mistletoe95020
345ZygopFagonia laevisCalifornia fagonia5  
346ZygopLarrea tridentatacreosote bush81 
347AgavaAgave deserti var. desertidesert agave99999
348AgavaHesperocallis undulatadesert lily1  
349AgavaYucca schidigeraMohave yucca7 10
350ArecaWashingtonia filiferaCalifornia fan palm19920
351CyperEleocharis montevidensissand spikerush1  
352JuncaJuncus acutus ssp. leopoldiispiny rush7994
353JuncaJuncus bufonius var. bufoniustoad rush1  
354JuncaJuncus mexicanusMexican rush  25
355JuncaJuncus torreyiTorrey's rush  10?
356JuncaJuncus xiphioidesiris-leaved rush1  
357PoaceAristida adscensionissix-weeks three-awn1  
358PoaceAristida purpureapurple three-awn 9920
359PoaceAvena barbata*slender wild oats155
360PoaceAvena fatua*wild oats 1 
361PoaceBothriochloa barbinodiscane bluestem1  
362PoaceBromus diandrus*ripgut brome3 10
363PoaceBromus madritensis ssp. rubens*red brome39999
364PoaceDistichlis spicatasaltgrass39999
365PoaceEchinochloa colona*jungle rice1  
366PoaceEchinochloa crus-galli*barnyard grass1  
367PoaceEragrostis cilianensis*stinkgrass1  
368PoaceEragrostis pectinacea var. pectinaceatufted lovegrass1  
369PoaceFestuca octoflorasix-weeks fescue2  
370PoaceHilaria rigidabig galleta1 O
371PoaceLeptochloa fusca ssp. uninerviaMexican sprangletop1  
372PoaceMelica frutescenstall melica75 
373PoaceMelica imperfectacoast-range melic7  
374PoaceMuhlenbergia rigensdeergrass1  
375PoacePoa secundaone-sided blue grass1  
376PoacePoa secunda ssp. secundaone-sided bluegrass1  
377PoacePolypogon monspeliensis*rabbits-foot grass2 25
378PoacePolypogon viridis*green bentgrass1  
379PoaceSchismus barbatus*Mediterranean schismus299 
380PoaceSporobolus airoidesalkali sacaton35099
381PoaceStipa coronatagiant needlegrass1  
382PoaceStipa hymenoidesIndian ricegrass17 
383PoaceStipa parishii var. parishiiParish's needlegrass ~1 
384PoaceStipa speciosadesert needlegrass44020
385RuscaNolina bigeloviiBigelow's nolina99999
386ThemiDichelostemma capitatum ssp. capitatumblue dicks  O
387ThemiDichelostemma capitatum ssp. pauciflorumfew-flowered blue dicks2  
388TyphaTypha domingensissouthern cattail  ~99

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Copyright © 2014-2015 by Tom Chester, Karyn Sauber, Mike Crouse, Keir Morse, Adrienne Ballwey, Jim Roberts, Jeff Field, and Bill Sullivan
Permission is freely granted to reproduce any or all of this page as long as credit is given to me at this source:
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Last update: 23 March 2015