Plant Checklist for Whitewater River Canyon, Riverside County portion, San Bernardino Mountains



This is a flora of the Riverside County portion of the Whitewater River Area, including the PCT Section C2 from Cottonwood Canyon to Whitewater Canyon, since that section of the PCT travels into Whitewater Canyon. For this flora, we excluded the upper part of Whitewater Canyon that is in San Bernardino County, since all of our botanical trips in this area have stayed within Riverside County.

In contrast to the other floras of Whitewater Canyon area we've placed online, this is a more tightly-focused flora of species that we are quite confident actually occur in the Whitewater Canyon area. The main development that made this possible was the Whitewater Bioblitz of April 12-13, 2010, and the team of volunteers from the Rancho Santa Ana Botanical Garden, along with additional volunteers, who took a whopping 709 vouchers in the Riverside County portion of Whitewater Canyon, along with additional vouchers in the San Bernardino County portion.

The problem in compiling a reliable flora of Whitewater Canyon had been that older vouchers with a locality of just Whitewater may or may not have been taken from Whitewater Canyon. Often, older vouchers just cite the nearest known-at-that-time location, even though the vouchers might have been taken miles away from that location.

Those 709 vouchers from the Bioblitz document a large number of species that actually occur here, and so, along with our surveys and additional vouchers taken since 2010, give a reliable set of species for this flora.

Thus for this flora, we have ignored species that were only vouchered before 2010 and that were not seen in our surveys. A careful examination of the pre-2010 vouchers would probably result in the addition of some species to this flora, but we haven't had time to do that examination yet.

This flora contains 349 taxa, compared to 524 species for a flora that included all of the pre-2010 vouchers which almost surely contained a number of species not actually found in Whitewater Canyon.

Of those 349 taxa, 263 were in the vouchers taken in 2010 and later, and 86 were added from our surveys. Of those 86, 44 have vouchers taken prior to 2010, 33 were found in Whitewater Canyon only by our field work, and 9 were only from the PCT Section C2, which may or may not occur in the Whitewater Canyon drainage area.

Pictures of some of the species from surveys by Michael Charters are here: February 2009; April 2009 Part One; April 2009 Part Two; and 18 March 2010.

Checklist for Whitewater River Canyon

Basic information about the checklist presentation and links:

An asterisk before the Common Name indicates a non-native taxon.

The column with header #V gives the number of vouchers in this area, truncated at 9, including the pre- and post-2010 vouchers.

The column with header #Pls gives the minimum number of plants we have seen, from all of our surveys here, up to a maximum of 99 plants. Some species seen only by Michael Charters or RT Hawke are noted by MC or RT in this column, since no estimate of abundances was made for those species. Species found only on the PCT north of Cottonwood Canyon (Section C2) are noted by C2 in this column.

Two taxa in the checklist below are uncertain:

Version for printing, without lines and other text on this page: html (8 pages) or pdf Clickbook booklet (2 double-sided pages). (See printing instructions for an explanation of these options)

#FamScientific Name
Link goes to the Jepson eflora
(*)Common Name
Link goes to Calphotos
1SelSelaginella bigeloviiBigelow's spike-moss999
2EquEquisetum hyemale ssp. affinehorsetail3 
3PteCheilanthes covilleibeady lipfern8MC
4PteCheilanthes parryiwoolly lipfern410
5PtePellaea andromedifoliacoffee fern92
6PtePellaea mucronata var. mucronatabird's-foot fern88
7PtePentagramma triangularis ssp. maxoniiMaxon's silverback fern MC?
8PtePentagramma triangularis ssp. triangularisgoldback fern4MC?
9CupCalocedrus decurrensincense-cedar 2
10CupJuniperus californicaCalifornia juniper431
11EphEphedra californicadesert tea999
12AdoSambucus nigra ssp. caeruleablue elderberry11
13AmaAmaranthus fimbriatusfringed amaranth C2
14AnaRhus ovatasugar bush999
15ApiLomatium mohavenseMojave lomatium 1
16ApiTauschia argutasouthern tauschia3 
17ApoFunastrum cynanchoides var. hartwegiiclimbing milkweed63
18ApoNerium oleander*oleander2 
19AstAcamptopappus sphaerocephalus var. sphaerocephalusgoldenhead9MC
20AstAmbrosia acanthicarpabur-ragweed5 
21AstAmbrosia dumosaburroweed810
22AstAmbrosia salsola var. salsolacheesebush999
23AstArtemisia californicaCalifornia sagebrush699
24AstArtemisia dracunculuswild tarragon 35
25AstArtemisia ludoviciana ssp. albulawhite mugwort1 
26AstBaccharis brachyphyllashort-leaved baccharis96
27AstBaccharis salicifolia ssp. salicifoliamule fat999
28AstBaccharis salicinaEmory's baccharis610
29AstBaccharis sergiloidesdesert baccharis940
30AstBahiopsis parishiiParish's goldeneye965
31AstBebbia juncea var. asperasweetbush999
32AstBrickellia atractyloidesCalifornia spear-leaved brickellia7 
33AstBrickellia californicaCalifornia brickellbush2 
34AstBrickellia desertorumdesert brickellia74
35AstCalycoseris parryiyellow tackstem51
36AstCentaurea melitensis*tocalote 10
37AstChaenactis fremontiiFremont pincushion999
38AstChaenactis glabriuscula var. glabriusculayellow pincushion9MC
39AstCirsium occidentale var. californicumCalifornia thistle2MC
40AstDicoria canescensdesert dicoria9 
41AstEncelia actoniActon encelia999
42AstEncelia farinosabrittlebush999
43AstEricameria cuneata var. spathulatawide-leaved rock goldenbush31
44AstEricameria linearifolianarrowleaf goldenbush933
45AstEricameria paniculatablackbanded rabbitbrush999
46AstEricameria teretifolianeedle-leaved rabbitbrush13
47AstEriophyllum confertiflorum var. confertiflorumgolden yarrow810
48AstEriophyllum wallaceiWallace's woolly daisy999
49AstGutierrezia californicaCalifornia matchweed111?
50AstHelminthotheca echioides*bristly ox-tongue MC
51AstHeterotheca grandifloratelegraph weed 5
52AstHeterotheca sessiliflora ssp. fastigiataerect goldenaster970
53AstIsocoma acradenia var. eremophilatoothed-leaved alkali goldenbush999
54AstLactuca serriola*prickly lettuce1MC
55AstLasthenia coronariasouthern goldfields899
56AstLasthenia gracilisgoldfields399
57AstLayia glandulosawhite tidy-tips5MC
58AstLepidospartum squamatumscale-broom999
59AstLeptosyne bigeloviiBigelow's coreopsis999
60AstLeptosyne californicaCalifornia coreopsis5 
61AstLogfia depressadwarf filago1 
62AstLogfia filaginoidesCalifornia filago970
63AstMalacothrix glabratadesert dandelion930
64AstMatricaria discoidea*pineapple weed 10
65AstPalafoxia arida var. aridaSpanish needle9MC
66AstPeucephyllum schottiipygmy-cedar9MC
67AstPluchea sericeaarrow-weed6 
68AstPseudognaphalium luteoalbum*common cudweed4MC
69AstPulicaria paludosa*Spanish false-fleabane999
70AstRafinesquia californicaCalifornia chicory3MC
71AstRafinesquia neomexicanadesert chicory910
72AstSenecio californicusCalifornia groundsel41
73AstSenecio vulgaris*common groundsel21
74AstSonchus asper ssp. asper*prickly sow thistle1MC
75AstSonchus oleraceus*sow thistle1MC
76AstStephanomeria exigua ssp. exiguaslender wreathplant5 
77AstStephanomeria pauciflorawire-lettuce555
78AstStylocline gnaphaloideseverlasting nest-straw9MC
79AstSyntrichopappus lemmoniiLemmon's syntrichopappus1 
80AstUropappus lindleyisilver puffs1MC
81BetAlnus rhombifoliawhite alder71
82BigChilopsis linearis ssp. arcuatadesert-willow999
83BorAmsinckia intermediacommon fiddleneck799
84BorAmsinckia retrorsasmall-flowered fiddleneck MC
85BorAmsinckia tessellata var. tessellatabristly fiddleneck6MC
86BorCryptantha angustifolianarrow-leaved cryptantha4MC
87BorCryptantha barbigera var. fergusoniaeSanta Rosa Mountain bearded cryptantha930
88BorCryptantha circumscissa var. circumscissacushion cryptantha1 
89BorCryptantha intermedia var. intermediapopcorn flower950
90BorCryptantha micrantha var. micranthared-root cryptantha4MC
91BorCryptantha muricata var. jonesiiJones' prickly-nut cryptantha2 
92BorCryptantha muricata var. muricatashowy prickly-nut cryptantha1 
93BorCryptantha utahensisscented cryptantha8 
94BorEmmenanthe penduliflora var. penduliflorawhispering bells999
95BorEriodictyon crassifolium var. crassifoliumthick-leaved yerba santa1 
96BorEriodictyon trichocalyx var. trichocalyxsmoothleaf yerba santa999
97BorEucrypta chrysanthemifolia var. bipinnatifidaeucrypta15
98BorNama demissa var. demissapurple mat9MC
99BorNemophila menziesii var. menziesiibaby blue eyes499
100BorPectocarya heterocarpachuckwalla pectocarya C2
101BorPectocarya linearis ssp. feroculaslender combseed999
102BorPectocarya penicillatacombseed2 
103BorPectocarya peninsularisBaja pectocarya150
104BorPectocarya platycarpabroad-fruited combseed MC
105BorPectocarya recurvatacurvenut combseed299
106BorPectocarya setosamoth combseed1 
107BorPhacelia affinislimestone phacelia MC
108BorPhacelia brachylobashort-lobed phacelia MC
109BorPhacelia campanularia ssp. campanulariadesert bluebells999
110BorPhacelia campanularia ssp. vasiformisdesert bluebells1MC
111BorPhacelia cicutaria var. hispidacaterpillar phacelia1MC
112BorPhacelia distanscommon phacelia950
113BorPhacelia minorwild canterbury bells950
114BorPholistoma membranaceumwhite fiesta flower950
115BorPlagiobothrys arizonicusArizona popcorn flower C2
116BraBoechera perennansperennial rock-cress2MC
117BraBrassica tournefortii*Sahara mustard999
118BraCapsella bursa-pastoris*shepherd's purse MC
119BraDescurainia pinnatawestern tansy-mustard85
120BraHirschfeldia incana*shortpod mustard 10
121BraLepidium lasiocarpum ssp. lasiocarpumhairy-podded pepper-grass 99
122BraNasturtium officinalewater cress4MC
123BraSisymbrium irio*London rocket150
124BraThysanocarpus curvipesfringe-pod799
125BraThysanocarpus laciniatuslace-pod4 
126BraTropidocarpum gracileslender tropidocarpum2 
127CacCylindropuntia echinocarpasilver cholla140
128CacEchinocereus engelmanniiEngelmann's hedgehog cactus230
129CacOpuntia basilaris var. basilarisbeavertail cactus450
130CacOpuntia phaeacanthadesert prickly-pear125
131CamNemacladus glanduliferusglandular nemacladus MC
132CamNemacladus longiflorus var. breviflorusthread plant2 
133CamNemacladus sigmoideussmall-flowered nemacladus1 
134CarLoeflingia squarrosaspreading loeflingia4 
135CarSpergularia bocconi*sand spurrey 10
136CheAtriplex canescens var. canescensfour-wing saltbush3MC
137CheChenopodium album*white goosefoot1 
138CheChenopodium californicumCalifornia goosefoot 2
139CheGrayia spinosahop-sage4 
140ClePeritoma arboreabladderpod91
141CraCrassula connatapygmy-weed199
142CraDudleya saxosa ssp. aloidesdesert dudleya925
143CroCrossosoma bigeloviirock crossosoma95
144CucMarah macrocarpawild-cucumber73
145EriArctostaphylos glaucabigberry manzanita2 
146EupChamaesyce micromeraSonoran spurge C2
147EupChamaesyce polycarpasmall-seeded spurge91
148EupCroton californicusCalifornia croton915
149EupCroton setigerdove weed C2
150EupRicinus communis*castor bean1 
151EupStillingia linearifolialinear-leaved stillingia952
152FabAcmispon argophyllus var. argophyllussouthern California silver-lotus91
153FabAcmispon glaber var. brevialatusshort-winged deerweed999
154FabAcmispon heermannii var. heermanniisilky lotus630
155FabAcmispon procumbens var. procumbenssilky California broom5 
156FabAcmispon strigosusstrigose lotus95
157FabAstragalus douglasii var. douglasiiJacumba milk-vetch2MC
158FabAstragalus tricarinatustriple-ribbed milk-vetch98
159FabLupinus bicolordwarf lupine499
160FabLupinus concinnusbajada lupine810
161FabLupinus excubitus var. austromontanusmountain grape-soda lupine4 
162FabLupinus excubitus var. halliibush lupine1MC
163FabLupinus hirsutissimusstinging lupine65
164FabLupinus sparsiflorusCoulter's lupine925
165FabLupinus truncatuscollar lupine92
166FabMedicago polymorpha*California burclover MC
167FabMelilotus indicus*sourclover1MC
168FabProsopis glandulosa var. torreyanahoney mesquite770
169FabPsorothamnus arborescens var. simplicifoliusCalifornia indigo-bush999
170FabSenegalia greggiicatclaw199
171FagQuercus cornelius-mulleridesert scrub oak210
172FagQuercus wislizeni var. frutescensinterior live oak C2
173GenEustoma exaltatum ssp. exaltatumcatchfly prairie-gentian22
174GerErodium botrys*long-beaked filaree MC
175GerErodium cicutarium*redstem filaree650
176KraKrameria bicolorwhite rhatany930
177LamMonardella linoides ssp. linoidesnarrowleaf monardella 2
178LamSalvia apianawhite sage940
179LamSalvia carduaceathistle sage C2
180LamSalvia columbariaechia999
181LamScutellaria mexicanaMexican bladder sage299
182LamStachys albenscobwebby hedge-nettle2 
183LoaMentzelia laevicaulisgiant blazing star63
184LoaMentzelia veatchianaVeatch's blazing star3MC
185LoaPetalonyx thurberi ssp. thurberiThurber's sandpaper-plant4 
186LytLythrum californicumCalifornia loosestrife110
187MalMalacothamnus fremontiiFremont's bush mallow1 
188MalMalva parviflora*cheeseweed 10
189MalSphaeralcea ambigua var. ambiguaapricot mallow31
190MalSphaeralcea ambigua var. rugosadesert globemallow C2
191MolMollugo cerviana*carpet-weed C2
192MonCalandrinia ciliatared maids150
193MonCalyptridium monandrumsand cress999
194MonClaytonia parviflora ssp. parvifloranarrow-leaved miner's lettuce299
195MyrAnagallis arvensis*scarlet pimpernel1MC
196NycAbronia villosahairy sand verbena620
197NycMirabilis laevis var. retrorsaBigelow's desert four-o'clock930
198NycMirabilis laevis var. villosaBigelow's desert four-o'clock2 
199OnaCamissonia campestris ssp. campestrisfield suncup1 
200OnaCamissonia strigulosastrigose suncup1 
201OnaCamissoniopsis bistortasouthern suncup550
202OnaCamissoniopsis confusaSan Bernardino suncup7 
203OnaCamissoniopsis pallida ssp. halliiHall's suncup730
204OnaCamissoniopsis pallida ssp. pallidapale suncup999
205OnaChylismia claviformis ssp. aurantiacabrown-eyed primrose92
206OnaEpilobium canum ssp. latifoliummountain California-fuchsia420
207OnaEpilobium ciliatum ssp. ciliatumwillowherb1MC
208OnaEulobus californicusCalifornia suncup999
209OnaOenothera elata ssp. hirsutissimaHooker's evening-primrose2MC
210OroCastilleja exserta ssp. exsertapurple owl's-clover65
211OroCastilleja foliolosawoolly Indian paintbrush91
212PapDendromecon rigidabush poppy55
213PapEhrendorferia chrysanthagolden ear drops2MC
214PapEschscholzia androuxiiJoshua Tree poppy1 
215PapEschscholzia californicaCalifornia poppy MC
216PapEschscholzia glyptospermadesert golden poppy1 
217PapEschscholzia minutiflorasmall-flowered poppy2 
218PapEschscholzia parishiiParish's poppy999
219PapPlatystemon californicuscream cups3MC
220PhrMimulus aurantiacus var. pubescenshairy bush monkeyflower1MC
221PhrMimulus bigelovii var. bigeloviiBigelow's monkeyflower MC
222PhrMimulus cardinalisscarlet monkeyflower1MC
223PhrMimulus fremontii var. fremontiiFremont's monkeyflower1 
224PhrMimulus guttatuscommon monkeyflower6MC
225PhrMimulus parishiiParish's monkeyflower41
226PhrMimulus pilosusfalse monkeyflower12
227PlaAntirrhinum coulterianumCoulter's snapdragon5MC
228PlaCollinsia concolorsouthern Chinese houses6MC
229PlaKeckiella antirrhinoides var. antirrhinoideschaparral beardtongue970
230PlaPenstemon centranthifoliusscarlet bugler2 
231PlaPenstemon grinnellii var. grinnelliiGrinnell's beardtongue1 
232PlaPlantago ovatadesert plantain621
233PlaPlantago patagonicaPatagonia plantain8MC
234PlaVeronica anagallis-aquatica*water speedwell3MC
235PlaPlatanus racemosawestern sycamore32
236PolEriastrum eremicum ssp. eremicumdesert woolly-star6 
237PolEriastrum sapphirinum ssp. dasyanthumsapphire woolly-star440
238PolGilia angelensisangel's gilia599
239PolGilia capitata ssp. abrotanifoliaglobe gilia9MC
240PolGilia diegensiscoastal gilia MC
241PolGilia modocensisModoc gilia3 
242PolGilia ochroleuca ssp. bizonatavolcanic gilia2 
243PolGilia ochroleuca ssp. exilisvolcanic gilia9MC
244PolGilia sinuatarosy gilia2 
245PolGilia stellatastar gilia510
246PolLeptosiphon lemmoniiLemmon's linanthus4 
247PolLinanthus bigeloviiBigelow's linanthus430
248PolLinanthus dianthiflorusground pink9MC
249PolLinanthus maculatus ssp. maculatusLittle San Bernardino Mtns. gilia9 
250PolLinanthus parryaesand-blossoms2 
251PolSaltugilia australissouthern gilia5 
252PolSaltugilia latimeriLatimer's woodland-gilia1 
253PolSaltugilia splendens ssp. splendenssplendid gilia4MC
254PolCentrostegia thurberired triangles1 
255PolChorizanthe brevicornu var. brevicornubrittle spineflower92
256PolChorizanthe watsoniiWatson's spineflower3 
257PolChorizanthe xanti var. leucothecawhite-bracted spineflower91
258PolEriogonum deflexumflat-topped buckwheat1 
259PolEriogonum elongatum var. elongatumlong-stemmed buckwheat999
260PolEriogonum fasciculatum var. polifoliumCalifornia buckwheat999
261PolEriogonum gracile var. gracileslender buckwheat215
262PolEriogonum gracile var. incultumslender buckwheat11
263PolEriogonum inflatumdesert trumpet92
264PolEriogonum nudumnaked buckwheat1 
265PolEriogonum plumatellayucca buckwheat MC
266PolEriogonum pusillumyellow-turbans9 
267PolEriogonum saxatilerock buckwheat3 
268PolEriogonum thomasiiThomas' buckwheat9 
269PolEriogonum wrightii var. nodosumWright's buckwheat920
270PolLastarriaea coriacealeather spineflower4 
271PolPterostegia drymarioidesfairy bowties, threadstem920
272RanClematis ligusticifoliavirgin's bower2 
273RanClematis paucifloravirgin's bower210
274RanDelphinium parishii ssp. parishiiParish's larkspur730
275RanDelphinium parryi ssp. parryiblue larkspur1 
276ResOligomeris linifolialineleaf whitepuff11
277RhaCeanothus perplexanscupped-leaf ceanothus42
278RhaFrangula californicaCalifornia coffeeberry MC
279RhaRhamnus ilicifoliahollyleaf redberry43
280RhaZiziphus parryi var. parryilotebush952
281RosAdenostoma fasciculatumchamise330
282RosCercocarpus betuloides var. betuloidesbirch-leaf mountain-mahogany31
283RosPrunus ilicifolia ssp. ilicifoliahollyleaf cherry27
284RosPurshia tridentata var. glandulosadesert bitterbrush63
285RubGalium angustifolium ssp. angustifoliumnarrowleaf bedstraw86
286RubGalium aparinecommon bedstraw1 
287SalPopulus fremontii ssp. fremontiiFremont cottonwood911
288SalPopulus nigra*black poplar1 
289SalSalix exiguanarrowleaf willow93
290SalSalix gooddingiiblack willow1 
291SalSalix laevigatared willow31
292SalSalix lasiolepisarroyo willow3 
293ScrScrophularia californicaCalifornia bee plant4MC
294SolDatura wrightiisacred datura91
295SolLycium andersoniiAnderson's boxthorn5 
296SolNicotiana glauca*tree tobacco31
297SolPhysalis crassifoliathick-leaved ground cherry41
298SolSolanum douglasiiwhite nightshade71
299SolSolanum xantipurple nightshade53
300TamTamarix ramosissima*saltcedar52
301UrtUrtica dioica ssp. holosericeastinging nettle MC
302VisPhoradendron californicumdesert mistletoe925
303VisPhoradendron juniperinummistletoe 3
304VisPhoradendron serotinum ssp. tomentosumoak mistletoe1MC
305VitVitis girdianawild grape5MC
306ZygLarrea tridentatacreosote bush950
307ZygTribulus terrestris*puncture-vine MC
308AgaHesperoyucca whippleichaparral yucca340
309AgaYucca schidigeraMohave yucca342
310AllAllium fimbriatum var. fimbriatumfringed onion110
311AllAllium peninsulare var. peninsulareMexicali onion3MC
312AreWashingtonia filiferaCalifornia fan palm23
313CypCarex almasturdy sedge1 
314CypCyperus eragrostisumbrella sedge1 
315CypCyperus involucratus*umbrella plant 1
316CypEleocharis geniculatabent spikerush6 
317JunJuncus mexicanusMexican rush199
318JunJuncus rugulosuswrinkled rush430
319LilCalochortus concolorgolden-bowl mariposa12
320PoaAndropogon glomeratus var. scabriglumissouthwestern bushy bluestem8 
321PoaAristida purpurea var. parishiiParish three-awn1 
322PoaAristida purpurea var. purpureapurple three-awn1 
323PoaArundo donax*giant reed1 
324PoaAvena barbata*slender wild oats999
325PoaBromus diandrus*ripgut brome699
326PoaBromus madritensis ssp. rubens*red brome999
327PoaBromus tectorum*downy brome799
328PoaCynodon dactylon*Bermuda grass5 
329PoaFestuca bromoides*brome fescue1 
330PoaFestuca myuros*rattail fescue3 
331PoaFestuca octoflorasix-weeks fescue4 
332PoaHilaria rigidabig galleta940
333PoaHordeum murinum ssp. glaucum*foxtail barley510
334PoaMelica frutescenstall melica52
335PoaMelica imperfectacoast-range melic35
336PoaMuhlenbergia rigensdeergrass 5
337PoaPennisetum setaceum*fountain grass430
338PoaPoa secunda ssp. secundaone-sided bluegrass91
339PoaPolypogon australis*Chilean beard grass2 
340PoaPolypogon monspeliensis*rabbits-foot grass311
341PoaPolypogon viridis*green bentgrass6 
342PoaSchismus barbatus*Mediterranean schismus999
343PoaStipa coronatagiant needlegrass31
344PoaStipa hymenoidesIndian ricegrass960
345PoaStipa parishii var. parishiiParish's needlegrass 1
346PoaStipa speciosadesert needlegrass620
347TheDichelostemma capitatum ssp. capitatumblue dicks799
348TheMuilla maritimamuilla41
349TypTypha domingensissouthern cattail150

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

Go to:

Copyright © 2017 by Tom Chester, Michael Charters, RT Hawke, Shaun Hawke, Keir Morse, Nancy Accola, Adrienne Ballwey, Dave Stith, Tracy Albrecht, Mike Crouse, and Vince Balch.
Permission is freely granted to reproduce any or all of this page as long as credit is given to us at this source:
Comments and feedback: Tom Chester
Last update: 10 January 2018