Flora of the Mt. Wilson Trail, San Gabriel Mountains

Species Notes
The Flora


This flora is for the Mt. Wilson Trail from its southern end in Sierra Madre to its northern end at Mt. Wilson, including the branch that goes through First Water and the helipad. For a map of the trail, and a good description, with abundant pictures, see Drew Robinson's Hiking Mt. Wilson Trail To The Mt. Wilson Observatory via Sierra Madre.

This flora was made from a voucher search of the Consortium of California Herbaria on 10 May 2018; a field trip by Tom Chester and Michael Charters on 27 January 2005 of the lowest 1.5 miles; and numerous field trips by Michael Charters from 2005 to 2018. This flora includes some of the species found along the trail in the residential section at the southern end, some of which may have been planted at the trail environs.

Vouchers. A geographic coordinate search, for vouchers with coordinates, was made for the region of 34.16 to 34.23° north latitude and -118.07 to -118.04° east longitude. No separate search was made for non-georeferenced vouchers. Vouchers not georeferenced in the vicinity of the Mt. Wilson Trail itself were tossed. The locality was examined for the remaining vouchers, and only vouchers with localities that placed them on the Trail were kept. A few species came from vouchers whose locality just said summit of Mt. Wilson, and have been retained on the list for now. They will be removed in the future if they are not found on the trail.

Photographs. For pictures of all the species photographed by Michael Charters, see Flora of the Mt. Wilson Trail: A Slide Show and Michael's Plant List that has direct links to his pictures for each species. Links will eventually be added to this flora directly to Michael's photographs.

See also these photo galleries by Michael from individual trips:

Species Notes

The Phacelia imbricata plants in the San Gabriel Mountains do not perfectly fit either subspecies or variety. The expert, Lawrence R. Heckard, placed these mostly into his "intergrade group I" in his 1960 monograph (Univ. Calif. Publ. Botany 32:1-126), with some in his "intergrade group III", and wrote:

In all three groups the narrow calyx lobe is present and is important owing to the association of this character as a regular feature (and key character) of ssp. patula. The plants of group I are largely like those of ssp. imbricata in other characteristics.

The plants of group III show the greatest similarity to ssp. patula. These could be arranged in a morphological series showing a gradual transition from the somewhat reduced and slender plants of ssp. imbricata of the Mt. Pinos area to plants of the San Gabriel Mountains intermediate between ssp. imbricata and ssp. patula.

p. 43

The Flora

This flora contains 295 taxa as of 26 May 2018. Of those 295:


An asterisk before the common name indicates a non-native species.

The family name is abbreviated to the first three characters in order to save space in the table rows.

The column with header #V gives the number of vouchers for Trail, truncated at a maximum number of nine. If the column contains iNat, it indicates a species from iNaturalist that was not vouchered, nor seen by Michael Charters.

The column with header MC indicates a species photographed by Michael Charters.

Species with no entry in either column are from the field survey on 27 January 2005, except for Cryptantha muricata var. jonesii, as mentioned above.

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-moss3x
2BleWoodwardia fimbriatagiant chain fern x
3DryDryopteris argutaCalifornia wood fern3x
4DryPolystichum imbricans ssp. curtumcliff sword fern x
5PolPolypodium californicumCalifornia polypody5x
6PteAdiantum aleuticumfive-fingered fern x
7PteAspidotis californicaCalifornia lace fern6x
8PteCheilanthes covilleibeady lipfern1x
9PtePellaea andromedifoliacoffee fern3x
10PtePellaea mucronata var. mucronatabird's-foot fern x
11PtePentagramma triangularis ssp. triangularisgoldback fern x
12CupCalocedrus decurrensincense-cedar x
13PinPinus halepensis*Aleppo pine  
14PinPseudotsuga macrocarpabigcone-spruce1x
15LauUmbellularia californicaCalifornia bay9x
16AdoSambucus nigra ssp. caeruleablue elderberry1x
17AnaMalosma laurinalaurel sumac3x
18AnaRhus ovatasugar bush8x
19AnaToxicodendron diversilobumpoison oak2x
20ApiAnthriscus caucalis*bur chervil1x
21ApiOsmorhiza brachypodaCalifornia sweet-cicely2x
22ApiTauschia argutasouthern tauschia2x
23ApoNerium oleander*oleander x
24ApoVinca major*greater periwinkle x
25AraAralia californicaelk's clover1 
26AraHedera helix*English ivy x
27AstAchillea millefoliumyarrow x
28AstAcourtia microcephalapurple head x
29AstAgeratina adenophora*eupatory x
30AstAgoseris retrorsaspear-leaved mountain dandelion x
31AstAmbrosia acanthicarpabur-ragweed x
32AstArtemisia californicaCalifornia sagebrush4x
33AstArtemisia douglasianamugwort x
34AstBaccharis salicifolia ssp. salicifoliamule fat x
35AstBidens pilosa*common beggar-ticks x
36AstBrickellia californicaCalifornia brickellbush2x
37AstBrickellia neviniiNevin's brickellia3x
38AstCarduus pycnocephalus ssp. pycnocephalus*Italian thistle x
39AstCentaurea melitensis*tocalote x
40AstChaenactis artemisiifoliameally white pincushion x
41AstChaenactis glabriuscula var. glabriusculayellow pincushion x
42AstCirsium occidentale var. occidentalecobwebby thistle x
43AstCorethrogyne filaginifoliaCalifornia-aster x
44AstCosmos bipinnatus*garden cosmos x
45AstCotula australis*Australian brass-buttons x
46AstDelairea odorata*German ivy x
47AstEricameria cuneata var. cuneatarock goldenbush x
48AstEricameria parishii var. parishiiParish's goldenbush1x
49AstErigeron bonariensis*little horseweed x
50AstErigeron foliosus var. foliosusleafy daisy1x
51AstEriophyllum confertiflorum var. confertiflorumgolden yarrow x
52AstHazardia squarrosa var. grindelioidessaw-toothed goldenbush4x
53AstHelianthus annuusannual sunflower  
54AstHeterotheca grandifloratelegraph weed1 
55AstHieracium argutumsouthern hawkweed x
56AstLactuca serriola*prickly lettuce x
57AstLayia glandulosawhite tidy-tips x
58AstLogfia gallica*narrowleaf filago x
59AstMalacothrix saxatilis var. tenuifoliashort-leaved cliff-aster x
60AstPseudognaphalium beneolensfragrant everlasting x
61AstPseudognaphalium biolettiibicolored everlasting x
62AstPseudognaphalium californicumCalifornia everlasting3x
63AstPseudognaphalium microcephalumwhite everlasting3x
64AstRafinesquia californicaCalifornia chicory1x
65AstSenecio astephanusSan Gabriel ragwort4 
66AstSenecio flaccidus var. douglasiibush senecio8x
67AstSenecio vulgaris*common groundsel x
68AstSolidago velutina ssp. californicagoldenrod x
69AstSonchus oleraceus*sow thistle x
70AstStephanomeria cichoriaceachicory-leaved stephanomeria3x
71AstStephanomeria virgata ssp. virgatatwiggy wreath plant x
72BetAlnus rhombifoliawhite alder1x
73BorAmsinckia intermediacommon fiddleneck x
74BorCryptantha flaccidaflaccid cryptantha x
75BorCryptantha intermedia var. intermediapopcorn flower2 
76BorCryptantha microstachysTejon cryptantha x
77BorCryptantha muricata var. denticulataprickly-nut cryptantha ~
78BorCryptantha muricata var. jonesiiJones' prickly-nut cryptantha x
79BorCryptantha muricata var. muricatashowy prickly-nut cryptantha x
80BorEmmenanthe penduliflora var. penduliflorawhispering bells x
81BorEriodictyon crassifolium var. crassifoliumthick-leaved yerba santa2 
82BorEriodictyon crassifolium var. nigrescensthick-leaved yerba santa2 
83BorEriodictyon parryipoodle-dog bush x
84BorEriodictyon trichocalyx var. trichocalyxsmoothleaf yerba santa x
85BorEucrypta chrysanthemifolia var. chrysanthemifoliaeucrypta3x
86BorNemophila menziesii var. integrifoliababy blue eyes x
87BorNemophila menziesii var. menziesiibaby blue eyes1 
88BorPhacelia brachylobashort-lobed phacelia x
89BorPhacelia cicutaria var. hispidacaterpillar phacelia1x
90BorPhacelia distanscommon phacelia x
91BorPhacelia grandifloragiant-flowered phacelia1x
92BorPhacelia imbricataimbricate phacelia x
93BorPhacelia minorwild canterbury bells1x
94BorPhacelia ramosissimabranching phacelia1x
95BorPholistoma auritum var. auritumfiesta flower x
96BraBoechera arcuataarched elegant rock-cress x
97BraCapsella bursa-pastoris*shepherd's purse x
98BraCardamine oligospermabittercress2x
99BraCaulanthus heterophyllusslender-pod jewelflower1 
100BraCaulanthus lasiophyllusCalifornia mustard x
101BraErysimum capitatum var. capitatumwestern wallflower x
102BraHirschfeldia incana*shortpod mustard x
103BraLepidium didymum*lesser swine cress1 
104BraLepidium virginicum ssp. menziesiiwild pepper-grass x
105BraLobularia maritima*sweet alyssum1x
106BraSisymbrium altissimum*tumble-mustard x
107BraSisymbrium officinale*hedge mustard x
108BraSisymbrium orientale*Oriental mustard x
109BraThysanocarpus laciniatuslace-pod x
110BraTurritis glabratower mustard x
111CacOpuntia ficus-indica*mission cactus x
112CacPeniocereus serpentinus*Mexican Night-Blooming Cereus x
113CapLonicera subspicata var. denudatasouthern honeysuckle5x
114CapSymphoricarpos molliscreeping snowberry4 
115CarPolycarpon tetraphyllum var. tetraphyllum*four-leaf polycarp2 
116CarSilene gallica*windmill pink3x
117CarSilene laciniata ssp. laciniatasouthern Indian pink2x
118CarSilene parishiiParish's campion x
119CarStellaria media*common chickweed x
120CheChenopodium murale*nettle-leaved goosefootiNat 
121CheDysphania pumilio*clammy goosefoot1 
122CisHelianthemum scoparium var. vulgarerush-rose5 
123ConCalystegia macrostegia ssp. aridasouthern California morning-glory2x
124ConCuscuta californica var. californicaCalifornia dodder x
125ConCuscuta subinclusacanyon dodder x
126CraCrassula ovata*jade plant1 
127CraDudleya cymosa ssp. pumilacanyon dudleya4x
128CraDudleya lanceolatalanceleaf dudleya1x
129CucMarah macrocarpawild-cucumber x
130EriArbutus menziesiimadrono9x
131EriArctostaphylos glandulosa ssp. glandulosaEastwood manzanita3 
132EriArctostaphylos glandulosa ssp. mollisTransverse Range manzanita x
133EriArctostaphylos glaucabigberry manzanita5x
134EupChamaesyce melanadeniared-gland spurge x
135EupEuphorbia peplus*petty spurge x
136EupRicinus communis*castor bean2x
137FabAcacia baileyana*Cootamundra wattle1~
138FabAcacia redolens*bank catclaw1 
139FabAcmispon argophyllus var. argophyllussouthern California silver-lotus6 
140FabAcmispon glaber var. brevialatusshort-winged deerweed2x
141FabAcmispon glaber var. glaberdeerweed x
142FabAcmispon grandiflorus var. grandifloruschaparral lotus x
143FabAcmispon heermannii var. heermanniisilky lotus1 
144FabAcmispon maritimus var. maritimuscoastal lotus2x
145FabAcmispon nevadensis var. davidsoniiDavidson's lotus1x
146FabAcmispon strigosusstrigose lotus x
147FabAmorpha californica var. californicaCalifornia false-indigo8x
148FabBituminaria bituminosa*Arabian pea6x
149FabLathyrus vestitus var. vestituswild sweetpea2x
150FabLupinus hirsutissimusstinging lupine x
151FabLupinus longifoliuslong-leaf bush lupine6x
152FabLupinus sparsiflorusCoulter's lupine x
153FabLupinus truncatuscollar lupine3x
154FabMedicago polymorpha*California burclover x
155FabRupertia physodescommon rupertia1 
156FabSpartium junceum*Spanish broom x
157FabTrifolium hirtum*rose clover1x
158FabTrifolium microcephalumsmall-head field clover1 
159FagQuercus agrifolia var. agrifoliacoast live oak4x
160FagQuercus chrysolepiscanyon live oak5x
161FagQuercus durata var. gabrielensisSan Gabriel Mtns. leather oak9x
162FagQuercus durata var. gabrielensis X Q. engelmanniiEngelmann - leather oak hybrid3 
163FagQuercus engelmanniiEngelmann oak9 
164FagQuercus wislizeni var. frutescensinterior live oak2 
165GerErodium cicutarium*redstem filaree x
166GerErodium moschatum*white-stemmed filaree  
167GroRibes amarumbitter gooseberry8 
168GroRibes californicum var. hesperiumhillside gooseberry3x
169GroRibes malvaceum var. viridifoliumchaparral currant5x
170GroRibes roezlii var. roezliiSierra gooseberry1 
171JugJuglans californicaSouthern California black walnut x
172LamLepechinia fragransfragrant pitcher sage3 
173LamMarrubium vulgare*horehound x
174LamRosmarinus officinalis*rosemary x
175LamSalvia apianawhite sage x
176LamSalvia clevelandiiCleveland sage ?
177LamSalvia columbariaechia x
178LamSalvia melliferablack sage4x
179LamStachys albenscobwebby hedge-nettle2 
180LamStachys bullatasouthern hedge-nettle2 
181LoaMentzelia laevicaulisgiant blazing star x
182LoaMentzelia micranthachaparral blazing star2x
183MalMalva parviflora*cheeseweed x
184MonCalyptridium monandrumsand cress x
185MonClaytonia perfoliata ssp. intermontanaminer's lettuce2 
186MonClaytonia perfoliata ssp. mexicanasouthern miner's lettuce x
187MonClaytonia perfoliata ssp. perfoliataminer's lettuce x
188MyrAnagallis arvensis*scarlet pimpernel  
189MyrEucalyptus polyanthemos*silver dollar gum2 
190NycMirabilis laevis var. crassifoliaCalifornia four o'clock x
191OnaCamissoniopsis confusaSan Bernardino suncup x
192OnaClarkia bottaepunch-bowl godetia1x
193OnaClarkia epilobioidescanyon clarkia1x
194OnaClarkia unguiculataelegant clarkia2x
195OnaEpilobium canum ssp. canumCalifornia fuchsia2x
196OnaEpilobium canum ssp. latifoliummountain California-fuchsia x
197OnaEpilobium ciliatum ssp. ciliatumwillowherb1 
198OnaEulobus californicusCalifornia suncup1x
199OroCastilleja applegatei ssp. martiniiMartin's paintbrush1x
200OroCordylanthus rigidus ssp. setigerbristly bird's beak x
201OxaOxalis pes-caprae*Bermuda buttercup x
202PaePaeonia californicaCalifornia peony1 
203PapEschscholzia californicaCalifornia poppy x
204PapMeconella denticulatasmall-flowered meconella x
205PapPapaver orientale*Oriental poppy x
206PhrMimulus aurantiacus var. pubescenshairy bush monkeyflower1x
207PhrMimulus brevipeswide-throated yellow monkeyflower x
208PhrMimulus cardinalisscarlet monkeyflower x
209PhrMimulus guttatuscommon monkeyflower x
210PlaAntirrhinum kelloggiitwining snapdragon x
211PlaAntirrhinum multiflorumchaparral snapdragon2 
212PlaCollinsia heterophylla var. austromontanasouthern Chinese houses1x
213PlaCollinsia parryiParry's collinsia x
214PlaDigitalis purpurea*purple foxglove x
215PlaKeckiella cordifoliaheartleaf penstemon2x
216PlaKeckiella ternata var. ternatawhorledleaf penstemon x
217PlaPenstemon centranthifoliusscarlet bugler1x
218PlaPenstemon grinnellii var. grinnelliiGrinnell's beardtongue x
219PlaPenstemon heterophyllus var. australissouthern foothill penstemon1 
220PlaPenstemon spectabilis var. subviscosusshowy penstemon5x
221PolGilia capitata ssp. abrotanifoliaglobe giliaiNatx
222PolLinanthus californicusprickly phlox3x
223PolSaltugilia splendens ssp. grantiiGrant's gilia x
224PolPolygala cornuta var. fishiaeFish's milkwort4 
225PolAcanthoscyphus parishii var. parishiiParish's oxytheca1 
226PolEriogonum davidsoniiDavidson's buckwheat x
227PolEriogonum elongatum var. elongatumlong-stemmed buckwheat3x
228PolEriogonum fasciculatum var. foliolosumCalifornia buckwheat1x
229PolEriogonum fasciculatum var. polifoliumCalifornia buckwheat x
230PolPersicaria hydropiperoideswater pepper3 
231PolPterostegia drymarioidesfairy bowties, threadstem x
232RanClematis lasianthavirgin's bower x
233RanDelphinium cardinalescarlet larkspur x
234RanDelphinium patens ssp. hepaticoideumspreading larkspur7x
235RhaCeanothus crassifolius var. crassifoliushoaryleaf ceanothus3x
236RhaCeanothus cyaneusLakeside ceanothus1 
237RhaCeanothus integerrimus var. macrothyrsusdeer brush1x
238RhaCeanothus leucodermischaparral whitethorn3x
239RhaCeanothus megacarpus var. megacarpusbig-pod ceanothus1 
240RhaCeanothus oliganthus var. oliganthushairy ceanothus9x
241RhaFrangula californica ssp. californicaCalifornia coffeeberry x
242RhaRhamnus ilicifoliahollyleaf redberry5x
243RosAdenostoma fasciculatum var. fasciculatumchamise9x
244RosCercocarpus betuloides var. betuloidesbirch-leaf mountain-mahogany5x
245RosCotoneaster pannosus*woolly cotoneaster1 
246RosDrymocallis glandulosa var. glandulosasticky cinquefoil3~
247RosHeteromeles arbutifoliatoyon6x
248RosPrunus ilicifolia ssp. ilicifoliahollyleaf cherry3x
249RosRubus leucodermiswhite-bark raspberry x
250RosRubus ursinusCalifornia blackberry x
251RubGalium angustifolium ssp. angustifoliumnarrowleaf bedstraw1x
252RubGalium aparinecommon bedstraw x
253RubGalium californicum ssp. flaccidumCalifornia bedstraw3x
254RubGalium grandeSan Gabriel bedstraw9x
255RubGalium johnstoniiJohnston's bedstraw7 
256RubGalium nuttallii ssp. nuttalliiclimbing bedstraw  
257RubGalium porrigens var. porrigensgraceful bedstraw x
258SapAcer macrophyllumbigleaf maple3x
259SapAesculus californicaCalifornia buckeye1 
260SaxBoykinia rotundifoliaround-leaved boykinia3x
261SaxHeuchera elegansurn-flowered alumroot1x
262SaxLithophragma affinewoodland star1x
263SaxLithophragma bolanderiBolander's woodland star1 
264SolNicotiana glauca*tree tobacco2x
265SolSolanum douglasiiwhite nightshade3x
266SolSolanum umbelliferumblue-witch nightshade3 
267SolSolanum xantipurple nightshade x
268VerLantana montevidensis*trailing lantana4x
269VisPhoradendron serotinum ssp. tomentosumoak mistletoe x
270VitVitis girdianawild grape1 
271AgaHesperoyucca whippleichaparral yucca x
272AraZantedeschia aethiopica*calla lily x
273ArePhoenix canariensis*Canary Island date palm3x
274IriChasmanthe floribunda*chasmanthe x
275JunJuncus textilisbasket rush2 
276LilCalochortus albuswhite fairy lantern2x
277LilCalochortus plummeraePlummer's mariposa lily x
278LilLilium humboldtii ssp. ocellatumocellated Humboldt lily x
279PoaAvena barbata*slender wild oats x
280PoaBromus ciliatusfringed brome1 
281PoaBromus diandrus*ripgut brome x
282PoaBromus grandistall brome3 
283PoaBromus hordeaceus*soft chess x
284PoaBromus madritensis ssp. rubens*red brome x
285PoaBromus porterinodding brome1 
286PoaBromus pseudolaevipessouthern chinook brome1 
287PoaCynodon dactylon*Bermuda grass x
288PoaEhrharta erecta*upright veldt grass6 
289PoaElymus condensatusgiant wild-rye4 
290PoaFestuca perennis*Italian rye-grass x
291PoaHordeum murinum*foxtail barley x
292PoaKoeleria macranthaJune grass1 
293PoaLamarckia aurea*goldentop x
294PoaLolium perenne ssp. multiflorum*English rye-grass1 
295PoaMelica imperfectacoast-range melic1x
296PoaMuhlenbergia microspermalittleseed muhly2 
297PoaPoa secunda ssp. secundaone-sided bluegrass6 
298PoaStipa coronatagiant needlegrass1x
299PoaStipa lepidafoothill needlegrass1 
300PoaStipa miliacea var. miliacea*smilo grass1x
301TheDichelostemma capitatum ssp. capitatumblue dicks2x
302TheMuilla maritimamuilla x

Voucher data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/) on 10 May 2018.

Go to:

Copyright © 2018 by Michael Charters and Tom Chester.
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 June 2018