Flora of the southern Boy Scout Trail Area, Joshua Tree National Park

This flora was compiled from vouchers, iNaturalist observations, and from "five-plus" days of fieldwork in November 2017, after this area had received monsoonal rain eight weeks earlier on the weekend of 10 September 2017.

Fig. 1 shows the southern Boy Scout Trail Area, along with areas we surveyed in November 2017.

Fig. 1. Topo map showing the southern Boy Scout Trail Area in the NW part of Joshua Tree National Park. Surveyed areas are shown by the solid red and solid green lines. Only the area covered by blue and green solid lines, with blue diamonds along them, north of Park Boulevard, are included in this checklist for the Boy Scout Trail. The blue diamonds are GPS locations for species from our surveys.
Click on the image for a larger map.

Fig. 2 shows the locations of species observations from voucher, iNaturalist, and our surveys.

Voucher Locations

iNaturalist locations

Our survey species locations

Our survey paths
Fig. 2. Species locations from vouchers, iNaturalist, and our surveys. Click on the pictures for larger versions.

The fieldwork on 3 November 2017 was along the first part of the Boy Scout Trail, and a short hike south of the Quail Springs Picnic Area, by Tom Chester, Walt Fidler, Mike Crouse, Michael Charters and Bill Bulger.

On 9 November 2017 Michael Charters returned here, and botanized the trail to Willow Hole. On 10 November 2017 RT and Shaun Hawke also botanized the trail to Willow Hole.

On 26 November 2017, Tom Chester, Walt Fidler, Nancy Accola and Joan Barger botanized from the trailhead to Willow Hole. Walt Fidler botanized the area the previous day as well.

There were 172 taxa in the combined list from all of these trips.

See Michael Charters' Photo Gallery from this trail, showing pictures of 83 taxa, and Joan Barger's 107 photographs from 26 November 2017.

A separate page gives a list of the species observed in bloom on 3 November 2017, along with some pictures of some of the plants in bloom.

Georeferenced vouchers were searched at the Consortium of California Herbaria on 1 November 2017, in the rectangle from 34.03 to 34.12° N. Latitude, and -116.23 to -116.17° E. Longitude. The voucher of Quercus turbinella was taken as a voucher of Q. cornelius-mulleri, since the name of Q. turbinella was misapplied to these plants before the recognition of Q. cornelius-mulleri. No attempt was made to check for reasonableness of most of the determinations. 269 vouchers were retrieved, of 145 species.

Subsequently, vouchers from north of 34.07° N. Latitude were removed from the list, in order to restrict this checklist to the part of the Boy Scout Trail Area from the trailhead to Willow Hole. 128 taxa from vouchers remained after restricting the area. Of those 128 vouchered taxa, 71 were ones not seen in our field surveys.

iNaturalist was searched for roughly the same area. Five species were removed from the list from iNaturalist:

INaturalist observations contributed 48 taxa not present in the voucher flora. 41 of those taxa were seen in our fieldwork, with 7 of those taxa being the only record of a species in this area.

The reader can see the pictures of the iNaturalist species, and some of the vouchered species, totaling 126 species, at iNaturalist. This link uses the "Place" I've defined called the Boy Scout Trail Area.

One additional taxon, Eschscholzia papastillii, was added to the list since the range map for this newly-defined species (Still 2014) includes this area, and another, Astragalus coccineus, was added from a photo from a Sierra Club trip here in spring 2017 kindly sent to Michael Charters by Ginny Herringer.

The total checklist for the Boy Scout Area contains 252 taxa.

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 found in the southern Boy Scout Trail Area, as delineated above. Species found only at Willow Hole in vouchers are marked with WH instead of the number of vouchers. If there were no vouchers of a taxon, but it was given in iNaturalist, the column contains iN. As mentioned above, one species, Eschscholzia papastillii, was added from a range map, and has IR in this column, standing for In Range, and another species, Astragalus coccineus, was added from a Sierra Club trip in spring 2017, and has SC in this column.

The column with header #Pls gives the minimum number of plants, up to a maximum of 99 plants for each species, in the area of the Boy Scout Trail observed on 3, 25 and 26 November 2017. The number of plants do not include plants seen near the Quail Springs Picnic Area. A few species found only by Michael Charters, or RT and Shaun Hawke, have no abundance estimate given, and are noted with MC or RT in this column. In many cases both of them reported a species, so we arbitrarily assigned it to one or the other. One additional species found so far only near the Quail Spring Picnic Area, Erigeron breweri var. porphyreticus, is noted with QS in this column.

One species, Chenopodium fremontii, has a "~" on its number of plants, indicating that we are not certain of the determination. We took it as that species in the field, but did not carefully examine the plants to distinguish it from C. album, which is vouchered from there.

Although the checklist lists both Astragalus lentiginosus var. fremontii and var. variabilis, we suspect the plants here are actually intermediates between the two varieties, and hence there is only one taxon here. The plants are then artificially split into those two varieties, which are separated solely by the length of the keel and the density of hairs on the fruit. But this is just a suspicion; we have made no measurements to confirm this.

Since this survey was not done in the spring of a good year, most of the annuals and some of the perennials were either not observed at all, or have much lower numbers recorded than would have been seen in such a spring survey

Version for printing, without 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
1PteCheilanthes covilleibeady lipfern120
2PtePellaea mucronata var. mucronatabird's-foot fern12
3CupJuniperus californicaCalifornia juniperiN72
4EphEphedra nevadensisNevada ephedra399
5PinPinus monophyllapinyon pine150
6AizTrianthema portulacastrumhorse-purslane1 
7AmaAmaranthus fimbriatusfringed amaranthiN99
8AnaRhus aromaticabasketbush299
9ApiLomatium mohavenseMojave lomatium17
10ApoAmsonia tomentosawoolly amsonia438
11ApoAsclepias fascicularisnarrow-leaf milkweed 2
12ApoFunastrum utahenseUtah vine milkweed1 
13AstAcamptopappus sphaerocephalus var. sphaerocephalusgoldenhead199
14AstAdenophyllum cooperiCooper's dogweed199
15AstAdenophyllum porophylloidesSan Felipe dogweed17
16AstAmbrosia acanthicarpabur-ragweediN99
17AstAmbrosia dumosaburroweed 2
18AstAmbrosia salsola var. salsolacheesebushiN99
19AstArtemisia dracunculuswild tarragon 99
20AstArtemisia ludoviciana ssp. incomptamountain mugwort 99
21AstBaccharis brachyphyllashort-leaved baccharis 3
22AstBaccharis sergiloidesdesert baccharis 99
23AstBahiopsis parishiiParish's goldeneye199
24AstBaileya pleniradiatawoolly marigold120
25AstBebbia juncea var. asperasweetbushiN2
26AstBrickellia atractyloides var. argutaCalifornia spear-leaved brickellia299
27AstBrickellia californicaCalifornia brickellbush 7
28AstBrickellia desertorumdesert brickellia 79
29AstBrickellia incanawoolly brickellia2 
30AstChaenactis fremontiiFremont pincushion11
31AstChaenactis stevioidesdesert pincushion123
32AstChaenactis xantianaXantus' chaenactis1 
33AstCirsium neomexicanumdesert thistle 52
34AstEncelia actoniActon encelia 40
35AstEricameria cooperi var. cooperiCooper's goldenbush399
36AstEricameria cuneata var. spathulatawide-leaved rock goldenbush199
37AstEricameria linearifolianarrowleaf goldenbush250
38AstEricameria nauseosa var. mohavensisMohave common rabbitbrush 1
39AstEricameria teretifolianeedle-leaved rabbitbrush 99
40AstErigeron breweri var. porphyreticusBrewer's fleabane QS
41AstErigeron canadensishorseweed 1
42AstErigeron foliosus var. foliosusleafy daisy 14
43AstEriophyllum pringleiPringle's woolly sunflower1 
44AstEriophyllum wallacei var. wallaceiWallace's woolly daisyiN46
45AstGnaphalium palustrewestern marsh cudweed 11
46AstGutierrezia microcephalasticky snakeweed199
47AstLactuca serriola*prickly lettuce 10
48AstLayia glandulosawhite tidy-tips2 
49AstMalacothrix glabratadesert dandelioniN97
50AstMalacothrix stebbinsiiStebbins' malacothrix1 
51AstMonoptilon bellidiformedesert star1 
52AstNicolletia occidentaliswestern nicolletia199
53AstPectis papposa var. papposachinch-weediN99
54AstPleurocoronis plurisetaarrow-leaf 13
55AstPseudognaphalium canescenswhite everlasting115
56AstPseudognaphalium luteoalbum*common cudweedWH 
57AstRafinesquia californicaCalifornia chicory2 
58AstSenecio vulgaris*common groundselWH 
59AstSonchus asper ssp. asper*prickly sow thistle 99
60AstSonchus oleraceus*sow thistleWH 
61AstStephanomeria exigua ssp. exiguaslender wreathplant 99
62AstStephanomeria pauciflorawire-lettuce 12
63AstTetradymia axillaris var. longispinacatclaw horsebrush1 
64AstTetradymia stenolepisMojave horsebrush 99
65AstXanthium strumariumcocklebur 99
66BorAmsinckia tessellata var. tessellatabristly fiddleneckiN99
67BorCryptantha barbigera var. barbigerabearded cryptantha115
68BorCryptantha barbigera var. fergusoniaeSanta Rosa Mountain bearded cryptantha1 
69BorCryptantha circumscissa var. circumscissacushion cryptantha299
70BorCryptantha dumetorumbush-loving cryptantha2 
71BorCryptantha micrantha var. micranthared-root cryptantha1 
72BorCryptantha pterocarya var. pterocaryawing-nut cryptantha1 
73BorCryptantha utahensisscented cryptantha1 
74BorEmmenanthe penduliflora var. penduliflorawhispering bellsiN 
75BorNama demissa var. demissapurple matiN 
76BorPectocarya setosamoth combseed1 
77BorPhacelia campanularia ssp. vasiformisdesert bluebellsiN56
78BorPhacelia cryptanthalimestone phacelia1 
79BorPhacelia distanscommon phacelia399
80BorPhacelia fremontiiFremont's phacelia1 
81BorPholisma arenariumsand plantiN2
82BraBoechera glaucovalvulablue-podded rock-cress7 
83BraBoechera perennansperennial rock-cress118
84BraBoechera xylopodaslender & beautiful rock-cress1 
85BraCaulanthus cooperiCooper's jewel-flower2 
86BraDescurainia pinnatawestern tansy-mustard199
87BraDithyrea californicaspectacle-podWHMC
88BraDraba cuneifoliawedge-leaved draba1 
89BraLepidium fremontiidesert pepper-grass15
90BraLepidium lasiocarpum ssp. lasiocarpumhairy-podded pepper-grass199
91BraSisymbrium altissimum*tumble-mustard199
92BraStanleya pinnata var. pinnataprince's plumeiN7
93BraStreptanthus campestrissouthern jewel-flower1 
94BraThysanocarpus curvipesfringe-pod1 
95CacCylindropuntia echinocarpasilver chollaiN99
96CacCylindropuntia ramosissimapencil cholla299
97CacEchinocereus engelmanniiEngelmann's hedgehog cactusiN80
98CacEchinocereus mojavensisclaret cup475
99CacFerocactus cylindraceusCalifornia barrel cactus273
100CacGrusonia parishiimat cholla1 
101CacOpuntia basilaris var. basilarisbeavertail cactusiN99
102CacOpuntia chloroticapancake prickly-pear 43
103CacOpuntia phaeacanthadesert prickly-pear 16
104CanCeltis reticulatanet-leaf hackberry 6
105CheAtriplex canescens var. canescensfour-wing saltbushiN99
106CheChenopodium album*white goosefootWH 
107CheChenopodium fremontiiFremont's goosefoot ~99
108CheGrayia spinosahop-sage5 
109CheSalsola tragus*Russian thistleiN26
110ConCuscuta denticulatadesert dodder199
111ConCuscuta subinclusacanyon dodder 3
112CraDudleya saxosa ssp. aloidesdesert dudleya218
113CucBrandegea bigeloviidesert star-vineiN2
114CucCucurbita palmatacoyote melon 1
115EriArctostaphylos glaucabigberry manzanita1 
116EupChamaesyce albomarginatarattlesnake weediN99
117EupChamaesyce micromeraSonoran spurgeiN99
118EupChamaesyce setilobastarfish (Yuma) spurgeiN99
119EupCroton californicusCalifornia croton1MC
120FabAcmispon americanus var. americanusSpanish cloverWH 
121FabAcmispon maritimus var. brevivexillusshort-bannered coastal lotus1 
122FabAcmispon rigidusdesert lotus170
123FabAstragalus acutirostrisbeaked rattle-weed1 
124FabAstragalus coccineusscarlet milk-vetchSC 
125FabAstragalus lentiginosus var. fremontiiFremont's milk-vetch2 
126FabAstragalus lentiginosus var. variabilisfreckled milk-vetch299
127FabAstragalus palmeriPalmer's milk-vetch 5
128FabLupinus andersoniiAnderson's lupine47
129FabLupinus concinnus ssp. orcuttiibajada lupine12
130FabLupinus excubitus var. excubitusgrape-soda lupine1 
131FabLupinus sparsiflorusCoulter's lupine3 
132FabProsopis glandulosa var. torreyanahoney mesquiteiN30
133FabSenegalia greggiicatclawiN99
134FabTrifolium microcephalumsmall-head field cloverWH 
135FabTrifolium variegatum var. variegatumvariegated cloverWH 
136FagQuercus cornelius-mulleridesert scrub oak199
137FagQuercus john-tuckeriTucker's oak1 
138FagQuercus lobata X Quercus cornelius-mullerivalley oak x desert scrub oak1 
139GerErodium cicutarium*redstem filareeiN99
140KraKrameria bicolorwhite rhatanyiN2
141KraKrameria erectaPima rhatany199
142LamMonardella robisoniiRobison's monardella2120
143LamSalvia columbariaechiaiN99
144LamSalvia dorrii var. pilosahairy sage1 
145LamSalvia mohavensisMojave sage129
146LamScutellaria mexicanaMexican bladder sage199
147LoaMentzelia albicauliswhite-stemmed blazing star 10
148LoaMentzelia nitensshining blazing star1 
149MalSphaeralcea ambigua var. ambiguaapricot mallowiN99
150MolMollugo cerviana*carpet-weediN99
151NycAbronia villosa var. villosahairy sand-verbenaiNMC
152NycBoerhavia coulteri var. palmeriCoulter's spiderling 99
153NycMirabilis albidadwarf four-o'clockWH 
154NycMirabilis laevis var. villosaBigelow's desert four-o'clockiN99
155OleForestiera pubescensdesert olive 10
156OleFraxinus velutinavelvet ash1 
157OleMenodora scabra var. glabrescensbroom twinberry1 
158OleMenodora spinescens var. mohavensisspiny desert olive1 
159OnaCamissonia campestris ssp. campestrisfield suncup2 
160OnaCamissoniopsis pallida ssp. pallidapale suncup1 
161OnaChylismia claviformis ssp. aurantiacabrown-eyed primroseiN99
162OnaEpilobium canum ssp. latifoliummountain California-fuchsia 99
163OnaOenothera californicaCalifornia evening-primroseiN 
164OnaOenothera deltoides ssp. deltoidesdune primrose 99
165OroCastilleja chromosanorthwestern paintbrush2 
166OroCordylanthus rigidus ssp. setigerbristly bird's beak130
167PapEschscholzia androuxiiJoshua Tree poppyiN 
168PapEschscholzia minutiflorasmall-flowered poppy 4
169PapEschscholzia papastilliicryptic desert poppyIR 
170PapEschscholzia parishiiParish's poppyiN 
171PapPlatystemon californicuscream cups1 
172PhrMimulus aurantiacus var. pubescenshairy bush monkeyflower327
173PhrMimulus bigelovii var. bigeloviiBigelow's monkeyfloweriN 
174PhrMimulus guttatuscommon monkeyflower 99
175PhrMimulus pilosusfalse monkeyflower 25
176PlaKeckiella antirrhinoides var. microphyllalittle-leaved chaparral beardtongue339
177PlaPenstemon clevelandii var. mohavensisMojave beardtongue44
178PlaPenstemon eatonii var. undosusEaton's penstemonWH 
179PlaPenstemon thurberiThurber's beardtongue8 
180PolEriastrum eremicum ssp. eremicumdesert woolly-star199
181PolGilia sinuatarosy gilia1 
182PolGilia stellatastar gilia2 
183PolLeptosiphon aureus ssp. aureusgolden linanthus1 
184PolLinanthus bigeloviiBigelow's linanthus1 
185PolSaltugilia latimeriLatimer's woodland-gilia1 
186PolCentrostegia thurberired triangles36
187PolEriogonum angulosumangled-stem buckwheat299
188PolEriogonum brachyanthumshort-flowered buckwheat341
189PolEriogonum davidsoniiDavidson's buckwheat130
190PolEriogonum fasciculatum var. flavovirideCalifornia buckwheat299
191PolEriogonum fasciculatum var. polifoliumCalifornia buckwheat 99
192PolEriogonum inflatumdesert trumpetiN99
193PolEriogonum nidulariumbirdnest buckwheat199
194PolEriogonum plumatellayucca buckwheatiN99
195PolEriogonum pusillumyellow-turbansWH 
196PolEriogonum saxatilerock buckwheat136
197PolEriogonum wrightii var. membranaceumWright's buckwheatiN99
198PolRumex hymenosepaluswild rhubarb1MC
199PorPortulaca halimoidesdesert portulaca 99
200RanClematis paucifloravirgin's bowerWH10
201RanDelphinium parishii ssp. parishiiParish's larkspur299
202RhaRhamnus ilicifoliahollyleaf redberryiN7
203RosCercocarpus betuloides var. betuloidesbirch-leaf mountain-mahogany2 
204RosColeogyne ramosissimablack brushiN99
205RosIvesia saxosarock ivesia49
206RosPrunus fasciculata var. fasciculatadesert almond699
207RosPurshia tridentata var. glandulosadesert bitterbrush 25
208RubGalium angustifolium ssp. gracillimumslender bedstraw26
209RubGalium aparinecommon bedstrawWH 
210RubGalium stellatumstar-flowered bedstraw1 
211RutThamnosma montanaturpentine broom1 
212SalSalix gooddingiiblack willow 1
213SalSalix laevigatared willowWH7
214SimSimmondsia chinensisjojobaiN85
215SolDatura wrightiisacred datura 59
216SolLycium andersoniiAnderson's boxthorn199
217SolLycium cooperiCooper's boxthorn499
218SolNicotiana obtusifoliadesert tobacco 99
219SolPhysalis crassifoliathick-leaved ground cherryiN9
220VisPhoradendron bolleanumdense mistletoe11
221VisPhoradendron californicumdesert mistletoeiN99
222VisPhoradendron serotinum ssp. tomentosumoak mistletoe 1
223ZygLarrea tridentatacreosote bush199
224AgaYucca brevifoliajoshua tree299
225AgaYucca schidigeraMohave yucca199
226AllAllium fimbriatum var. fimbriatumfringed onion1 
227AllAllium parishiiParish's onion2 
228CypEleocharis macrostachyacommon spikerushWH99
229JunJuncus mexicanusMexican rush 30
230LilCalochortus kennedyi var. kennedyired mariposa17
231PoaAristida purpurea var. purpureapurple three-awn199
232PoaBothriochloa barbinodiscane bluestem 70
233PoaBouteloua barbata var. barbatasix-weeks gramaiN2
234PoaBouteloua curtipendulaside-oats grama 20
235PoaBromus diandrus*ripgut brome 20
236PoaBromus madritensis ssp. rubens*red bromeiN99
237PoaDasyochloa pulchellafluff grass 99
238PoaDistichlis spicatasaltgrassWH 
239PoaEchinochloa crus-galli*barnyard grassWH 
240PoaEragrostis pectinacea var. pectinaceatufted lovegrass 99
241PoaFestuca myuros*rattail fescueWH 
242PoaHilaria rigidabig galleta199
243PoaMelica frutescenstall melica12
244PoaMelica imperfectacoast-range melic1 
245PoaMuhlenbergia porteriPorter's muhly 99
246PoaMuhlenbergia rigensdeergrass 99
247PoaPolypogon maritimus*Mediterranean beard grassWH 
248PoaPolypogon monspeliensis*rabbits-foot grassWH 
249PoaStipa hymenoidesIndian ricegrass220
250PoaStipa speciosadesert needlegrass 50
251RusNolina parryiParry's nolina480
252TheDichelostemma capitatumblue dicksiN 

Voucher data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/; 1 November 2017).

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Copyright © 2017 by Tom Chester, Walt Fidler, Mike Crouse, Michael Charters, Nancy Accola, RT Hawke, Shaun Hawke, and Bill Bulger.
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: 29 November 2017