Flora of Jackson Lake Area, San Gabriel Mountains

Table of Contents

     Origin of Jackson Lake
Botanical Highlights
     Aquatic Plants, Distinguishing Characteristics and Photographs
     Drying Lake Area Margin Plants
     Absence of Riparian Plants
Species Notes
The Flora
     Checklist Contents
     Field Survey
     Checklist Numbers
     The Checklist

Fig. 1. View of Jackson Lake from the Jackson Lake Trail. Photo by Tom Chester, taken on 5 September 2015 looking north / northeast. Click on the picture for a larger version.


Jackson Lake is one of the very few natural lakes in the San Gabriel Mountains, and hence contains aquatic plants not seen in the vast majority of the area of the San Gabriels. In fact, one or more of the aquatic species seen here, listed in Table 1 below, are found at only five other georeferenced voucher locations in the San Gabriels: Crystal Lake; Lost Lake (Lone Pine Canyon); confluence of West Fork and North Fork of San Gabriel River; Caldwell Lake; and Lytle Creek Canyon.

Interestingly, although there is a lot of water in Jackson Lake, typical riparian plants are missing from its flora! This testifies that there is something different about the origin of Jackson Lake, from the usual lakes and ponds fed by water from wet drainages.

Origin of Jackson Lake

Jackson Lake has been described as a sag pond, but that is not correct. A sag pond is a feature created by sagging of the land surface that then fills with water. The sagging could be caused by subsidence of land between two branches of an earthquake fault, or by slumping of the top of a landslide area.

Instead, Jackson Lake appears to have been created by simple movement of the upper part of its drainage along the San Andreas Fault to the point where the drainage was blocked by its own drainage divide (see Field Guide to the San Andreas Fault by David Lynch).

Fig. 2 shows a cartoon model of the drainage prior to movement along the fault, and after the fault has moved one bank of its drainage divide enough to block at least partially the upper part of the drainage.

Fig. 2. Cartoon model of how Jackson Lake was probably created in the creek drainage by movement along the San Andreas Fault. The left diagram shows the drainage and its banks (drawn at the drainage divides with the two neighboring drainages) before movement along the Fault. The right diagram shows the right-lateral displacement of the drainage and its banks, with the segment of its own drainage left bank, on the other side of the fault, now blocking the original trend of the upper drainage.

Fig. 3 is a Google Earth view showing that the drainage that goes through Jackson Lake has been offset to the right along the San Andreas Fault, with its former side bank now in line with the upper part of its drainage (see also large scale view from the west). As a result, the creek has had to cut its way through its former side bank. It hasn't been able to cut its bank down quickly enough to prevent a partial blockage of the drainage, forming the lake.

Fig. 3. View of Jackson Lake from the south in Google Earth. Click on the picture for a larger version. See also view from farther above from the west.

Jackson Lake apparently was originally a smaller pond that was enlarged "sometime prior to 1920" by construction of a dam to block the outlet of the pond (see What will happen to Jackson Lake?), which was reinforced soon after the Forest Service took over the area in 1940. The Big Pines Highway (N2) is constructed on top of that dam.

The former outlet of the lake now has an outlet tunnel with a valve that can be opened to drain the lake. The lake was apparently drained in the winter of 2013-2014 after a man died trying to save a child who had fallen through the ice on the surface of the lake.

Botanical Highlights

Aquatic Plants
Drying Lake Area Margin Plants
Absence of Riparian Plants

Aquatic Plants, Distinguishing Characteristics and Photographs

Aquatic plants are clearly the star of the show here. The ones present here, and their distingushing characteristics, are given in Table 1.

There might be a non-vascular plant present at Jackson Lake that is often confused with aquatic flowering plants, Chara, muskgrass or skunkweed. Because of this potential confusion, we've added this to Table 1.

Table 1. The Aquatic Vascular Plant Species of Jackson Lake

All photographs from Calphotos except the first one; click on the pictures for the larger original versions.

Distinguishing CharacteristicsScientific NameCommon NamePhotograph
Not a Vascular Plant, but looks similar to one!

No vascular system; no flowers; always entirely submersed in water; 6-16 whorled branchlets per node; with foul, musty almost garlic-like odor; branchlets often with grainy texture due to calcium deposits (see Weed info - Branched Algae; and Algae and Weed Identification)

Chara speciesmuskgrass, skunkweed
© Tom Chester
Leaves whorled, 3-11 per node, each with 2-4 segments, plant entirely submersed in waterCeratophyllum demersumcoon's tail
© Neal Kramer
Submersed leaves whorled, 3-6 per node, each with up to 28 segments; inflorescence above waterMyriophyllum sp., possibly sibiricumSiberian milfoil
©2001 CDFA
Leaves oppositeZannichellia palustrishorned pondweed
© Neal Kramer
Leaves alternate, leaf blade serrate, inflorescence floating on water or above waterPotamogeton crispus*crispate-leaved pondweed
© Br. Alfred Brousseau, Saint Mary's College
Leaves alternate, leaf blade elliptic to oblanceolate, inflorescence floating on water or above water,Potamogeton illinoensisshining pondweed
© Neal Kramer
Leaves alternate, leaf thread-like, inflorescence under waterStuckenia pectinata (=Potamogeton pectinatus)fennel-leaved pondweed
© Esperanza Pimentel
Leaves alternate, leaf blade linear, inflorescence floating on water or above waterPotamogeton foliosus ssp. foliosusleafy pondweed
© Neal Kramer

Drying Lake Area Margin Plants

The flora of the Jackson Lake area is very unusual. It consists of two nearly-disjunct sets of species. The species found in and around Jackson Lake are for the most part not found elsewhere in the area, and vice versa.

For example, in our survey on 5 September 2015, we found 138 taxa. Of those 138 taxa, 95 were found only on the trail above Jackson Lake; 43 of those taxa were found in, or immediately-around, Jackson Lake; and only five taxa were found in both places!

The checklist below identifies those taxa found only in, and in the drying margins of, Jackson Lake, from our field survey.

Absence of Riparian Plants

The first thing Jane Strong noticed, when she saw the first voucher flora of Jackson Lake presented on this page, was that typical riparian species were missing! In riparian areas in the San Gabriel Mountains, one finds species such as bracken, yarrow, columbine, orchids, Parish's lupine, scarlet and other monkeyflowers, and many additional rush and sedge species.

The unusual origin of Jackson Lake detailed above accounts for the lack of riparian plants. There isn't a high water table here that feeds the lake from typical riparian streams. Instead, the drainages in this area typically carry water only for brief times during rainfall, with the water all rushing to the desert floor to the north. Because of the natural (and unnatural) dam, the water gets trapped here in the lake when there is runoff.

Species Notes

The checklist gives three varieties of Ericameria nauseosa, but there are actually only two distinct varieties here. Var. bernardina is unambiguously distinct, but the other variety is intermediate between var. mohavensis and var. oreophila, and hence sometimes is vouchered under one name, and sometimes under the other name.

The Flora

Checklist Contents

This checklist includes:


The procedure for obtaining the vouchers was as follows.

Vouchers from the Consortium of California Herbaria were searched on 4 September 2015 for all Los Angeles County vouchers with Jackson Lake in their locality, augmented by a search for georeferenced vouchers between 34.38 and 34.40° N. latitude and -117.75 and -117.71° E. longitude. Duplicate vouchers were removed, and vouchers not in the area close to Jackson Lake were removed.

The above procedure resulted in 573 vouchers of 231 taxa. Table 2 lists the top voucher collectors. As is usually the case, Dick Swinney is the #1 voucher collector, responsible for 31% of all the vouchers.

Table 2. Dominant Voucher Collectors

# of Vouchers% of all VouchersCollector
17631%R. G. Swinney
13423%T. S. Ross
7313%R. F. Thorne
488%B. C. Templeton

The vouchers are mostly from Jackson Lake itself and areas within 1.3 miles of Jackson Lake; see map of accepted voucher locations. This map uses the clustering algorithm at the Consortium. The numbers inside the colored circles show the number of vouchers from each cluster. Jackson Lake is at the center of the map, at the red circle showing 147 vouchers.

The seven taxa in Table 3 were rejected from the voucher list for the given reason, leaving 224 vouchered taxa in the checklist.

Table 3. Taxa Rejected from the Voucher List

Scientific NameReason for Rejection
Cupressus arizonica ssp. nevadensisPlanted by the Forest Service at Ball Flat
Ericameria parryiProbable misdetermination
Galium biflorumTypo
Gayophytum nuttalliisee note under Gayophytum diffusum parviflorum in JM eflora: "most small-flowered plants assigned by Munz, others to Gayophytum nuttallii belong here"
Horkelia bolanderiProbable misdetermination
Opuntia basilaris var. treleaseiProbable misdetermination
Penstemon eatoniiProbable misdetermination

Field Survey

A field survey was done on 5 September 2015 of the Jackson Lake Trail, from Jackson Lake to the PCT, including the portion of the area around Jackson Lake near the parking area, by the authors. A total of 138 taxa were observed. Of those 138 taxa, 103 taxa were vouchered from the Jackson Lake area, and 33 taxa were additions to the Jackson Lake Flora.

Checklist Numbers

The total checklist below contains 327 taxa. Of those, a total of 265 taxa are in the checklist from the Jackson Lake area up to the junction of the PCT. An additional 62 taxa are given in the Checklist from surveys of the PCT from Lightning Ridge to Vincent Gap, and from species vouchered in the area of that PCT section. Some of those 62 taxa are probably found in the Jackson Lake area, but many probably are not found there. After further surveys at prime time, we will delete those additional species that have not been found here.

The Checklist

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

The column JL indicates whether a taxon was only found in, or immediately around, Jackson Lake, in the field survey. We have not yet gone through the vouchers to see which additional species are only found in or immediately around Jackson Lake.

The column #V gives the number of vouchers for the Jackson Lake area, with a maximum of 9 vouchers recorded in that field.

The column #Pls gives the number of plants for each observed species on the survey of 5 September 2015, up to a maximum of 99 plants. If there is uncertainty in the determination, the number has a symbol associated with it, ~ for a probable, but not certain, determination, sp (for "species") or ? for more uncertain determinations.

Species with no entry in either of these two colums are taxa found just outside the Jackson Lake Area, and may or may not be found in the Jackson Lake area. They were included to make the checklist more complete for future surveys.

Sequoiadendron giganteum, giant sequoia, has been planted in the campground, and is not native to this area, as is probably Calocedrus decurrens, incense-cedar. It is likely that the two specimens of Pinus coulteri, Coulter pine, found at the beginning of the Jackson Lake Trail, have also been planted. We've marked only the giant sequoia as not-native here since we are not certain about the other two.

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)

# Fam Scientific Name (*)Common Name JL #V #Pls
1EquEquisetum arvensefield horsetail   
2EquEquisetum laevigatumsmooth scouring rush 2 
3PtePellaea mucronata var. californicaCalifornia cliff-brake  1
4PtePellaea mucronata var. mucronatabird's-foot fern   
5CupCalocedrus decurrensincense-cedarJL22
6CupJuniperus californicaCalifornia juniper 1 
7CupSequoiadendron giganteum*giant sequoiaJL 5
8PinAbies concolorwhite fir 250
9PinPinus coulteriCoulter pine  2
10PinPinus jeffreyiJeffrey pine  99
11PinPinus lambertianasugar pine 215
12PinPinus monophyllapinyon pine 14
13PinPinus ponderosa var. pacificaponderosa pine 1 
14CerCeratophyllum demersumcoon's tail 1 
15AdoSambucus nigra ssp. caeruleablue elderberry  5
16AmaAmaranthus albus*tumble pigweedJL399
17AmaAmaranthus blitoides*mat amaranth 1 
18ApiLomatium dissectum var. multifidumfern-leaved lomatium 1~1
19ApiLomatium mohavenseMojave lomatium 1 
20ApiLomatium nevadense var. parishiiParish's lomatium 2 
21ApiOsmorhiza berteroimountain sweet-cicely 2 
22ApiTauschia parishiiParish's tauschia 420
23ApoApocynum androsaemifoliumspreading dogbane   
24ApoAsclepias californicaCalifornia milkweed 610
25AstAgoseris grandiflora var. grandifloragrand mountain dandelion   
26AstAgoseris retrorsaspear-leaved mountain dandelion  ~1
27AstAmbrosia acanthicarpabur-ragweedJL199
28AstAnisocoma acaulisscale-bud   
29AstArtemisia douglasianamugwort 3 
30AstArtemisia dracunculuswild tarragon 230
31AstArtemisia tridentatabig sagebrush 499
32AstChaenactis glabriuscula var. glabriusculayellow pincushion 3 
33AstChaenactis santolinoidessantolina pincushion 130
34AstCirsium occidentale var. californicumCalifornia thistle 25
35AstCorethrogyne filaginifoliaCalifornia-aster   
36AstDieteria canescens var. canescenshoary-aster   
37AstEricameria nauseosa var. bernardinaSan Bernardino rubber rabbitbrush 450
38AstEricameria nauseosa var. mohavensisMohave common rabbitbrush   
39AstEricameria nauseosa var. oreophilathreadleaf common rabbitbrush 21
40AstErigeron canadensishorseweedJL199
41AstErigeron divergensspreading fleabane 2 
42AstErigeron foliosus var. foliosusleafy daisy 350
43AstEriophyllum confertiflorum var. confertiflorumgolden yarrow 130
44AstEuthamia occidentaliswestern goldenrod 1 
45AstGnaphalium palustrewestern marsh cudweed 1 
46AstLactuca serriola*prickly lettuceJL21
47AstLessingia glandulifera var. glanduliferasticky lessingia  1
48AstMalacothrix californicaCalifornia dandelion 2 
49AstMalacothrix glabratadesert dandelion 1 
50AstPackera ionophyllaTehachapi ragwort 210
51AstPleiacanthus spinosusthorny skeleton-plant   
52AstPseudognaphalium thermaleslender everlasting 2 
53AstSenecio flaccidus var. douglasiibush senecio 1 
54AstSolidago velutina ssp. californicagoldenrod 299
55AstSonchus asper ssp. asper*prickly sow thistleJL11
56AstStephanomeria exigua ssp. coronariaslender wreathplant 35
57AstStephanomeria virgatatwiggy wreath plant   
58AstTaraxacum officinale*common dandelionJL31
59AstTetradymia canescensspineless horsebrush  30
60BetAlnus rhombifoliawhite alder 1 
61BorCryptantha affiniscommon cryptantha 1 
62BorCryptantha echinellaprickly cryptantha 1 
63BorCryptantha muricata var. denticulataprickly-nut cryptantha   
64BorCryptantha muricata var. jonesiiJones' prickly-nut cryptantha   
65BorCryptantha muricata var. muricatashowy prickly-nut cryptantha 2 
66BorCryptantha simulanspine cryptantha 7 
67BorEriodictyon parryipoodle-dog bush   
68BorEriodictyon trichocalyx var. trichocalyxsmoothleaf yerba santa  99
69BorNama californicaCalifornia fiddleleaf 1 
70BorPectocarya penicillatacombseed 1 
71BorPhacelia austromontanasouthern Sierra phacelia   
72BorPhacelia bicolor var. bicolortwo-colored phacelia 1 
73BorPhacelia cicutaria var. hispidacaterpillar phacelia 1 
74BorPhacelia curvipescurve-stem phacelia   
75BorPhacelia davidsoniiDavidson's phacelia 4 
76BorPhacelia fremontiiFremont's phacelia 1 
77BorPhacelia imbricataimbricate phacelia 199
78BorPhacelia mohavensisMojave phacelia 2 
79BorPhacelia ramosissimabranching phacelia  7
80BraBarbarea orthoceraswinter cress 6 
81BraBoechera arcuataarched elegant rock-cress   
82BraBoechera californicaCalifornia elegant rock-cress   
83BraBoechera repandaYosemite rockcress 210
84BraBoechera retrofracta Xmountain rock-cress   
85BraCaulanthus amplexicaulisclasping-leaved caulanthus 1 
86BraCaulanthus majorslender wild cabbage 420
87BraDescurainia sophia*herb sophia 1 
88BraErysimum capitatum var. capitatumwestern wallflower 399
89BraHirschfeldia incana*shortpod mustardJL110
90BraLepidium virginicum ssp. menziesiiwild pepper-grassJL22
91BraSisymbrium altissimum*tumble-mustard 3 
92CacOpuntia basilaris var. brachycladashort-joint beavertail 1 
93CapLonicera subspicata var. denudatasouthern honeysuckle  sp10
94CapSymphoricarpos rotundifolius var. parishiiParish's snowberry 14
95CarEremogone macradenia var. arcuifoliadesert sandwort 225
96CarSilene verecundawhite catch-fly 450
97CheAtriplex rosea*tumbling oracle 3 
98CheChenopodium atrovirensforest goosefoot   
99CheChenopodium fremontiiFremont's goosefootJL299
100CheChenopodium leptophyllumthin-leaved goosefoot   
101CheChenopodium murale*nettle-leaved goosefoot 1 
102CheChenopodium pratericolameadow goosefoot   
103CheChenopodium strictum var. glaucophyllum*white-leaved goosefoot   
104CheDysphania botrys*Jerusalem oak 1 
105CheSalsola gobicola*hybrid thistle   
106ConCalystegia occidentalis ssp. fulcratawestern morning-glory 250
107ConCalystegia peirsoniiPeirson's morning-glory   
108ConCuscuta californica var. californicaCalifornia dodder  40
109CorCornus sericea ssp. occidentaliswestern dogwood 1 
110CorCornus sericea ssp. sericeared osier dogwood 3 
111CraDudleya cymosa ssp. pumilacanyon dudleya   
112ElaElaeagnus angustifolia*Russian olive 6 
113EriArctostaphylos patulagreen-leaf manzanita   
114EriSarcodes sanguineasnow-plant 5 
115EupChamaesyce serpyllifolia ssp. serpyllifoliathyme-leafed spurge 3 
116FabAcmispon americanus var. americanusSpanish cloverJL299
117FabAcmispon nevadensis var. davidsoniiDavidson's lotus 330
118FabAcmispon procumbens var. procumbenssilky California broom 43
119FabAstragalus douglasii var. douglasiiJacumba milk-vetch 110
120FabAstragalus lentiginosus var. antoniusSan Antonio milk-vetch   
121FabAstragalus leucolobusBig Bear Valley woollypod 3 
122FabAstragalus purshii var. lectulusPursh's milk-vetch 3 
123FabHosackia crassifolia var. crassifoliabroad-leaved lotus 215
124FabLupinus elatussilky lupine   
125FabLupinus excubitus var. austromontanusmountain grape-soda lupine  30
126FabLupinus formosus var. formosuswestern lupine  2
127FabLupinus hyacinthinusSan Jacinto lupine   
128FabMelilotus albus*white sweetcloverJL199
129FabTrifolium variegatumvariegated clover 1 
130FabTrifolium wormskioldiicows clover 4 
131FagChrysolepis sempervirensbush chinquapin   
132FagQuercus chrysolepiscanyon live oak 299
133FagQuercus john-tuckeriTucker's oak 41
134FagQuercus kelloggiiCalifornia black oak 999
135GarGarrya flavescensashy silk tassel  3
136GenFrasera neglectapine green-gentian 625
137GerErodium cicutarium*redstem filareeJL 20
138GroRibes cereum var. cereumwax currant 52
139GroRibes lasianthumalpine gooseberry 1 
140GroRibes nevadensemountain pink currant 699
141GroRibes roezlii var. roezliiSierra gooseberry 615
142GroRibes velutinumdesert gooseberry   
143HalMyriophyllum ~sibiricumSiberian milfoil 3 
144LamMonardella linoides ssp. strictanarrowleaf monardella 130
145LamScutellaria siphocampyloidescurve-flowered skullcap 2 
146LoaMentzelia congestaclustered blazing star 1 
147LoaMentzelia dispersascattered blazing star 4 
148MalFremontodendron californicumflannelbush 299
149MalMalacothamnus fremontiiFremont's bush mallow 34
150MalMalva neglecta*common mallowJL250
151MonCalyptridium monandrumsand cress 1 
152MonClaytonia exigua ssp. exigualittle spring beauty   
153MonClaytonia parviflora ssp. viridisgreen miner's lettuce 1 
154MonClaytonia perfoliata ssp. perfoliataminer's lettuce 1 
155MonClaytonia rubra ssp. rubrared-stemmed miner's lettuce 1 
156MonLewisia rediviva var. minorbitter root   
157OnaCamissonia campestris ssp. campestrisfield suncup 1 
158OnaCamissoniopsis pallida ssp. pallidapale suncup   
159OnaClarkia rhomboideadiamond-petaled clarkia   
160OnaEpilobium brachycarpumautumn willowweed 1 
161OnaEpilobium canum ssp. latifoliummountain California-fuchsia 199
162OnaEpilobium ciliatumwillowherbJL199
163OnaGayophytum decipiensdeceiving gayophytum 1 
164OnaGayophytum diffusum ssp. parviflorumgroundsmoke 3 
165OnaGayophytum oligospermumpinegrove groundsmoke  40
166OnaOenothera californica ssp. californicaCalifornia evening-primrose 3 
167OnaOenothera elata ssp. hirsutissimaHooker's evening-primroseJL ~1
168OroCastilleja affinis ssp. affiniscoast Indian paintbrush   
169OroCastilleja applegatei ssp. martiniiMartin's paintbrush  35
170OroCastilleja plagiotomaMojave Indian paintbrush   
171OroCordylanthus neviniiNevin's bird's beak  99
172OroOrobanche californica ssp. feudgeiCalifornia broomrape   
173OroOrobanche fasciculataclustered broomrape  11
174OroPedicularis semibarbatapine lousewort 11
175PapArgemone munitaprickly poppy 120
176PapEhrendorferia chrysanthagolden ear drops   
177PhrMimulus fremontii var. fremontiiFremont's monkeyflower 2 
178PhrMimulus guttatuscommon monkeyflower 1 
179PhrMimulus rubelluslittle redstem monkeyflower 1 
180PhrMimulus suksdorfiiSuksdorf's monkeyflower 1 
181PlaCollinsia callosadesert collinsia 2 
182PlaCollinsia torreyi var. wrightiiWright's collinsia 3 
183PlaPenstemon centranthifoliusscarlet bugler 3 
184PlaPenstemon grinnellii var. grinnelliiGrinnell's beardtongue  20
185PlaPenstemon labrosusSan Gabriel beardtongue 2 
186PlaPenstemon rostriflorusbeaked penstemon 199
187PlaPenstemon speciosusshowy penstemon 2 
188PlaPlantago major*common plantainJL399
189PlaVeronica anagallis-aquatica*water speedwellJL199
190PolAllophyllum gilioides ssp. gilioidesdense false-gilia   
191PolAllophyllum gilioides ssp. violaceumdense false-gilia 1 
192PolAllophyllum integrifoliumwhite false-gilia   
193PolEriastrum densifoliumgiant woolly-star 250
194PolEriastrum sapphirinumsapphire woolly-star 1 
195PolGilia brecciarum ssp. brecciarumNevada gilia 1 
196PolGilia diegensiscoastal gilia 1 
197PolGilia leptantha ssp. transversafine-flower gilia   
198PolGilia modocensisModoc gilia 1 
199PolGilia ochroleuca ssp. vividaSan Gabriel Mountain gilia 2~20
200PolLeptosiphon breviculusMojave linanthus 2 
201PolLinanthus concinnusSan Gabriel linanthus 2 
202PolPhlox diffusaspreading phlox 3 
203PolSaltugilia splendens ssp. grantiiGrant's gilia 1 
204PolSaltugilia splendens ssp. splendenssplendid gilia 3ssp5
205PolAcanthoscyphus parishii var. parishiiParish's oxytheca 8 
206PolEriogonum baileyi var. baileyiBailey's buckwheat 3 
207PolEriogonum cithariforme var. agninumCithara buckwheat 3 
208PolEriogonum davidsoniiDavidson's buckwheat 799
209PolEriogonum fasciculatum var. polifoliumCalifornia buckwheat 12
210PolEriogonum maculatumspotted buckwheat 7 
211PolEriogonum nudum var. pauciflorumnaked buckwheat  99
212PolEriogonum pusillumyellow-turbans   
213PolEriogonum umbellatum var. munziisulphur buckwheat 399
214PolEriogonum umbellatum var. subaridumdesert sulfur buckwheat  5
215PolEriogonum viridescensbright green buckwheat 1 
216PolEriogonum wrightii var. subscaposumWright's buckwheat 599
217PolPolygonum aviculare ssp. depressum*knotweedJL299
218PolRumex crispus*curly dockJL225
219PolRumex salicifoliuswillow-leaved dockJL22
220RanClematis ligusticifoliavirgin's bowerJL52
221RanDelphinium parishii ssp. parishiiParish's larkspur   
222RanDelphinium parryiblue larkspur   
223RanDelphinium patens ssp. montanumspreading larkspur   
224RanRanunculus cymbalariaRocky Mountain buttercupJL499
225RanThalictrum fendleriFendler's meadow-rue 1 
226RhaCeanothus cordulatusmountain whitethorn 24
227RhaCeanothus cuneatusbuck brush 1 
228RhaCeanothus integerrimus var. macrothyrsusdeer brush   
229RhaCeanothus vestitusMojave ceanothus 199
230RhaFrangula californicaCalifornia coffeeberry   
231RhaRhamnus ilicifoliahollyleaf redberry   
232RosAmelanchier utahensisUtah service-berry 42
233RosCercocarpus betuloides var. betuloidesbirch-leaf mountain-mahogany  99
234RosDrymocallis lactea var. lacteaNevada cinquefoil 2sp10
235RosHolodiscus discolor var. microphyllusmountain spray   
236RosHorkelia rydbergiiRydberg's horkelia 2 
237RosPotentilla gracilis var. fastigiataslender cinquefoil 1 
238RosPrunus emarginatabitter cherry 1 
239RosPrunus virginiana var. demissawestern choke-cherryJL699
240RosPurshia tridentata var. glandulosadesert bitterbrush 2 
241RosRosa californicaCalifornia wild rose 2 
242RosRosa woodsii ssp. gratissimainterior roseJL630
243RubGalium angustifolium ssp. angustifoliumnarrowleaf bedstraw   
244RubGalium aparinecommon bedstraw 4 
245RubGalium bifoliumlow mountain bedstraw 3 
246RubGalium halliinodding bedstraw 199
247RubGalium johnstoniiJohnston's bedstraw 499
248SalPopulus fremontii ssp. fremontiiFremont cottonwood 1 
249SalSalix laevigatared willowJL299
250SalSalix lasiolepisarroyo willowJL31
251SapAcer macrophyllumbigleaf maple 2 
252SaxLithophragma tenellumslender woodland star 1 
253ScrLimosella acaulisstemless mudwortJL999
254SolLycium andersoniiAnderson's boxthorn 1 
255SolNicotiana attenuatacoyote tobaccoJL11
256SolSolanum umbelliferumblue-witch nightshade 3 
257SolSolanum xantipurple nightshade 220
258VerVerbena lasiostachys var. lasiostachyswestern vervainJL430
259VioViola purpurea ssp. mohavensisMojave goosefoot violet 1 
260VioViola purpurea ssp. quercetorumgoosefoot yellow violet   
261VisArceuthobium campylopodumpine dwarf-mistletoe 199
262VisPhoradendron bolleanumfir mistletoe 240
263VisPhoradendron juniperinummistletoe 1 
264VisPhoradendron serotinum ssp. tomentosumoak mistletoe 240
265AgaHesperoyucca whippleichaparral yucca  20
266AllAllium fimbriatum var. fimbriatumfringed onion 4 
267AllAllium monticolaSan Bernardino Mountain onion   
268CypCarex almasturdy sedge 1 
269CypCarex fractafragile sheath sedge  ~5
270CypCarex multicaulisforest sedge 3 
271CypCarex subfuscabrown sedgeJL 15
272CypEleocharis acicularis var. acicularisneedle spikerushJL299
273CypEleocharis macrostachyacommon spikerush 2 
274CypEleocharis parishiiParish's spikerushJL799
275CypSchoenoplectus acutus var. occidentaliscommon tuleJL 5
276JunJuncus balticus ssp. aterwire rush 3 
277JunJuncus bufoniustoad rush 1 
278JunJuncus covilleiCoville's rush   
279JunJuncus mexicanusMexican rushJL799
280JunJuncus rugulosuswrinkled rush   
281JunJuncus saximontanusRocky Mountain rush 1 
282LilCalochortus invenustusplain mariposa lily 14
283LilFritillaria pinetorumpine-woods fritillary 3 
284MelVeratrum californicum var. californicumCalifornia corn lily   
285PoaAgrostis exarataspike bentgrassJL299
286PoaAgrostis stolonifera*creeping bentgrassJL310
287PoaAlopecurus pratensis*meadow foxtail 2 
288PoaBromus carinatus var. carinatusCalifornia brome 55
289PoaBromus carinatus var. marginatusMountain brome   
290PoaBromus halliiHall's brome  20
291PoaBromus tectorum*downy brome  99
292PoaCynodon dactylon*Bermuda grassJL 1
293PoaDactylis glomerata*orchard-grass 2 
294PoaElymus elymoidessquirreltail 399
295PoaElymus glaucus ssp. glaucusblue wildrye 1 
296PoaElymus trachycaulus ssp. trachycaulusslender wheatgrass   
297PoaElymus triticoidescreeping wild rye 3 
298PoaFestuca perennis*English rye-grass 2 
299PoaFestuca rubrared fescue 1 
300PoaFestuca temulenta*darnel 1 
301PoaHordeum jubatum ssp. jubatumsquirreltail barley 1 
302PoaHordeum murinum*foxtail barley 2 
303PoaHordeum vulgare*cultivated barley   
304PoaMelica strictarock melica 75
305PoaPoa annua*annual blue grass 2 
306PoaPoa bulbosa ssp. vivipara*bulbous blue grass 1 
307PoaPoa pratensis*Kentucky blue grass 2 
308PoaPoa secunda ssp. juncifoliarush blue grass   
309PoaPoa secunda ssp. secundaone-sided bluegrass 499
310PoaPolypogon monspeliensis*rabbits-foot grassJL399
311PoaPolypogon viridis*green bentgrass 1 
312PoaSorghum bicolor*sorghum 2 
313PoaStipa occidentaliswestern needlegrass  5
314PoaStipa occidentalis var. californicaCalifornia needlegrass   
315PoaStipa occidentalis var. occidentaliswestern needlegrass 2 
316PoaStipa occidentalis var. pubescensElmer's needlegrass 2 
317PoaStipa parishii var. parishiiParish's needlegrass 216
318PoaStipa speciosadesert needlegrass  10
319PoaTriticum aestivum*common wheat  1
320PotPotamogeton crispus*crispate-leaved pondweedJL610
321PotPotamogeton foliosus ssp. foliosusleafy pondweed 3 
322PotPotamogeton illinoensisshining pondweed 1 
323PotStuckenia pectinatafennel-leaved pondweedJL510
324TheDichelostemma capitatum ssp. capitatumblue dicks   
325TheMuilla maritimamuilla 2 
326TypTypha domingensissouthern cattailJL299
327ZanZannichellia palustrishorned pondweed 1 

Voucher data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/) on 4 September 2015.

We thank Jane Strong for finding the information about the origin of Jackson Lake.

We thank Landy Figueroa for help with the 5 September 2015 survey.

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Copyright © 2015 by Tom Chester, Keir Morse, Adrienne Ballwey, RT and Shaun Hawke, and Katie Gallagher.
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 September 2015