Flora of Jackson Lake Area, San Gabriel Mountains

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Table of Contents

Introduction
     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
     Vouchers
     Field Survey
     Checklist Numbers
     The Checklist

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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.

Introduction

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 Characteristics	Scientific Name	Common Name	Photograph
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 species	muskgrass, skunkweed	© Tom Chester
Leaves whorled, 3-11 per node, each with 2-4 segments, plant entirely submersed in water	Ceratophyllum demersum	coon's tail	© Neal Kramer
Submersed leaves whorled, 3-6 per node, each with up to 28 segments; inflorescence above water	Myriophyllum sp., possibly sibiricum	Siberian milfoil	©2001 CDFA
Leaves opposite	Zannichellia palustris	horned pondweed	© Neal Kramer
Leaves alternate, leaf blade serrate, inflorescence floating on water or above water	Potamogeton 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 illinoensis	shining pondweed	© Neal Kramer
Leaves alternate, leaf thread-like, inflorescence under water	Stuckenia pectinata (=Potamogeton pectinatus)	fennel-leaved pondweed	© Esperanza Pimentel
Leaves alternate, leaf blade linear, inflorescence floating on water or above water	Potamogeton foliosus ssp. foliosus	leafy 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:

• species vouchered from the area around Jackson Lake, noted by entries in the column with header #V;

• the results of a survey 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, noted by entries in the column with header #Pls;

• additional species found in a survey of the PCT from Lightning Ridge to Vincent Gap;

• additional species vouchered in the area of that PCT section.

Vouchers

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 Vouchers	Collector
176	31%	R. G. Swinney
134	23%	T. S. Ross
73	13%	R. F. Thorne
48	8%	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 Name	Reason for Rejection
Cupressus arizonica ssp. nevadensis	Planted by the Forest Service at Ball Flat
Ericameria parryi	Probable misdetermination
Galium biflorum	Typo
Gayophytum nuttallii	see note under Gayophytum diffusum parviflorum in JM eflora: "most small-flowered plants assigned by Munz, others to Gayophytum nuttallii belong here"
Horkelia bolanderi	Probable misdetermination
Opuntia basilaris var. treleasei	Probable misdetermination
Penstemon eatonii	Probable 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
Ferns
1	Equ	Equisetum arvense	field horsetail
2	Equ	Equisetum laevigatum	smooth scouring rush		2
3	Pte	Pellaea mucronata var. californica	California cliff-brake			1
4	Pte	Pellaea mucronata var. mucronata	bird's-foot fern
Gymnosperms
5	Cup	Calocedrus decurrens	incense-cedar	JL	2	2
6	Cup	Juniperus californica	California juniper		1
7	Cup	Sequoiadendron giganteum	*giant sequoia	JL		5
8	Pin	Abies concolor	white fir		2	50
9	Pin	Pinus coulteri	Coulter pine			2
10	Pin	Pinus jeffreyi	Jeffrey pine			99
11	Pin	Pinus lambertiana	sugar pine		2	15
12	Pin	Pinus monophylla	pinyon pine		1	4
13	Pin	Pinus ponderosa var. pacifica	ponderosa pine		1
Ceratophyllales
14	Cer	Ceratophyllum demersum	coon's tail		1
Eudicots
15	Ado	Sambucus nigra ssp. caerulea	blue elderberry			5
16	Ama	Amaranthus albus	*tumble pigweed	JL	3	99
17	Ama	Amaranthus blitoides	*mat amaranth		1
18	Api	Lomatium dissectum var. multifidum	fern-leaved lomatium		1	~1
19	Api	Lomatium mohavense	Mojave lomatium		1
20	Api	Lomatium nevadense var. parishii	Parish's lomatium		2
21	Api	Osmorhiza berteroi	mountain sweet-cicely		2
22	Api	Tauschia parishii	Parish's tauschia		4	20
23	Apo	Apocynum androsaemifolium	spreading dogbane
24	Apo	Asclepias californica	California milkweed		6	10
25	Ast	Agoseris grandiflora var. grandiflora	grand mountain dandelion
26	Ast	Agoseris retrorsa	spear-leaved mountain dandelion			~1
27	Ast	Ambrosia acanthicarpa	bur-ragweed	JL	1	99
28	Ast	Anisocoma acaulis	scale-bud
29	Ast	Artemisia douglasiana	mugwort		3
30	Ast	Artemisia dracunculus	wild tarragon		2	30
31	Ast	Artemisia tridentata	big sagebrush		4	99
32	Ast	Chaenactis glabriuscula var. glabriuscula	yellow pincushion		3
33	Ast	Chaenactis santolinoides	santolina pincushion		1	30
34	Ast	Cirsium occidentale var. californicum	California thistle		2	5
35	Ast	Corethrogyne filaginifolia	California-aster
36	Ast	Dieteria canescens var. canescens	hoary-aster
37	Ast	Ericameria nauseosa var. bernardina	San Bernardino rubber rabbitbrush		4	50
38	Ast	Ericameria nauseosa var. mohavensis	Mohave common rabbitbrush
39	Ast	Ericameria nauseosa var. oreophila	threadleaf common rabbitbrush		2	1
40	Ast	Erigeron canadensis	horseweed	JL	1	99
41	Ast	Erigeron divergens	spreading fleabane		2
42	Ast	Erigeron foliosus var. foliosus	leafy daisy		3	50
43	Ast	Eriophyllum confertiflorum var. confertiflorum	golden yarrow		1	30
44	Ast	Euthamia occidentalis	western goldenrod		1
45	Ast	Gnaphalium palustre	western marsh cudweed		1
46	Ast	Lactuca serriola	*prickly lettuce	JL	2	1
47	Ast	Lessingia glandulifera var. glandulifera	sticky lessingia			1
48	Ast	Malacothrix californica	California dandelion		2
49	Ast	Malacothrix glabrata	desert dandelion		1
50	Ast	Packera ionophylla	Tehachapi ragwort		2	10
51	Ast	Pleiacanthus spinosus	thorny skeleton-plant
52	Ast	Pseudognaphalium thermale	slender everlasting		2
53	Ast	Senecio flaccidus var. douglasii	bush senecio		1
54	Ast	Solidago velutina ssp. californica	goldenrod		2	99
55	Ast	Sonchus asper ssp. asper	*prickly sow thistle	JL	1	1
56	Ast	Stephanomeria exigua ssp. coronaria	slender wreathplant		3	5
57	Ast	Stephanomeria virgata	twiggy wreath plant
58	Ast	Taraxacum officinale	*common dandelion	JL	3	1
59	Ast	Tetradymia canescens	spineless horsebrush			30
60	Bet	Alnus rhombifolia	white alder		1
61	Bor	Cryptantha affinis	common cryptantha		1
62	Bor	Cryptantha echinella	prickly cryptantha		1
63	Bor	Cryptantha muricata var. denticulata	prickly-nut cryptantha
64	Bor	Cryptantha muricata var. jonesii	Jones' prickly-nut cryptantha
65	Bor	Cryptantha muricata var. muricata	showy prickly-nut cryptantha		2
66	Bor	Cryptantha simulans	pine cryptantha		7
67	Bor	Eriodictyon parryi	poodle-dog bush
68	Bor	Eriodictyon trichocalyx var. trichocalyx	smoothleaf yerba santa			99
69	Bor	Nama californica	California fiddleleaf		1
70	Bor	Pectocarya penicillata	combseed		1
71	Bor	Phacelia austromontana	southern Sierra phacelia
72	Bor	Phacelia bicolor var. bicolor	two-colored phacelia		1
73	Bor	Phacelia cicutaria var. hispida	caterpillar phacelia		1
74	Bor	Phacelia curvipes	curve-stem phacelia
75	Bor	Phacelia davidsonii	Davidson's phacelia		4
76	Bor	Phacelia fremontii	Fremont's phacelia		1
77	Bor	Phacelia imbricata	imbricate phacelia		1	99
78	Bor	Phacelia mohavensis	Mojave phacelia		2
79	Bor	Phacelia ramosissima	branching phacelia			7
80	Bra	Barbarea orthoceras	winter cress		6
81	Bra	Boechera arcuata	arched elegant rock-cress
82	Bra	Boechera californica	California elegant rock-cress
83	Bra	Boechera repanda	Yosemite rockcress		2	10
84	Bra	Boechera retrofracta X	mountain rock-cress
85	Bra	Caulanthus amplexicaulis	clasping-leaved caulanthus		1
86	Bra	Caulanthus major	slender wild cabbage		4	20
87	Bra	Descurainia sophia	*herb sophia		1
88	Bra	Erysimum capitatum var. capitatum	western wallflower		3	99
89	Bra	Hirschfeldia incana	*shortpod mustard	JL	1	10
90	Bra	Lepidium virginicum ssp. menziesii	wild pepper-grass	JL	2	2
91	Bra	Sisymbrium altissimum	*tumble-mustard		3
92	Cac	Opuntia basilaris var. brachyclada	short-joint beavertail		1
93	Cap	Lonicera subspicata var. denudata	southern honeysuckle			sp10
94	Cap	Symphoricarpos rotundifolius var. parishii	Parish's snowberry		1	4
95	Car	Eremogone macradenia var. arcuifolia	desert sandwort		2	25
96	Car	Silene verecunda	white catch-fly		4	50
97	Che	Atriplex rosea	*tumbling oracle		3
98	Che	Chenopodium atrovirens	forest goosefoot
99	Che	Chenopodium fremontii	Fremont's goosefoot	JL	2	99
100	Che	Chenopodium leptophyllum	thin-leaved goosefoot
101	Che	Chenopodium murale	*nettle-leaved goosefoot		1
102	Che	Chenopodium pratericola	meadow goosefoot
103	Che	Chenopodium strictum var. glaucophyllum	*white-leaved goosefoot
104	Che	Dysphania botrys	*Jerusalem oak		1
105	Che	Salsola gobicola	*hybrid thistle
106	Con	Calystegia occidentalis ssp. fulcrata	western morning-glory		2	50
107	Con	Calystegia peirsonii	Peirson's morning-glory
108	Con	Cuscuta californica var. californica	California dodder			40
109	Cor	Cornus sericea ssp. occidentalis	western dogwood		1
110	Cor	Cornus sericea ssp. sericea	red osier dogwood		3
111	Cra	Dudleya cymosa ssp. pumila	canyon dudleya
112	Ela	Elaeagnus angustifolia	*Russian olive		6
113	Eri	Arctostaphylos patula	green-leaf manzanita
114	Eri	Sarcodes sanguinea	snow-plant		5
115	Eup	Chamaesyce serpyllifolia ssp. serpyllifolia	thyme-leafed spurge		3
116	Fab	Acmispon americanus var. americanus	Spanish clover	JL	2	99
117	Fab	Acmispon nevadensis var. davidsonii	Davidson's lotus		3	30
118	Fab	Acmispon procumbens var. procumbens	silky California broom		4	3
119	Fab	Astragalus douglasii var. douglasii	Jacumba milk-vetch		1	10
120	Fab	Astragalus lentiginosus var. antonius	San Antonio milk-vetch
121	Fab	Astragalus leucolobus	Big Bear Valley woollypod		3
122	Fab	Astragalus purshii var. lectulus	Pursh's milk-vetch		3
123	Fab	Hosackia crassifolia var. crassifolia	broad-leaved lotus		2	15
124	Fab	Lupinus elatus	silky lupine
125	Fab	Lupinus excubitus var. austromontanus	mountain grape-soda lupine			30
126	Fab	Lupinus formosus var. formosus	western lupine			2
127	Fab	Lupinus hyacinthinus	San Jacinto lupine
128	Fab	Melilotus albus	*white sweetclover	JL	1	99
129	Fab	Trifolium variegatum	variegated clover		1
130	Fab	Trifolium wormskioldii	cows clover		4
131	Fag	Chrysolepis sempervirens	bush chinquapin
132	Fag	Quercus chrysolepis	canyon live oak		2	99
133	Fag	Quercus john-tuckeri	Tucker's oak		4	1
134	Fag	Quercus kelloggii	California black oak		9	99
135	Gar	Garrya flavescens	ashy silk tassel			3
136	Gen	Frasera neglecta	pine green-gentian		6	25
137	Ger	Erodium cicutarium	*redstem filaree	JL		20
138	Gro	Ribes cereum var. cereum	wax currant		5	2
139	Gro	Ribes lasianthum	alpine gooseberry		1
140	Gro	Ribes nevadense	mountain pink currant		6	99
141	Gro	Ribes roezlii var. roezlii	Sierra gooseberry		6	15
142	Gro	Ribes velutinum	desert gooseberry
143	Hal	Myriophyllum ~sibiricum	Siberian milfoil		3
144	Lam	Monardella linoides ssp. stricta	narrowleaf monardella		1	30
145	Lam	Scutellaria siphocampyloides	curve-flowered skullcap		2
146	Loa	Mentzelia congesta	clustered blazing star		1
147	Loa	Mentzelia dispersa	scattered blazing star		4
148	Mal	Fremontodendron californicum	flannelbush		2	99
149	Mal	Malacothamnus fremontii	Fremont's bush mallow		3	4
150	Mal	Malva neglecta	*common mallow	JL	2	50
151	Mon	Calyptridium monandrum	sand cress		1
152	Mon	Claytonia exigua ssp. exigua	little spring beauty
153	Mon	Claytonia parviflora ssp. viridis	green miner's lettuce		1
154	Mon	Claytonia perfoliata ssp. perfoliata	miner's lettuce		1
155	Mon	Claytonia rubra ssp. rubra	red-stemmed miner's lettuce		1
156	Mon	Lewisia rediviva var. minor	bitter root
157	Ona	Camissonia campestris ssp. campestris	field suncup		1
158	Ona	Camissoniopsis pallida ssp. pallida	pale suncup
159	Ona	Clarkia rhomboidea	diamond-petaled clarkia
160	Ona	Epilobium brachycarpum	autumn willowweed		1
161	Ona	Epilobium canum ssp. latifolium	mountain California-fuchsia		1	99
162	Ona	Epilobium ciliatum	willowherb	JL	1	99
163	Ona	Gayophytum decipiens	deceiving gayophytum		1
164	Ona	Gayophytum diffusum ssp. parviflorum	groundsmoke		3
165	Ona	Gayophytum oligospermum	pinegrove groundsmoke			40
166	Ona	Oenothera californica ssp. californica	California evening-primrose		3
167	Ona	Oenothera elata ssp. hirsutissima	Hooker's evening-primrose	JL		~1
168	Oro	Castilleja affinis ssp. affinis	coast Indian paintbrush
169	Oro	Castilleja applegatei ssp. martinii	Martin's paintbrush			35
170	Oro	Castilleja plagiotoma	Mojave Indian paintbrush
171	Oro	Cordylanthus nevinii	Nevin's bird's beak			99
172	Oro	Orobanche californica ssp. feudgei	California broomrape
173	Oro	Orobanche fasciculata	clustered broomrape			11
174	Oro	Pedicularis semibarbata	pine lousewort		1	1
175	Pap	Argemone munita	prickly poppy		1	20
176	Pap	Ehrendorferia chrysantha	golden ear drops
177	Phr	Mimulus fremontii var. fremontii	Fremont's monkeyflower		2
178	Phr	Mimulus guttatus	common monkeyflower		1
179	Phr	Mimulus rubellus	little redstem monkeyflower		1
180	Phr	Mimulus suksdorfii	Suksdorf's monkeyflower		1
181	Pla	Collinsia callosa	desert collinsia		2
182	Pla	Collinsia torreyi var. wrightii	Wright's collinsia		3
183	Pla	Penstemon centranthifolius	scarlet bugler		3
184	Pla	Penstemon grinnellii var. grinnellii	Grinnell's beardtongue			20
185	Pla	Penstemon labrosus	San Gabriel beardtongue		2
186	Pla	Penstemon rostriflorus	beaked penstemon		1	99
187	Pla	Penstemon speciosus	showy penstemon		2
188	Pla	Plantago major	*common plantain	JL	3	99
189	Pla	Veronica anagallis-aquatica	*water speedwell	JL	1	99
190	Pol	Allophyllum gilioides ssp. gilioides	dense false-gilia
191	Pol	Allophyllum gilioides ssp. violaceum	dense false-gilia		1
192	Pol	Allophyllum integrifolium	white false-gilia
193	Pol	Eriastrum densifolium	giant woolly-star		2	50
194	Pol	Eriastrum sapphirinum	sapphire woolly-star		1
195	Pol	Gilia brecciarum ssp. brecciarum	Nevada gilia		1
196	Pol	Gilia diegensis	coastal gilia		1
197	Pol	Gilia leptantha ssp. transversa	fine-flower gilia
198	Pol	Gilia modocensis	Modoc gilia		1
199	Pol	Gilia ochroleuca ssp. vivida	San Gabriel Mountain gilia		2	~20
200	Pol	Leptosiphon breviculus	Mojave linanthus		2
201	Pol	Linanthus concinnus	San Gabriel linanthus		2
202	Pol	Phlox diffusa	spreading phlox		3
203	Pol	Saltugilia splendens ssp. grantii	Grant's gilia		1
204	Pol	Saltugilia splendens ssp. splendens	splendid gilia		3	ssp5
205	Pol	Acanthoscyphus parishii var. parishii	Parish's oxytheca		8
206	Pol	Eriogonum baileyi var. baileyi	Bailey's buckwheat		3
207	Pol	Eriogonum cithariforme var. agninum	Cithara buckwheat		3
208	Pol	Eriogonum davidsonii	Davidson's buckwheat		7	99
209	Pol	Eriogonum fasciculatum var. polifolium	California buckwheat		1	2
210	Pol	Eriogonum maculatum	spotted buckwheat		7
211	Pol	Eriogonum nudum var. pauciflorum	naked buckwheat			99
212	Pol	Eriogonum pusillum	yellow-turbans
213	Pol	Eriogonum umbellatum var. munzii	sulphur buckwheat		3	99
214	Pol	Eriogonum umbellatum var. subaridum	desert sulfur buckwheat			5
215	Pol	Eriogonum viridescens	bright green buckwheat		1
216	Pol	Eriogonum wrightii var. subscaposum	Wright's buckwheat		5	99
217	Pol	Polygonum aviculare ssp. depressum	*knotweed	JL	2	99
218	Pol	Rumex crispus	*curly dock	JL	2	25
219	Pol	Rumex salicifolius	willow-leaved dock	JL	2	2
220	Ran	Clematis ligusticifolia	virgin's bower	JL	5	2
221	Ran	Delphinium parishii ssp. parishii	Parish's larkspur
222	Ran	Delphinium parryi	blue larkspur
223	Ran	Delphinium patens ssp. montanum	spreading larkspur
224	Ran	Ranunculus cymbalaria	Rocky Mountain buttercup	JL	4	99
225	Ran	Thalictrum fendleri	Fendler's meadow-rue		1
226	Rha	Ceanothus cordulatus	mountain whitethorn		2	4
227	Rha	Ceanothus cuneatus	buck brush		1
228	Rha	Ceanothus integerrimus var. macrothyrsus	deer brush
229	Rha	Ceanothus vestitus	Mojave ceanothus		1	99
230	Rha	Frangula californica	California coffeeberry
231	Rha	Rhamnus ilicifolia	hollyleaf redberry
232	Ros	Amelanchier utahensis	Utah service-berry		4	2
233	Ros	Cercocarpus betuloides var. betuloides	birch-leaf mountain-mahogany			99
234	Ros	Drymocallis lactea var. lactea	Nevada cinquefoil		2	sp10
235	Ros	Holodiscus discolor var. microphyllus	mountain spray
236	Ros	Horkelia rydbergii	Rydberg's horkelia		2
237	Ros	Potentilla gracilis var. fastigiata	slender cinquefoil		1
238	Ros	Prunus emarginata	bitter cherry		1
239	Ros	Prunus virginiana var. demissa	western choke-cherry	JL	6	99
240	Ros	Purshia tridentata var. glandulosa	desert bitterbrush		2
241	Ros	Rosa californica	California wild rose		2
242	Ros	Rosa woodsii ssp. gratissima	interior rose	JL	6	30
243	Rub	Galium angustifolium ssp. angustifolium	narrowleaf bedstraw
244	Rub	Galium aparine	common bedstraw		4
245	Rub	Galium bifolium	low mountain bedstraw		3
246	Rub	Galium hallii	nodding bedstraw		1	99
247	Rub	Galium johnstonii	Johnston's bedstraw		4	99
248	Sal	Populus fremontii ssp. fremontii	Fremont cottonwood		1
249	Sal	Salix laevigata	red willow	JL	2	99
250	Sal	Salix lasiolepis	arroyo willow	JL	3	1
251	Sap	Acer macrophyllum	bigleaf maple		2
252	Sax	Lithophragma tenellum	slender woodland star		1
253	Scr	Limosella acaulis	stemless mudwort	JL	9	99
254	Sol	Lycium andersonii	Anderson's boxthorn		1
255	Sol	Nicotiana attenuata	coyote tobacco	JL	1	1
256	Sol	Solanum umbelliferum	blue-witch nightshade		3
257	Sol	Solanum xanti	purple nightshade		2	20
258	Ver	Verbena lasiostachys var. lasiostachys	western vervain	JL	4	30
259	Vio	Viola purpurea ssp. mohavensis	Mojave goosefoot violet		1
260	Vio	Viola purpurea ssp. quercetorum	goosefoot yellow violet
261	Vis	Arceuthobium campylopodum	pine dwarf-mistletoe		1	99
262	Vis	Phoradendron bolleanum	fir mistletoe		2	40
263	Vis	Phoradendron juniperinum	mistletoe		1
264	Vis	Phoradendron serotinum ssp. tomentosum	oak mistletoe		2	40
Monocots
265	Aga	Hesperoyucca whipplei	chaparral yucca			20
266	All	Allium fimbriatum var. fimbriatum	fringed onion		4
267	All	Allium monticola	San Bernardino Mountain onion
268	Cyp	Carex alma	sturdy sedge		1
269	Cyp	Carex fracta	fragile sheath sedge			~5
270	Cyp	Carex multicaulis	forest sedge		3
271	Cyp	Carex subfusca	brown sedge	JL		15
272	Cyp	Eleocharis acicularis var. acicularis	needle spikerush	JL	2	99
273	Cyp	Eleocharis macrostachya	common spikerush		2
274	Cyp	Eleocharis parishii	Parish's spikerush	JL	7	99
275	Cyp	Schoenoplectus acutus var. occidentalis	common tule	JL		5
276	Jun	Juncus balticus ssp. ater	wire rush		3
277	Jun	Juncus bufonius	toad rush		1
278	Jun	Juncus covillei	Coville's rush
279	Jun	Juncus mexicanus	Mexican rush	JL	7	99
280	Jun	Juncus rugulosus	wrinkled rush
281	Jun	Juncus saximontanus	Rocky Mountain rush		1
282	Lil	Calochortus invenustus	plain mariposa lily		1	4
283	Lil	Fritillaria pinetorum	pine-woods fritillary		3
284	Mel	Veratrum californicum var. californicum	California corn lily
285	Poa	Agrostis exarata	spike bentgrass	JL	2	99
286	Poa	Agrostis stolonifera	*creeping bentgrass	JL	3	10
287	Poa	Alopecurus pratensis	*meadow foxtail		2
288	Poa	Bromus carinatus var. carinatus	California brome		5	5
289	Poa	Bromus carinatus var. marginatus	Mountain brome
290	Poa	Bromus hallii	Hall's brome			20
291	Poa	Bromus tectorum	*downy brome			99
292	Poa	Cynodon dactylon	*Bermuda grass	JL		1
293	Poa	Dactylis glomerata	*orchard-grass		2
294	Poa	Elymus elymoides	squirreltail		3	99
295	Poa	Elymus glaucus ssp. glaucus	blue wildrye		1
296	Poa	Elymus trachycaulus ssp. trachycaulus	slender wheatgrass
297	Poa	Elymus triticoides	creeping wild rye		3
298	Poa	Festuca perennis	*English rye-grass		2
299	Poa	Festuca rubra	red fescue		1
300	Poa	Festuca temulenta	*darnel		1
301	Poa	Hordeum jubatum ssp. jubatum	squirreltail barley		1
302	Poa	Hordeum murinum	*foxtail barley		2
303	Poa	Hordeum vulgare	*cultivated barley
304	Poa	Melica stricta	rock melica		7	5
305	Poa	Poa annua	*annual blue grass		2
306	Poa	Poa bulbosa ssp. vivipara	*bulbous blue grass		1
307	Poa	Poa pratensis	*Kentucky blue grass		2
308	Poa	Poa secunda ssp. juncifolia	rush blue grass
309	Poa	Poa secunda ssp. secunda	one-sided bluegrass		4	99
310	Poa	Polypogon monspeliensis	*rabbits-foot grass	JL	3	99
311	Poa	Polypogon viridis	*green bentgrass		1
312	Poa	Sorghum bicolor	*sorghum		2
313	Poa	Stipa occidentalis	western needlegrass			5
314	Poa	Stipa occidentalis var. californica	California needlegrass
315	Poa	Stipa occidentalis var. occidentalis	western needlegrass		2
316	Poa	Stipa occidentalis var. pubescens	Elmer's needlegrass		2
317	Poa	Stipa parishii var. parishii	Parish's needlegrass		2	16
318	Poa	Stipa speciosa	desert needlegrass			10
319	Poa	Triticum aestivum	*common wheat			1
320	Pot	Potamogeton crispus	*crispate-leaved pondweed	JL	6	10
321	Pot	Potamogeton foliosus ssp. foliosus	leafy pondweed		3
322	Pot	Potamogeton illinoensis	shining pondweed		1
323	Pot	Stuckenia pectinata	fennel-leaved pondweed	JL	5	10
324	The	Dichelostemma capitatum ssp. capitatum	blue dicks
325	The	Muilla maritima	muilla		2
326	Typ	Typha domingensis	southern cattail	JL	2	99
327	Zan	Zannichellia palustris	horned pondweed		1

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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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