Flora of Palm Wash Area, Extreme Northwest Imperial County

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Introduction
Location
Fieldwork Results
Procedure For Compiling The Checklist
Important Caveats
Checklist

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Introduction

I compiled this list from vouchers prior to a trip to search for Chaenactis carphoclinia var. peirsonii on 28 February 2010.

See also Flora of Palm Wash Area in both San Diego and Imperial Counties.

Location

Voucher locations are plotted in the following map:

A very small portion of the Salton Sea is seen at upper right. The mountains in the upper left are the southwest tip of the Santa Rosa Mountains. The San Diego / Imperial County line is marked by the north-side boundary between different shades of green immediately west of the vouchers. County Road S22 from Borrego Springs to SR86 is shown going mostly east-west along the lower part of the map.

Fieldwork Results

Procedure For Compiling The Checklist

On 28 February 2010, I did a geographic search of the Consortium of California Herbaria for vouchers with coordinates in the box defined by latitude 33.273 to 33.339° and longitude -116.083 to -115.979°. A total of 644 vouchers were found, of 121 taxa. Most taxa are fully resolved to their lowest level, but a few are given only to the species level. If it was unambiguous which subspecies is present here, I assigned those vouchers to that subspecies. Some species with two subspecies, such as Chaenactis carphoclinia, could not be so assigned, and hence the following list gives both the species and the two subspecies, with the number of vouchers given for each one.

The dominant collectors by far are Jon Rebman and Larry Hendrickson, with various permutations of co-collectors:

# Vouchers	Collectors
200	Jon Rebman, W. Schmidtmann & V. Marshall
105	Jon Rebman, G. Fleming, W. Schmidtmann, & G. Erbeck
83	Jon Rebman, G. Fleming and W. Schmidtmann
62	Larry Hendrickson, L. Louise Jee
49	Jon Rebman, W. Schmidtmann, L. Hendrickson, & L. L. Jee
40	Larry Hendrickson, Kim Marsden, L. Louise Jee
37	Jon Rebman, G. Fleming, V. Marshall, & A. Winner
10	Larry Hendrickson, Kim Marsden, Mary Delavalle

Important Caveats

Please note the following important caveats about this preliminary Checklist:

• We have not looked at any of the vouchers, so we cannot vouch for their determinations. We have checked only the names of the taxa to make sure it was not unreasonable for them to occur here. However, the vast majority of the vouchers have been determined by Jon Rebman, and so are highly reliably determined.

• This is a very preliminary first draft Checklist, compiled quickly and without review by other knowledgeable botanists, and so well may contain bonehead errors.

Checklist for Palm Wash Area

The Checklist is sorted first by category - ferns, dicots, and monocots - and then by family and scientific name. The JM Family and Scientific Name are from the Jepson Manual. An asterisk before the Common Name indicates a non-native taxon.

The column labeled V gives the total number of vouchers found in the area.

The column labeled BD gives the total number of areas in the Borrego Desert to the west in which each taxon has been observed by me. I placed this column here primarily for my use, to see which taxa I should especially look for. (Note that a zero in this field might just mean that it is a voucher species not fully determined to subspecies level.)

This is a working list, about which we make no guarantees at all. Use at your own risk!

Version for printing, without lines and other text on this page: html (4 pages) or pdf Clickbook booklet (1 double-sided pages). (See printing instructions for an explanation of these options)

#	JM Family	Scientific Name	(*)Common Name	V	BD
1	Amaranthaceae	Tidestromia oblongifolia	Arizona honeysweet	3	6
2	Asclepiadaceae	Asclepias subulata	rush milkweed	1	5
3	Asteraceae	Adenophyllum porophylloides	San Felipe dogweed	3	28
4	Asteraceae	Ambrosia dumosa	burroweed	15	46
5	Asteraceae	Bebbia juncea var. aspera	sweetbush	4	44
6	Asteraceae	Calycoseris wrightii	white tackstem	12	6
7	Asteraceae	Chaenactis carphoclinia	pebble pincushion	1	0
8	Asteraceae	Chaenactis carphoclinia var. carphoclinia	pebble pincushion	16	13
9	Asteraceae	Chaenactis carphoclinia var. peirsonii	Peirson's pincushion	17	0
10	Asteraceae	Chaenactis fremontii	Fremont pincushion	2	12
11	Asteraceae	Chaenactis stevioides	desert pincushion	3	5
12	Asteraceae	Encelia farinosa	brittlebush	10	49
13	Asteraceae	Encelia frutescens	button encelia	9	9
14	Asteraceae	Filago arizonica	Arizona herba impia	1	1
15	Asteraceae	Geraea canescens	hairy desert-sunflower	19	8
16	Asteraceae	Hymenoclea salsola var. salsola	cheesebush	11	42
17	Asteraceae	Isocoma acradenia var. eremophila	solitary-leaved alkali goldenbush	1	4
18	Asteraceae	Malacothrix glabrata	desert dandelion	8	18
19	Asteraceae	Monoptilon bellioides	desert star	13	9
20	Asteraceae	Palafoxia arida var. arida	desert needle	15	23
21	Asteraceae	Perityle emoryi	Emory's rock-daisy	14	30
22	Asteraceae	Peucephyllum schottii	pygmy-cedar	1	6
23	Asteraceae	Pluchea sericea	arrow-weed	1	10
24	Asteraceae	Psathyrotes ramosissima	turtleback	4	3
25	Asteraceae	Rafinesquia neomexicana	desert chicory	14	27
26	Asteraceae	Senecio mohavensis	Mojave ragwort	4	19
27	Asteraceae	Sonchus oleraceus	*sow thistle	4	8
28	Asteraceae	Stephanomeria pauciflora var. pauciflora	wire-lettuce	4	45
29	Asteraceae	Stylocline intertexta	tangled nest-straw	1	0
30	Asteraceae	Trichoptilium incisum	yellow-head	7	5
31	Asteraceae	Xylorhiza orcuttii	Orcutt's woody-aster	19	6
32	Boraginaceae	Cryptantha angustifolia	narrow-leaved cryptantha	18	20
33	Boraginaceae	Cryptantha barbigera	bearded cryptantha	10	20
34	Boraginaceae	Cryptantha costata	ribbed cryptantha	3	2
35	Boraginaceae	Cryptantha maritima	Guadalupe cryptantha	18	15
36	Boraginaceae	Pectocarya heterocarpa	chuckwalla pectocarya	8	10
37	Boraginaceae	Pectocarya platycarpa	broad-fruited combseed	2	3
38	Boraginaceae	Pectocarya recurvata	curvenut combseed	4	12
39	Boraginaceae	Tiquilia palmeri	Palmer's coldenia	8	14
40	Boraginaceae	Tiquilia plicata	plicate coldenia	4	7
41	Brassicaceae	Brassica tournefortii	*Asian mustard	13	46
42	Brassicaceae	Descurainia pinnata ssp. halictorum	alkali western tansy-mustard	1	5
43	Brassicaceae	Dithyrea californica	spectacle-pod	1	9
44	Brassicaceae	Draba cuneifolia	wedge-leaved draba	1	0
45	Brassicaceae	Lepidium lasiocarpum var. lasiocarpum	hairy-podded pepper-grass	12	30
46	Brassicaceae	Sisymbrium irio	*London rocket	2	10
47	Brassicaceae	Streptanthella longirostris	longbeak streptanthella	2	4
48	Cactaceae	Opuntia basilaris var. basilaris	beavertail cactus	2	41
49	Cactaceae	Opuntia echinocarpa	silver cholla	1	19
50	Caryophyllaceae	Achyronychia cooperi	frost mat	4	9
51	Chenopodiaceae	Allenrolfea occidentalis	iodine-bush	1	2
52	Chenopodiaceae	Atriplex hymenelytra	desert holly	8	13
53	Chenopodiaceae	Chenopodium murale	*nettle-leaved goosefoot	1	8
54	Chenopodiaceae	Salsola gobicola	*hybrid thistle	1	0
55	Chenopodiaceae	Salsola paulsenii	*Paulsen's Russian thistle	4	0
56	Euphorbiaceae	Chamaesyce polycarpa	small-seeded spurge	6	40
57	Fabaceae	Acacia greggii	catclaw	2	44
58	Fabaceae	Astragalus crotalariae	Salton milk-vetch	3	3
59	Fabaceae	Astragalus sabulonum	gravel milk-vetch	1	0
60	Fabaceae	Cercidium floridum ssp. floridum	blue palo verde	2	8
61	Fabaceae	Dalea mollis	silky dalea	1	1
62	Fabaceae	Dalea mollissima	downy dalea	3	5
63	Fabaceae	Lotus strigosus	strigose lotus	2	12
64	Fabaceae	Lupinus arizonicus	Arizona lupine	4	26
65	Fabaceae	Prosopis glandulosa var. torreyana	honey mesquite	2	21
66	Fabaceae	Psorothamnus emoryi	Emory's indigo-bush	3	21
67	Fabaceae	Psorothamnus schottii	indigo bush	5	43
68	Fouquieriaceae	Fouquieria splendens ssp. splendens	ocotillo	3	48
69	Hydrophyllaceae	Nama pusillum	small-leaved nama	1	0
70	Hydrophyllaceae	Phacelia crenulata	heliotrope phacelia	1	6
71	Hydrophyllaceae	Phacelia crenulata var. ambigua	heliotrope phacelia	9	17
72	Hydrophyllaceae	Phacelia neglecta	alkali phacelia	2	0
73	Krameriaceae	Krameria erecta	Pima rhatany	1	15
74	Krameriaceae	Krameria grayi	white rhatany	3	37
75	Lamiaceae	Hyptis emoryi	desert-lavender	2	44
76	Loasaceae	Mentzelia involucrata	bracted blazing star	6	19
77	Loasaceae	Petalonyx thurberi	Thurber's sandpaper-plant	1	0
78	Malvaceae	Eremalche rotundifolia	desert five-spot	2	5
79	Malvaceae	Hibiscus denudatus	rock hibiscus	1	26
80	Nyctaginaceae	Abronia villosa var. villosa	hairy sand-verbena	6	10
81	Nyctaginaceae	Allionia incarnata	trailing four o'clock	1	12
82	Nyctaginaceae	Mirabilis bigelovii var. retrorsa	Bigelow's desert four-o'clock	1	30
83	Onagraceae	Camissonia boothii ssp. condensata	Booth's evening primrose	7	26
84	Onagraceae	Camissonia californica	California suncup	6	45
85	Onagraceae	Camissonia cardiophylla ssp. cardiophylla	heartleaf sun-cup	2	10
86	Onagraceae	Camissonia claviformis ssp. peirsonii	brown-eyed primrose	11	26
87	Onagraceae	Oenothera deltoides	dune primrose	1	0
88	Orobanchaceae	Orobanche cooperi	Cooper's broom-rape	3	3
89	Papaveraceae	Eschscholzia parishii	Parish's poppy	8	15
90	Plantaginaceae	Plantago ovata	desert plantain	8	32
91	Polemoniaceae	Gilia latifolia	broad-leaf gilia	9	7
92	Polemoniaceae	Langloisia setosissima ssp. setosissima	bristly langloisia	8	4
93	Polemoniaceae	Loeseliastrum matthewsii	desert calico	1	5
94	Polygonaceae	Chorizanthe brevicornu var. brevicornu	brittle spineflower	6	30
95	Polygonaceae	Chorizanthe corrugata	wrinkled spineflower	9	2
96	Polygonaceae	Chorizanthe rigida	devil's spineflower	4	12
97	Polygonaceae	Eriogonum deflexum var. deflexum	flat-topped buckwheat	4	4
98	Polygonaceae	Eriogonum deserticola	Colorado Desert buckwheat	1	0
99	Polygonaceae	Eriogonum inflatum	desert trumpet	3	37
100	Polygonaceae	Eriogonum thomasii	Thomas' buckwheat	11	20
101	Polygonaceae	Eriogonum trichopes	little desert trumpet	9	9
102	Portulacaceae	Calandrinia ambigua	desert red maids	5	4
103	Resedaceae	Oligomeris linifolia	lineleaf whitepuff	6	8
104	Scrophulariaceae	Mohavea confertiflora	ghost flower	2	5
105	Solanaceae	Lycium brevipes	desert-thorn	2	0
106	Solanaceae	Nicotiana obtusifolia	desert tobacco	1	21
107	Tamaricaceae	Tamarix aphylla	*athel	1	2
108	Tamaricaceae	Tamarix ramosissima	*saltcedar	3	1
109	Viscaceae	Phoradendron californicum	desert mistletoe	1	36
110	Zygophyllaceae	Fagonia pachyacantha	sticky fagonia	1	5
111	Zygophyllaceae	Larrea tridentata	creosote bush	7	52
112	Juncaceae	Juncus cooperi	Cooper's rush	1	2
113	Liliaceae	Hesperocallis undulata	desert lily	9	15
114	Poaceae	Aristida adscensionis	six-weeks three-awn	17	11
115	Poaceae	Bromus madritensis ssp. rubens	*red brome	1	26
116	Poaceae	Hordeum murinum ssp. glaucum	*foxtail barley	1	1
117	Poaceae	Phalaris minor	*little-seed canarygrass	3	0
118	Poaceae	Pleuraphis rigida	big galleta	12	43
119	Poaceae	Schismus arabicus	*Mediterranean grass	5	0
120	Poaceae	Schismus barbatus	*Mediterranean schismus	14	30
121	Poaceae	Vulpia octoflora var. hirtella	hairy six-weeks fescue	1	2

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• Plants of Southern California: Regional Floras