Flora of Palm Wash Area, Extreme Northwest Imperial County

Fieldwork Results
Procedure For Compiling The Checklist
Important Caveats


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.


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:

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

Important Caveats

Please note the following important caveats about this preliminary Checklist:

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 FamilyScientific Name(*)Common NameVBD
1AmaranthaceaeTidestromia oblongifoliaArizona honeysweet36
2AsclepiadaceaeAsclepias subulatarush milkweed15
3AsteraceaeAdenophyllum porophylloidesSan Felipe dogweed328
4AsteraceaeAmbrosia dumosaburroweed1546
5AsteraceaeBebbia juncea var. asperasweetbush444
6AsteraceaeCalycoseris wrightiiwhite tackstem126
7AsteraceaeChaenactis carphocliniapebble pincushion10
8AsteraceaeChaenactis carphoclinia var. carphocliniapebble pincushion1613
9AsteraceaeChaenactis carphoclinia var. peirsoniiPeirson's pincushion170
10AsteraceaeChaenactis fremontiiFremont pincushion212
11AsteraceaeChaenactis stevioidesdesert pincushion35
12AsteraceaeEncelia farinosabrittlebush1049
13AsteraceaeEncelia frutescensbutton encelia99
14AsteraceaeFilago arizonicaArizona herba impia11
15AsteraceaeGeraea canescenshairy desert-sunflower198
16AsteraceaeHymenoclea salsola var. salsolacheesebush1142
17AsteraceaeIsocoma acradenia var. eremophilasolitary-leaved alkali goldenbush14
18AsteraceaeMalacothrix glabratadesert dandelion818
19AsteraceaeMonoptilon bellioidesdesert star139
20AsteraceaePalafoxia arida var. aridadesert needle1523
21AsteraceaePerityle emoryiEmory's rock-daisy1430
22AsteraceaePeucephyllum schottiipygmy-cedar16
23AsteraceaePluchea sericeaarrow-weed110
24AsteraceaePsathyrotes ramosissimaturtleback43
25AsteraceaeRafinesquia neomexicanadesert chicory1427
26AsteraceaeSenecio mohavensisMojave ragwort419
27AsteraceaeSonchus oleraceus*sow thistle48
28AsteraceaeStephanomeria pauciflora var. pauciflorawire-lettuce445
29AsteraceaeStylocline intertextatangled nest-straw10
30AsteraceaeTrichoptilium incisumyellow-head75
31AsteraceaeXylorhiza orcuttiiOrcutt's woody-aster196
32BoraginaceaeCryptantha angustifolianarrow-leaved cryptantha1820
33BoraginaceaeCryptantha barbigerabearded cryptantha1020
34BoraginaceaeCryptantha costataribbed cryptantha32
35BoraginaceaeCryptantha maritimaGuadalupe cryptantha1815
36BoraginaceaePectocarya heterocarpachuckwalla pectocarya810
37BoraginaceaePectocarya platycarpabroad-fruited combseed23
38BoraginaceaePectocarya recurvatacurvenut combseed412
39BoraginaceaeTiquilia palmeriPalmer's coldenia814
40BoraginaceaeTiquilia plicataplicate coldenia47
41BrassicaceaeBrassica tournefortii*Asian mustard1346
42BrassicaceaeDescurainia pinnata ssp. halictorumalkali western tansy-mustard15
43BrassicaceaeDithyrea californicaspectacle-pod19
44BrassicaceaeDraba cuneifoliawedge-leaved draba10
45BrassicaceaeLepidium lasiocarpum var. lasiocarpumhairy-podded pepper-grass1230
46BrassicaceaeSisymbrium irio*London rocket210
47BrassicaceaeStreptanthella longirostrislongbeak streptanthella24
48CactaceaeOpuntia basilaris var. basilarisbeavertail cactus241
49CactaceaeOpuntia echinocarpasilver cholla119
50CaryophyllaceaeAchyronychia cooperifrost mat49
51ChenopodiaceaeAllenrolfea occidentalisiodine-bush12
52ChenopodiaceaeAtriplex hymenelytradesert holly813
53ChenopodiaceaeChenopodium murale*nettle-leaved goosefoot18
54ChenopodiaceaeSalsola gobicola*hybrid thistle10
55ChenopodiaceaeSalsola paulsenii*Paulsen's Russian thistle40
56EuphorbiaceaeChamaesyce polycarpasmall-seeded spurge640
57FabaceaeAcacia greggiicatclaw244
58FabaceaeAstragalus crotalariaeSalton milk-vetch33
59FabaceaeAstragalus sabulonumgravel milk-vetch10
60FabaceaeCercidium floridum ssp. floridumblue palo verde28
61FabaceaeDalea mollissilky dalea11
62FabaceaeDalea mollissimadowny dalea35
63FabaceaeLotus strigosusstrigose lotus212
64FabaceaeLupinus arizonicusArizona lupine426
65FabaceaeProsopis glandulosa var. torreyanahoney mesquite221
66FabaceaePsorothamnus emoryiEmory's indigo-bush321
67FabaceaePsorothamnus schottiiindigo bush543
68FouquieriaceaeFouquieria splendens ssp. splendensocotillo348
69HydrophyllaceaeNama pusillumsmall-leaved nama10
70HydrophyllaceaePhacelia crenulataheliotrope phacelia16
71HydrophyllaceaePhacelia crenulata var. ambiguaheliotrope phacelia917
72HydrophyllaceaePhacelia neglectaalkali phacelia20
73KrameriaceaeKrameria erectaPima rhatany115
74KrameriaceaeKrameria grayiwhite rhatany337
75LamiaceaeHyptis emoryidesert-lavender244
76LoasaceaeMentzelia involucratabracted blazing star619
77LoasaceaePetalonyx thurberiThurber's sandpaper-plant10
78MalvaceaeEremalche rotundifoliadesert five-spot25
79MalvaceaeHibiscus denudatusrock hibiscus126
80NyctaginaceaeAbronia villosa var. villosahairy sand-verbena610
81NyctaginaceaeAllionia incarnatatrailing four o'clock112
82NyctaginaceaeMirabilis bigelovii var. retrorsaBigelow's desert four-o'clock130
83OnagraceaeCamissonia boothii ssp. condensataBooth's evening primrose726
84OnagraceaeCamissonia californicaCalifornia suncup645
85OnagraceaeCamissonia cardiophylla ssp. cardiophyllaheartleaf sun-cup210
86OnagraceaeCamissonia claviformis ssp. peirsoniibrown-eyed primrose1126
87OnagraceaeOenothera deltoidesdune primrose10
88OrobanchaceaeOrobanche cooperiCooper's broom-rape33
89PapaveraceaeEschscholzia parishiiParish's poppy815
90PlantaginaceaePlantago ovatadesert plantain832
91PolemoniaceaeGilia latifoliabroad-leaf gilia97
92PolemoniaceaeLangloisia setosissima ssp. setosissimabristly langloisia84
93PolemoniaceaeLoeseliastrum matthewsiidesert calico15
94PolygonaceaeChorizanthe brevicornu var. brevicornubrittle spineflower630
95PolygonaceaeChorizanthe corrugatawrinkled spineflower92
96PolygonaceaeChorizanthe rigidadevil's spineflower412
97PolygonaceaeEriogonum deflexum var. deflexumflat-topped buckwheat44
98PolygonaceaeEriogonum deserticolaColorado Desert buckwheat10
99PolygonaceaeEriogonum inflatumdesert trumpet337
100PolygonaceaeEriogonum thomasiiThomas' buckwheat1120
101PolygonaceaeEriogonum trichopeslittle desert trumpet99
102PortulacaceaeCalandrinia ambiguadesert red maids54
103ResedaceaeOligomeris linifolialineleaf whitepuff68
104ScrophulariaceaeMohavea confertifloraghost flower25
105SolanaceaeLycium brevipesdesert-thorn20
106SolanaceaeNicotiana obtusifoliadesert tobacco121
107TamaricaceaeTamarix aphylla*athel12
108TamaricaceaeTamarix ramosissima*saltcedar31
109ViscaceaePhoradendron californicumdesert mistletoe136
110ZygophyllaceaeFagonia pachyacanthasticky fagonia15
111ZygophyllaceaeLarrea tridentatacreosote bush752
112JuncaceaeJuncus cooperiCooper's rush12
113LiliaceaeHesperocallis undulatadesert lily915
114PoaceaeAristida adscensionissix-weeks three-awn1711
115PoaceaeBromus madritensis ssp. rubens*red brome126
116PoaceaeHordeum murinum ssp. glaucum*foxtail barley11
117PoaceaePhalaris minor*little-seed canarygrass30
118PoaceaePleuraphis rigidabig galleta1243
119PoaceaeSchismus arabicus*Mediterranean grass50
120PoaceaeSchismus barbatus*Mediterranean schismus1430
121PoaceaeVulpia octoflora var. hirtellahairy six-weeks fescue12

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Last update: 10 February 2016