Flora of Butler and Rockhouse Canyons

Butler and Rockhouse Canyons are in the northwest portion of the Clark Valley Area. The portions of those two canyons surveyed as of 1 February 2009 are shown in the following map:

This page gives a preliminary checklist made of the species observed from fieldwork and from vouchers.

The fieldwork in Butler Canyon consisted of a single survey of 1.4 miles on 24 January 2009 by Tom Chester, Michael Crouse, and Michael Charters, beginning 0.55 miles above the junction of Butler and Rockhouse Canyon Roads.

The fieldwork in Rockhouse Canyon consisted of three surveys that covered a total 4.0 miles, beginning 0.4 miles above the junction of Butler and Rockhouse Canyon Roads. The surveys were done by Tom Chester and Michael Crouse on 15 and 28 January 2009, and by Tom Chester and Anne Kelly on 1 February 2009.

All surveys were done before most annual plants were in bloom, and thus many identifications were based on immature plants, or on dead remnants from previous years. Many species are distinctive enough in those forms to result in highly-reliable determinations. Such species are present in the checklist below, but the reader should be aware that even a few of those might turn out to be misidentified. A small number of plants could not be determined to species, or even genus, with 100% confidence, and are not present below.

In the list below, some observed indeterminate species were assigned to the vouchered species, which may not always be correct. For example, dead plants of Loeseliastrum from a year earlier were found in the surveys, that cannot be identified to species without flowers. These were assigned to Loeseliastrum schottii, the only one of the two species that is vouchered here. If both species are present here, some of the observed dead plants may have been L. matthewsii.

All surveys found ubiquitous rosettes of Chaenactis fremontii and / or Malacothrix glabrata. Because those rosettes could not be confidently assigned to either species, no abundance estimates are given of those two species in the checklist below. Future surveys during bloom time will enable abundance estimates to be made of each of these two species.

Future surveys during bloom time will undoubtedly find additional species not present in the list below, so this should be considered only a preliminary list that is incomplete.

The Butler Canyon survey found 68 taxa present in the checklist below, plus the Chaenactis fremontii / Malacothrix glabrata rosettes, and what is probably a Nemacladus species.

The three Rockhouse Canyon surveys found 113 taxa present in the checklist below, plus the Chaenactis fremontii / Malacothrix glabrata rosettes and a second Gilia species.

There are 120 taxa in the checklist below from combining the lists for these two canyons.

A search of the Consortium of California Herbaria on 3 February 2009 yielded 70 vouchers that could be confidently placed in these two canyons, 58 from Butler Canyon and 12 from Rockhouse Canyon. The vast majority of those vouchers, 63 of the 70, were from a single trip by R. Mitchel Beauchamp and R. Pierce on 26 March 1971. The 70 vouchers are of 58 separate taxa.

The checklist contains a total of 147 taxa from the combination of the 120 taxa found in the surveys and the 58 vouchered taxa.

The Checklist is sorted first by category - dicots, monocots, and ferns - and then by family and scientific name. The Family and Scientific Name are from the Jepson Manual, with the Family being given by the first three letters. See Plant Family Abbreviations to decode the abbreviations. An asterisk before the Common Name indicates a non-native species.

Rough estimates of the number of plants and number of locations are given for each species observed in the two canyons. The first number is the number of plants, maxing out at 99; the second number is the number of separate locations, maxing out at 9.

The last columns give the number of vouchers, from Butler Canyon (Bu); Rockhouse Canyon (Rh), and from the entire Clark Valley Floristic Area (CV), which includes the vouchers from Butler and Rockhouse. See Flora of the Clark Valley Area for a plot of many of those voucher locations. My own voucher collections will not appear in the list of vouchers until they have been placed in a herbarium.

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#FAMScientific Name(*)Common NameButler
# Plants
# Plants
# Vouchers
1PTECheilanthes parryiwoolly lipfern2/15/2   
2SELSelaginella eremophiladesert spike-moss 5/1   
3EPHEphedra ~asperaMormon tea30/92/2   
4EPHEphedra californicadesert tea30/950/9   
5ACAJusticia californicachuparosa40/4   1
6ASCSarcostemma hirtellumrambling milkweed30/930/51 1
7ASTAmbrosia dumosaburroweed50/950/9   
8ASTArtemisia ludoviciana ssp. albulawhite mugwort 5/2   
9ASTBaccharis brachyphyllashort-leaved baccharis 1/1   
10ASTBebbia juncea var. asperasweetbush99/999/9 13
11ASTBrickellia desertorumdesert brickellia 20/5   
12ASTChaenactis carphoclinia var. carphocliniapebble pincushion  1 2
13ASTChaenactis fremontiiFremont pincushion  1 3
14ASTChrysothamnus paniculatuspunctate rabbitbrush 99/9 11
15ASTEncelia farinosabrittlebush99/999/9   
16ASTFilago californicaCalifornia filago 30/3   
17ASTGeraea canescenshairy desert-sunflower  1 3
18ASTGutierrezia sarothraematchweed 20/5   
19ASTHymenoclea salsola var. salsolacheesebush99/999/9  1
20ASTLepidospartum squamatumscale-broom 30/5  1
21ASTMalacothrix glabratadesert dandelion  1 2
22ASTPalafoxia arida var. aridadesert needle1/14/3  4
23ASTPerityle emoryiEmory's rock-daisy20/920/31 2
24ASTPleurocoronis plurisetaarrow-leaf50/950/9213
25ASTRafinesquia neomexicanadesert chicory50/999/9   
26ASTSenecio mohavensisMojave ragwort20/920/2   
27ASTStephanomeria exigua ssp. exiguaslender wreathplant  1 1
28ASTStephanomeria pauciflora var. pauciflorawire-lettuce50/999/9   
29ASTStylocline gnaphaloideseverlasting nest-straw 5/1   
30ASTTrixis californica var. californicaCalifornia trixis2/14/3  1
31ASTViguiera parishiiParish's viguiera20/430/7   
32BIGChilopsis linearis ssp. arcuatadesert-willow 50/9   
33BORAmsinckia menziesii var. intermediacommon fiddleneck 5/21 1
34BORCryptantha angustifolianarrow-leaved cryptantha?/??/?1 4
35BORCryptantha barbigerabearded cryptantha ?/?1 1
36BORCryptantha maritimaGuadalupe cryptantha 3/2   
37BORCryptantha micranthapurple-root cryptantha ?/?1 3
38BORCryptantha racemosabushy cryptantha 5/1   
39BORPectocarya recurvatacurvenut combseed1/1   1
40BORTiquilia palmeriPalmer's coldenia3/1   1
41BRABrassica tournefortii*Asian mustard99/999/9  1
42BRACaulanthus halliiHall's caulanthus  112
43BRADescurainia pinnata ssp. glabrasmooth western tansy-mustard5/130/21 1
44BRADithyrea californicaspectacle-pod  1 2
45BRAGuillenia lasiophyllaCalifornia mustard   11
46BRALepidium lasiocarpum var. lasiocarpumhairy-podded pepper-grass5/120/41 2
47BRAStanleya pinnata var. pinnataprince's plume 1/1 11
48CACEchinocereus engelmanniiEngelmann's hedgehog cactus 2/1  1
49CACFerocactus cylindraceusCalifornia barrel cactus5/350/9   
50CACMammillaria dioicaCalifornia fish-hook cactus1/13/3  1
51CACOpuntia basilaris var. basilarisbeavertail cactus3/27/5  2
52CACOpuntia bigeloviiteddy-bear cholla2/199/7   
53CACOpuntia ganderiGander's cholla10/350/9  2
54CAPIsomeris arboreabladderpod 99/9  1
55CHEAtriplex polycarpacattle saltbush 40/4   
56CRADudleya pulverulenta ssp. pulverulentaCalifornia chalk lettuce 5/1   
57CUCCucurbita palmatacoyote melon1/1 1 1
58CUSCuscuta californica var. papillosapapillate dodder  1 1
59EUPChamaesyce arizonicaArizona spurge  1 1
60EUPChamaesyce polycarpasmall-seeded spurge2/230/9  1
61EUPCroton californicusCalifornia croton  1 2
62EUPDitaxis lanceolatanarrowleaf ditaxis5/55/2  1
63EUPStillingia linearifolialinear-leaved stillingia  1 1
64FABAcacia greggiicatclaw50/950/9  1
65FABAstragalus didymocarpus var. didymocarpuswhite dwarf locoweed  1 1
66FABAstragalus palmeriPalmer's milk-vetch   11
67FABCercidium floridum ssp. floridumblue palo verde 7/1   
68FABLotus rigidusdesert lotus 6/3   
69FABLotus scoparius var. brevialatusshort-winged deerweed 1/1 11
70FABLotus strigosusstrigose lotus  1 1
71FABLupinus arizonicusArizona lupine10/920/9113
72FABLupinus concinnusbajada lupine 1/1   
73FABMarina parryiParry's marina 2/2   
74FABMelilotus sp.*clover 30/1   
75FABProsopis glandulosa var. torreyanahoney mesquite 99/4   
76FABPsorothamnus emoryiEmory's indigo-bush10/54/2  4
77FABPsorothamnus schottiiindigo bush50/940/91 2
78FABPsorothamnus spinosussmoke tree 10/3   
79FOUFouquieria splendens ssp. splendensocotillo30/999/9  1
80GERErodium cicutarium*redstem filaree 99/9  1
81HYDEmmenanthe penduliflora var. penduliflorawhispering bells  1 1
82HYDNama demissum var. demissumpurple mat  113
83HYDPhacelia crenulataheliotrope phacelia10/920/9   
84HYDPhacelia crenulata var. minutifloralittle-flowered heliotrope phacelia  4 4
85HYDPhacelia distanscommon phacelia99/999/9114
86KRAKrameria grayiwhite rhatany3/23/2  1
87LAMHyptis emoryidesert-lavender99/999/9  2
88LAMSalvia apianawhite sage 2/2   
89LAMSalvia columbariaechia20/550/9  1
90LAMSalvia eremostachyadesert sage 2/2 11
91LAMSalvia vaseyiVasey's sage3/31/1   
92LOAMentzelia involucratabracted blazing star1/11/11 1
93LOAPetalonyx thurberi ssp. thurberiThurber's sandpaper-plant25/310/4  1
94MALEremalche rotundifoliadesert five-spot1/1   2
95MALSphaeralcea ambiguaapricot mallow 3/3  1
96MALSphaeralcea ambigua var. rosacearosy apricot mallow  1 1
97NYCAbronia villosa var. villosahairy sand-verbena  2 4
98NYCAllionia incarnatatrailing four o'clock  1 1
99NYCMirabilis bigelovii var. retrorsawishbone plant50/999/9  3
100ONACamissonia boothii ssp. condensataBooth's evening primrose 1/1  2
101ONACamissonia californicaCalifornia suncup99/999/9  1
102ONACamissonia cardiophylla ssp. cardiophyllaheartleaf sun-cup2/120/51 1
103ONACamissonia claviformis ssp. peirsoniibrown-eyed primrose99/999/91 3
104ONACamissonia pallida ssp. pallidapale sun-cup 5/11 1
105PAPEschscholzia minutiflora ssp. minutiflorasmall-flowered poppy99/999/91 3
106PAPEschscholzia parishiiParish's poppy  2 2
107PLAPlantago ovatadesert plantain20/1   2
108POLEriastrum eremicum ssp. eremicumdesert woolly-star 20/4   
109POLGilia ~australissouthern gilia 30/3   
110POLGilia latifoliabroad-leaf gilia  1 1
111POLLoeseliastrum schottiiSchott's calico20/25/1  1
112POLChorizanthe brevicornu var. brevicornubrittle spineflower10/13/31 2
113POLEriogonum fasciculatum var. polifoliumCalifornia buckwheat10/95/31 1
114POLEriogonum inflatumdesert trumpet20/920/9   
115POLEriogonum thomasiiThomas' buckwheat10/110/92 4
116POLEriogonum wrightii var. nodosumWright's buckwheat 50/9   
117POLPterostegia drymarioidesthreadstem 10/1   
118PORCalyptridium monandrumsand cress 1/11 1
119RAFPilostyles thurberiThurber's pilostyles 1/1   
120RUBGalium stellatum var. eremicumstar-flowered bedstraw 5/31 1
121RUTThamnosma montanaturpentine broom1/12/1   
122SCRMimulus bigelovii var. bigeloviiBigelow's monkeyflower  1 3
123SCRMohavea confertifloraghost flower  1 2
124SCRPenstemon clevelandii var. connatus?San Jacinto beardtongue 1/1   
125SIMSimmondsia chinensisjojoba3/12/21 5
126SOLDatura sp.desert thornapple1/110/2   
127SOLDatura wrightiisacred datura  1 1
128SOLLycium andersoniiAnderson's desert-thorn7/1    
129SOLNicotiana obtusifoliadesert tobacco4/35/3  1
130SOLPhysalis crassifoliathick-leaved ground cherry 1/11 1
131VISPhoradendron californicumdesert mistletoe10/520/3   
132ZYGFagonia laevisCalifornia fagonia5/12/21 1
133ZYGLarrea tridentatacreosote bush50/999/9  3
134AREWashingtonia filiferaCalifornia fan palm 1/1   
135JUNJuncus mexicanusMexican rush 15/1   
136LILAgave desertidesert agave40/950/9   
137LILHesperocallis undulatadesert lily  1 3
138LILYucca schidigeraMohave yucca 2/1   
139POAAristida purpureapurple three-awn3/35/2   
140POABromus madritensis ssp. rubens*red brome 50/5   
141POACynodon dactylon*Bermuda grass 30/1   
142POADistichlis spicatasaltgrass 20/1   
143POAMuhlenbergia asperifoliascratchgrass 30/1   
144POAPennisetum setaceum*fountain grass 5/2   
145POAPleuraphis rigidabig galleta30/950/9  2
146POASchismus barbatus*Mediterranean schismus50/199/5  2
147TYPTypha domingensissouthern cattail 10/1   

Voucher Data provided by the participants of the Consortium of California Herbaria (ucjeps.berkeley.edu/consortium/).

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Copyright © 2009 by Tom Chester
Permission is freely granted to reproduce any or all of this page as long as credit is given to me at this source:
Comments and feedback: Tom Chester
Last update: 4 February 2009