Flora of Borrego Palm Canyon
Procedure For Compiling The Checklist
Borrego Palm Canyon is the most famous and most visited area in Anza-Borrego Desert State Park. It was originally called just Palm Canyon, and was well named since it has the third largest collection of palms in California, after Palm Canyon and Murray Canyon in Palm Springs. Randall Henderson, editor and publisher of Desert Magazine, counted 778 palm trees in the winter of 1940. The Canyon was eventually renamed Borrego Palm Canyon to prevent confusion with Palm Canyon in Palm Springs.
The Canyon was the first piece of property in what was then called Borrego Palms Desert State Park, one of the first State Parks in 1933. The Park Headquarters was originally located at the mouth of the Canyon until around 1957. The 1.4 mile Nature Trail leading to the first palm grove was built in 1933 with hand tools by the first park rangers. The Alternate Trail was built in the late 1960s by the La Cima honor camp inmates, and was known as the La Cima trail briefly. (Source for the historical information: Anza-Borrego A to Z, Diana Lindsay, 2001.)
The Canyon is without question one of the most delightful and special places in Anza-Borrego Desert State Park for a number of reasons. Among them are:
- The Canyon has a year-round stream within a narrow canyon. Other streams have more water (Coyote Creek and the San Felipe River have twice as much on average), but none of them tumble down such a steep course in a narrow lengthy canyon.
- The Canyon is simply beautiful with its combination of Palm Oases, riparian habitat, desert vegetation, steep slopes that create plentiful shade, and exposed rock.
- An easy well-marked trail leads to a waterfall and the first Palm Grove.
- Bighorn sheep are frequently seen here.
- The Canyon is extensive. The Canyon's mouth is at an elevation of 800 feet, and its origin is the highest point in San Diego County, 6407 foot Hot Springs Mountain, 10 miles west-northwest of its mouth. The stream drains an area of 22 square miles.
- The Canyon probably has the highest floristic diversity of any area in the Borrego Desert, from the montane forest in its upper reaches to the desert vegetation at its mouth.
The Canyon also is one of the most reliable places to see flowers in the Borrego Desert. It gets more water than places to its east, due to "spillover rain" from the mountain crest to the west during conditions of orographic rain, which is the most frequent type of rain southern California gets in the winter. Borrego Palm Canyon can sometimes get up to an inch of rain from such storms, whereas locations five miles east get nothing.
February and March flowers also survive better here than points east, for reasons I can only speculate about. Even after long periods without rainfall, the annuals on the alluvial slopes away from the stream can look happy here while annuals to the east are dying. This may be due to a combination of increased shade here, resulting in less evaporation from the soil, along with higher humidity levels at night that might give plants extra water from condensation.
The increased shade is due to earlier sunsets from the higher terrain to the west, plus extensive shade within the canyon itself from its southern walls coupled with the low sun angle in the wintertime. Even places not shaded by the southern walls might benefit from lower maximum daytime temperatures due to nearby shade.
This checklist is a pretty good start at a flora of Borrego Palm Canyon for two reasons. First, many botanists have visited the Canyon over a period of decades and collected specimens. Although I haven't yet retrieved the online vouchers for all areas of the Borrego Desert, I'd be very surprised if any other area of the Borrego Desert had more vouchers than here.
Second, I have spent 15 days from 2003 to 2007 surveying the 3.1 mile Nature Trail / Alternate Trail loop. Seven of those days were in the glorious 2005 prime season that produced a number of new records for the Borrego Desert, including Phacelia nashiana, a RARE species (using Jepson Manual parlance) previously known only from parts of Kern and Inyo Counties. On most of those trips I was accompanied by the coauthors of our Plant Guide to that trail. My co-workers and I have also surveyed the Alternate Wash once so far.
Thus the list below is probably the most complete for any area of the Borrego Desert. However, many areas of Borrego Palm Canyon have not yet been explored, so more species will be added to the list in the future.
This checklist is only a start at the flora of this Canyon, since many of the entries come from vouchers I haven't yet reviewed, and I haven't yet vouchered all of the new records I have found so that my determinations can be reviewed. This checklist can only be considered a decent flora after I finish both of those tasks. This checklist will be revised as I work on both of those tasks.
Borrego Palm Canyon is directly west of Borrego Springs:
Only the portion of the Canyon below an elevation of 3000 feet is included in the Flora presented here. The boundaries of this Flora are shown in red in the map below (BPC = Borrego Palm Canyon):
The 3000 feet elevation contour is the jagged line on the left. The straight red lines are the lower-elevation boundaries for this area. The divide on the north is with Henderson Canyon, and the divide on the south is with Hellhole Canyon. The eastern boundary is taken as Borrego Springs Road for now, although I may move that boundary west to the State Park Boundary in the future.
Nearly all of this area in the Canyon is very rugged and has not been explored botanically. The main area of previous study is along the stream and the trails, shown in detail in the next map:
The 1.4 mile long Nature Trail is shown in blue, with two parallel sections in its north-south middle section. The western section is the pre-2003 route; the eastern section is the post-2003 flood route; see details on the changes.
The 1.2 mile Alternate Trail is shown in green. My Plant Guide is to the loop going up the Nature Trail to the first Palm Grove, then retracing the Nature Trail to the junction with the Alternate Trail, and taking the Alternate Trail down.
The red lines near the parking shown the route surveyed on 6 February 2008 for a flora of the Alternate Wash.
Procedure For Compiling The Checklist
The Checklist was compiled from online vouchers and from field work done by myself and coworkers.
The vouchers were obtained from combining several searches of the Consortium of California Herbaria with a search of the San Diego County Plant Atlas, on 7 February 2008.
The first search of the Consortium vouchers retrieved all vouchers bounded by latitudes 33.265 to 33.301° and longitudes of -116.478 and -116.375°. The search retrieved 245 vouchers.
A second search was for all vouchers with the words Borrego and Palm in their locality. (I realized later I should have also searched for Borego, the older spelling for Borrego; I'll do that in the future). That search retrieved 707 vouchers, many of which were in other areas or duplicated taxa found in the first search and were removed. Vouchers that said only Upper Palm Canyon were accepted for now, even though they may have been taken at elevations above 3000 feet. I will work in the future to make sure the final Checklist includes only taxa definitely found below 3000 feet.
The combination of the two searches yielded 384 vouchers of 196 taxa.
Unfortunately, there is no way to search the San Diego County Plant Atlas / San Diego Natural History Museum Herbaria on latitude and longitude, so I couldn't perform the same search for records in the Plant Atlas that have not yet appeared in the Consortium database. But, fortunately, grid cell F23 covers most of my targeted area with only a little extra coverage to the south in the Hellhole Canyon drainage. Grid cell F23 spans latitudes 33.254 to 33.298° and longitudes of -116.458 to -116.430°.
There were 17 additional species found in the Plant Atlas / SD Herbarium vouchers, and I have included them for now in the Flora below. When I get the actual detailed records from the Plant Atlas / SD Herbarium, I will review them and remove those not in the targeted area.
There are thus 213 total taxa vouchered from this Canyon in the Checklist below.
By coincidence, Wayne Armstrong, James Dillane and Michael Charters and I have found the same number of total taxa so far on the loop trail, 213, but our list is substantially different from the list of vouchered taxa. Note that not all of our observed taxa are 100% identified yet, since some were never observed in bloom. Those taxa with only 95% confident determinations are noted in the Checklist.
Of our 213 observed taxa, 119 taxa appear in the list of taxa vouchered from this area, leaving 94 taxa as so-far-unvouchered new records for this Canyon, at least in terms of online vouchers. Of those 94, 29 taxa are recorded in the 1985 Checklist of Vascular Plants of the Anza-Borrego Desert by Duffie Clemons as having been vouchered here or someplace else in Floristic Area #16. Thus at least 65 of those taxa remain to be vouchered.
The number of new records from our trail work is not known yet, since several local herbaria have not finished digitized their vouchers yet. Also, I have already vouchered some of the new taxa found by us, which are counted in the 119 total.
The survey of the Alternate Wash by Wayne Armstrong, Kate Shapiro, Bill Sullivan and myself yielded 57 taxa identified with high enough confidence to list in the following checklist, along with ten other taxa that could not yet be identified due to lack of flowers. Of the 57 taxa, three taxa were species not found on the loop trail, all of which had been vouchered here.
There are thus 216 total taxa that have been located precisely in the field.
The combination of the vouchers and field surveys was then processed to remove probable duplication, and to make the taxa consistent with the 1985 Checklist, by assigning subspecies and varieties to vouchers only determined to the species. The subspecies and varieties were always the nominative ones, which is probably what was meant anyway for the voucher determination, with the exception that the voucher of Artemisia ludoviciana was assigned to ssp. incompta.
The above procedure yielded the 305 taxa given in the checklist below.
Please note the following important caveats about this preliminary Checklist:
- I have not looked at any of the vouchers yet, so I cannot vouch for their determinations. I have checked only the names of the taxa to make sure it was not unreasonable for them to occur here.
- Some of the vouchers may be from higher elevations, and will not appear in later updates of this Checklist.
- Some taxa present in the checklist only from our observations have not been 100% identified yet, since they were never observed in bloom. Those taxa with at least a 95% confident determination are noted in the Checklist with a "~" before their common and scientific names.
- 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 Borrego Palm Canyon
I make the working list available online for two reasons. First, I know others will appreciate having such a list, even if it is preliminary. Second, I hope I will get feedback from others who find errors or omissions in this list.
The Checklist is sorted first by category - ferns, dicots, and monocots - and then by family and scientific name. The Family and Scientific Name are from the Jepson Manual. An asterisk before the Common Name indicates a non-native taxon.
There are four columns that follow the name for each taxa. The first two columns give a rough estimate of the number of plants, and the number of locations for each species, separately for the loop trail (Trail # Plants) and for the Alternate Wash (Alt Wash # Plants). Maximum values are 99 plants, and 9 locations. The main intent of this column is to indicate the species for which I found very few plants or locations. If a given taxa did not occur on the loop trail itself, but was found slightly off-trail, no estimate of the number of plants is given, and the location is set to a value of 1.
The third column (# BPC) gives the number of vouchers found in Borrego Palm Canyon from the procedure detailed above.
The fourth column (#16) gives the information from the 1985 Checklist of Vascular Plants of the Anza-Borrego Desert by Duffie Clemons for Floristic Area #16, the extended Borrego Valley area. A "V" indicates that Duffie found a voucher for that taxon in the San Diego Natural History Museum in Area #16; a "S" indicates only that Duffie or someone he trusted had sighted that taxon in that area.
This is a working list, about which I make no guarantees at all until I officially release it. Use at your own risk!
Version for printing, without lines and other text on this page: html (12 pages) or pdf Clickbook booklet (3 double-sided pages). (See printing instructions for an explanation of these options)
# JM Family Scientific Name (*)Common Name Trail
#16 1 Pteridaceae Adiantum capillus-veneris maidenhair fern 3 V 2 Pteridaceae Cheilanthes covillei beady lipfern 2 V 3 Pteridaceae Cheilanthes parryi woolly lipfern 20/5 20/5 4 V 4 Pteridaceae Cheilanthes viscida sticky lipfern 1 V 5 Pteridaceae Notholaena californica California cloak fern 3/3 2 V 6 Pteridaceae Pellaea mucronata var. mucronata bird's-foot fern 1 V 7 Pteridaceae Pentagramma triangularis ssp. triangularis goldback fern 1 V 8 Selaginellaceae Selaginella eremophila desert spike-moss 50/9 1 V 9 Ephedraceae Ephedra aspera Mormon tea 5 V 10 Ephedraceae Ephedra californica desert tea /1 2 V 11 Ephedraceae Ephedra fasciculata var. clokeyi Clokey's ephedra 1 V 12 Ephedraceae Ephedra nevadensis Nevada ephedra 5/5 V 13 Acanthaceae Carlowrightia arizonica Arizona carlowrightia 5/1 1 V 14 Acanthaceae Justicia californica chuparosa 99/9 99/9 5 V 15 Amaranthaceae Amaranthus albus *tumble pigweed 1/1 16 Amaranthaceae Amaranthus fimbriatus fringed amaranth /1 V 17 Anacardiaceae Rhus ovata sugar bush 1 V 18 Apiaceae Apiastrum angustifolium wild celery 1 V 19 Apiaceae Apium graveolens *celery 1/1 V 20 Apiaceae Daucus pusillus rattlesnake weed 10/2 21 Apiaceae Oenanthe sarmentosa water-parsley 1 V 22 Asclepiadaceae Sarcostemma cynanchoides ssp. hartwegii climbing milkweed 3/3 4 V 23 Asteraceae Adenophyllum porophylloides San Felipe dogweed 5/5 1/1 2 V 24 Asteraceae Ambrosia dumosa burroweed 50/9 50/9 1 V 25 Asteraceae Ambrosia psilostachya western ragweed 30/2 26 Asteraceae Artemisia ludoviciana ssp. albula white mugwort 1 V 27 Asteraceae Baccharis salicifolia mule fat 10/1 1 V 28 Asteraceae Bebbia juncea var. aspera sweetbush 20/9 1 V 29 Asteraceae Brickellia desertorum desert brickellia 1/1 30 Asteraceae Brickellia frutescens shrubby brickellia 1 V 31 Asteraceae Chaenactis artemisiifolia meally white pincushion 20/9 1 V 32 Asteraceae Chaenactis carphoclinia var. carphoclinia pebble pincushion 10/3 10/1 V 33 Asteraceae Chaenactis fremontii Fremont pincushion 99/9 99/9 3 V 34 Asteraceae Conyza canadensis horseweed 1/1 1 V 35 Asteraceae Dicoria canescens desert dicoria /1 V 36 Asteraceae Dimorphotheca sinuata *African daisy 1/1 37 Asteraceae Encelia farinosa brittlebush 99/9 50/9 2 V 38 Asteraceae Ericameria brachylepis boundary goldenbush 1/1 1 V 39 Asteraceae Eriophyllum confertiflorum var. confertiflorum golden yarrow 1 V 40 Asteraceae Eriophyllum wallacei Wallace's woolly daisy 1/1 1 V 41 Asteraceae Filago californica California filago 99/9 V 42 Asteraceae Filago depressa dwarf filago 20/2 43 Asteraceae Gnaphalium luteo-album *common cudweed 2/2 1 V 44 Asteraceae Gnaphalium palustre western marsh cudweed 1/1 45 Asteraceae ~Gnaphalium stramineum ~cotton-batting plant /1 46 Asteraceae Hymenoclea salsola var. salsola cheesebush 99/9 50/9 2 V 47 Asteraceae ~Lactuca serriola ~*prickly lettuce /1 V 48 Asteraceae Malacothrix glabrata desert dandelion 50/7 1 V 49 Asteraceae Matricaria globifera *clustered chamomile 1 V 50 Asteraceae Monoptilon bellioides desert star 2 V 51 Asteraceae Palafoxia arida var. arida desert needle 1 V 52 Asteraceae Pectis papposa var. papposa chinch-weed 20/5 S 53 Asteraceae Perityle emoryi Emory's rock-daisy 99/9 50/9 4 V 54 Asteraceae Pleurocoronis pluriseta arrow-leaf 1/1 2 V 55 Asteraceae Pluchea sericea arrow-weed 5/2 2 V 56 Asteraceae Rafinesquia neomexicana desert chicory 50/9 5/5 2 V 57 Asteraceae Senecio mohavensis Mojave ragwort 99/9 30/5 V 58 Asteraceae Solidago californica goldenrod 10/1 2 V 59 Asteraceae Sonchus asper ssp. asper *prickly sow thistle 1/1 60 Asteraceae ~Sonchus oleraceus ~*sow thistle 2/2 V 61 Asteraceae Stephanomeria exigua ssp. exigua slender wreathplant 1 V 62 Asteraceae Stephanomeria pauciflora var. pauciflora wire-lettuce 4/2 S 63 Asteraceae Stylocline micropoides desert nest straw /1 64 Asteraceae Trixis californica var. californica California trixis 3/3 6 V 65 Asteraceae Uropappus lindleyi silver puffs 5/5 66 Asteraceae Viguiera parishii Parish's viguiera 20/6 3 V 67 Betulaceae Alnus rhombifolia white alder 3 V 68 Bignoniaceae Chilopsis linearis ssp. arcuata desert-willow 10/2 4 V 69 Boraginaceae Amsinckia menziesii var. intermedia common fiddleneck 99/9 20/5 6 V 70 Boraginaceae Amsinckia tessellata devil's lettuce 1 V 71 Boraginaceae Cryptantha angustifolia narrow-leaved cryptantha 2 V 72 Boraginaceae Cryptantha barbigera bearded cryptantha 99/9 1 V 73 Boraginaceae Cryptantha holoptera winged cryptantha 1/1 V 74 Boraginaceae Cryptantha intermedia popcorn flower 99/9 V 75 Boraginaceae Cryptantha maritima Guadalupe cryptantha /1 V 76 Boraginaceae Cryptantha micrantha purple-root cryptantha /1 1 V 77 Boraginaceae Cryptantha muricata prickly cryptantha 10/2 1 V 78 Boraginaceae Pectocarya platycarpa broad-fruited combseed 1 V 79 Boraginaceae Pectocarya recurvata curvenut combseed 99/9 99/9 2 V 80 Brassicaceae Brassica tournefortii *Asian mustard 99/9 99/9 1 V 81 Brassicaceae Capsella bursa-pastoris *shepherd's purse 1 V 82 Brassicaceae Caulanthus hallii Hall's caulanthus 3/1 1 V 83 Brassicaceae Caulanthus heterophyllus var. heterophyllus San Diego jewelflower /1 84 Brassicaceae Caulanthus simulans Payson's wild cabbage 1/1 85 Brassicaceae Descurainia pinnata ssp. glabra smooth western tansy-mustard 4 V 86 Brassicaceae Descurainia pinnata ssp. halictorum alkali western tansy-mustard 99/9 87 Brassicaceae Dithyrea californica spectacle-pod 1 V 88 Brassicaceae Draba cuneifolia wedge-leaved draba 2 V 89 Brassicaceae Guillenia lasiophylla California mustard 10/1 1 V 90 Brassicaceae Lepidium lasiocarpum var. lasiocarpum hairy-podded pepper-grass 99/9 99/9 3 V 91 Brassicaceae Lyrocarpa coulteri var. palmeri Coulter's lyrepod 3/3 V 92 Brassicaceae Rorippa nasturtium-aquaticum water cress 10/1 1 V 93 Brassicaceae Sisymbrium altissimum *tumble-mustard 1 V 94 Brassicaceae Sisymbrium irio *London rocket 99/9 1 V 95 Brassicaceae Sisymbrium orientale *Oriental mustard 20/2 1 V 96 Brassicaceae Streptanthella longirostris longbeak streptanthella 2 V 97 Brassicaceae Thysanocarpus curvipes fringe-pod 10/2 1 V 98 Cactaceae Echinocereus engelmannii Engelmann's hedgehog cactus /1 V 99 Cactaceae Ferocactus cylindraceus California barrel cactus 1/1 2/2 S 100 Cactaceae Mammillaria dioica California fish-hook cactus /1 S 101 Cactaceae Opuntia basilaris var. basilaris beavertail cactus 10/9 2/2 V 102 Cactaceae Opuntia ganderi Gander's cholla 20/9 50/9 1 V 103 Campanulaceae Nemacladus glanduliferus var. glanduliferus glandular nemacladus /1 2 V 104 Caryophyllaceae Achyronychia cooperi frost mat 2/2 2 V 105 Caryophyllaceae Cerastium glomeratum *mouse-ear chickweed /1 106 Caryophyllaceae Loeflingia squarrosa var. squarrosa spreading loeflingia /1 2 V 107 Caryophyllaceae Silene antirrhina snapdragon campion 20/3 1 V 108 Chenopodiaceae Atriplex polycarpa cattle saltbush 5/1 V 109 Chenopodiaceae Chenopodium album *white goosefoot 1/1 110 Chenopodiaceae Chenopodium murale *nettle-leaved goosefoot 20/5 30/1 1 V 111 Crassulaceae Crassula connata pygmy-weed 40/2 99/9 S 112 Crassulaceae Dudleya pulverulenta ssp. pulverulenta California chalk lettuce 1 V 113 Crassulaceae Dudleya saxosa ssp. aloides desert dudleya 1 V 114 Crossosomataceae Crossosoma bigelovii rock crossosoma /1 3 V 115 Cucurbitaceae Cucurbita palmata coyote melon 1 V 116 Cuscutaceae Cuscuta californica var. californica California dodder 1 V 117 Datiscaceae Datisca glomerata Durango root 1/1 1 V 118 Euphorbiaceae Chamaesyce arizonica Arizona spurge 30/3 3 V 119 Euphorbiaceae Chamaesyce micromera Sonoran spurge 3/1 V 120 Euphorbiaceae Chamaesyce polycarpa small-seeded spurge 50/9 5/2 3 V 121 Euphorbiaceae Chamaesyce setiloba Yuma spurge 20/2 V 122 Euphorbiaceae Ditaxis lanceolata narrowleaf ditaxis 99/9 30/9 4 V 123 Euphorbiaceae Euphorbia eriantha beetle spurge 20/5 1 V 124 Fabaceae Acacia greggii catclaw 10/3 3/2 2 V 125 Fabaceae Amorpha fruticosa western false-indigo 3 V 126 Fabaceae Astragalus didymocarpus var. dispermus dwarf white milk-vetch 1 V 127 Fabaceae Astragalus nuttallianus var. cedrosensis Cedros milk-vetch 10/1 V 128 Fabaceae Astragalus palmeri Palmer's milk-vetch 1/1 1 V 129 Fabaceae Dalea mollissima downy dalea 1 V 130 Fabaceae Lotus argophyllus var. argophyllus southern California silver-lotus 1/1 S 131 Fabaceae Lotus hamatus San Diego birdsfoot lotus 99/9 1 V 132 Fabaceae Lotus haydonii pygmy lotus 2 V 133 Fabaceae Lotus oblongifolius var. oblongifolius streambank lotus 1 V 134 Fabaceae Lotus rigidus desert lotus 1 V 135 Fabaceae Lotus salsuginosus var. brevivexillus short-bannered coastal lotus 10/2 V 136 Fabaceae Lotus scoparius var. brevialatus short-winged deerweed 3/3 1 V 137 Fabaceae Lotus strigosus strigose lotus 50/9 1 V 138 Fabaceae Lupinus arizonicus Arizona lupine /1 V 139 Fabaceae Lupinus concinnus bajada lupine 1/1 10/3 3 V 140 Fabaceae Lupinus sparsiflorus Coulter's lupine 99/9 1 V 141 Fabaceae Medicago lupulina *black medick 1 V 142 Fabaceae Medicago polymorpha *California burclover 10/2 143 Fabaceae Melilotus albus *white sweetclover /1 1 V 144 Fabaceae Melilotus indicus *sourclover 30/5 1 V 145 Fabaceae Olneya tesota ironwood /1 V 146 Fabaceae Prosopis glandulosa var. torreyana honey mesquite 30/3 2 V 147 Fabaceae Psorothamnus schottii indigo bush 10/9 10/2 5 V 148 Fabaceae ~Trifolium willdenovii ~tomcat clover /1 149 Fouquieriaceae Fouquieria splendens ssp. splendens ocotillo 10/4 50/9 1 V 150 Geraniaceae Erodium cicutarium *redstem filaree 99/9 99/9 V 151 Geraniaceae Erodium texanum Texas filaree 50/1 1 V 152 Hydrophyllaceae Emmenanthe penduliflora var. penduliflora whispering bells 99/9 99/9 2 V 153 Hydrophyllaceae Eriodictyon trichocalyx var. lanatum smoothleaf yerba santa 2 V 154 Hydrophyllaceae Eriodictyon trichocalyx var. trichocalyx smoothleaf yerba santa /1 155 Hydrophyllaceae Eucrypta chrysanthemifolia var. bipinnatifida eucrypta 20/2 1 V 156 Hydrophyllaceae Nama demissum var. demissum purple mat /1 2 V 157 Hydrophyllaceae Phacelia affinis limestone phacelia /1 158 Hydrophyllaceae Phacelia brachyloba short-lobed phacelia /1 159 Hydrophyllaceae Phacelia cicutaria var. hispida caterpillar phacelia 50/9 V 160 Hydrophyllaceae Phacelia crenulata var. ambigua heliotrope phacelia 1/1 V 161 Hydrophyllaceae Phacelia crenulata var. minutiflora little-flowered heliotrope phacelia 1 V 162 Hydrophyllaceae Phacelia cryptantha limestone phacelia 1 V 163 Hydrophyllaceae Phacelia distans common phacelia 99/9 99/9 8 V 164 Hydrophyllaceae Phacelia longipes long-stalk phacelia 1 V 165 Hydrophyllaceae Phacelia minor wild canterbury bells 99/9 99/9 1 V 166 Hydrophyllaceae Phacelia minor X P. parryi small-flowered wild canterbury bells 1 V 167 Hydrophyllaceae Phacelia nashiana Charlotte's phacelia 30/4 2 V 168 Hydrophyllaceae Phacelia pedicellata pedicellate phacelia 2 V 169 Hydrophyllaceae Phacelia ramosissima var. latifolia branching phacelia 1 V 170 Hydrophyllaceae Pholistoma membranaceum white fiesta flower 99/9 99/9 3 V 171 Krameriaceae Krameria erecta Pima rhatany 20/9 1/1 3 V 172 Krameriaceae Krameria grayi white rhatany 2/2 3 V 173 Lamiaceae Hyptis emoryi desert lavender 99/9 50/9 8 V 174 Lamiaceae Salvia apiana white sage 2 V 175 Lamiaceae Salvia columbariae chia 30/5 30/5 1 V 176 Lamiaceae Salvia eremostachya desert sage 1 V 177 Lamiaceae Salvia vaseyi Vasey's sage 10/3 1/1 5 V 178 Lamiaceae Stachys ajugoides var. rigida rigid hedge-nettle /1 179 Loasaceae Mentzelia desertorum desert blazing star 1 V 180 Loasaceae Petalonyx linearis narrow-leaf sandpaper-plant 1 V 181 Lythraceae Lythrum californicum California loosestrife /1 182 Malvaceae Eremalche exilis white mallow 2 V 183 Malvaceae Hibiscus denudatus rock hibiscus 50/9 5/5 5 V 184 Malvaceae Horsfordia newberryi Newberry's velvet mallow 2/2 1/1 4 V 185 Malvaceae Malacothamnus aboriginum Indian Valley bush mallow 1 V 186 Malvaceae Sphaeralcea ambigua var. ambigua apricot mallow 10/9 2 V 187 Malvaceae Sphaeralcea ambigua var. rosacea rosy apricot mallow 3 V 188 Molluginaceae Mollugo cerviana *carpet-weed 1 V 189 Nyctaginaceae Abronia villosa var. villosa hairy sand-verbena 3 V 190 Nyctaginaceae Allionia incarnata trailing four o'clock 50/9 V 191 Nyctaginaceae Boerhavia coccinea scarlet spiderling 2/2 2 V 192 Nyctaginaceae Boerhavia intermedia fivewing spiderling 99/9 1 V 193 Nyctaginaceae Mirabilis bigelovii var. bigelovii Bigelow's desert four-o'clock 2/2 194 Nyctaginaceae Mirabilis bigelovii var. retrorsa wishbone plant 30/9 3/3 V 195 Nyctaginaceae Mirabilis tenuiloba slender-lobed four o'clock 2 V 196 Onagraceae Camissonia boothii ssp. condensata Booth's desert primrose 2 V 197 Onagraceae Camissonia californica California suncup 99/9 99/9 2 V 198 Onagraceae Camissonia claviformis ssp. peirsonii brown-eyed primrose 30/4 99/9 5 V 199 Onagraceae Camissonia pallida ssp. pallida pale sun-cup 50/9 5 V 200 Onagraceae Camissonia strigulosa strigose sun-cup /1 201 Onagraceae Epilobium canum ssp. canum California fuchsia 1 V 202 Onagraceae Epilobium canum ssp. latifolium mountain California-fuchsia 30/1 1 V 203 Onagraceae ~Oenothera elata ssp. hookeri ~Hooker's evening-primrose 1/1 204 Papaveraceae Argemone munita prickly poppy 3/3 2 V 205 Papaveraceae Eschscholzia minutiflora ssp. minutiflora small-flowered poppy 40/9 1 V 206 Papaveraceae Eschscholzia parishii Parish's poppy 40/9 3 V 207 Plantaginaceae Plantago ovata desert plantain 99/9 208 Platanaceae Platanus racemosa western sycamore /1 4 V 209 Polemoniaceae Eriastrum diffusum miniature woolly-star 2 V 210 Polemoniaceae Eriastrum eremicum ssp. eremicum desert woolly-star 3 V 211 Polemoniaceae Gilia australis southern gilia 10/3 1 V 212 Polemoniaceae Gilia capitata ssp. abrotanifolia globe gilia 1/1 1 V 213 Polemoniaceae Gilia ochroleuca ssp. exilis volcanic gilia 5/2 214 Polemoniaceae Gilia stellata star gilia 30/9 2 V 216 Polemoniaceae Linanthus floribundus ssp. glaber summer snow 1 V 217 Polemoniaceae Loeseliastrum matthewsii desert calico 2 V 218 Polemoniaceae Loeseliastrum schottii Schott's calico 4 V 219 Polygonaceae Chorizanthe brevicornu var. brevicornu brittle spineflower 10/3 1 V 220 Polygonaceae Chorizanthe fimbriata var. laciniata lace-fringed spineflower 1/1 V 221 Polygonaceae Chorizanthe rigida devil's spineflower /1 V 222 Polygonaceae Eriogonum fasciculatum var. polifolium California buckwheat 3/3 1 V 223 Polygonaceae Eriogonum inflatum desert trumpet 20/9 3/3 2 V 224 Polygonaceae Eriogonum reniforme kidney-leaf buckwheat 1 V 225 Polygonaceae Eriogonum thomasii Thomas' buckwheat 3 V 226 Polygonaceae Eriogonum wrightii var. nodosum Wright's buckwheat 5/2 S 227 Polygonaceae Pterostegia drymarioides threadstem 20/9 40/4 1 V 228 Portulacaceae Calandrinia ciliata red maids 1/1 229 Portulacaceae Calyptridium monandrum sand cress 5/2 99/9 4 V 230 Portulacaceae Claytonia parviflora ssp. parviflora narrow-leaved miner's lettuce 5/2 231 Portulacaceae Claytonia parviflora ssp. viridis green miner's lettuce 10/3 232 Portulacaceae Claytonia perfoliata ssp. perfoliata miner's lettuce 1/1 233 Ranunculaceae Delphinium parishii ssp. subglobosum intermediate larkspur 4/2 20/5 2 V 234 Ranunculaceae Ranunculus cymbalaria var. saximontanus Rocky Mountain buttercup 1 V 235 Rosaceae Adenostoma sparsifolium red shanks 1 V 236 Rosaceae Potentilla glandulosa sticky cinquefoil /1 237 Rubiaceae Galium angustifolium ssp. borregoense Borrego bedstraw 3 V 238 Rubiaceae Galium aparine common bedstraw /1 239 Rubiaceae Galium stellatum var. eremicum star-flowered bedstraw /1 5 V 240 Salicaceae Populus fremontii ssp. fremontii Fremont cottonwood 1/1 241 Salicaceae Salix exigua narrowleaf willow /1 6 V 242 Salicaceae Salix laevigata red willow 1/1 243 Scrophulariaceae Antirrhinum coulterianum Coulter's snapdragon 5/1 V 244 Scrophulariaceae Antirrhinum filipes desert twining snapdragon 1/1 1 V 245 Scrophulariaceae Castilleja minor ssp. spiralis lesser paintbrush 1 V 246 Scrophulariaceae Collinsia concolor southern Chinese houses /1 247 Scrophulariaceae Keckiella antirrhinoides var. microphylla little-leaved chaparral beard-tongue 1 V 248 Scrophulariaceae Linaria bipartita *split-lip toadflax 1 V 249 Scrophulariaceae Mimulus aurantiacus bush monkeyflower 1 V 250 Scrophulariaceae Mimulus bigelovii var. bigelovii Bigelow's monkeyflower 20/4 20/2 3 V 251 Scrophulariaceae Mimulus cardinalis scarlet monkeyflower /1 252 Scrophulariaceae Mimulus floribundus floriferous monkeyflower 1/1 253 Scrophulariaceae Mimulus guttatus common monkeyflower 5/1 254 Scrophulariaceae Mimulus parishii Parish's monkeyflower 1 V 255 Scrophulariaceae Mohavea confertiflora ghost flower 1 V 256 Scrophulariaceae Penstemon clevelandii var. clevelandii Cleveland's beardtongue 1 V 257 Scrophulariaceae Veronica anagallis-aquatica *water speedwell 5/2 1 V 258 Simmondsiaceae Simmondsia chinensis jojoba 1 V 259 Solanaceae Datura discolor desert thornapple 30/9 10/9 1 V 260 Solanaceae Datura wrightii sacred datura 10/3 1 V 261 Solanaceae Lycium andersonii Anderson's desert-thorn 6/2 V 262 Solanaceae Nicotiana obtusifolia desert tobacco 2/2 3 V 263 Solanaceae Physalis crassifolia thick-leaved ground cherry 10/9 2 V 264 Solanaceae Solanum douglasii white nightshade 3 V 265 Sterculiaceae Ayenia compacta ayenia 2/2 3/1 4 V 266 Urticaceae Parietaria hespera var. hespera pellitory 99/9 30/3 1 V 267 Viscaceae Phoradendron californicum desert mistletoe 2/2 3 V 268 Vitaceae Vitis girdiana wild grape 1 V 269 Zygophyllaceae Fagonia laevis California fagonia 20/9 1/1 V 270 Zygophyllaceae Larrea tridentata creosote bush 99/9 99/9 V 271 Zygophyllaceae Tribulus terrestris *puncture-vine 1 V 272 Arecaceae Washingtonia filifera California fan palm 20/3 6 V 273 Cyperaceae Eleocharis parishii Parish's spikerush 1 V 274 Cyperaceae Scirpus acutus var. occidentalis common tule 1 V 275 Cyperaceae Scirpus americanus American tule 30/1 276 Juncaceae Juncus mexicanus Mexican rush /1 277 Juncaceae Juncus rugulosus wrinkled rush /1 278 Juncaceae Juncus xiphioides iris-leaved rush 1/1 1 V 279 Liliaceae Allium haematochiton red-skinned onion 3 V 280 Liliaceae Dichelostemma capitatum ssp. capitatum blue dicks 1 V 281 Liliaceae Muilla maritima muilla 10/5 S 282 Orchidaceae Epipactis gigantea stream orchid 1 V 283 Poaceae Agrostis viridis *green bentgrass 10/1 284 Poaceae Aristida adscensionis six-weeks three-awn 30/5 1 V 285 Poaceae Aristida purpurea var. nealleyi Nealley three-awn 1 V 286 Poaceae Aristida ternipes var. hamulosa hook three-awn 1 V 287 Poaceae Avena barbata *slender wild oats 1/1 1 V 288 Poaceae Bothriochloa barbinodis cane bluestem 1 V 289 Poaceae Bouteloua aristidoides var. aristidoides needle grama 30/9 V 290 Poaceae Bouteloua barbata var. barbata six-weeks grama 1 V 291 Poaceae Bromus carinatus var. carinatus California brome 10/3 292 Poaceae Bromus madritensis ssp. rubens *red brome 50/9 50/9 1 V 293 Poaceae Cynodon dactylon *Bermuda grass 5/1 S 294 Poaceae Hordeum murinum ssp. glaucum *foxtail barley /1 295 Poaceae Muhlenbergia microsperma littleseed muhly 1 V 296 Poaceae Muhlenbergia rigens deergrass /1 1 V 297 Poaceae Pennisetum setaceum *fountain grass 5/5 1/1 2 V 298 Poaceae Pleuraphis rigida big galleta 50/9 30/9 2 V 299 Poaceae Poa bigelovii Bigelow's blue grass 1/1 300 Poaceae Polypogon interruptus *ditch beard grass 1 V 301 Poaceae Polypogon monspeliensis *rabbits-foot grass 3/1 1 V 302 Poaceae Schismus barbatus *Mediterranean schismus 99/9 99/9 1 V 303 Poaceae Vulpia bromoides *brome fescue /1 304 Poaceae Vulpia myuros var. hirsuta *hairy rattail fescue 5/1 V 305 Poaceae Vulpia octoflora var. hirtella hairy six-weeks fescue 10/2 V
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Last update: 3 April 2009 (print options added 9 December 2011)