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. 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.
Note added 21 January 2016: the flora has been updated from four subsequent surveys of Borrego Palm Canyon, but the above text has not yet been revised with that information.
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.
Checklist for Borrego Palm Canyon
- Notes on the Scientific Names Used At This Site and
- Information about the order in which the species are presented, and the links from the Scientific Name and Common Name.
An asterisk before the common name indicates a non-native species.
The column #V gives the number of vouchers found in this area, as detailed above.
The column #Pls gives the minimum number of plants observed in the sum of all field surveys, up to a maximum number of 99. An "x" in this column indicates a species for which no abundance estimate has been made. These are almost entirely "wash-down" species, that are present only when brought down from higher elevation by a flash flood. When we next see them, we'll estimate their abundances.
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# Fam Scientific Name (*)Common Name #V #Pls Lycophytes 1 Sel Selaginella eremophila desert spike-moss 3 99 Ferns 2 Equ Equisetum hyemale ssp. affine horsetail 50 3 Pte Adiantum capillus-veneris maidenhair fern 4 53 4 Pte Cheilanthes covillei beady lipfern 2 10 5 Pte Cheilanthes parryi woolly lipfern 9 99 6 Pte Cheilanthes viscida sticky lipfern 4 50 7 Pte Notholaena californica ssp. californica California cloak fern 3 10 8 Pte Pellaea mucronata var. mucronata bird's-foot fern 1 9 Pte Pentagramma triangularis ssp. triangularis goldback fern 2 Gymnosperms 10 Cup Juniperus californica California juniper 3 55 11 Eph Ephedra aspera Mormon tea 6 75 12 Eph Ephedra californica desert tea 2 x Eudicots 13 Aca Carlowrightia arizonica Arizona carlowrightia 2 5 14 Aca Justicia californica chuparosa 7 99 15 Ama Amaranthus albus *tumble pigweed 1 16 Ama Amaranthus fimbriatus fringed amaranth x 17 Ana Rhus ovata sugar bush 2 x 18 Api Apiastrum angustifolium wild celery 2 19 Api Apium graveolens *celery 2 20 Api Daucus pusillus rattlesnake weed 10 21 Api Oenanthe sarmentosa water-parsley 1 22 Apo Funastrum cynanchoides var. hartwegii climbing milkweed 9 21 23 Ast Adenophyllum porophylloides San Felipe dogweed 3 46 24 Ast Ambrosia dumosa burroweed 4 99 25 Ast Ambrosia psilostachya western ragweed 99 26 Ast Ambrosia salsola var. salsola cheesebush 7 99 27 Ast Artemisia ludoviciana ssp. albula white mugwort 1 28 Ast Artemisia ludoviciana ssp. ludoviciana silver wormwood 2 29 Ast Baccharis brachyphylla short-leaved baccharis 1 30 Ast Baccharis salicifolia ssp. salicifolia mule fat 2 16 31 Ast Baccharis sergiloides desert baccharis 1 3 32 Ast Bahiopsis parishii Parish's goldeneye 4 99 33 Ast Baileya pauciradiata Colorado Desert marigold 1 34 Ast Bebbia juncea var. aspera sweetbush 5 99 35 Ast Brickellia desertorum desert brickellia 10 36 Ast Brickellia frutescens shrubby brickellia 1 37 Ast Chaenactis artemisiifolia meally white pincushion 1 20 38 Ast Chaenactis carphoclinia var. carphoclinia pebble pincushion 60 39 Ast Chaenactis fremontii Fremont pincushion 6 99 40 Ast Chaenactis stevioides desert pincushion 1 41 Ast Dicoria canescens desert dicoria x 42 Ast Dimorphotheca sinuata *African daisy 1 43 Ast Encelia farinosa brittlebush 7 99 44 Ast Ericameria brachylepis boundary goldenbush 1 7 45 Ast Erigeron canadensis horseweed 1 12 46 Ast Eriophyllum confertiflorum var. confertiflorum golden yarrow 1 47 Ast Eriophyllum wallacei Wallace's woolly daisy 1 48 Ast Gnaphalium palustre western marsh cudweed 1 49 Ast Gutierrezia sarothrae matchweed 40 50 Ast Isocoma acradenia var. eremophila solitary-leaved alkali goldenbush 1 10 51 Ast Lactuca serriola *prickly lettuce x 52 Ast Logfia depressa dwarf filago 20 53 Ast Logfia filaginoides California filago 1 99 54 Ast Malacothrix glabrata desert dandelion 4 50 55 Ast Malacothrix stebbinsii Stebbins' malacothrix 1 56 Ast Monoptilon bellioides desert star 4 57 Ast Oncosiphon piluliferum *clustered chamomile 1 58 Ast Palafoxia arida var. arida Spanish needle 2 59 Ast Pectis papposa var. papposa chinch-weed 20 60 Ast Perityle emoryi Emory's rock-daisy 8 99 61 Ast Pleurocoronis pluriseta arrow-leaf 6 50 62 Ast Pluchea sericea arrow-weed 2 99 63 Ast Pseudognaphalium biolettii bicolored everlasting 1 64 Ast Pseudognaphalium luteoalbum *common cudweed 1 18 65 Ast Pseudognaphalium stramineum cotton-batting plant x 66 Ast Rafinesquia neomexicana desert chicory 5 57 67 Ast Senecio mohavensis Mojave ragwort 99 68 Ast Solidago velutina ssp. californica goldenrod 2 30 69 Ast Sonchus asper ssp. asper *prickly sow thistle 1 70 Ast Sonchus oleraceus *sow thistle 9 71 Ast Stephanomeria exigua ssp. exigua slender wreathplant 2 72 Ast Stephanomeria pauciflora wire-lettuce 1 54 73 Ast Stylocline micropoides desert nest straw x? 74 Ast Trichoptilium incisum yellow-head 1 75 Ast Trixis californica var. californica California trixis 8 95 76 Ast Uropappus lindleyi silver puffs 5 77 Bet Alnus rhombifolia white alder 3 78 Big Chilopsis linearis ssp. arcuata desert-willow 8 27 79 Bor Amsinckia intermedia common fiddleneck 9 99 80 Bor Amsinckia tessellata var. tessellata bristly fiddleneck 2 81 Bor Cryptantha angustifolia narrow-leaved cryptantha 2 82 Bor Cryptantha barbigera var. barbigera bearded cryptantha 3 99 83 Bor Cryptantha intermedia var. intermedia popcorn flower 99 84 Bor Cryptantha maritima Guadalupe cryptantha 5 85 Bor Cryptantha micrantha var. micrantha red-root cryptantha 1 10 86 Bor Cryptantha muricata prickly cryptantha 1 10 87 Bor Cryptantha racemosa bushy cryptantha 1 88 Bor Emmenanthe penduliflora var. penduliflora whispering bells 6 99 89 Bor Eriodictyon trichocalyx var. lanatum smoothleaf yerba santa 4 26 90 Bor Eucrypta chrysanthemifolia var. bipinnatifida eucrypta 1 20 91 Bor Nama demissa var. demissa purple mat 4 x 92 Bor Pectocarya recurvata curvenut combseed 2 99 93 Bor Phacelia affinis limestone phacelia x 94 Bor Phacelia brachyloba short-lobed phacelia x 95 Bor Phacelia campanularia ssp. campanularia desert bluebells 30 96 Bor Phacelia cicutaria var. hispida caterpillar phacelia 4 50 97 Bor Phacelia crenulata var. ambigua heliotrope phacelia 1 1 98 Bor Phacelia crenulata var. minutiflora little-flowered heliotrope phacelia 1 99 Bor Phacelia cryptantha limestone phacelia 1 100 Bor Phacelia distans common phacelia 9 99 101 Bor Phacelia minor wild canterbury bells 2 99 102 Bor Phacelia pedicellata pedicellate phacelia 5 103 Bor Phacelia ramosissima branching phacelia 1 2 104 Bor Pholistoma membranaceum white fiesta flower 5 99 105 Bra Boechera perennans perennial rock-cress 1 106 Bra Brassica tournefortii *Sahara mustard 2 99 107 Bra Capsella bursa-pastoris *shepherd's purse 1 108 Bra Caulanthus hallii Hall's caulanthus 1 3 109 Bra Caulanthus heterophyllus var. heterophyllus San Diego jewelflower x 110 Bra Caulanthus lasiophyllus California mustard 1 30 111 Bra Caulanthus simulans Payson's wild cabbage 1 112 Bra Descurainia pinnata western tansy-mustard 7 99 113 Bra Dithyrea californica spectacle-pod 1 114 Bra Draba cuneifolia wedge-leaved draba 4 115 Bra Lepidium lasiocarpum ssp. lasiocarpum hairy-podded pepper-grass 3 99 116 Bra Lyrocarpa coulteri Coulter's lyrepod 3 117 Bra Nasturtium officinale water cress 1 99 118 Bra Sisymbrium altissimum *tumble-mustard 1 119 Bra Sisymbrium irio *London rocket 2 99 120 Bra Sisymbrium orientale *Oriental mustard 1 99 121 Bra Streptanthella longirostris longbeak streptanthella 2 122 Bra Thysanocarpus curvipes fringe-pod 1 30 123 Bra Thysanocarpus laciniatus lace-pod 1 124 Cac Cylindropuntia bigelovii teddy-bear cholla 30 125 Cac Cylindropuntia ganderi Gander's cholla 1 99 126 Cac Echinocereus engelmannii Engelmann's hedgehog cactus 25 127 Cac Ferocactus cylindraceus California barrel cactus 2 99 128 Cac Mammillaria dioica California fish-hook cactus 1 35 129 Cac Opuntia basilaris var. basilaris beavertail cactus 99 130 Cam Nemacladus glanduliferus glandular nemacladus 4 x 131 Cam Nemacladus rubescens desert nemacladus 2 132 Car Achyronychia cooperi frost mat 2 2 133 Car Cerastium glomeratum *mouse-ear chickweed x 134 Car Loeflingia squarrosa spreading loeflingia 2 x 135 Car Silene antirrhina snapdragon campion 1 20 136 Che Atriplex polycarpa cattle saltbush 5 137 Che Chenopodium album *white goosefoot 1 138 Che Chenopodium murale *nettle-leaved goosefoot 1 50 139 Con Cuscuta californica var. californica California dodder 1 140 Cra Crassula connata pygmy-weed 99 141 Cra Dudleya saxosa ssp. aloides desert dudleya 1 35 142 Cro Crossosoma bigelovii rock crossosoma 4 75 143 Cuc Cucurbita palmata coyote melon 1 144 Dat Datisca glomerata Durango root 1 2 145 Eup Bernardia incana western bernardia 2 146 Eup Chamaesyce arizonica Arizona spurge 2 30 147 Eup Chamaesyce melanadenia red-gland spurge 1 148 Eup Chamaesyce micromera Sonoran spurge 3 149 Eup Chamaesyce polycarpa small-seeded spurge 4 56 150 Eup Chamaesyce setiloba starfish (Yuma) spurge 20 151 Eup Ditaxis lanceolata narrowleaf ditaxis 9 99 152 Eup Euphorbia eriantha beetle spurge 3 20 153 Fab Acmispon argophyllus var. argophyllus southern California silver-lotus 5 154 Fab Acmispon glaber var. brevialatus short-winged deerweed 1 45 155 Fab Acmispon haydonii pygmy lotus 3 156 Fab Acmispon heermannii var. heermannii silky lotus 1 157 Fab Acmispon maritimus var. brevivexillus short-bannered coastal lotus 10 158 Fab Acmispon micranthus San Diego birdsfoot lotus 2 99 159 Fab Acmispon rigidus desert lotus 1 3 160 Fab Acmispon strigosus strigose lotus 2 50 161 Fab Amorpha fruticosa western false-indigo 4 162 Fab Astragalus nuttallianus var. cedrosensis Cedros milk-vetch 10 163 Fab Astragalus palmeri Palmer's milk-vetch 2 1 164 Fab Dalea mollissima downy dalea 1 165 Fab Lupinus arizonicus Arizona lupine 1 x 166 Fab Lupinus concinnus bajada lupine 5 12 167 Fab Lupinus sparsiflorus Coulter's lupine 1 99 168 Fab Medicago lupulina *black medick 1 169 Fab Medicago polymorpha *California burclover 10 170 Fab Melilotus albus *white sweetclover 1 x 171 Fab Melilotus indicus *sourclover 2 30 172 Fab Olneya tesota ironwood 5 173 Fab Prosopis glandulosa var. torreyana honey mesquite 3 99 174 Fab Psorothamnus schottii indigo bush 9 20 175 Fab Senegalia greggii catclaw 2 99 176 Fab Trifolium willdenovii tomcat clover x 177 Fou Fouquieria splendens ssp. splendens ocotillo 1 99 178 Ger Erodium cicutarium *redstem filaree 99 179 Ger Erodium texanum Texas filaree 50 180 Kra Krameria bicolor white rhatany 5 2 181 Kra Krameria erecta Pima rhatany 4 99 182 Lam Hyptis emoryi desert-lavender 9 99 183 Lam Salvia apiana white sage 2 1 184 Lam Salvia columbariae chia 2 99 185 Lam Salvia eremostachya desert sage 2 1 186 Lam Salvia vaseyi Vasey's sage 9 11 187 Lam Stachys ajugoides var. rigida rigid hedge-nettle 1 x 188 Loa Mentzelia desertorum desert blazing star 1 189 Loa Mentzelia involucrata bracted blazing star 1 190 Lyt Lythrum californicum California loosestrife 22 191 Mal Ayenia compacta ayenia 8 8 192 Mal Hibiscus denudatus rock hibiscus 9 99 193 Mal Horsfordia newberryi Newberry's velvet mallow 7 74 194 Mal Malacothamnus aboriginum Indian Valley bush mallow 1 195 Mal Sphaeralcea ambigua apricot mallow 3 196 Mal Sphaeralcea ambigua var. ambigua apricot mallow 4 99 197 Mal Sphaeralcea ambigua var. rosacea rosy apricot mallow 3 198 Mol Mollugo cerviana *carpet-weed 1 199 Mon Calandrinia ciliata red maids 1 200 Mon Calyptridium monandrum sand cress 5 99 201 Mon Claytonia parviflora ssp. parviflora narrow-leaved miner's lettuce 5 202 Mon Claytonia parviflora ssp. viridis green miner's lettuce 10 203 Mon Claytonia perfoliata ssp. perfoliata miner's lettuce 1 204 Nyc Allionia incarnata trailing four o'clock 50 205 Nyc Boerhavia coccinea scarlet spiderling 6 2 206 Nyc Boerhavia triquetra var. intermedia fivewing spiderling 1 99 207 Nyc Mirabilis laevis var. retrorsa Bigelow's desert four-o'clock 1 73 208 Nyc Mirabilis tenuiloba slender-lobed four o'clock 4 61 209 Ona Camissonia strigulosa strigose suncup x 210 Ona Camissoniopsis pallida ssp. pallida pale suncup 6 50 211 Ona Chylismia claviformis ssp. peirsonii brown-eyed primrose 4 99 212 Ona Epilobium canum ssp. latifolium mountain California-fuchsia 2 99 213 Ona Epilobium ciliatum ssp. ciliatum willowherb 20 214 Ona Eremothera boothii ssp. condensata Booth's evening primrose 3 215 Ona Eulobus californicus California suncup 3 99 216 Ona Oenothera elata ssp. hirsutissima Hooker's evening-primrose 81 217 Oro Castilleja minor ssp. spiralis lesser paintbrush 1 218 Pap Argemone munita prickly poppy 2 3 219 Pap Eschscholzia minutiflora ssp. minutiflora small-flowered poppy 4 40 220 Pap Eschscholzia parishii Parish's poppy 4 40 221 Phr Mimulus aurantiacus var. pubescens long-flowered bush monkeyflower 1 222 Phr Mimulus bigelovii var. bigelovii Bigelow's monkeyflower 6 99 223 Phr Mimulus cardinalis scarlet monkeyflower x 224 Phr Mimulus floribundus floriferous monkeyflower 1 225 Phr Mimulus guttatus common monkeyflower 1 6 226 Pla Antirrhinum coulterianum Coulter's snapdragon 5 227 Pla Antirrhinum filipes desert twining snapdragon 1 1 228 Pla Collinsia concolor southern Chinese houses x 229 Pla Keckiella antirrhinoides var. microphylla little-leaved chaparral beardtongue 3 230 Pla Linaria bipartita *split-lip toadflax 1 231 Pla Mohavea confertiflora ghost flower 3 232 Pla Penstemon clevelandii var. clevelandii Cleveland's beardtongue 1 5 233 Pla Plantago ovata desert plantain 99 234 Pla Veronica anagallis-aquatica *water speedwell 1 5 235 Pla Platanus racemosa western sycamore 4 5 236 Pol Eriastrum diffusum miniature woolly-star 1 237 Pol Eriastrum eremicum ssp. eremicum desert woolly-star 3 238 Pol Gilia capitata ssp. abrotanifolia globe gilia 1 1 239 Pol Gilia ochroleuca ssp. exilis volcanic gilia 5 240 Pol Gilia stellata star gilia 7 30 241 Pol Langloisia setosissima ssp. setosissima bristly langloisia 1 242 Pol Leptosiphon floribundus ssp. glaber summer snow 1 243 Pol Loeseliastrum matthewsii desert calico 3 244 Pol Loeseliastrum schottii Schott's calico 4 245 Pol Saltugilia australis southern gilia 10 246 Pol Chorizanthe brevicornu var. brevicornu brittle spineflower 2 10 247 Pol Chorizanthe fimbriata var. laciniata lace-fringed spineflower 1 248 Pol Chorizanthe rigida devil's spineflower x 249 Pol Eriogonum fasciculatum var. polifolium California buckwheat 1 17 250 Pol Eriogonum inflatum desert trumpet 3 40 251 Pol Eriogonum reniforme kidney-leaf buckwheat 1 252 Pol Eriogonum thomasii Thomas' buckwheat 3 253 Pol Eriogonum wrightii var. nodosum Wright's buckwheat 85 254 Pol Pterostegia drymarioides fairy bowties, threadstem 1 99 255 Pol Rumex conglomeratus *whorled dock 6 256 Ran Delphinium parishii ssp. subglobosum intermediate larkspur 6 25 257 Rha Ziziphus parryi var. parryi lotebush 35 258 Ros Drymocallis glandulosa sticky cinquefoil x? 259 Ros Prunus fremontii desert apricot 1 30 260 Rub Galium angustifolium ssp. borregoense Borrego bedstraw 4 261 Rub Galium aparine common bedstraw x 262 Rub Galium stellatum star-flowered bedstraw 7 65 263 Sal Populus fremontii ssp. fremontii Fremont cottonwood 11 264 Sal Salix exigua var. exigua narrowleaf willow 62 265 Sal Salix laevigata red willow 2 266 Sim Simmondsia chinensis jojoba 1 75 267 Sol Datura discolor desert thornapple 2 40 268 Sol Datura wrightii sacred datura 2 17 269 Sol Lycium andersonii Anderson's boxthorn 99 270 Sol Nicotiana obtusifolia desert tobacco 6 44 271 Sol Physalis crassifolia thick-leaved ground cherry 2 10 272 Sol Solanum douglasii white nightshade 3 1 273 Tam Tamarix sp. *tamarisk 5 274 Urt Parietaria hespera var. hespera pellitory 4 99 275 Urt Urtica dioica ssp. holosericea stinging nettle 10 276 Vis Phoradendron californicum desert mistletoe 4 47 277 Vit Vitis girdiana wild grape 1 278 Zyg Fagonia laevis California fagonia 1 21 279 Zyg Kallstroemia californica California caltrop 1 280 Zyg Larrea tridentata creosote bush 1 99 281 Zyg Tribulus terrestris *puncture-vine 1 Monocots 282 Aga Agave deserti var. deserti desert agave 99 283 Aga Hesperoyucca whipplei chaparral yucca 5 284 All Allium haematochiton red-skinned onion 3 285 Ara Lemna minuta duckweed 99 286 Are Washingtonia filifera California fan palm 7 99 287 Cyp Eleocharis parishii Parish's spikerush 1 50 288 Cyp Schoenoplectus acutus var. occidentalis common tule 1 5 289 Cyp Schoenoplectus americanus American tule 99 290 Jun Juncus mexicanus Mexican rush 99 291 Jun Juncus rugulosus wrinkled rush 20 292 Jun Juncus xiphioides iris-leaved rush 1 41 293 Orc Epipactis gigantea stream orchid 1 294 Poa Aristida adscensionis six-weeks three-awn 2 30 295 Poa Aristida purpurea var. nealleyi Nealley three-awn 1 296 Poa Aristida ternipes var. gentilis hook three-awn 1 297 Poa Avena barbata *slender wild oats 1 6 298 Poa Bothriochloa barbinodis cane bluestem 1 2 299 Poa Bouteloua aristidoides var. aristidoides needle grama 30 300 Poa Bouteloua barbata var. barbata six-weeks grama 1 301 Poa Bromus carinatus var. carinatus California brome 10 302 Poa Bromus diandrus *ripgut brome 30 303 Poa Bromus madritensis ssp. rubens *red brome 2 99 304 Poa Bromus tectorum *downy brome 20 305 Poa Cynodon dactylon *Bermuda grass 5 306 Poa Distichlis spicata saltgrass 11 307 Poa Festuca bromoides *brome fescue x 308 Poa Festuca myuros *rattail fescue 1 5 309 Poa Festuca octoflora hairy six-weeks fescue 10 310 Poa Hilaria rigida big galleta 3 99 311 Poa Hordeum murinum *foxtail barley x 312 Poa Melica frutescens tall melica 16 313 Poa Muhlenbergia microsperma littleseed muhly 1 314 Poa Muhlenbergia rigens deergrass 1 3 315 Poa Pennisetum setaceum *fountain grass 2 99 316 Poa Phragmites australis common reed 10 317 Poa Poa bigelovii Bigelow's blue grass 1 318 Poa Polypogon interruptus *ditch beard grass 1 319 Poa Polypogon monspeliensis *rabbits-foot grass 2 28 320 Poa Polypogon viridis *green bentgrass 10 321 Poa Schismus barbatus *Mediterranean schismus 1 99 322 The Dichelostemma capitatum ssp. capitatum blue dicks 1 323 The Muilla maritima muilla 10 324 Typ Typha domingensis southern cattail 70
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Last update: 21 January 2016