Plant Guide to Wiashal Trail, Santa Rosa Plateau

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

Introduction and Explanation of Plant Trail Guides

Highlights of This Trail
Fieldwork Dates and Summary of List Changes With Time
The Plant Guide
Comments On Specific Species


The Wiashal Trail was formerly known as the Multiuse Trail, since bicyclists and horses are allowed on this trail.

This is the steepest, toughest trail of the Santa Rosa Plateau Ecological Reserve. The first 1.5 miles is an easy trail, but the rest of the trail is unlike all the other SRP trails in steepness and poor footing. In particular, the descents from the peaks are sometimes treacherous, with steep sections with deep rutting and loose material over rocks. We have trouble walking down those sections; we can't even imagine how mountain bikers can do those sections at all! But we suppose that is the excitement of this trail for the bikers. (;-)

However, this trail is worth it; it rewards the hiker with a very different aspect of the Santa Rosa Plateau. The trail is lined with hoaryleaf ceanothus and mission manzanita in many places, producing beautiful displays of color from those two species that is not found elsewhere on the Reserve. Many other species line the trail with color in places, including thick-leaved yerba santa, skunkweed and golden yarrow. There are hundreds of goldback ferns, accompanied by a number of California lace ferns, on the eastern descent. The views from the peaks along the trail are spectacular, including a good view of the San Gabriel Mountains and views of the Santa Rosa Plateau Ecological Reserve that cannot be obtained from any other location.

This trail contains some of the oldest chaparral (as measured in time since the last fire) in Southern California. The hoaryleaf ceanothus plants from mile ~0.3 to ~1.0 are all ~15 feet tall, very thin, very crowded, and contain a large percentage of dead stems (before the severe drought year of 2002 as well as afterward). A glance off trail immediately reveals the very low diversity of mature chaparral; there is nothing growing underneath those stems except immediately beside the trail.

Furthermore, there are no young hoaryleaf ceanothus in this section. Hoaryleaf ceanothus only grows from seed after a fire, and the plants live only ~80 years. If there is no fire for ~100 years or more, this species will be extirpated in this area, and have to recolonize this area from neighboring locations.

Except for that section, most of this area was burned in the Turner Fire of 1981.

Wiashal is pronounced wee - uh - shawl.

Trail parameters: The trail is 3.3 miles one way to the bottom, beginning at an elevation of 1800 feet and ending at 1200 feet. The bottom of the trail is 0.3 miles beyond the lower boundary of the Santa Rosa Plateau Ecological Reserve in a Murrieta Open Space Preserve. The one way hike beginning from the visitor center trailhead has an elevation gain of 550 feet and loss of 1150 feet. Doing the trail to the end and back as a round-trip is 6.6 miles, with 1700 feet of elevation gain and loss.

A one-way hike of this trail is possible by shuttling a car to the west end of Single Oak Way in Murrieta. It requires another 0.2 miles to get to your car from the bottom of this trail.

Directions for the car shuttle to do a one-way hike: Turn east onto Calle Del Oso Oro from Clinton Keith Road; turn right (south) onto Calle Cipres (called Via Moreno on the other side of Calle Del Oso Oro; immediately turn left on Placer Creek St, which ends at a T-Jct. with Single Oak Way; turn right and park (Thomas Bros. 927, E5). You'll return to your car through the opening between the houses on the northwest end of Single Oak Way.

To make sure you can find your car from the bottom of the trail, you should either GPS the location of your car, or walk up that opening to familiarize yourself with that area. Although you will at times be able to see your car as you hike down the trail, at the bottom of the trail you may be confused as to how to get to it. At the end of your hike on the trail, turn left at the T-junction and you will soon recognize the area at the opening between the houses if you have familiarized yourself with it beforehand.

Drive your other car to the Visitor Center Parking lot.

Here are a few GPS locations (NAD27 datum; decimal degrees) that might come in handy:

Parking at northwest end of cul-de-sec of Single Oak Way33.56422-117.25152
Bottom of Wiashal Trail33.56267-117.25278
Boundary of Santa Rosa Plateau Ecological Reserve on Wiashal Trail33.56443-117.25485

Directions to trailhead: The signed trailhead is at the northwest corner of the Visitor Center Parking lot, immediately north of the entrance gate.

Highlights of This Trail

The botanical highlights of this trail are:

Number of Unique Taxa On This Trail

The following histogram gives the number of trails in our database that contain each taxon on this trail. There were 90 trails in our database when this histogram was made; 16 of those trails, including this one, are at the Santa Rosa Plateau Ecological Reserve. A number of "1" means the taxon has only been found only on this list, among all the trails in our database; numbers of "16" or smaller may indicate taxa found only in this area.

Number of Trails
Containing A Taxon
Number Of Taxa
On This Trail
% of Taxa
On This Trail
Total Taxa198100%

We found 2 additional species not in the above table, since they have not been fully identified yet. The unidentified ones are marked with ?, sp or ssp in the id? column in the guide, and have no entries in the #all column.

Fieldwork Dates and Summary of List Changes With Time

The following table gives the dates the trail was walked and taxa recorded. After each visit, the table gives the total number of taxa on the list and the breakdown of the taxa without positive identification. See Explanation of Plant Trail Guides to understand the symbols below.

Visit DateVisit ## taxa# "?"# "sp"# "~"# "ssp"Comments
10/26/200217141055only up to mile 2.55 after the severe drought year
12/8/200327231045only to id the Stephanomeria species
5/26/2005415325101only to mile 1.30
8/2/200561792161only to mile 1.71
8/10/200571792161only after mile 1.71

We thank Michael Charters for finding the Mimulus cardinalis at mile 0.09 on 8/4/05, and Rolf Muertter for help with the fieldwork on 4/17/06.

The Plant Guide

Version for printing, without lines and other text on this page: html (8 pages), pdf Clickbook booklet (2 double-sided pages), or Large Type pdf Clickbook booklet (3 double-sided pages). (See printing instructions for an explanation of these options)

The mileages have been adjusted to a GPS recording of the trail, and should be accurate to 0.01-0.02 miles.

MileS#id?Common NameLatin Name#here#all
0.00   Beginning of Wiashal Trail at northwest edge of SRP Visitor Center Parking Lot. This guide begins at the post holding the swinging end of the entrance gate; elevation ~1800 feet (550 m)
0.00b1 California buckwheatEriogonum fasciculatum var. foliolosum99 / 951
0.00l2 saw-toothed goldenbushHazardia squarrosa var. grindelioides99 / 935
0.00b3 *soft chessBromus hordeaceus99 / 940
0.00b4 telegraph weedHeterotheca grandiflora5 / 234
0.00b5 *narrowleaf filagoFilago gallica99 / 945
0.00b6 *shortpod mustardHirschfeldia incana99 / 951
0.00b7 *tocaloteCentaurea melitensis99 / 945
0.00b8 everlasting nest-strawStylocline gnaphaloides99 / 911
0.00b9 *redstem filareeErodium cicutarium99 / 954
0.00b10 holly-leaf navarretiaNavarretia atractyloides1 / 17
0.00b11 strigose lotusLotus strigosus50 / 933
0.00b12 *smooth cat's earHypochaeris glabra99 / 934
0.00b13 San Diego tarweedHemizonia paniculata99 / 97
0.00b14 *Mediterranean schismusSchismus barbatus99 / 922
0.00r15 slender combseedPectocarya linearis ssp. ferocula20 / 27
0.00r16 pygmy-weedCrassula connata99 / 928
0.00r17 small-head field cloverTrifolium microcephalum20 / 99
0.00r18 *short-fruited filareeErodium brachycarpum20 / 316
0.00b19 *red bromeBromus madritensis ssp. rubens99 / 951
0.00r20 fragrant everlastingGnaphalium canescens ssp. beneolens10 / 923
0.00b21 hooked skunkweedNavarretia hamata ssp. hamata99 / 910
0.00b22 Spanish cloverLotus purshianus var. purshianus99 / 930
0.00b23 *nit grassGastridium ventricosum99 / 922
0.00b24 *scarlet pimpernelAnagallis arvensis99 / 931
0.00b25 San Diego birdsfoot lotusLotus hamatus20 / 523
0.00l26~slender popcorn flowerPlagiobothrys tenellus50 / 93
0.00l27 *rattail fescueVulpia myuros var. myuros99 / 921
0.00r28 rattlesnake weedDaucus pusillus99 / 928
0.00r29 slender wreathplantStephanomeria exigua ssp. deanei50 / 912
0.00b30 bristly bird's beakCordylanthus rigidus ssp. setigerus99 / 925
0.00b31 canchalaguaCentaurium venustum99 / 912
0.00l32 California-asterLessingia filaginifolia var. filaginifolia30 / 951
0.00r33 Pomona locoweedAstragalus pomonensis20 / 910
0.00l  Sign: "Wiashal Trail (straight); to Cole Canyon 3.5 mi"
0.00r34 *prickly sow thistleSonchus asper ssp. asper50 / 928
0.00b35 chamiseAdenostoma fasciculatum99 / 937
0.00l36 purple owl's cloverCastilleja exserta ssp. exserta10 / 312
0.00l37 *slender wild oatsAvena barbata99 / 938
0.00r38 golden yarrowEriophyllum confertiflorum var. confertiflorum99 / 953
0.00r39 silver puffsUropappus lindleyi20 / 925
0.00r40 leafy daisyErigeron foliosus var. foliosus50 / 942
0.01l41 Torrey's scrub oakQuercus acutidens30 / 926
0.01r42 deerweedLotus scoparius var. scoparius+30 / 928
0.01l  Jct. bicycle / horse entrance from Clinton Keith Road
0.01r43 popcorn flowerCryptantha intermedia99 / 927
0.01l44 purple clarkiaClarkia purpurea ssp. quadrivulnera50 / 524
0.01l45 rush-roseHelianthemum scoparium5 / 514
0.01r  Check for yellow mariposa lily, Calochortus weedii var. weedii
0.01b46 triangular-fruit sedgeCarex triquetra20 / 916
0.01r47 narrowleaf bedstrawGalium angustifolium ssp. angustifolium30 / 947
0.01b48 redberryRhamnus crocea20 / 915
0.01l49 hoaryleaf ceanothusCeanothus crassifolius99 / 912
0.01r50 blue dicksDichelostemma capitatum ssp. capitatum50 / 945
0.01l51 splendid mariposa lilyCalochortus splendens50 / 917
0.01l52 coast jepsoniaJepsonia parryi30 / 215
0.02b53 foothill needlegrassNassella lepida30 / 920
0.02r54 chaparral yuccaYucca whipplei5 / 531
0.02b55 purple headAcourtia microcephala5 / 319
0.02l56 ground pinkLinanthus dianthiflorus30 / 99
0.03l57 intermediate sun-cupsCamissonia intermedia30 / 96
0.03l58 coast-range melicMelica imperfecta99 / 942
0.03l59 southern honeysuckleLonicera subspicata var. denudata20 / 940
0.03b60 climbing bedstrawGalium nuttallii ssp. nuttallii50 / 930
0.03r61 hollyleaf redberryRhamnus ilicifolia20 / 943
0.04l62 southern Indian pinkSilene laciniata ssp. major2 / 219
0.04l63 bush monkeyflowerMimulus aurantiacus40 / 942
0.04l64 *windmill pinkSilene gallica99 / 932
0.04l65 Parish's purple nightshadeSolanum parishii30 / 920
0.05l66 Tejon cryptanthaCryptantha microstachys10 / 26
0.05l67 basketbushRhus trilobata10 / 524
0.05r68 goldback fernPentagramma triangularis ssp. triangularis99 / 924
0.05l69 blue larkspurDelphinium parryi ssp. parryi30 / 512
0.06r70 mustang mintMonardella lanceolata5 / 15
0.06l71 San Diego peaLathyrus vestitus var. alefeldii2 / 220
0.06l72 seashore bentgrassAgrostis pallens30 / 38
0.07l73 *sow thistleSonchus oleraceus20 / 939
0.07l74 Pacific sanicleSanicula crassicaulis3 / 121
0.07l75 cobwebby thistleCirsium occidentale var. occidentale+3 / 27
0.07r76 California everlastingGnaphalium californicum99 / 942
0.07b77 coast live oakQuercus agrifolia var. agrifolia5 / 542
0.07r78 threadstemPterostegia drymarioides20 / 929
0.07r79 southern miner's lettuceClaytonia perfoliata ssp. mexicana30 / 525
0.07r80 common bedstrawGalium aparine30 / 539
0.07r81 *common chickweedStellaria media30 / 328
0.07r82 giant wild-ryeLeymus condensatus1 / 127
0.07b83 *bull thistleCirsium vulgare+2 / 116
0.07r84 *ripgut bromeBromus diandrus30 / 351
0.07r85 checkerbloomSidalcea malviflora ssp. sparsifolia10 / 325
0.07b86 johnny jump-upViola pedunculata30 / 315
0.07r87ssp*foxtail barleyHordeum murinum10 / 2 
0.07r88 *hedge mustardSisymbrium officinale5 / 220
0.07r89~basket rushJuncus textilis10 / 14
0.07r90 blue wildryeElymus glaucus ssp. glaucus20 / 920
0.07r91 white-flowering currantRibes indecorum3 / 322
0.08b92 goldenrodSolidago californica2 / 134
0.08l93~horseweedConyza canadensis10 / 535
0.08l94 sticky cinquefoilPotentilla glandulosa ssp. glandulosa5 / 115
0.08l95 *prickly lettuceLactuca serriola99 / 942
0.08l96 long-leaved rushJuncus macrophyllus2 / 24
0.08r97 *California burcloverMedicago polymorpha30 / 341
0.08l98 toad rushJuncus bufonius var. bufonius50 / 512
0.08l99 *grass polyLythrum hyssopifolia10 / 213
0.08l  Check for a lupine that appeared here only in 2005
0.08b100 western ragweedAmbrosia psilostachya10 / 136
0.08b101 *hairy rattail fescueVulpia myuros var. hirsuta99 / 916
0.08r102 American vetchVicia americana var. americana2 / 19
0.08b103 narrow-leaved miner's lettuceClaytonia parviflora ssp. parviflora10 / 121
0.08l  (black sage, Salvia mellifera)
0.08l104 *knotweedPolygonum arenastrum2 / 216
0.08l  *Check for Bermuda grass, Cynodon dactylon, probably sighted here in 2005 but absent in 2006.10228
0.08l105 *white-stemmed filareeErodium moschatum10 / 122
0.08l106 *sourcloverMelilotus indicus20 / 122
0.08l107 *Italian rye-grassLolium multiflorum10 / 114
0.08r108 tree cloverTrifolium ciliolatum20 / 510
0.09l  (mule fat, Baccharis salicifolia)
0.09r109 arroyo willowSalix lasiolepis+1 / 133
0.09r  Begin bridge over small drainage. In drainage to left: California fuchsia, Epilobium canum ssp. canum; rabbits-foot grass, Polypogon monspeliensis. In drainage to right: deergrass, Muhlenbergia rigens. In drainage on both sides: scarlet monkeyflower, Mimulus cardinalis.
0.09r110 dwarf lupineLupinus bicolor50 / 929
0.09r111 Durango rootDatisca glomerata1 / 16
0.09b112 wild tarragonArtemisia dracunculus3 / 121
0.09   End bridge
0.09r113 angel's giliaGilia angelensis10 / 214
0.09r114 matchweedGutierrezia sarothrae3 / 29
0.09l115~bristly goldenasterHeterotheca sessiliflora ssp. echioides1 / 17
0.09l116 *wall bedstrawGalium parisiense20 / 17
0.09l117 *Crete weedHedypnois cretica20 / 222
0.09l118 slender madiaMadia gracilis10 / 217
0.10l119 long-stemmed buckwheatEriogonum elongatum var. elongatum1 / 126
0.10b120 three spotOsmadenia tenella20 / 212
0.10r121~purple sanicleSanicula bipinnatifida2 / 111
0.11   Jct. use trail
0.11   Enter chamise forest
0.11l  (California bee plant, Scrophularia californica ssp. floribunda)
0.12l122 papillate dodderCuscuta californica var. papillosa10 / 32
0.12r123 common skullcapScutellaria tuberosa10 / 25
0.13l  Jct. faint path; first of many beautiful patches of canchalagua, Centaurium venustum
0.16l  (common groundsel, Senecio vulgaris)
0.16l124 sharp-toothed sanicleSanicula arguta2 / 218
0.17r125 *long-beaked filareeErodium botrys20 / 39
0.17l126 *curly dockRumex crispus1 / 123
0.17r127 rattlesnake weedChamaesyce albomarginata10 / 17
0.18b128 fringed spineflowerChorizanthe fimbriata var. fimbriata99 / 57
0.18b129 sapphire woolly-starEriastrum sapphirinum99 / 97
0.18l130 deergrassMuhlenbergia rigens+5 / 221
0.18r ~(coyote bush, Baccharis pilularis)
0.19l  (poison oak, Toxicodendron diversilobum)
0.20r131 showy penstemonPenstemon spectabilis var. spectabilis+3 / 111
0.23r  Jct. driveway into 40 acre inholding.
0.23 132 *Russian thistleSalsola tragus1 / 125
0.23r133 *common groundselSenecio vulgaris2 / 119
0.23   Jct. parking lot; elevation 1760 feet (535 m); continue on trail to right.
0.24l134 *pineapple weedChamomilla suaveolens10 / 119
0.24r  (California poppy, Eschscholzia californica)
0.24r  Go through gate; sign: "Trail"
0.24r135 cotton-batting plantGnaphalium stramineum30 / 914
0.27r  Sign: "Mountain Lion...".
0.28l136 black sageSalvia mellifera50 / 940
0.29l137 purple snapdragonAntirrhinum nuttallianum ssp. nuttallianum99 / 917
0.29   Begin uphill section
0.33r138 California lace fernAspidotis californica20 / 99
0.34l139 mission manzanitaXylococcus bicolor99 / 914
0.34l140 wild-cucumberMarah macrocarpus var. macrocarpus5 / 543
0.34   Trail begins series of close-spaced 90° turns; enter forest of hoaryleaf ceanothus, Ceanothus crassifolius, and cross a minor drainage.
0.34l141 meally white pincushionChaenactis artemisiifolia50 / 914
0.35l142 California chicoryRafinesquia californica40 / 922
0.37b143 San Diego wreathplantStephanomeria diegensis30 / 920
0.38r144 caterpillar phaceliaPhacelia cicutaria var. hispida30 / 515
0.38l145 laurel sumacMalosma laurina50 / 942
0.40   Local high point on trail; elevation 1840 feet (560 m)
0.41r146 California peonyPaeonia californica2 / 217
0.42l147 sugar bushRhus ovata5 / 525
0.43l  intermediate sun-cupsCamissonia intermedia+ /  
0.43r  Jct. use trail
0.43l  (honking California bee plant, Scrophularia californica ssp. floribunda)
0.43 148 southern California morning-gloryCalystegia macrostegia ssp. arida+10 / 917
0.44   Trail is flattish here, but continues to descend
0.44r  Check for different Vulpia sp.
0.44r149 false monkeyflowerMimulus pilosus99 / 95
0.48l150 slender sunflowerHelianthus gracilentus50 / 912
0.48l151 thick-leaved yerba santaEriodictyon crassifolium var. crassifolium50 / 97
0.49l  (bird's-foot fern, Pellaea mucronata var. mucronata)
0.50l152 tomcat cloverTrifolium willdenovii20 / 217
0.50r153 floriferous monkeyflowerMimulus floribundus20 / 35
0.50r154 California popcorn flowerPlagiobothrys collinus var. fulvescens5 / 14
0.50l155 *rabbits-foot grassPolypogon monspeliensis3 / 120
0.51 156 *Bermuda grassCynodon dactylon10 / 190
0.52   Local low point on trail, followed by minor local high point then minor local low point
0.53   View of San Jacinto Mountains at 2 o'clock.
0.54b157 yellow pincushionChaenactis glabriuscula var. glabriuscula99 / 913
0.55   Local high point on trail
0.60r  (toyon, Heteromeles arbutifolia)
0.60   Cross small drainage; local low point on trail, followed by a series of minor local high and low points
0.60l158 clustered toad rushJuncus bufonius var. congestus10 / 14
0.66l  Jct. cleared path?
0.67r159 western toad rushJuncus bufonius var. occidentalis10 / 12
0.67r160 slender woolly marblesPsilocarphus tenellus var. tenellus20 / 14
0.67l161 Venus looking-glassTriodanis biflora10 / 12
0.77   Cross small drainage with black culvert
0.77b162 shiny lomatiumLomatium lucidum2 / 17
0.81   Local low point; cross small drainage; elevation ~1750 feet (535 m); climb now steep.
0.90r  southern California morning-gloryCalystegia macrostegia ssp. arida+ /  
0.92l163 bicolored everlastingGnaphalium bicolor10 / 529
0.92l164 chaparral beard-tongueKeckiella antirrhinoides var. antirrhinoides30 / 910
0.92r165 San Diego mountain mahoganyCercocarpus minutiflorus3 / 212
0.97b166 California sagebrushArtemisia californica10 / 446
0.99   First of many local high points; elevation ~1840 feet (560 m)
1.15   Check for different Cuscuta sp.
1.21b167 bird's-foot fernPellaea mucronata var. mucronata10 / 930
1.21   Cross small drainage.
1.28b168 hollyleaf cherryPrunus ilicifolia ssp. ilicifolia5 / 112
1.30b169 common monkeyflowerMimulus guttatus20 / 113
1.30l  deergrassMuhlenbergia rigens /  
1.30b170 variegated cloverTrifolium variegatum20 / 14
1.30b171 wrinkled rushJuncus rugulosus10 / 19
1.30r172 slim vetchVicia ludoviciana var. ludoviciana5 / 18
1.30   Cross dike cutting boulder in trail
1.30   Cross middle of bridge; local low point; elevation ~1755 feet (535 m)
1.30l173 California poppyEschscholzia californica2 / 129
1.32   Cross small drainage
1.32l174 wide-throated yellow monkeyflowerMimulus brevipes5 / 112
1.32l175 rough-seeded blue toad-flaxLinaria canadensis var. texana1 / 110
1.35   Cross small drainage
1.43   View of San Gabriel Mountains at 10 o'clock at a local high point
1.49   Cross small drainage over a black-pipe culvert; elevation ~1755 feet (535 m). Trail now goes upward steeply.
1.54l176 chiaSalvia columbariae20 / 321
1.56l177 wild canterbury bellsPhacelia minor20 / 521
1.57r178 *common cudweedGnaphalium luteo-album / 14
 l179 short-winged deerweedLotus scoparius var. brevialatus+30 / 922
1.59b180 Coulter's snapdragonAntirrhinum coulterianum30 / 95
1.59r181 California suncupCamissonia californica3 / 320
1.59r  Check for new species like a gilia
1.60r182 California filagoFilago californica20 / 921
1.68r  Rock overhang / shelter 5 steps away.
1.68l183 twining snapdragonAntirrhinum kelloggii5 / 26
1.71l  Jct. Overlook trail; elevation ~1920 feet (585 m). Sign: "To Overlook 0.1 mi [left]; Wiashal Trail [right]"
1.78l184 *wild oats (waif?)Avena fatua1 / 125
1.78   Highest point on trail; elevation ~1950 feet (595 m)
2.01r  Jct. use trail
2.02   First of two closely-spaced saddles; elevation ~1750 feet (535 m)
2.10l185 yellow mariposa lilyCalochortus weedii var. weedii30 / 910
2.12r186 white everlastingGnaphalium canescens ssp. microcephalum1 / 136
2.12l187~sand cressCalyptridium monandrum10 / 112
2.13   Local high point; elevation ~1800 feet (550 m)
2.18   Big patch of sapphire woolly-star, Eriastrum sapphirinum
2.19   Second of two closely-spaced saddles; elevation ~1750 feet (535 m)
2.24b188 small-seeded spurgeChamaesyce polycarpa20 / 213
2.27l  Jct. blocked-off trail easily visible only on return trip
2.29   Local peak, elevation ~1840 feet (560 m), with a nice flat rock for sitting on, with great views
2.33l  Jct. trail blocked-off by line of large rocks; note "Eagle Rock" ahead if the light is right.
2.35l  Jct. Second Overlook Trail. Sign: "To Overlook 0.1 mi [left]; Wiashal Trail [right]". Note "Eagle Rock" has turned into "Turkey Vulture" rock, if you are coming back from the Overlook. Most of the many switchbacks on the descent are not noted.
2.40l189 *Italian thistleCarduus pycnocephalus+2 / 218
2.48r190 eucryptaEucrypta chrysanthemifolia var. chrysanthemifolia30 / 526
2.53r  Jct. use trail
2.54   Trail turns left 90°
2.56   Switchback right; (blocked-off old trail continues ahead)
2.60r191 scaly lipfernCheilanthes clevelandii5 / 14
2.62r  (California four o'clock, Mirabilis californica)
2.64r192 wild celeryApiastrum angustifolium10 / 214
2.75r193 California four o'clockMirabilis californica1 / 122
2.75   Switchback left; jct. with new trail going uphill
2.78l194 odoraPorophyllum gracile4 / 46
2.83l195?dead like clarkia, seedling like chinese houses?10 / 1 
2.95r196 California polypodyPolypodium californicum1 / 116
2.99l  5 deergrass plants, Muhlenbergia rigens, above the trail that seem twice normal size since they are above you, instead of their normal position below you in a drainage
2.99l  (San Diego sedge, Carex spissa)
3.00r  Jct. blocked-off trail
3.02l  Sign: "SRPER boundary; Wiashal Trail"
3.19l197 *goldentopLamarckia aurea10 / 123
3.22r  Sign: "No motor vehicles"
3.22l  Sign: "Cole Canyon; (to) Santa Rosa Plateau"
3.22r  Jct. use trail
3.23r198 southern suncupCamissonia bistorta3 / 111
3.23l199 chaparral bush mallowMalacothamnus fasciculatus1 / 114
3.24   T-jct.; go right; sign on left: "No trespassing PC602(J)"
3.26l200 nodding needlegrassNassella cernua3 / 119
3.30b  Jct. trail; sign: "Please stay on trail"
3.30   End trail at T-jct. with a road; elevation 1200 feet (365 m); end plant trail guide; go left to get to the lower trailhead parking on Single Oak Way.
3.34   Road curves right toward back yards of homes
3.36   Trail curves left and parallels back yards of homes
3.41   Y-jct with path; stay right
3.45   Leave road and head toward access in fence
3.49   Cul-de-sac near end of Single Oak Way

Comments On Specific Species

Lotus scoparius. The subspecies are well-segregated on this trail. Mile 0.00 to somewhere before mile 1.74 contains only ssp. scoparius; at and after mile 1.74, all the plants are ssp. brevialatus.

Camissonia intermedia. The identification comes from specimens at mile 0.44 and 2.62; it is possible that the first specimen is not this id, but unlikely.

Cirsium occidentale var. occidentale. The identification of this first specimen comes from specimens at mile 0.24 on this trail and a short distance down this drainage on the Granite Loop Trail. Cirsium vulgare is also found in this location, so the first thistle in other years may be that taxon.

Muhlenbergia rigens, Penstemon spectabilis var. spectabilis. The first specimen on the trail for each of these species found in 2002 was dead in 2004. The first live specimen of Muhlenbergia rigens in 2005 is noted; there were no other specimens of Penstemon spectabilis var. spectabilis.

Cirsium vulgare, Carduus pycnocephalus. These noxious weeds are eliminated when seen, so we hope you don't see it on this trail.

Salix lasiolepis. This is the only mature specimen on the trail. Two subsequent drainages had a number of baby arroyo willows come up in 2005, even though those drainages had no visible mature willows in them, but it isn't clear how long they will survive.

Calystegia macrostegia ssp. arida. The first occurrence of this taxon was not seen in 2006. The first occurrence in 2006 is therefore given later, without a new species number.

About half the plants at the SRP appear to be ssp. arida, with the other half split between sspp. "intermedia" and "tenuifolia". It has long troubled Tom to be finding three subspecies in the small area of the SRP. Worse, the classification of a given plant has changed with time, which was extremely puzzling.

These difficulties were resolved when Tom found clear evidence that subspecies "intermedia" and "tenuifolia" are bogus. Hence we assign all the SRP plants to ssp. arida.

Tom thanks Jane Strong for her considerable assistance with helping him to learn the plants of the Santa Rosa Plateau.

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Copyright © 2002-2006 by Tom Chester and Kay Madore.
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Comments and feedback: Tom Chester
Updated 19 April 2006.