Plant Guide to Coyote Trail / N. Trans Preserve Trail / Ranch Road / Oak Tree Trail Loop, 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


This 3.7 mile loop hike, with 300 feet of elevation gain and loss, begins at the Hidden Valley Parking Area. The Coyote Trail branches off Hidden Valley Road immediately past the locked gate at the southwest end of the parking lot, and heads southeast. It ends at the N. Trans Preserve Trail, which travels along a fairly shady route along a branch of Cole Creek for some distance, then leaves the shade to travel past Poppy Hill and meet the other end of Hidden Valley Road. The return trip is via Ranch Road to the old entrance, where we pick up the Oak Tree Trail and N. Trans Preserve Trail to return to the junction with the Coyote Trail.

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 Taxa183100%

We found 0 additional species on this trail 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"

The guide included only the west portion of the Oak Tree Trail and the N. Trans Preserve Trail on 11/18/04. The rest of the loop was added on 6/4/05, with the east portion of the Oak Tree Trail added on 10/2/05. The fieldwork on 8/18/05 was mostly hiking only on the Oak Tree / N. Trans Preserve section.

The Plant Guide

Version for printing, without lines and other text on this page: html (11 pages), or pdf Clickbook booklet (3 double-sided pages). (See printing instructions for an explanation of these options)

Mileages have been checked against GPS points for most of the guide, and hence typical errors should be ~0.02 miles.

MileS#id?Common NameLatin Name#here#all
0.00   Begin guide just before gate at Hidden Valley Trailhead, heading south on Hidden Valley Road; elevation ~1880 feet (573 m)
    Check for brome fescue, Vulpia bromoides, earlier than mile 1.0
0.00b1 *short-fruited filareeErodium brachycarpum99 / 914
0.00b2 *foxtail barleyHordeum murinum ssp. glaucum99 / 915
0.00b3 *smooth cat's earHypochaeris glabra99 / 935
0.00b4 *shortpod mustardHirschfeldia incana99 / 951
0.00b5 nodding needlegrassNassella cernua99 / 915
0.00b6 *narrowleaf filagoFilago gallica99 / 945
0.00b7 *soft chessBromus hordeaceus99 / 940
0.00l8 *red bromeBromus madritensis ssp. rubens99 / 952
0.00l9 Spanish cloverLotus purshianus var. purshianus99 / 931
0.00b10 *redstem filareeErodium cicutarium99 / 955
0.00b11 *California burcloverMedicago polymorpha99 / 940
0.00l12 horseweedConyza canadensis99 / 935
0.00b13 *Italian rye-grassLolium multiflorum99 / 915
0.00b14 *nit grassGastridium ventricosum99 / 923
0.00b15 *wild oatsAvena fatua99 / 926
0.00b16 *ripgut bromeBromus diandrus50 / 551
0.00   Go through entrance on left of gate across road
0.00l17 graceful tarplantHolocarpha virgata ssp. elongata99 / 914
0.00l18 *slender wild oatsAvena barbata99 / 939
0.00b19 *sand spurreySpergularia bocconei99 / 912
0.00r  Sign: "No mountain bikes; no horseback riding".
0.00l20 *knotweedPolygonum arenastrum40 / 917
0.00l  Iron Ranger: "Pay Fees Here"; bench
0.00b21 *jointed goatgrassAegilops cylindrica10 / 14
0.01l22 *prickly lettuceLactuca serriola99 / 942
0.01r23 purple clarkiaClarkia purpurea ssp. quadrivulnera99 / 925
0.01b24 *hairy rattail fescueVulpia myuros var. hirsuta99 / 917
0.01r25 checkerbloomSidalcea malviflora ssp. sparsifolia99 / 925
0.01r26 western vervainVerbena lasiostachys var. lasiostachys3 / 28
0.02r27 *scarlet pimpernelAnagallis arvensis50 / 932
0.02l28 blue dicksDichelostemma capitatum ssp. capitatum40 / 946
0.02l  (prickly sow thistle, Sonchus asper ssp. asper)
0.03l29 *spring vetchVicia sativa ssp. sativa20 / 25
0.04c30 toad rushJuncus bufonius var. bufonius99 / 913
0.04   Begin wood plank bridge over drainage
0.04l31 *curly dockRumex crispus50 / 923
0.04r  (autumn willowweed, Epilobium brachycarpum)
0.04r32 *grass polyLythrum hyssopifolia40 / 714
0.04r33 common spikerushEleocharis macrostachya20 / 311
0.04r34 wrinkled rushJuncus rugulosus99 / 910
0.04l35 *Mediterranean barleyHordeum marinum ssp. gussoneanum10 / 14
0.04   Trail goes uphill
0.04b36 johnny jump-upViola pedunculata99 / 916
0.05r37 Indian milkweedAsclepias eriocarpa20 / 916
0.05r38 sharp-toothed sanicleSanicula arguta30 / 917
0.05r39 California plantainPlantago erecta30 / 214
0.05r  Sign: "Trail closed" for older portion of trail prior to rerouting
0.05r40 shooting starDodecatheon clevelandii ssp. clevelandii50 / 511
0.05l41 Palmer's goldenbushEricameria palmeri var. pachylepis30 / 710
0.05r  (big squirreltail, Elymus multisetus)
0.05r42 slender cottonweedMicropus californicus var. californicus2 / 17
0.06l  (rattlesnake weed, Daucus pusillus)
0.07l  (sow thistle, Sonchus oleraceus)
0.07r43 big squirreltailElymus multisetus3 / 36
0.07r44 blue-eyed grassSisyrinchium bellum99 / 919
0.08l45 coast live oakQuercus agrifolia var. agrifolia20 / 942
0.09r  Sign: "Trail closed" for upper portion of old trail prior to rerouting.
0.10r  (Engelmann oak, Quercus engelmannii)
0.10r46 *sow thistleSonchus oleraceus20 / 940
0.10r  First of ~4 fields of shooting stars, Dodecatheon clevelandii ssp. clevelandii
0.11b47 California-asterLessingia filaginifolia var. filaginifolia50 / 951
0.11   Area here and somewhat before are almost pure Nassella.
0.12   Minor local high point on trail
0.13r48 *windmill pinkSilene gallica50 / 933
0.13r49 dove weedEremocarpus setigerus30 / 924
0.17   Local high point on trail; elevation ~1900 feet (580 m)
0.22l50 vinegar weedTrichostema lanceolatum99 / 913
0.22 51 purple needlegrassNassella pulchra / 19
0.23r  (splendid mariposa lily, Calochortus splendens; coyote bush, Baccharis pilularis)
0.27l52 splendid mariposa lilyCalochortus splendens40 / 918
0.27r53 rattlesnake weedDaucus pusillus99 / 928
0.29r54 Engelmann oakQuercus engelmannii10 / 923
0.29b55 miner's lettuceClaytonia perfoliata ssp. perfoliata20 / 224
0.29b56 common bedstrawGalium aparine99 / 939
0.29l57 common fiddleneckAmsinckia menziesii var. intermedia30 / 717
0.31r58 earth brodiaeaBrodiaea terrestris ssp. kernensis30 / 66
0.31r  (Vasey's prickly-pear, Opuntia vaseyi; white-flowering currant, Ribes indecorum; soap plant, Chlorogalum pomeridianum var. pomeridianum; California everlasting, Gnaphalium californicum)
0.31l59 seashore bentgrassAgrostis pallens5 / 19
0.32r60 *tocaloteCentaurea melitensis99 / 945
0.32r  (hedge parsley, Torilis nodosa)
0.34r  (poison oak, Toxicodendron diversilobum)
0.34r  (Torrey's scrub oak, Quercus acutidens)
0.36   Trail crosses small rock outcrop / dyke and curves right
0.36l  Field of purple clarkia, Clarkia purpurea ssp. quadrivulnera, with lots of variation in petal coloration, including some with 4 clear spots
0.38r  (darnel, Lolium temulentum)
0.38   Trail crosses rock outcrop / dyke and turns right
0.39r  (wild-cucumber, Marah macrocarpus var. macrocarpus)
0.39r61 fragrant everlastingGnaphalium canescens ssp. beneolens40 / 923
0.39r62 California everlastingGnaphalium californicum30 / 942
0.40r  (leafy daisy, Erigeron foliosus var. foliosus; blue elderberry, Sambucus mexicana; soap plant, Chlorogalum pomeridianum var. pomeridianum)
0.43r  (bicolored everlasting, Gnaphalium bicolor; white everlasting, Gnaphalium canescens ssp. microcephalum; San Diego pea, Lathyrus vestitus var. alefeldii)
0.44r63 California bromeBromus carinatus var. carinatus20 / 924
0.45r64 San Diego wreathplantStephanomeria diegensis3 / 321
0.47r  View of the rock outcrop / dyke almost paralleling trail
0.48r65 soap plantChlorogalum pomeridianum var. pomeridianum1 / 118
0.50b66 *goldentopLamarckia aurea10 / 220
0.51r  Jct. N. Trans Preserve Trail; go right on it; elevation ~1860 feet (567 m). Sign: "Coyote Trail; 0.5 mi to Hidden Valley Trailhead; Trans Preserve Trail (left and right); To Adobes 1.3 mi (right)"
0.52   Cross small drainage
0.52r67 rattlesnake weedChamaesyce albomarginata30 / 58
0.53r  (Italian thistle, Carduus pycnocephalus)
0.56l  (southern California morning-glory, Calystegia macrostegia ssp. arida)
0.56r68 dwarf lupineLupinus bicolor20 / 329
0.56r69 San Diego birdsfoot lotusLotus hamatus30 / 324
0.56r70 leafy daisyErigeron foliosus var. foliosus50 / 943
0.56l71 long-stemmed buckwheatEriogonum elongatum var. elongatum3 / 326
0.57l  Curious shallow excavated pit covered with sticks and leaves.
0.57b72 *winter vetchVicia villosa ssp. varia50 / 519
0.57r73 western ragweedAmbrosia psilostachya50 / 936
0.57b74 deergrassMuhlenbergia rigens30 / 921
0.57r  (California oxalis, Oxalis albicans ssp. californica; hollyleaf redberry, Rhamnus ilicifolia)
0.57 75 California sagebrushArtemisia californica3 / 347
0.57   Begin bridge over drainage of a Cole Creek tributary; elevation ~1835 feet (560 m)
0.57b76 common monkeyflowerMimulus guttatus10 / 214
0.57r77 *whorled dockRumex conglomeratus3 / 27
0.57b78 spike primroseEpilobium densiflorum30 / 74
0.57r79 *mouse-ear chickweedCerastium glomeratum5 / 219
0.57l80 Bolander's water-starwortCallitriche heterophylla var. bolanderi5 / 23
0.57l  (western sycamore, Platanus racemosa)
0.57l81 water crowfootRanunculus aquatilis var. capillaceus2 / 12
0.57l82 *rabbits-foot grassPolypogon monspeliensis20 / 521
0.57b83 umbrella sedgeCyperus eragrostis5 / 210
0.57r84 willow-leaved dockRumex salicifolius var. denticulatus2 / 26
0.57l85 knot grassPaspalum distichum3 / 25
0.57l86 *sourcloverMelilotus indicus3 / 123
0.57   End bridge
0.57l  (California peony, Paeonia californica)
0.58b  (annual sunflower, Helianthus annuus)
0.58   Trail begins to ascend
0.58b87 western buttercupRanunculus occidentalis50 / 97
0.58l88 blue larkspurDelphinium parryi ssp. parryi50 / 913
0.58b89 slender madiaMadia gracilis5 / 118
0.58l90 owl's-cloverCastilleja densiflora3 / 17
0.58b91 small-head field cloverTrifolium microcephalum30 / 510
0.58l92 grand mountain dandelionAgoseris grandiflora20 / 310
0.58b93 *cut-leaved geraniumGeranium dissectum20 / 213
0.58l94 climbing bedstrawGalium nuttallii ssp. nuttallii20 / 930
0.58b95 blue wildryeElymus glaucus ssp. glaucus50 / 921
0.58l96 *bull thistleCirsium vulgare40 / 916
0.58r  (basketbush, Rhus trilobata)
0.58r97 hollyleaf redberryRhamnus ilicifolia4 / 443
0.58r98 southern honeysuckleLonicera subspicata var. denudata2 / 140
0.59l99 poison oakToxicodendron diversilobum10 / 443
0.59b100 *hedge parsleyTorilis nodosa99 / 914
0.59l101 giant wild-ryeLeymus condensatus30 / 527
0.59r102 toyonHeteromeles arbutifolia4 / 344
0.59b103 Torrey's scrub oakQuercus acutidens5 / 126
0.59b104 wild-cucumberMarah macrocarpus var. macrocarpus3 / 244
0.59b105 coast-range melicMelica imperfecta20 / 943
0.59b106 Pacific sanicleSanicula crassicaulis20 / 520
0.59b107 white fairy lanternCalochortus albus20 / 12
0.60b108 heartleaf penstemonKeckiella cordifolia10 / 327
0.60l109 San Diego peaLathyrus vestitus var. alefeldii2 / 222
0.60r110 goldback fernPentagramma triangularis ssp. triangularis1 / 126
0.60r111 canchalaguaCentaurium venustum / 13
0.60r112 coast jepsoniaJepsonia parryi+5 / 115
0.61r113 bristly bird's beakCordylanthus rigidus ssp. setigerus / 26
0.61r  (narrowleaf bedstraw, Galium angustifolium ssp. angustifolium)
0.62   Local high point on trail
0.62r  (white sage, Salvia apiana)
0.62l114 chamiseAdenostoma fasciculatum1 / 137
0.62l115 Eastwood manzanitaArctostaphylos glandulosa ssp. zacaensis1 / 111
0.63l  (fringed spineflower, Chorizanthe fimbriata var. fimbriata)
0.64   Weed out and voucher the following plant to confirm the id:
0.64r116~*little horseweedConyza bonariensis+3 / 316
0.65l117 white everlastingGnaphalium canescens ssp. microcephalum2 / 236
0.66   Local low point on trail
0.69   Local high point on trail; elevation ~1860 feet (567 m)
0.69r118 golden yarrowEriophyllum confertiflorum var. confertiflorum5 / 254
0.70   Local low point on trail
0.71b119 *hedge mustardSisymbrium officinale30 / 323
0.71l120 dead milk maidsCardamine californica var. californica+20 / 36
0.72   Local high point on trail
0.73r121 white sageSalvia apiana2 / 237
0.74l  Note old downed flattened tree across stream
0.74l122 narrow-leaved miner's lettuceClaytonia parviflora ssp. parviflora10 / 220
0.74r123~American vetchVicia americana var. americana10 / 39
0.76l124 bird's-foot fernPellaea mucronata var. mucronata3 / 330
0.77l125 California oxalisOxalis albicans ssp. californica5 / 24
0.78b126~*wall bedstrawGalium parisiense20 / 18
0.78l127 *henbitLamium amplexicaule+1 / 18
0.78l128 *common chickweedStellaria media10 / 126
0.78r129 sticky cinquefoilPotentilla glandulosa ssp. glandulosa5 / 316
0.78r130 narrowleaf bedstrawGalium angustifolium ssp. angustifolium2 / 148
0.78   Cross small drainage
0.79l  Jct. use trail to creek
0.80l131 *bristly ox-tonguePicris echioides10 / 210
0.80r  Check for Italian thistle, Carduus pycnocephalus
0.80   Cross a different Cole Creek tributary; elevation ~1840 feet (560 m)
0.80l132 *dallis grassPaspalum dilatatum50 / 58
0.80r  (winged water-starwort, Callitriche marginata)
0.80r133 dense sedgeCarex densa5 / 22
0.80r134 *prickly sow thistleSonchus asper ssp. asper1 / 131
0.80r135 rigid hedge-nettleStachys ajugoides var. rigida10 / 211
0.80r136~cotton-batting plantGnaphalium stramineum5 / 217
0.80l137 variegated cloverTrifolium variegatum20 / 15
0.83l  (closest off-trail white-flowering currant, Ribes indecorum)
0.83l  This just off-trail coyote bush, Baccharis pilularis, has a terminal long-branched inflorescence which is more typical of B. emoryi. But it measures out to be a perfect B. pilularis.
0.92r138 southern California morning-gloryCalystegia macrostegia ssp. arida+3 / 36
0.94l  Jct. cutoff trail to Ranch Road; local high point on trail; elevation ~1880 feet (573 m). Sign: "Cutoff to Ranch Road 0.1 mi (left); to Adobes 0.9 mi (straight)"
0.96r  (yerba mansa, Anemopsis californica, in Cole Creek)
0.97l  (pygmy-weed, Crassula connata)
0.97r  Boulder of Bedford Canyon Formation
0.99r  (Siskiyou aster, Aster lanceolatus ssp. hesperius, in Cole Creek)
1.00b139~*brome fescueVulpia bromoides99 / 95
1.02r  Cross small drainage with deepish hole
1.15r  (California buckwheat, Eriogonum fasciculatum var. foliolosum)
1.18b140 bush lupineLupinus excubitus var. hallii5 / 29
1.19l141 Pomona locoweedAstragalus pomonensis4 / 411
1.20r142 California poppyEschscholzia californica3 / 228
1.22l143 red maidsCalandrinia ciliata30 / 321
1.22l144 small-flowered fiddleneckAmsinckia menziesii var. menziesii20 / 211
1.22   Y-jct; take left branch
1.29   Jct. Hidden Valley Road; elevation ~1880 feet (573 m); go left to Ranch Road
1.29b145 *pineapple weedChamomilla suaveolens30 / 322
1.29   Jct. Ranch Road; go left; sign: "Ranch Road (left-right); To Visitor Center 3.0 mi (left); To Adobes 0.5 mi (right)"
1.29l146 *Crete weedHedypnois cretica50 / 521
1.31r147 *long-beaked filareeErodium botrys30 / 910
1.33r  *little horseweedConyza bonariensis+ /  
1.36l148 *Bermuda grassCynodon dactylon99 / 929
1.40l149 clustered toad rushJuncus bufonius var. congestus50 / 55
1.40l150 telegraph weedHeterotheca grandiflora20 / 334
1.43l151 *annual blue grassPoa annua2 / 211
1.56l152 clustered field sedge (female)Carex praegracilis20 / 16
1.59l  A white-flowered Spanish clover, Lotus purshianus var. purshianus
1.65   (l: mule fat, Baccharis salicifolia; r: Sign: "Main")
1.67l  Jct. cutoff to Trans Preserve Trail; sign: "To Trans Preserve 0.3 mi"
1.67r  Pass through open gate on Ranch Road; Jct. Monument Hill Road
1.71   Cross drainage
1.75   Local high point
1.80r  (Patch of dallis grass, Paspalum dilatatum that did very well during the 2002 drought due to a spring / seep here. The patch became huge in 2005)
1.80r153 *dog-fennelAnthemis cotula+1 / 12
1.87   Cross drainage
1.90 154 baby mule fatBaccharis salicifolia3 / 240
1.91r155 elk thistleCirsium scariosum5 / 510
1.93   Cross drainage
1.94r156 seaside heliotropeHeliotropium curassavicum10 / 29
2.02   Local high point on road; elevation ~1900 feet (580 m)
2.16l157 *darnelLolium temulentum5 / 24
2.16b158 chick lupineLupinus microcarpus var. microcarpus50 / 99
2.18r159 southern miner's lettuceClaytonia perfoliata ssp. mexicana10 / 228
2.21r  (goldenrod, Solidago californica)
2.22b160 *rose cloverTrifolium hirtum50 / 511
2.22l161 cobwebby thistleCirsium occidentale var. occidentale1 / 18
2.22l162 slim vetchVicia ludoviciana var. ludoviciana3 / 19
2.22l  (western sycamore, Platanus racemosa; big leaf mistletoe, Phoradendron macrophyllum)
2.22b163 rusty-haired popcorn flowerPlagiobothrys nothofulvus99 / 911
2.23r164 goldenrodSolidago californica30 / 335
2.29b165 cockleburXanthium strumarium10 / 315
2.29l166 *common cudweedGnaphalium luteo-album2 / 215
2.29l167 arroyo willowSalix lasiolepis3 / 134
2.29l168 Hooker's evening-primroseOenothera elata ssp. hirsutissima5 / 110
2.30l  (Fremont cottonwood, Populus fremontii ssp. fremontii)
2.33r169 hybrid wild-ryeLeymus Xmultiflorus (L. condensatus X L. triticoides)3 / 33
2.33r170 shining willowSalix lucida ssp. lasiandra2 / 13
2.33r171 saltgrassDistichlis spicata30 / 515
2.34l172 thyme-leafed spurgeChamaesyce serpyllifolia ssp. serpyllifolia1 / 14
2.34r173 sand spikerushEleocharis montevidensis1 / 15
2.36r174 autumn willowweedEpilobium brachycarpum20 / 34
2.42b  Field of chick lupine, Lupinus microcarpus var. microcarpus
2.43   Local high point
2.54r  Jct. N. Lomas Trail
2.55   Jct. Tenaja Truck Trail; go left toward gate at old main entrance
2.60b175 western sycamorePlatanus racemosa3 / 126
2.60r  (big leaf mistletoe, Phoradendron macrophyllum)
2.60b  adult mule fatBaccharis salicifolia /  
2.61   Cross branch of Cole Creek; lowest point on route; elevation 1790 feet (545 m)
2.66l176 Mexican rushJuncus mexicanus20 / 216
2.67   Begin Oak Tree Trail at its Ranch Road / Tenaja Truck Trail entrance; elevation ~1795 feet (547 m)
2.67r  (just outside gate across Ranch Road: field bindweed, Convolvulus arvensis and white sweetclover, Melilotus albus)
2.67l  (A large tumbleweed of Russian thistle, Salsola tragus, was here on 11/18/04, but no rooted population was seen.)
2.68r177 *horehoundMarrubium vulgare10 / 431
2.68r  Last fence post of fence
2.68l  Sign: "Oak Tree Trail (straight); to Hidden Valley Trailhead 1.1 mi; to Adobes 2 mi; to Vernal Pool 2.4 mi"
2.69   Y-jct; guide to right path of Oak Tree Loop follows immediately; guide to left path is at the end of this guide
2.69   Guide to western portion of Oak Tree Loop; begin at Y-jct taking right path
2.73l  Badger hole in 2004
2.78l  Bench without a back
2.79   Local high point on trail
2.79 178 purple owl's cloverCastilleja exserta ssp. exserta10 / 413
2.81   Local low point on trail
2.85b179 tree cloverTrifolium ciliolatum20 / 311
2.87r180 white-flowering currantRibes indecorum2 / 222
2.88   Local high point on trail
2.92   Cross small drainage; local low point on trail. Note scoured area in drainage on left lower than rest of drainage.
2.92l  (slender woolly marbles, Psilocarphus tenellus var. tenellus)
2.95r  Trail post "13" (numbers face other direction): " 'The Old Man of the Forest' tree; its interior is rotting"
2.99r  Jct. Trans Preserve Trail; continue on it; sign "Trans Preserve Trail". Trail on left is the other branch of the Oak Tree Loop.
3.20   Local high point on trail
3.25   Jct. Coyote Trail; end plant guide; elevation ~1860 feet (567 m). Return to trailhead via Coyote Trail.
3.73   Hidden Valley Trailhead
2.69l  Guide to eastern portion of Oak Tree Loop; begin at Y-jct taking left path
2.70l  Boulder with mortero
2.72l  Signpost "3": "Outcropping of granite provided perfect growing conditions for this young Engelmann oak"
2.75l ~(Schott's sedge, Carex schottii)
2.78   Signpost "4": "The soil remains somewhat moist throughout the year. Listen for Pacific tree frogs in spring and early summer"
2.79l  white-flowering currantRibes indecorum /  
2.79r181 narrow-leaf milkweedAsclepias fascicularis5 / 29
2.80l sp(cattail, Typha sp.)
2.81   Short fence; sign: "Trail Closed"
2.84r182 meadow-rueThalictrum fendleri var. polycarpum3 / 18
2.84r  Signpost "6": "All the trees ahead are Engelmann oaks; behind you in a coast live oak"
2.86l  Signpost "7": "This Engelmann oak blew down in 1991"
2.87   Cross small drainage
2.88l  Signpost "8" with lichen growing on it! "Note the western sycamore tree across the tenaja"
2.88l  (red willow, Salix laevigata)
2.92l  Short fence; sign: "Trail Closed"
2.92l183 creeping wild ryeLeymus triticoides10 / 19
2.93r  Signpost "10": "Engelmann and coast live oak together. Can you tell which is which?"
2.94   Cross small drainage
2.96b  milk maidsCardamine californica var. californica+ /  
2.96r  Signpost "11": "Huge coast live oak; listen for birds or the wind in its branches"
2.96l  (Portion of bridge from 0.3 miles upstream carried to this point in the creek)
2.99   Jct. Trans Preserve Trail and other branch of the Oak Tree Loop.
3.20   Local high point on trail
3.25   Jct. Coyote Trail; end plant guide; elevation ~1860 feet (567 m). Return to trailhead via Coyote Trail.
3.73   Hidden Valley Trailhead

Comments On Specific Species

Jepsonia parryi. One of the specimens here is extremely unusual. In late 2005, it had six flower stalks from one point, and each of those stalks had 9 flowers! In February 2005, two leaves came from this specimen. This is very unusual; most jepsonia have a single leaf, and a single flower stalk with fewer than four flowers.

Conyza bonariensis. The first specimen on the trail, observed on 2/2/06, was depauperate, making the id a bit uncertain. The next specimen on the trail, with a definite id, is also noted.

Cardamine californica var. californica. The specimen at mile 0.71 was only seen prior to 2002. We suspect it died when a fallen oak tree covered it. The next occurrence of this species is noted later without a new species number.

Calystegia macrostegia ssp. arida. 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.

Lamium amplexicaule, Anthemis cotula. A single plant of each of these non-native species was found and weeded out. The Anthemis cotula was found on 6/4/05 vouchered.

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Copyright © 2004-2006 by Tom Chester and Kay Madore.
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Updated 9 April 2006.