Plant Guide to Granite Loop Trail, Santa Rosa Plateau

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


(more Intro to be supplied)

I have made a separate guide and key, primarily for beginning botanists, that just contains the shrubs and trees that have at least one specimen that is taller than ~1 m (3 feet) on this trail. The guide in this webpage has an overwhelming number of species on it, many of which are not of interest to people who just want to learn the plants with showy flowers.

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

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

I found 1 additional species not in the above table, since it has not been 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"
12/23/200117010  1
1/10/20022799  1
1/26/20023799  1
2/11/200249516  1
3/13/200259712  1
3/20/2002610113  1
4/10/2002710213  1
4/28/200281099  1

I did not distinguish the sp and ~ classifications prior to 12/7/02 for this trail. The trip on 2/28/03 only covered the first 0.15 mile of the trail. On 3/19/03, I added 5 species found on the trail in 2001, but not seen in 2002 or so far in 2003. The trip on 12/8/03 was primarily to identify the Stephanomeria sp., and only the south loop was walked.

On 7/24/05, I moved 4 taxa to only being off-trail, deleted one taxon, and added 6 new taxa to the plant trail guide, giving the net gain of one taxon compared to 5/3/05.

The Plant Guide

Version for printing, without lines and other text on this page (8 pages)

MileS#id?Common NameLatin Name#here#all
0.00   South Trailhead; elevation ~1780 feet (543 m)
0.00l1 toad rushJuncus bufonius var. bufonius99 / 912
0.00l2 California buckwheatEriogonum fasciculatum var. foliolosum99 / 951
0.00r3 six-weeks fescueVulpia octoflora var. octoflora5 / 14
0.00l4 *narrowleaf filagoFilago gallica99 / 945
0.00b5 angel's giliaGilia angelensis99 / 614
0.00r6 slender popcorn flowerPlagiobothrys tenellus / 2
0.00b7 rattlesnake weedDaucus pusillus99 / 928
0.00l8 *rattail fescueVulpia myuros var. myuros99 / 920
0.00b9 *shortpod mustardHirschfeldia incana99 / 951
0.00b10 *scarlet pimpernelAnagallis arvensis99 / 931
0.00b11 *red bromeBromus madritensis ssp. rubens99 / 951
0.00l12 combseedPectocarya penicillata6 / 24
0.00b13 San Diego tarweedHemizonia paniculata99 / 97
0.00r14 *windmill pinkSilene gallica99 / 932
0.00l15 *redstem filareeErodium cicutarium99 / 954
0.00l16 everlasting nest-strawStylocline gnaphaloides99 / 911
0.00b17 *smooth cat's earHypochaeris glabra99 / 934
0.00b18 strigose lotusLotus strigosus99 / 533
0.00l19 silver puffsUropappus lindleyi99 / 925
0.00l20 *ripgut bromeBromus diandrus99 / 951
0.00r21 dwarf athysanusAthysanus pusillus70 / 71
0.00r22 coast live oakQuercus agrifolia var. agrifolia+40 / 942
0.00b23 popcorn flowerCryptantha intermedia99 / 927
    Check for prickly cryptantha, Cryptantha muricata, elsewhere on the trail
0.00r24 purple clarkiaClarkia purpurea ssp. quadrivulnera99 / 924
0.00r25 small-head field cloverTrifolium microcephalum5 / 39
0.00b26 hooked skunkweedNavarretia hamata ssp. hamata99 / 910
0.00r27 pin-point cloverTrifolium gracilentum var. gracilentum / 8
0.00l28 bristly bird's beakCordylanthus rigidus ssp. setigerus99 / 925
0.00l29 *soft chessBromus hordeaceus99 / 940
0.00l30 *nit grassGastridium ventricosum99 / 922
0.00l31 *mouse-ear chickweedCerastium glomeratum99 / 918
0.00l32 chamiseAdenostoma fasciculatum99 / 937
0.00l33 southern honeysuckleLonicera subspicata var. denudata50 / 940
0.00l34 threadstemPterostegia drymarioides20 / 929
0.00r  Sign: "Granite Loop Trail".
0.00r35 blue dicksDichelostemma capitatum ssp. capitatum99 / 945
0.00r36 leafy daisyErigeron foliosus var. foliosus30 / 942
0.00l37 saw-toothed goldenbushHazardia squarrosa var. grindelioides20 / 935
0.00r38 narrowleaf bedstrawGalium angustifolium ssp. angustifolium10 / 947
0.00l39 *tocaloteCentaurea melitensis99 / 945
0.00l40 narrow-leaved miner's lettuceClaytonia parviflora ssp. parviflora20 / 519
0.00r41 Torrey's scrub oakQuercus acutidens25 / 926
0.00r42 tomcat cloverTrifolium willdenovii10 / 117
0.00r43 coast-range melicMelica imperfecta50 / 942
0.00l44 *slender wild oatsAvena barbata10 / 138
0.00r45 triangular-fruit sedgeCarex triquetra20 / 916
0.00r  (goldback fern, Pentagramma triangularis ssp. triangularis)
0.00l  (California peony, Paeonia californica)
0.00r46 *sow thistleSonchus oleraceus5 / 539
0.00r47 wild-cucumberMarah macrocarpus var. macrocarpus20 / 943
0.00l48 California filagoFilago californica50 / 521
0.00l  (slender buckwheat, Eriogonum gracile var. gracile)
0.00b49 sharp-toothed sanicleSanicula arguta20 / 916
0.00l50 rough-seeded blue toad-flaxLinaria canadensis var. texana20 / 310
0.00r51 coast jepsoniaJepsonia parryi99 / 315
0.01b52 goldfieldsLasthenia californica99 / 912
0.01l53 pygmy-weedCrassula connata99 / 228
0.01l54 ground pinkLinanthus dianthiflorus99 / 59
0.01l55 Jurupa Hills sun-cupsCamissonia ignota50 / 93
0.01l  (View of mission manzanita, Xylococcus bicolor.)
0.01l56 canchalaguaCentaurium venustum99 / 912
0.01r57 foothill needlegrassNassella lepida99 / 920
0.01l58 slender wreathplantStephanomeria exigua ssp. deanei99 / 912
0.01l  (bush monkeyflower, Mimulus aurantiacus)
0.02l59 wild celeryApiastrum angustifolium20 / 214
0.02b  (yellow mariposa lily, Calochortus weedii var. weedii)
0.02l60 golden yarrowEriophyllum confertiflorum var. confertiflorum10 / 953
0.02l61 *prickly sow thistleSonchus asper ssp. asper10 / 228
0.03l62 climbing bedstrawGalium nuttallii ssp. nuttallii5 / 530
0.03l63 *annual blue grassPoa annua+2 / 210
0.03l64 rush-roseHelianthemum scoparium2 / 214
0.03l  (redberry, Rhamnus crocea)
0.04l65 deerweedLotus scoparius var. scoparius20 / 328
0.04l66~white everlastingGnaphalium canescens ssp. microcephalum1 / 137
0.04   Begin small uphill
0.04r67 bush monkeyflowerMimulus aurantiacus10 / 942
0.04r68 annual malacothrixMalacothrix clevelandii1 / 12
0.04r69ssppurple snapdragonAntirrhinum nuttallianum ssp. nuttallianum1 / 117
0.04b70 southern Indian pinkSilene laciniata ssp. major10 / 919
0.04b71 Parish's purple nightshadeSolanum parishii10 / 920
0.04r72 hollyleaf redberryRhamnus ilicifolia50 / 943
0.04b73 yellow mariposa lilyCalochortus weedii var. weedii / 10
0.04r  liverworts, mosses
0.05r  Boulder with small hiding place under an overhang.
0.05r74 pellitoryParietaria hespera var. hespera / 7
0.05r75~cotton-batting plantGnaphalium stramineum+1 / 114
0.05r76 redberryRhamnus crocea20 / 915
0.05r77 giant needlegrassAchnatherum coronatum10 / 322
0.06   End small uphill and descend; elevation 1800 feet (549 m)
0.06l  Four tall rocks look like they are having a boring conference, with one poor fellow asleep.
0.06l  (bird's-foot fern, Pellaea mucronata var. mucronata)
0.06l78 matchweedGutierrezia sarothrae10 / 28
0.06l79 California peonyPaeonia californica7 / 517
0.06   Trail bends 90° to left, rounding the tall rocks on left, then 90° to right; view of Mesa de Burro
0.07l80 *shepherd's purseCapsella bursa-pastoris5 / 19
0.07r81 splendid mariposa lilyCalochortus splendens / 17
0.07   Look back at rocks - now the two on the right are a dolphin snuggling with a whale.
0.07r82 papillate dodderCuscuta californica var. papillosa20 / 91
0.07r83 twining snapdragonAntirrhinum kelloggii1 / 16
0.07r84 purple headAcourtia microcephala10 / 919
0.08r85 goldback fernPentagramma triangularis ssp. triangularis2 / 224
0.08l86 shiny lomatiumLomatium lucidum1 / 17
0.08r87 bird's-foot fernPellaea mucronata var. mucronata99 / 930
0.08b88 black sageSalvia mellifera2 / 140
0.09r89 collar lupineLupinus truncatus10 / 224
0.10   earthstar fungus; end this stretch of jepsonia.
0.10l90 common tidy-tipsLayia platyglossa1 / 15
0.10l91 San Diego birdsfoot lotusLotus hamatus50 / 923
0.10l92 Spanish cloverLotus purshianus var. purshianus99 / 930
 r  (San Diego pea, Lathyrus vestitus var. alefeldii)
0.11b93 holly-leaf navarretiaNavarretia atractyloides10 / 17
0.11r94 dwarf lupineLupinus bicolor30 / 329
0.11r95 mustang mintMonardella lanceolata30 / 35
0.12l96 slender buckwheatEriogonum gracile var. gracile50 / 32
0.12l97 purple owl's cloverCastilleja exserta ssp. exserta30 / 312
0.12l  Good patch of ground pinks, Linanthus dianthiflorus, here.
0.12r98 tree cloverTrifolium ciliolatum / 10
0.12r  Upper jct. with steeper old trail.
0.12b99 three spotOsmadenia tenella99 / 312
0.13l100 seashore bentgrassAgrostis pallens20 / 37
0.13r101 slim vetchVicia ludoviciana var. ludoviciana3 / 18
0.14r102 nodding needlegrassNassella cernua / 14
0.14r  Lower jct. with old trail.
0.14l103 *prickly lettuceLactuca serriola50 / 942
0.15r104 *common groundselSenecio vulgaris20 / 318
0.15r105 checkerbloomSidalcea malviflora ssp. sparsifolia99 / 925
0.15b106 California bromeBromus carinatus var. carinatus3 / 323
0.15r107 blue wildryeElymus glaucus ssp. glaucus50 / 420
0.15r108 Fish's milkwortPolygala cornuta var. fishiae2 / 14
0.15b109 poison oakToxicodendron diversilobum50 / 943
0.15b  coast live oakQuercus agrifolia var. agrifolia+ /  
0.15r110 common bedstrawGalium aparine20 / 239
0.17   Leave chaparral; now paralleling drainage on left; nodding needlegrass, Nassella cernua, on right, to compare with purple needlegrass, Nassella pulchra, a bit ahead on left.
0.17l  (cocklebur, Xanthium strumarium)
0.17r111 *California burcloverMedicago polymorpha99 / 340
0.17l112 *sourcloverMelilotus indicus10 / 222
0.17r113 *winter vetchVicia villosa ssp. varia30 / 218
0.17l114 chick lupineLupinus microcarpus var. microcarpus20 / 29
0.17r  (basketbush, Rhus trilobata)
0.17l115 purple needlegrassNassella pulchra99 / 318
0.18r116 western ragweedAmbrosia psilostachya20 / 236
0.18b117 *short-fruited filareeErodium brachycarpum99 / 314
0.18r118 California-asterLessingia filaginifolia var. filaginifolia30 / 951
0.19l119 *pineapple weedChamomilla suaveolens20 / 119
0.19b120 dove weedEremocarpus setigerus20 / 224
0.19b121 johnny jump-upViola pedunculata50 / 415
0.19r122 Engelmann oakQuercus engelmannii1 / 123
0.19r123 long-stemmed buckwheatEriogonum elongatum var. elongatum2 / 126
0.20   Beginning of bridge over drainage; elevation ~1780 feet (543 m); 2 feet of erosion in 2005 exposed concrete base and left one hanging
0.20r  (Pomona locoweed, Astragalus pomonensis)
0.20l  (narrow-leaf milkweed, Asclepias fascicularis)
0.20b  (rabbits-foot grass, Polypogon monspeliensis)
0.20l  (Durango root, Datisca glomerata)
0.20b  (common spikerush, Eleocharis macrostachya)
0.20l  (wrinkled rush, Juncus rugulosus)
0.20l  (common monkeyflower, Mimulus guttatus)
0.20r  (umbrella sedge, Cyperus eragrostis)
0.20r124 willow-leaved dockRumex salicifolius var. denticulatus1 / 15
0.20l  (common cudweed, Gnaphalium luteo-album)
0.20l  (grass poly, Lythrum hyssopifolia)
0.20b  (rigid hedge-nettle, Stachys ajugoides var. rigida)
0.20b125 horseweedConyza canadensis1 / 135
0.20l126 deergrassMuhlenbergia rigens99 / 921
0.20l  (mule fat, Baccharis salicifolia)
0.20r127 arroyo willowSalix lasiolepis1 / 133
0.20l  (willow weed, Polygonum lapathifolium)
0.20   End bridge
0.20b128 hybrid wild-ryeLeymus Xmultiflorus (L. condensatus X L. triticoides)10 / 23
0.20r129 red maidsCalandrinia ciliata / 118
0.20b130 fringe-podThysanocarpus curvipes99 / 29
0.20l  (Indian milkweed, Asclepias eriocarpa)
0.21b131 blue larkspurDelphinium parryi ssp. parryi99 / 412
0.21l  (California maidenhair fern, Adiantum jordanii)
0.21r  (branching phacelia, Phacelia ramosissima var. latifolia)
    Look for later on-trail occurrence of P. ramosissima
0.22l  (blue elderberry, Sambucus mexicana)
0.22l  (California bee plant, Scrophularia californica ssp. floribunda in 2001; dead in 2003)
0.22r132 slender vetchVicia hassei10 / 26
0.22r133 *hedge mustardSisymbrium officinale20 / 320
0.22l  Trail curves around a large clump of giant wild rye, Leymus condensatus.
0.22l134 giant wild-ryeLeymus condensatus20 / 227
0.22l  (woodland star, Lithophragma affine)
0.23r135 Chinese housesCollinsia heterophylla99 / 511
0.23b136 slender madiaMadia gracilis20 / 317
0.25r  (wild canterbury bells, Phacelia minor)
0.25r137 *Australian bromeBromus arenarius20 / 12
  138 California dodderCuscuta californica var. californica10 / 917
0.26l  Top of "flying saucer" rock; elevation ~1800 feet (549 m)
0.27r  Note that a small percentage of angel's gilia flowers here have 4 or 6 petals, not the normal of 5 petals
0.28b139 California lace fernAspidotis californica2 / 19
0.28r140 white-flowering currantRibes indecorum4 / 422
0.31l  Best field of San Diego tarweed, Hemizonia paniculata.
0.31b141 owl's-cloverCastilleja densiflora / 6
0.31r142 rusty-haired popcorn flowerPlagiobothrys nothofulvus5 / 110
0.32b143 *cut-leaved geraniumGeranium dissectum10 / 213
0.32r144 wrinkled rushJuncus rugulosus30 / 48
0.32   Cross small bridge (a short side trail to left on other side)
0.32r145 common spikerushEleocharis macrostachya20 / 210
0.32b146 *grass polyLythrum hyssopifolia99 / 213
0.32b147 winged water-starwortCallitriche marginata5 / 14
0.32b148 *wall bedstrawGalium parisiense10 / 17
0.32r149 *curly dockRumex crispus5 / 322
0.32l150 canyon clarkiaClarkia epilobioides5 / 19
0.32l151 baby blue eyesNemophila menziesii var. menziesii50 / 37
0.34b152 basketbushRhus trilobata10 / 324
0.34r153 toyonHeteromeles arbutifolia2 / 244
0.34l154 goldenrodSolidago californica30 / 334
0.34r155 California sagebrushArtemisia californica1 / 146
0.34r156 San Diego peaLathyrus vestitus var. alefeldii1 / 120
0.34r157 eucryptaEucrypta chrysanthemifolia var. chrysanthemifolia5 / 125
0.36r  Jct. 10' side trail to "hollow-sounding rock" (exfoliating granite in ground)
0.40r  Several coast jepsonias, Jepsonia parryi, with two leaves per plant.
0.43l158 common linanthusLinanthus parviflorus20 / 18
0.44r159 small-flowered fiddleneckAmsinckia menziesii var. menziesii3 / 18
0.45   Leave chaparral, enter drainage filled with mostly deergrass, Muhlenbergia rigens.
0.47l160 one-sided bluegrassPoa secunda ssp. secunda1 / 122
0.47r  Two fields of baby blue eyes and Chinese houses across the swale.
0.48 161 *wild oatsAvena fatua20 / 325
0.49b162 saltgrassDistichlis spicata20 / 314
0.49   Trail parallels double drainage for a short distance, with small drainage on left and main drainage on right.
0.52l  (San Bernardino aster, Aster bernardinus; spike primrose, Epilobium densiflorum)
0.52r  Field of common monkeyflower, Mimulus guttatus, in distance ahead
0.53l  (Vasey's prickly pear, Opuntia vaseyi)
0.53r163 *bull thistleCirsium vulgare1 / 116
0.53b164spsturdy or dense sedgeCarex alma or C. densa5 / 1 
0.53   Cross small bridge over a very small drainage that drains to the right
0.53r165 *common chickweedStellaria media20 / 225
0.53r  (hedge parsley, Torilis nodosa)
0.53b166 southern miner's lettuceClaytonia perfoliata ssp. mexicana20 / 125
0.55r167 Pomona locoweedAstragalus pomonensis10 / 510
0.60r168 western sycamorePlatanus racemosa1 / 125
0.60   Beginning of bridge
0.60r169 mugwortArtemisia douglasiana20 / 227
0.60r170 cockleburXanthium strumarium3 / 114
0.61   End bridge, with best patch of goldenrod, Solidago californica, here.
0.61l171 thyme-leafed spurgeChamaesyce serpyllifolia ssp. serpyllifolia2 / 13
0.61r172 Mexican rushJuncus mexicanus50 / 316
0.62r173 narrow-leaf milkweedAsclepias fascicularis1 / 17
0.62b  (fragrant everlasting, Gnaphalium canescens ssp. beneolens)
0.62r174 *foxtail barleyHordeum murinum ssp. leporinum20 / 214
0.63r175 blue elderberrySambucus mexicana1 / 146
0.65c176 western vervainVerbena lasiostachys var. lasiostachys1 / 17
0.66r177 California everlastingGnaphalium californicum10 / 442
0.67r178 Palmer's goldenbushEricameria palmeri var. pachylepis5 / 110
0.67b179 vinegar weedTrichostema lanceolatum5 / 213
0.67b180 *sand spurreySpergularia bocconei10 / 111
0.68   Cross Waterline Road; elevation ~1758 feet (536 m)
  181 *yellow salsifyTragopogon dubius+5 / 211
0.70b182 graceful tarplantHolocarpha virgata ssp. elongata10 / 114
0.70b183 *rabbits-foot grassPolypogon monspeliensis20 / 119
0.70l184 creeping wild ryeLeymus triticoides10 / 19
0.70r  Jct. Vista Grande Trail
0.72l  (Monolith Rock)
0.73   Trail curves left, then with a short steep section which curves left further near top and then enters a chamise forest
0.78   Oak moss lichen, Evernia prunastri, is the interesting foliose (leaf-like) lichen growing on the shrubs.
0.79r185 California popcorn flowerPlagiobothrys collinus var. fulvescens / 4
0.80r186 false monkeyflowerMimulus pilosus30 / 25
0.82r187 western marsh cudweedGnaphalium palustre20 / 23
0.83   Local high point on trail; elevation ~1770 feet (540 m)
0.88r188 Pacific sanicleSanicula crassicaulis20 / 520
0.89r  Jct. unauthorized path, closed by a serious fence in May 2002.
0.89r189 intermediate sun-cupsCamissonia intermedia15 / 26
0.89r190 minute-flowered cryptanthaCryptantha micromeres3 / 16
0.90   Begin scattered coast live oaks
0.90   Jct. shortcut road to Visitor Center on left; go right
0.94   Leave chamise forest, enter coast live oak woodland
0.96r191 cobwebby thistleCirsium occidentale var. occidentale2 / 27
0.98l192 basket rushJuncus textilis20 / 23
0.98b193 Indian milkweedAsclepias eriocarpa20 / 215
0.98   Jct. "closed trail" to inholding; enter meadow on right; local low point on trail; elevation ~1758 feet (536 m)
0.98l194 grand mountain dandelionAgoseris grandiflora10 / 29
0.99r  (bristly goldenaster, Heterotheca sessiliflora ssp. echioides)
1.01l  Best patch of Chinese houses, Collinsia heterophylla
1.02r195 long-leaved rushJuncus macrophyllus1 / 13
1.02r196 *henbitLamium amplexicaule+3 / 17
1.03l197 bristly goldenasterHeterotheca sessiliflora ssp. echioides20 / 27
1.03l198 American vetchVicia americana var. americana1 / 18
1.04l  View of woodrat's nest in tree to east.
1.04l  Picnic tables
1.06r  (San Diego mountain mahogany, Cercocarpus minutiflorus)
 r  (sticky cinquefoil, Potentilla glandulosa ssp. glandulosa)
1.09r199 fragrant everlastingGnaphalium canescens ssp. beneolens1 / 123
1.14b200 woolly-fruited lomatiumLomatium dasycarpum ssp. dasycarpum20 / 26
1.15r  Jct. old connector trail (to Multiuse Trail), fenced off in 2005
1.16   End trail at north trailhead; elevation 1785 feet (544 m)

Comments On Specific Species

Quercus agrifolia var. agrifolia. The first reported location for this species is a specimen planted in fall 2002. The second reported location is a natural specimen.

Poa annua. The identification is from plants at mile 0.68; it is possible the plants at the first location are P. infirma, which will be checked in the future.

Gnaphalium stramineum. The only specimen on the trail grew under the overhanging boulder, and germinated too late to bloom in 2005 for a definite identification.

Tragopogon dubius, Lamium amplexicaule. These non-native weeds are eliminated when seen, so I hope you do not see them. If you do, yank them out!

I thank Jane Strong for her considerable assistance with helping me to learn the plants of the Santa Rosa Plateau, and Kay Madore for her sharp eyes in helping me find interesting things on this trail. I thank Michael Charters for finding the first Xanthium and Trichostema for the list on 10/07/03.

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Copyright © 2002-2005 by Tom Chester.
Permission is freely granted to reproduce any or all of this page as long as credit is given to me at this source:
Comments and feedback: Tom Chester
Updated 25 September 2005.