Plant Guide for Waterline / Monument / Fault Road 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

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

Introduction

This is a 4.3 mile loop, with ~300 feet of elevation gain and loss, beginning and ending at the Visitor Center. The guide and loop traverses the entire length of the public portion of Waterline Road, and then returns via Monument Hill and Fault Roads. At the junction of the Vista Grande Trail and Waterline Road, one can return via Waterline Road, or via the Vista Grande Trail (see its separate plant guide).

The trailhead is the gate across Waterline Road immediately southeast of the Visitor Center.

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
153%
242%
353%
421%
532%
 ----
1-51911%
6-102816%
11-153017%
16-202816%
21-252112%
26-30158%
31-3584%
36-40116%
41-45116%
46-5021%
51-5574%
Total Taxa180100%

We found 3 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"
11/2/20021673761
12/22/20032774593
6/19/200438246103
12/26/20044134512283
7/1/2005517028152
7/5/2005617125152
9/8/2005717725112
11/15/2005818024102
3/23/2006918311101

In addition, one species was picked up on a quick walk of the first 0.83 miles on 10/15/05, and the identification of the Ribes was made on a special trip on 2/4/06.

Only the drainage at mile 0.54 was surveyed on 6/19/04; only the first 0.54 miles was covered on 7/5/05, primarily just to check a few species.

Prior to 12/26/2004, the route in this plant trail guide was different. At the junction of Waterline Road with Tenaja Road, the route turned right and surveyed Tenaja Road to its junction with the Lomas Trail. The number of taxa on 12/26/04 would have been 120 without the addition of the new route.

We thank Dick Newell for assistance with the 3/23/06 fieldwork.

The Plant Guide

Version for printing, without lines and other text on this page: html (9 pages), or pdf Clickbook booklet (2 double-sided pages) (See printing instructions for an explanation of these options)

The mileages have been rectified to ones measured from Topo!, using a GPS route to identify the portions not on the topo map. They should be accurate to 0.01-0.02 miles.

MileS#id?Common NameLatin Name#here#all
0.00   Beginning of Waterline Road next to Visitor Center at Gate; elevation ~1780 feet (542 m)
0.00l1 toyonHeteromeles arbutifolia+2 / 244
0.00r2 chamiseAdenostoma fasciculatum30 / 937
0.00r3 Torrey's scrub oakQuercus acutidens+30 / 926
0.00c4 *redstem filareeErodium cicutarium99 / 955
0.00b5 horseweedConyza canadensis50 / 936
0.00l6 *scarlet pimpernelAnagallis arvensis99 / 933
0.00b7 *tocaloteCentaurea melitensis99 / 945
0.00l8 *prickly sow thistleSonchus asper ssp. asper99 / 930
0.00l9 false monkeyflowerMimulus pilosus10 / 47
0.00l10 creeping spurgeChamaesyce serpens2 / 11
0.00b11 *narrowleaf filagoFilago gallica99 / 945
0.00r12 rattlesnake weedDaucus pusillus99 / 929
0.00b13 *Mediterranean schismusSchismus barbatus10 / 122
0.00r14 *hairy rattail fescueVulpia myuros var. hirsuta99 / 919
0.00r15 *red bromeBromus madritensis ssp. rubens99 / 953
0.00r16 saw-toothed goldenbushHazardia squarrosa var. grindelioides30 / 935
0.00b17 *soft chessBromus hordeaceus99 / 940
0.00r18 triangular-fruit sedgeCarex triquetra5 / 217
0.00r19 pygmy-weedCrassula connata10 / 228
0.00r20 checkerbloomSidalcea malviflora ssp. sparsifolia50 / 925
0.00b21 California buckwheatEriogonum fasciculatum var. foliolosum20 / 951
0.00r22 bristly bird's beakCordylanthus rigidus ssp. setigerus20 / 427
0.00l23 *rabbits-foot grassPolypogon monspeliensis50 / 924
0.00r24 San Diego tarweedHemizonia paniculata99 / 98
0.00b25 holly-leaf navarretiaNavarretia atractyloides50 / 99
0.00l  (blue-eyed grass, Sisyrinchium bellum; horehound, Marrubium vulgare; cocklebur, Xanthium strumarium; California everlasting, Gnaphalium californicum; common cudweed, Gnaphalium luteo-album; Spanish clover, Lotus purshianus var. purshianus)
0.00l  (a showy penstemon, Penstemon spectabilis var. spectabilis, planted in ~2002, was dead in 2005)
0.00b26?ash?Fraxinus sp.?+2 / 1 
0.00l27 coyote bushBaccharis pilularis+1 / 126
0.00l28 *London rocketSisymbrium irio+1 / 111
0.00b29 *shortpod mustardHirschfeldia incana99 / 951
0.00b30 canchalaguaCentaurium venustum99 / 915
0.00r31 hooked skunkweedNavarretia hamata ssp. hamata99 / 911
0.00r32 California-asterLessingia filaginifolia var. filaginifolia50 / 951
0.00r33 *nit grassGastridium ventricosum99 / 926
0.00r  (southern honeysuckle, Lonicera subspicata var. denudata; redberry, Rhamnus crocea; threadstem, Pterostegia drymarioides)
0.00r34 blue wildryeElymus glaucus ssp. glaucus20 / 521
0.00r  (seashore bentgrass, Agrostis pallens)
    (Emory's baccharis, Baccharis emoryi+)
0.00r35 climbing bedstrawGalium nuttallii ssp. nuttallii10 / 930
0.00r36 basketbushRhus trilobata3 / 324
0.00r37 coast live oakQuercus agrifolia var. agrifolia3 / 342
0.00l38 cockleburXanthium strumarium30 / 417
0.00l39 dove weedEremocarpus setigerus99 / 925
0.01l  (pineapple weed, Chamomilla suaveolens; rattlesnake weed, Chamaesyce albomarginata)
0.01r40 toad rushJuncus bufonius var. bufonius99 / 914
0.01r41 matchweedGutierrezia sarothrae+30 / 59
0.01r42 vinegar weedTrichostema lanceolatum99 / 915
0.01r43~*short-fruited filareeErodium brachycarpum99 / 914
0.01r44~rusty-haired popcorn flowerPlagiobothrys nothofulvus99 / 914
0.01r  (slender buckwheat, Eriogonum gracile var. gracile)
0.01l  A tree-like Torrey's scrub oak, Quercus acutidens, which has ~30 "trunks" and no Engelmann hairs on its leaves.
0.01l  (poison oak, Toxicodendron diversilobum)
0.01b  Look for first wild oats, Avena sp. on trail before mile 0.68
0.01r45 slender wreathplantStephanomeria exigua ssp. deanei1 / 114
0.01r  (leafy daisy, Erigeron foliosus var. foliosus)
0.02r  (coast-range melic, Melica imperfecta; golden yarrow, Eriophyllum confertiflorum var. confertiflorum)
0.02b  (southern honeysuckle, Lonicera subspicata var. denudata)
0.02l46 golden yarrowEriophyllum confertiflorum var. confertiflorum30 / 955
0.02l  (non-planted toyon, Heteromeles arbutifolia)
0.02r47 purple clarkiaClarkia purpurea ssp. quadrivulnera99 / 926
0.02r  (southern Indian pink, Silene laciniata ssp. major)
0.02r  (hollyleaf redberry, Rhamnus ilicifolia)
0.02r48 dwarf lupineLupinus bicolor99 / 929
0.03l49 *prickly lettuceLactuca serriola99 / 942
0.03l50 southern honeysuckleLonicera subspicata var. denudata10 / 940
0.03r51 narrowleaf bedstrawGalium angustifolium ssp. angustifolium10 / 349
0.03l52 *California burcloverMedicago polymorpha99 / 940
0.03r53 Pacific sanicleSanicula crassicaulis30 / 920
0.03r54 coast-range melicMelica imperfecta5 / 543
0.04r55 deerweedLotus scoparius var. scoparius10 / 229
0.04r56 leafy daisyErigeron foliosus var. foliosus4 / 444
0.04l57 splendid mariposa lilyCalochortus splendens / 20
0.04l58 Pomona locoweedAstragalus pomonensis20 / 911
0.04r59 San Diego birdsfoot lotusLotus hamatus / 24
0.04r  (tomcat clover, Trifolium willdenovii)
0.04l60 needlegrassNassella sp.99 / 9 
0.04r  (California lace fern, Aspidotis californica; goldback fern, Pentagramma triangularis ssp. triangularis)
0.05r61 common bedstrawGalium aparine99 / 938
0.05r62 *pineapple weedChamomilla suaveolens30 / 319
0.05r63 southern Indian pinkSilene laciniata ssp. major10 / 220
0.05r64~San Diego peaLathyrus vestitus var. alefeldii1 / 121
0.06r  Jct. use trail
0.06r  nodding needlegrassNassella cernua+ / 17
0.06l65 three spotOsmadenia tenella99 / 915
0.06l66 Spanish cloverLotus purshianus var. purshianus99 / 931
0.06l67 *grass polyLythrum hyssopifolia99 / 915
0.06l68 deergrassMuhlenbergia rigens3 / 221
0.07l  Jct. shortcut to Granite Loop Trail
0.07l69 common spikerushEleocharis macrostachya99 / 912
0.07b70 wrinkled rushJuncus rugulosus20 / 313
0.07r  (giant wild-rye, Leymus condensatus)
0.08r71 *hedge parsleyTorilis nodosa20 / 214
0.08r  (common chickweed, Stellaria media)
0.08r72 *bull thistleCirsium vulgare1 / 119
0.08r  Jct. animal path
0.08   (Field with three big patches of seasonal color: nearest (and in distance) is white / green of Spanish clover, Lotus purshianus var. purshianus; middle is red of wrinkled rush, Juncus rugulosus; farthest is white of three spot, Osmadenia tenella)
0.09r73 *yellow salsifyTragopogon dubius+40 / 513
0.10r74 clustered toad rushJuncus bufonius var. congestus50 / 39
0.10l75 *curly dockRumex crispus20 / 923
0.11r76 slender madiaMadia gracilis30 / 519
0.12r77 *sourcloverMelilotus indicus20 / 224
0.14b78 western ragweedAmbrosia psilostachya50 / 937
0.14l79 *sand spurreySpergularia bocconei99 / 914
0.15r80 San Diego wreathplantStephanomeria diegensis3 / 221
0.16l  (~30 unusual plants of purple clarkia, Clarkia purpurea ssp. quadrivulnera, with a densely-clustered inflorescence lacking petals)
0.18   From here to the creek crossing, graceful tarplant, Holocarpha virgata ssp. elongata, is mixed with San Diego tarweed, Hemizonia paniculata. After that, it is all San Diego tarweed again.
0.18b81 graceful tarplantHolocarpha virgata ssp. elongata99 / 915
0.18r82 creeping wild ryeLeymus triticoides5 / 112
0.18r83 Engelmann oakQuercus engelmannii5 / 523
0.19r84ssp*foxtail barleyHordeum murinum20 / 2 
0.19b  Jct. Granite Loop Trail.
0.19l85 *windmill pinkSilene gallica / 33
0.19r  Sign: "Mountain Lion..."
0.20b86 sharp-toothed sanicleSanicula arguta5 / 116
0.20r87 Mexican rushJuncus mexicanus20 / 316
0.20r  (Palmer's goldenbush, Ericameria palmeri var. pachylepis)
0.21r88 hybrid wild-ryeLeymus Xmultiflorus (L. condensatus X L. triticoides)50 / 96
0.21l89 *horehoundMarrubium vulgare3 / 132
0.21l90 arroyo willowSalix lasiolepis2 / 235
0.21l91 willow-leaved dockRumex salicifolius var. denticulatus10 / 29
0.22l  (blue elderberry, Sambucus mexicana, hidden behind arroyo willow)
0.22r92 goldenrodSolidago californica20 / 335
0.22r93 western vervainVerbena lasiostachys var. lasiostachys5 / 210
0.22r94 thyme-leafed spurgeChamaesyce serpyllifolia ssp. serpyllifolia2 / 22
0.22r95 narrow-leaf milkweedAsclepias fascicularis10 / 28
0.22r96 *Italian rye-grassLolium multiflorum99 / 918
0.22l97 mugwortArtemisia douglasiana5 / 128
0.22r98 *common cudweedGnaphalium luteo-album20 / 517
0.22r99 umbrella sedgeCyperus eragrostis5 / 211
0.22r100 floriferous monkeyflowerMimulus floribundus10 / 26
0.22   Cross drainage; elevation ~1755 feet (535 m )
0.22l  (mule fat, Baccharis salicifolia)
0.22l101 *common dandelionTaraxacum officinale+1 / 16
0.22b102 *ripgut bromeBromus diandrus99 / 952
0.22c103 *tumble pigweedAmaranthus albus5 / 214
0.22r104 cotton-batting plantGnaphalium stramineum5 / 120
0.22l  (long-stemmed buckwheat, Eriogonum elongatum var. elongatum)
0.23l  (bristly goldenaster, Heterotheca sessiliflora ssp. echioides)
0.23b105 telegraph weedHeterotheca grandiflora10 / 136
0.24l106 *knotweedPolygonum arenastrum99 / 920
0.25b107 saltgrassDistichlis spicata50 / 316
0.25r108 Palmer's goldenbushEricameria palmeri var. pachylepis5 / 210
0.26r109 Indian milkweedAsclepias eriocarpa10 / 418
0.27r110~*cut-leaved geraniumGeranium dissectum30 / 213
0.28b  Large field of hybrid wild-rye, Leymus Xmultiflorus (L. condensatus X L. triticoides)
0.28r  (branching phacelia, Phacelia ramosissima var. latifolia)
0.29r111 miner's lettuceClaytonia perfoliata ssp. perfoliata20 / 222
0.29r112 *common chickweedStellaria media20 / 225
0.29r113 hollyleaf redberryRhamnus ilicifolia3 / 343
0.30l114 *shepherd's purseCapsella bursa-pastoris30 / 310
0.30l115 chick lupineLupinus microcarpus var. microcarpus50 / 99
0.31r  (Check for western thistle, Cirsium occidentale)
0.31r116 California everlastingGnaphalium californicum5 / 343
0.33r117~baby Vasey's prickly-pearOpuntia vaseyi2 / 224
0.35l118~soap plantChlorogalum pomeridianum var. pomeridianum+2 / 219
0.35l119 *smooth cat's earHypochaeris glabra99 / 936
0.36r120 small-flowered fiddleneckAmsinckia menziesii var. menziesii20 / 210
0.36l121~Chinese housesCollinsia heterophylla20 / 112
0.37r122 *annual blue grassPoa annua10 / 115
0.38l123~*winter vetchVicia villosa ssp. varia / 19
0.38l  (fragrant everlasting, Gnaphalium canescens ssp. beneolens)
0.39l  (California peony, Paeonia californica)
0.39l  (closest branching phacelia, Phacelia ramosissima var. latifolia)
0.39l  (purple snapdragon, Antirrhinum nuttallianum ssp. nuttallianum)
0.40l  (giant wild-rye, Leymus condensatus)
0.44r  (big patch of giant wild-rye, Leymus condensatus)
0.44r  (blue elderberry, Sambucus mexicana)
0.45r  (sticky cinquefoil, Potentilla glandulosa ssp. glandulosa)
0.46l  Vent for water pipe
0.46l  Shrubs with beautiful oakmoss lichen, Evernia prunastri, on left.
0.48l124 giant wild-ryeLeymus condensatus2 / 227
0.49r125 purple needlegrassNassella pulchra99 / 920
0.50b126 *goldentopLamarckia aurea50 / 522
0.51r127 meadow-rueThalictrum fendleri var. polycarpum1 / 16
0.51r128 California fuchsiaEpilobium canum ssp. canum10 / 121
0.52l  (annual sunflower, Helianthus annuus)
0.52l129 seaside heliotropeHeliotropium curassavicum3 / 110
0.52l130 Hooker's evening-primroseOenothera elata ssp. hirsutissima2 / 110
0.53l131 *bermuda grassCynodon dactylon50 / 931
0.53l  Sign: "Sensitive Wetland Area; Do Not Enter"
0.53r132 *quackgrassElytrigia repens10 / 11
0.53r133 spike primroseEpilobium densiflorum10 / 15
0.53b134 mule fatBaccharis salicifolia5 / 239
0.53   Begin bridge across drainage; elevation ~1740 feet (530 m ); lowest elevation on route
0.53b135 clover fernMarsilea vestita ssp. vestita5 / 13
0.53b136 common monkeyflowerMimulus guttatus10 / 115
0.53r137 common tuleScirpus acutus var. occidentalis10 / 12
0.53l138 knot grassPaspalum distichum1 / 17
0.53r139 water cressRorippa nasturtium-aquaticum2 / 111
0.53l140 winged water-starwortCallitriche marginata10 / 15
0.53r141 sand spikerushEleocharis montevidensis10 / 17
0.53b142spcattailTypha sp.2 / 1 
0.53b  (red willow, Salix laevigata)
0.53b143 *whorled dockRumex conglomeratus5 / 111
0.53l144 needle spikerushEleocharis acicularis var. bella50 / 11
0.53l145 *dallis grassPaspalum dilatatum5 / 19
0.53r146 rigid hedge-nettleStachys ajugoides var. rigida5 / 112
0.53r147 brown-headed rushJuncus phaeocephalus var. phaeocephalus3 / 12
0.53r148 southern skullcapScutellaria bolanderi ssp. austromontana20 / 13
0.53r149 witchgrassPanicum capillare10 / 13
0.53r150 *common plantainPlantago major5 / 17
0.53r151 *spearmintMentha spicata var. spicata5 / 14
0.56l152 rattlesnake weedChamaesyce albomarginata20 / 910
0.58l153 *hedge mustardSisymbrium officinale5 / 121
0.59l  (johnny jump-up, Viola pedunculata)
0.60l154 *sow thistleSonchus oleraceus20 / 542
0.60l  Tree growing in 6" crack in large boulder. The crack was probably significantly widened by the tree's roots.
0.61l  (white-flowering currant, Ribes indecorum)
0.61l  Jct. use trail
0.66l155 blue dicksDichelostemma capitatum ssp. capitatum99 / 946
0.66   Begin having only graceful tarplant, Holocarpha virgata ssp. elongata, for the next ~0.5 miles.
0.68r156 johnny jump-upViola pedunculata20 / 516
0.68c157 *slender wild oatsAvena barbata99 / 940
0.69l  (Tree with ~8 big [crown galls??], looking like large cancer tumors)
0.71r  (Rainbow manzanita, Arctostaphylos rainbowensis)
0.73l  Fire hydrant
0.75l158 fragrant everlastingGnaphalium canescens ssp. beneolens3 / 323
0.75c159 *wild oatsAvena fatua99 / 926
0.80l160 poison oakToxicodendron diversilobum1 / 143
0.83l  Jct. beautiful old Coast Live Oak defaced in 2002 by large initials in bark. This may seriously hurt the tree by interrupting its vascular flow.
0.83l161 purple sanicleSanicula bipinnatifida99 / 911
0.83   Jct. Tenaja Truck Trail; elevation ~1780 feet (542 m); go left to continue on Waterline Road. Sign: "Waterline Road (back and to left); to Visitor Center 0.8 mi".
0.84r  Check for different annual lupine
0.87l  Cross head of small drainage
0.87b162 red maidsCalandrinia ciliata30 / 917
0.89l163 common hareleafLagophylla ramosissima ssp. ramosissima50 / 13
0.90r  (Excavated area - "borrow pit" for road construction?)
0.92l164 *Crete weedHedypnois cretica99 / 920
0.95b  Jct. Vista Grande Trail; elevation 1770 feet (539 m); cross drainage
0.95r165 *Mediterranean barleyHordeum marinum ssp. gussoneanum99 / 36
1.09   Local high point on road
1.11   Local low point on road; former Tenaja Truck Trail shown on USGS Map
1.19l166 long-stemmed buckwheatEriogonum elongatum var. elongatum / 29
1.24   Jct. Tenaja Road / Fault Road; elevation 1840 feet (561 m); go straight; sign: "Fault Road [left-right]; Monuement (sic) Hill Road [right] 0.7 mi"
1.24l167 coastal goldenbushIsocoma menziesii+2 / 117
    Check for muilla somewhere past here
1.28r  (Field of slender tarweed, Hemizonia fasciculata)
1.29l  (Field of chocolate lilies, Fritillaria biflora var. biflora)
1.34l168 slender tarweedHemizonia fasciculata99 / 918
1.34l  Check if this annual is not red maids
1.39l169 blue-eyed grassSisyrinchium bellum50 / 919
1.52   Local high point on road; elevation ~1875 feet (572 m)
1.53l  Jct. closed road to Tenaja Truck Trail
1.58l170 *little horseweedConyza bonariensis1 / 121
1.63l171 southern California morning-gloryCalystegia macrostegia ssp. arida+4 / 47
1.64l172~small-head field cloverTrifolium microcephalum10 / 110
1.65   Local low point on road; elevation 1860 feet (567 m); cross small drainage; now on Clay Hill
1.66r  (Field of shooting stars, Dodecatheon clevelandii ssp. clevelandii; please don't trample plants and go off-trail, there is a bigger and better patch on trail farther along)
1.74l173 tawny popcorn flowerPlagiobothrys fulvus5 / 14
1.74l174 California lotusLotus wrangelianus20 / 25
1.77r  Jct. Monument Hill Road; go right on it; elevation ~1870 feet (570 m)
1.77r  (California sagebrush, Artemisia californica, prior to 2005)
1.79r  (perc pit, from 1984 when land was slated for development)
 r175 small-flowered morning-gloryConvolvulus simulans5 / 12
1.88r176 shooting starDodecatheon clevelandii ssp. clevelandii30 / 211
1.88b  Beautiful field of hundreds of shooting stars, Dodecatheon clevelandii ssp. clevelandii, the best display of it at the SRPER.
1.90   Highest point on route; elevation 1890 feet (575 m)
1.91r177 shining peppergrassLepidium nitidum var. nitidum50 / 96
2.09r  soap plantChlorogalum pomeridianum var. pomeridianum+ /  
2.25r  (white everlasting, Gnaphalium canescens ssp. microcephalum)
2.28l178 *cheeseweedMalva parviflora10 / 117
2.28l  (Old metal structure, associated with cattle)
2.31c179 *little-seed canarygrassPhalaris minor10 / 11
2.33r  Jct. Fault Road; go right on it; local low point; elevation 1800 feet (549 m)
2.33l  Cattle water trough; this is perhaps the weediest area on the Reserve, where cattle were stationed year-round by the Kaiser Development Company from 1964 to 1984.
2.40r180 elk thistleCirsium scariosum4 / 311
2.41r  Cross small drainage; road curves left then right
2.49b  Many young glaucous shortpod mustard, Hirschfeldia incana, in road!
2.50b181 *Russian knapweedAcroptilon repens20 / 11
2.80   High point on road; elevation ~1850 feet (565 m)
2.86r ~(common lomatium, Lomatium utriculatum)
2.88r182 western buttercupRanunculus occidentalis10 / 16
2.88   Cross the famous swale, filled with red-skinned onion and Western buttercups in 2001
2.88b183 red-skinned onionAllium haematochiton5 / 13
2.98   Jct. Waterline Road; go left to return to Visitor Center; end plant guide
3.27   Jct. Vista Grande Trail; take it to the right to return via a different route.
4.08   End Vista Grande Trail; go left to Waterline Road
4.10   Jct. Waterline Road; go right to return to Visitor Center
4.29   End trip at Visitor Center.

Comments On Specific Species

Heteromeles arbutifolia, Baccharis pilularis, Baccharis emoryi, and Fraxinus sp.?. These specimens are planted.

Quercus acutidens. Most botanists would call the scrub oaks at the Santa Rosa Plateau Q. berberidifolia and hybrids with Q. engelmannii, without actually keying them out or studying them, since that is the conventional wisdom. However, that identification is unsatisfactory in a number of ways:

In contrast, these plants all fit perfectly with all the other Q. acutidens we've observed in Southern California. See Tom's unfinished article on Scrub Oaks for more information.

Gutierrezia sarothrae. The species G. sarothrae and G. californicum apparently intergrade extensively in Southern California; these plants are on the G. sarothrae side. See Plants of Southern California: Analysis Pages: Matchweed (Gutierrezia)

Nassella cernua . These species are not counted as new species unless the previous Nassella sp. turn out to be different taxa.

Sisymbrium irio, Tragopogon dubius, Taraxacum officinale. We are trying to eliminate this infestation here, so we hope you don't find any specimens of this species.

Chlorogalum pomeridianum var. pomeridianum . The first specimen on the trail, so far seen only with young leaves, is a bit unusual. It has wider leaves than normal for this species, and the margins are straight, not wavy. The second specimen was confirmed from blooms, and is also noted in the guide.

Isocoma menziesii. In our experience, the subspecies are not separable in Southern California. See Comments on the Jepson Manual and A Flora of Southern California by Munz: Isocoma menziesii.

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.


Tom thanks Jane Strong for her considerable assistance with helping him 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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Updated 4 April 2006.