Plant Guide to S. Lomas Trail / Monument Road to Trans Preserve Trail, Santa Rosa Plateau

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

This trail has not yet been studied in the Spring, and hence is especially incomplete, with many identifications made from dead annuals or new growth with only a few leaves.

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 guide covers:

To reach the trailhead, hike to the Adobes, then head north from the west end of the barn. In order to avoid the highly-disturbed area near the barn, this trail guide begins 0.15 mile north of Ranch Road, at the junction with the Adobe Loop 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 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 Ecological Reserve. A number of "1" means the taxon has only been found only on this list, among all the trails in my 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 Taxa67100%

I found no additional species not in the above table, since it has 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"

This route was first extended to include Monument Hill Road on 9/12/05, and hence two sets of numbers are given for that date. The first corresponds to the old route and just includes the S. Lomas Trail.

Kay Madore helped with the fieldwork on 9/12/05.

The Plant Guide

Version for printing, without lines and other text on this page: html (4 pages), pdf Clickbook booklet (1 double-sided page), or Large Type pdf Clickbook booklet (2 double-sided pages). (See printing instructions for an explanation of these options)

The mileages for the Lomas Trail portion are all within 0.03 miles of a GPS measurement of the trail, which is close enough that no adjustment has been made. Typical errors should be 0.01-0.03 miles. The GPS length of this portion of the trail was 0.47 miles.

The mileages for the Monument Hill Road portion have not yet been rectified.

MileS#id?Common NameLatin Name#here#all
0.00   Begin S. Lomas Trail at jct with north end of Adobe Loop Trail, heading north; elevation 1840 feet (560 m)
0.00r1 coast live oakQuercus agrifolia var. agrifolia3 / 242
0.00r  (Jepson's blue wildrye, Elymus glaucus ssp. jepsonii)
0.00b2 *wild oatsAvena fatua99 / 926
0.00b3 *Italian rye-grassLolium multiflorum10 / 118
0.00r4 *foxtail barleyHordeum murinum ssp. leporinum10 / 116
0.00b5 *ripgut bromeBromus diandrus99 / 952
0.00l6 *nit grassGastridium ventricosum99 / 926
0.00b7 *shortpod mustardHirschfeldia incana99 / 951
0.00b8 California everlastingGnaphalium californicum20 / 943
0.00r9 *prickly sow thistleSonchus asper ssp. asper5 / 530
0.00r10 *sow thistleSonchus oleraceus20 / 442
0.00b11 *smooth cat's earHypochaeris glabra99 / 935
0.00b12 *soft chessBromus hordeaceus99 / 940
0.00r13 *red bromeBromus madritensis ssp. rubens30 / 353
0.00b14 *prickly lettuceLactuca serriola10 / 342
0.00l15 purple needlegrassNassella pulchra99 / 920
0.00b16 *short-fruited filareeErodium brachycarpum99 / 914
0.00l17~*windmill pinkSilene gallica50 / 533
0.00r18 *bull thistleCirsium vulgare2 / 220
0.00l19 purple clarkiaClarkia purpurea ssp. quadrivulnera99 / 926
0.00b20 horseweedConyza canadensis10 / 437
0.00b21 Spanish cloverLotus purshianus var. purshianus99 / 931
0.00l22 vinegar weedTrichostema lanceolatum50 / 915
0.00l23 western ragweedAmbrosia psilostachya20 / 337
0.00   Sign: "Trail (ahead)"
0.00l  (blue elderberry, Sambucus mexicana)
0.00   Trail curves left
0.00r  (laurel sumac, Malosma laurina)
0.01r24 white everlastingGnaphalium canescens ssp. microcephalum20 / 336
0.01b25 *oliveOlea europaea1 / 110
0.01r26 Vasey's prickly-pearOpuntia vaseyi2 / 224
0.01l27 common bedstrawGalium aparine20 / 338
0.01l28 California poppyEschscholzia californica1 / 129
0.01b29 fragrant everlastingGnaphalium canescens ssp. beneolens10 / 323
0.01r30 hollyleaf redberryRhamnus ilicifolia1 / 143
0.01r31 toyonHeteromeles arbutifolia1 / 144
0.02   Trail jogs right and heads uphill over Bedford Canyon Formation.
0.03b32 California buckwheatEriogonum fasciculatum var. foliolosum5 / 151
0.03   Trail turns left 90°
0.03r33 graceful tarplantHolocarpha virgata ssp. elongata99 / 915
0.03b34 *narrowleaf filagoFilago gallica99 / 945
0.03r35 *scarlet pimpernelAnagallis arvensis20 / 333
0.04b36 *little horseweedConyza bonariensis1 / 116
0.05r37 *goldentopLamarckia aurea20 / 122
0.05r38 *tocaloteCentaurea melitensis20 / 245
0.05r39 dove weedEremocarpus setigerus99 / 925
0.05r40 California sagebrushArtemisia californica2 / 247
0.06b41 California-asterLessingia filaginifolia var. filaginifolia5 / 251
0.06b42 *California burcloverMedicago polymorpha99 / 940
0.06   (California bee plant, Scrophularia californica ssp. floribunda)
0.06r  Metal fence post.
0.06 43 *white-stemmed filareeErodium moschatum / 20
0.07b44 *long-beaked filareeErodium botrys99 / 912
0.07r  (bush monkeyflower, Mimulus aurantiacus)
0.07r45 long-stemmed buckwheatEriogonum elongatum var. elongatum4 / 228
0.07l  Jct. alt trail from Adobes; stay right.
0.08l46 western vervainVerbena lasiostachys var. lasiostachys1 / 110
0.08r  Metal fence post.
0.08r47 California brickellbushBrickellia californica1 / 128
0.08r48 bush monkeyflowerMimulus aurantiacus1 / 142
0.10b49 nodding needlegrassNassella cernua99 / 917
0.10r50 Indian milkweedAsclepias eriocarpa5 / 318
0.10r  (blue dicks, Dichelostemma capitatum ssp. capitatum)
0.12l  Metal fence post.
0.14r  (San Diego wreathplant, Stephanomeria diegensis; bicolored everlasting, Gnaphalium bicolor; Engelmann oak, Quercus engelmannii; poison oak, Toxicodendron diversilobum; coast-range melic, Melica imperfecta; California four o'clock, Mirabilis californica)
0.15r  Jct. use trail
0.16r  Check for sharp-toothed sanicle, Sanicula arguta
0.16r51 checkerbloomSidalcea malviflora ssp. sparsifolia20 / 925
0.16b52 johnny jump-upViola pedunculata10 / 916
0.16r53 blue dicksDichelostemma capitatum ssp. capitatum3 / 346
0.16l  Metal fence post.
0.18r  Sign: "Area Closed"
0.19r54 dwarf lupineLupinus bicolor5 / 130
0.21c55 *weak blue grassPoa infirma99 / 97
0.21l56 *curly dockRumex crispus1 / 123
0.21   Cross saddle between two hills
0.22b57 *rattail fescueVulpia myuros var. myuros99 / 220
0.23r  Rolled up barbed wire
0.25l  Metal fence post; view of 200 inch telescope dome on Palomar Mountain at 3 o'clock
0.28r  Metal fence post (gone in 2006)
0.31r58 southern California morning-gloryCalystegia macrostegia ssp. arida+1 / 111
0.31l  Metal fence post.
0.32   Local high point on trail
0.35   Minor local low point on trail
0.38   Local high point on trail
0.39   Minor local low point on trail
0.40r59 telegraph weedHeterotheca grandiflora2 / 237
0.44r60 laurel sumacMalosma laurina1 / 142
0.44   Jct. Monument Hill Road; elevation ~1955 feet (595 m); turn left on it
0.46l61 white-flowering currantRibes indecorum1 / 123
0.46l62 southern miner's lettuceClaytonia perfoliata ssp. mexicana10 / 229
0.46l63 Engelmann oakQuercus engelmannii1 / 123
0.49l64 blue-eyed grassSisyrinchium bellum1 / 120
0.51   Road curves left
0.56   Poppy Hill dead ahead; road curves right
0.63l65 *knotweedPolygonum arenastrum5 / 121
0.64b  Enter first fairly pristine area, dominated by native needlegrass, Nassella sp., not wild oats, Avena sp.
0.67c66 *Bermuda grassCynodon dactylon5 / 132
0.69   Jct. Ranch Road; jog left on it and take trail to Trans Preserve Trail
0.70r  Sign: "To Trans Preserve Trail 0.3 mi (ahead)"
0.73r67 elk thistleCirsium scariosum1 / 112
0.79   Jct. Trans Preserve Trail; end this guide

Comments On Specific Species

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 me 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 I found clear evidence that subspecies "intermedia" and "tenuifolia" are bogus. Hence I assign all the SRP plants to ssp. arida.

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Copyright © 2004-2006 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 23 April 2006.