Plant Guide to Adobe Loop Trail, Santa Rosa Plateau

Plant Guide to Adobe Loop Trail, Santa Rosa Plateau

This is a working list, about which I make no guarantees at all until I 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

The Adobe Loop Trail is, not surprisingly, a trail that loops around the Adobes. This guide describes a counter-clockwise traverse, beginning at the south entrance immediately south of the largest Adobe / Porta-Potty / parking lot. This trail is one of the shadiest trails at the Santa Rosa Plateau Ecological Reserve, traveling mostly through a coast live oak, Quercus agrifolia, forest. It travels briefly along Ranch Creek and then crosses the Creek shortly before its end at the Lomas Trail just north of the Adobes.
The easiest way to get to the south trailhead is to hike the 1.7 mile Vernal Pool Trail to its end at Ranch Road, turn right onto Ranch Road and walk for 0.16 miles to the trailhead.
The Adobe Loop Trail is 0.95 miles from one trailhead to the other, with ~100 feet of elevation gain and loss.
The Trail itself has been altered twice since this guide began; some of the off-trail species were originally on-trail.
By the way, the Adobes are not on the Adobe Loop Trail. They are the two buildings just north of the parking area. These buildings are apparently hard to recognize as adobes, since I have had people ask me where the Adobes are when they are looking right at them! I have also encountered people who have left the Adobes and taken the Adobe Loop Trail in order to look for the Adobes, and asked me on the trail where the Adobes are.
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
1 1 1%
2 4 2%
3 4 2%
4 5 3%
5 0 0%

1-5 14 8%
6-10 16 10%
11-15 33 20%
16-20 27 16%
21-25 18 11%
26-30 15 9%
31-35 8 5%
36-40 11 7%
41-45 14 8%
46-50 4 2%
51-55 7 4%
All 167 100%

I found no additional species not in the above table, since it has not been fully identified yet. The unidentified ones are marked with ? or sp in the id? column in the guide, and have no entries in the #all column.
(Not updated yet from latest fieldwork.) The taxa found only on this trail, or on only a few trails, or only mostly on trails at the Santa Rosa Plateau, as of 4/7/05, are:

#all Common Name Latin Name
1 hybrid oak Quercus agrifolia var. agrifolia X Quercus wislizeni var. frutescens
1 *tiny bedstraw Galium murale
2 *tall fescue Festuca arundinacea
2 California lotus Lotus wrangelianus
2 Gambel's dwarf milk-vetch Astragalus gambelianus
2 southern foothill penstemon Penstemon heterophyllus var. australis
2 western lady's mantle Aphanes occidentalis
2 long-leaf plantain Plantago elongata
3 *weak blue grass Poa infirma
3 *Himalaya blackberry Rubus discolor
7 rusty-haired popcorn flower Plagiobothrys nothofulvus
8 western buttercup Ranunculus occidentalis

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 Date Visit # # taxa # "?" # "sp" # "~" # "ssp"
4/17/2002 1 103 2 16 5 2
5/5/2002 2 108 2 11 4 1
6/7/2002 3 111 2 11 4 1
6/25/2002 4 112 2 11 4 1
7/31/2002 4 112 2 10 4 1
6/19/2004 6 119 1 12 7 2
11/6/2004 7 123 1 12 9 3
12/13/2004 8 129 2 11 12 3
2/2/2005 9 131 2 11 12 3
3/10/2005 10
4/7/2005 11 146 2 7 8 2
6/19/2005 13 152 1 3 6 0
7/9/2005 14 159 0 1 6 0
8/18/2005 15 159 0 1 5 0
9/12/2005 16 163 0 1 4 0
11/19/2005 17 163 0 1 4 0
2/23/2006 18 164 0 1 3 0
4/21/2006 19 167 0 0 2 0

Kay Madore assisted with most of the fieldwork beginning on 6/19/04; we surveyed only the first 0.41 miles on the 11/6/04, 12/13/04, 2/2/05, 3/10/05. 6/19/05 and 11/19/05 trips, and I surveyed only the first 0.41 miles on 4/7/05 and 8/18/05. The 2/2/05 and 8/18/05 fieldwork was minimal, since that trip was mostly hiking.
In addition, Kay found the Clarkia epilobioides on a separate trip in 2003, and a few taxa were noted on a trip with the Riverside CNPS chapter on 4/17/05, including Spergularia bocconei found by members of that chapter.
Dick Newell and Jim Adams assisted with the fieldwork on 4/21/06.
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 (4 double-sided pages). (See printing instructions for an explanation of these options)

Mile s # id? Common Name Latin Name #here #all
0.00 Begin the loop at the south entrance, immediately south of the largest Adobe / Porta-Potty / parking lot. Sign: "Adobe Loop Trail / Punta Mesa Trail; to Monument Hill Road 2.4 mi; to Adobe Loop Jct. 0.4 mi"; elevation 1840 feet (561 m)
0.00 b 1 *California burclover Medicago polymorpha 99 / 9 40
0.00 b 2 *short-fruited filaree Erodium brachycarpum 20 / 9 14
0.00 l (bull thistle, Cirsium vulgare)
0.00 b 3 *shortpod mustard Hirschfeldia incana 99 / 9 51
0.00 b 4 *redstem filaree Erodium cicutarium 99 / 9 55
0.00 b 5 *soft chess Bromus hordeaceus 99 / 9 40
0.00 r 6 *hairy rattail fescue Vulpia myuros var. hirsuta 99 / 9 19
0.00 b 7 *Italian rye-grass Lolium multiflorum 99 / 9 18
0.00 b 8 *wild oats Avena fatua 99 / 9 26
0.00 r 9 *white-stemmed filaree Erodium moschatum 30 / 2 20
0.00 b 10 *foxtail barley Hordeum murinum ssp. glaucum 30 / 3 13
0.00 c 11 *narrowleaf filago Filago gallica 99 / 9 45
0.00 b 12 *ripgut brome Bromus diandrus 99 / 9 52
0.00 l 13 *prickly sow thistle Sonchus asper ssp. asper 20 / 7 30
0.00 r 14 purple needlegrass Nassella pulchra 50 / 9 20
0.00 15 California everlasting Gnaphalium californicum 20 / 9 43
0.00 r 16 horseweed Conyza canadensis 5 / 3 37
0.00 l 17 *horehound Marrubium vulgare 50 / 9 32
0.00 r 18 coast live oak Quercus agrifolia var. agrifolia 20 / 9 42
0.00 r 19 *tall fescue Festuca arundinacea 1 / 1 3
0.00 b 20 *prickly lettuce Lactuca serriola 99 / 9 42
0.00 Cross through opening in fence missing its gate.
0.00 c 21 *shepherd's purse Capsella bursa-pastoris 30 / 2 10
0.00 r 22 *cheeseweed Malva parviflora 20 / 2 17
0.01 r 23 *sow thistle Sonchus oleraceus 10 / 5 42
0.02 c 24 *knotweed Polygonum arenastrum 20 / 5 20
0.02 r (stinking gourd, Cucurbita foetidissima)
0.02 b 25 *curly dock Rumex crispus 20 / 9 23
0.03 r (common fiddleneck, Amsinckia menziesii var. intermedia)
0.03 c 26 red maids Calandrinia ciliata / 17
0.03 Cross through open gate in fence
0.04 r 27 graceful tarplant Holocarpha virgata ssp. elongata 50 / 9 15
0.05 l 28 hollyleaf redberry Rhamnus ilicifolia 5 / 3 43
0.05 r 29 blue-eyed grass Sisyrinchium bellum 20 / 9 19
0.05 l Beware the bee's nest at the base of the hollyleaf redberry in 2002 and 2003!
0.05 l New shed in 2004
0.06 l (California buckwheat, Eriogonum fasciculatum var. foliolosum)
0.06 l 30 *windmill pink Silene gallica / 33
0.07 l 31 purple sanicle Sanicula bipinnatifida 50 / 9 11
0.07 l 32 blue dicks Dichelostemma capitatum ssp. capitatum 50 / 9 46
0.07 l 33 checkerbloom Sidalcea malviflora ssp. sparsifolia 50 / 9 25
0.07 l The Earl W. Lathrop Bench.
0.09 l 34 *slender wild oats Avena barbata 10 / 1 40
0.11 Cross drainage
0.12 r 35 purple clarkia Clarkia purpurea ssp. quadrivulnera 99 / 9 26
0.13 r 36 southern miner's lettuce Claytonia perfoliata ssp. mexicana 40 / 9 25
0.13 r 37 western buttercup Ranunculus occidentalis 99 / 9 6
0.14 r 38 dwarf lupine Lupinus bicolor 50 / 9 29
0.14 c 39 shining peppergrass Lepidium nitidum var. nitidum / 6
0.14 b 40 California-aster Lessingia filaginifolia var. filaginifolia 30 / 9 51
0.14 b 41 *smooth cat's ear Hypochaeris glabra 99 / 9 35
0.14 b Fenceposts
0.14 l 42 Engelmann oak Quercus engelmannii 1 / 1 23
0.15 l 43 climbing bedstraw Galium nuttallii ssp. nuttallii 10 / 9 30
0.15 b 44 *hedge parsley Torilis nodosa 99 / 9 14
0.15 r 45 slender madia Madia gracilis 50 / 9 19
0.15 r 46 sticky cinquefoil Potentilla glandulosa ssp. glandulosa 10 / 2 17
0.15 r 47 southern honeysuckle Lonicera subspicata var. denudata 20 / 9 40
0.15 r 48 coast-range melic Melica imperfecta 50 / 9 43
0.15 b 49 toyon Heteromeles arbutifolia 3 / 3 44
0.15 r 50 common bedstraw Galium aparine 99 / 9 38
0.15 b 51 poison oak Toxicodendron diversilobum 99 / 9 43
0.15 r 52 laurel sumac Malosma laurina 10 / 3 42
0.15 b 53 California brome Bromus carinatus var. carinatus 5 / 2 24
0.15 r (heartleaf penstemon, Keckiella cordifolia)
0.15 Cross wooded drainage
0.15 b 54 California sweet-cicely Osmorhiza brachypoda 50 / 9 6
0.15 r 55 blue wildrye Elymus glaucus ssp. glaucus 40 / 9 21
0.15 r 56 *cut-leaved geranium Geranium dissectum 50 / 4 13
0.15 r 57 *weak blue grass Poa infirma 30 / 2 6
0.16 r 58 *common groundsel Senecio vulgaris 2 / 1 18
0.16 r Either an unusual coast live oak, or possibly a hybrid with interior live oak, Quercus agrifolia var. agrifolia X Quercus wislizeni var. frutescens⁺
0.16 l 59 leafy daisy Erigeron foliosus var. foliosus 4 / 3 44
0.16 l 60 fragrant everlasting Gnaphalium canescens ssp. beneolens 2 / 2 23
0.16 r 61 blue larkspur Delphinium parryi ssp. parryi 20 / 2 14
0.17 l A white-flowered "blue-eyed grass", Sisyrinchium bellum
0.17 b 62 dove weed Eremocarpus setigerus 10 / 2 25
0.17 r 63 shooting star Dodecatheon clevelandii ssp. clevelandii 50 / 5 11
0.17 r Beautiful field of shooting stars.
0.17 l (American vetch, Vicia americana var. americana; white-flowering currant, Ribes indecorum)
0.17 b 64 slender cottonweed Micropus californicus var. californicus 99 / 5 7
0.17 r 65 California lotus Lotus wrangelianus 99 / 5 4
0.17 l 66 Gambel's dwarf milk-vetch Astragalus gambelianus 40 / 2 4
0.17 l 67 vinegar weed Trichostema lanceolatum 10 / 2 15
0.17 b 68 *nit grass Gastridium ventricosum 99 / 9 26
0.17 b 69 *red brome Bromus madritensis ssp. rubens / 53
0.17 l 70 *goldentop Lamarckia aurea 10 / 1 24
0.18 l (San Diego wreathplant, Stephanomeria diegensis)
0.19 r 71 johnny jump-up Viola pedunculata 20 / 4 16
0.19 l 72 California buckwheat Eriogonum fasciculatum var. foliolosum 3 / 2 51
0.19 r 73 California plantain Plantago erecta 99 / 9 13
0.19 r 74 earth brodiaea Brodiaea terrestris ssp. kernensis 10 / 1 7
0.19 r Nice field of needlegrass.
0.21 b 75 *mouse-ear chickweed Cerastium glomeratum 50 / 9 19
0.21 r (Italian thistle, Carduus pycnocephalus)
0.21 r (soap plant, Chlorogalum pomeridianum var. pomeridianum)
0.21 r 76 three spot Osmadenia tenella 30 / 1 15
0.22 r 77 *sand spurrey Spergularia bocconei 20 / 2 14
0.23 r 78 coast jepsonia Jepsonia parryi 30 / 2 15
0.23 r 79 *barbgrass Hainardia cylindrica 40 / 2 1
0.24 l 80 deerweed Lotus scoparius var. scoparius 40 / 5 29
0.24 b 81 Torrey's scrub oak Quercus acutidens 50 / 9 26
0.24 r 82 wild-cucumber Marah macrocarpus var. macrocarpus 4 / 4 44
0.24 r 83 heartleaf penstemon Keckiella cordifolia 10 / 3 28
0.24 r 84 splendid mariposa lily Calochortus splendens 10 / 9 20
0.24 r 85 soap plant Chlorogalum pomeridianum var. pomeridianum 50 / 9 19
0.24 r 86 white-flowering currant Ribes indecorum 1 / 1 22
0.24 r 87 Pacific sanicle Sanicula crassicaulis 30 / 9 20
0.24 r 88 holly-leaf navarretia Navarretia atractyloides 50 / 9 9
0.24 r 89 *tiny bedstraw Galium murale 99 / 9 2
0.24 r 90 California sagebrush Artemisia californica 50 / 9 47
0.25 b 91 bristly bird's beak Cordylanthus rigidus ssp. setigerus 50 / 9 28
0.25 r (coyote bush, Baccharis pilularis)
0.25 r 92 chamise Adenostoma fasciculatum 20 / 9 37
0.25 r 93 golden yarrow Eriophyllum confertiflorum var. confertiflorum 20 / 9 55
0.25 r 94 saw-toothed goldenbush Hazardia squarrosa var. grindelioides 3 / 2 35
0.25 r 95 Parish's purple nightshade Solanum parishii 20 / 4 20
0.25 b 96 San Diego pea Lathyrus vestitus var. alefeldii 4 / 3 21
0.25 r (meadow-rue, Thalictrum fendleri var. polycarpum)
0.26 r 97 purple head Acourtia microcephala 1 / 1 19
0.26 l 98 black sage Salvia mellifera 10 / 5 40
0.26 r 99 slender vetch Vicia hassei 10 / 2 6
0.26 r 100 narrowleaf bedstraw Galium angustifolium ssp. angustifolium 2 / 2 50
0.26 r 101 southern foothill penstemon Penstemon heterophyllus var. australis 20 / 2 2
0.26 r 102 white sage Salvia apiana 10 / 5 38
0.27 (goldback fern, Pentagramma triangularis ssp. triangularis)
0.27 r 103 pygmy-weed Crassula connata 99 / 9 28
0.27 r 104 goldfields Lasthenia californica 2 / 1 12
0.27 r 105 toad rush Juncus bufonius var. bufonius / 14
0.28 r Corestone eroding out of the Woodson Mountain granodiorite
0.30 r 106 western lady's mantle Aphanes occidentalis 30 / 2 3
0.32 b 107 San Diego birdsfoot lotus Lotus hamatus 30 / 2 24
0.32 r 108 goldenstar Bloomeria crocea 2 / 2 12
0.34 l 109 *tocalote Centaurea melitensis 20 / 9 45
0.34 c 110 *pineapple weed Chamomilla suaveolens 1 / 1 19
0.34 r 111 slender wreathplant Stephanomeria exigua ssp. deanei 2 / 2 14
0.34 r 112 San Diego mountain mahogany Cercocarpus minutiflorus 4 / 2 12
0.35 r 113 *common chickweed (no petals in first location!) Stellaria media⁺ 30 / 2 25
0.35 l 114 *olive Olea europaea 4 / 4 10
0.35 r 115 Eastwood manzanita Arctostaphylos glandulosa ssp. zacaensis 2 / 1 11
0.37 b 116 bush monkeyflower Mimulus aurantiacus 10 / 7 42
0.39 l 117 *scarlet pimpernel Anagallis arvensis 50 / 9 33
0.39 r 118 long-leaf plantain Plantago elongata 99 / 2 2
0.40 r 119 eucrypta Eucrypta chrysanthemifolia var. chrysanthemifolia 20 / 3 25
0.41 b 120 rusty-haired popcorn flower Plagiobothrys nothofulvus 40 / 3 13
0.42 l 121 *hedge mustard Sisymbrium officinale 50 / 4 20
0.42 r (Woodrat's nest in tree)
0.43 b 122 Pomona locoweed Astragalus pomonensis 2 / 1 11
0.43 l 123 canchalagua Centaurium venustum 3 / 1 15
0.43 r 124 ~ canyon clarkia Clarkia epilobioides 10 / 1 11
0.43 b 125 rattlesnake weed Daucus pusillus 40 / 9 29
0.43 l (white everlasting, Gnaphalium canescens ssp. microcephalum)
0.43 l 126 short-winged deerweed Lotus scoparius var. brevialatus 2 / 1 23
0.44 Jct. with Punta Mesa Trail; go left; elevation 1800 feet (549 m); sign: "Adobe Loop / Punta Mesa Trail"; trail now descends
0.44 r 127 strigose lotus Lotus strigosus 2 / 1 35
0.44 r 128 southern Indian pink Silene laciniata ssp. major / 20
0.45 l 129 Spanish clover Lotus purshianus var. purshianus / 31
0.45 l 130 Chinese houses Collinsia heterophylla⁺ 50 / 2 14
0.45 r 131 giant wild-rye Leymus condensatus 2 / 2 27
0.45 b common chickweed, Stellaria media, with petals
0.47 l 132 basketbush Rhus trilobata 1 / 1 24
0.52 r (Beehive in tree)
0.52 r 133 telegraph weed Heterotheca grandiflora / 37
0.53 l 134 tree clover Trifolium ciliolatum 10 / 1 12
0.54 l 135 ~ *yellow salsify Tragopogon dubius⁺ 1 / 1 13
0.54 r 136 western sycamore Platanus racemosa 1 / 1 27
0.54 b 137 *bull thistle Cirsium vulgare 30 / 9 19
0.55 Trail turns left 90°
0.55 r 138 western ragweed Ambrosia psilostachya 50 / 9 37
0.56 l 139 *sourclover Melilotus indicus 5 / 1 24
0.56 l Field of autumn willowweed, Epilobium brachycarpum
0.56 l 140 autumn willowweed Epilobium brachycarpum 10 / 1 4
0.56 r 141 arroyo willow Salix lasiolepis 2 / 2 35
0.57 b 142 *Himalaya blackberry Rubus discolor 10 / 3 3
0.58 Cross drainage; elevation 1760 feet (536 m); trail curves left
0.58 l 143 rigid hedge-nettle Stachys ajugoides var. rigida 5 / 2 13
0.59 b 144 California poppy Eschscholzia californica 10 / 2 29
0.60 r 145 creeping wild rye Leymus triticoides 20 / 2 12
0.60 r Field of slender madia, Madia gracilis
0.60 l 146 *field hedge-parsley Torilis arvensis 50 / 1 6
0.60 r (shining willow, Salix lucida ssp. lasiandra)
0.60 r 147 saltgrass Distichlis spicata 20 / 2 17
0.60 Cross very small drainage
0.61 c 148 Mexican rush Juncus mexicanus 10 / 3 16
0.62 r Cross just above head of drainage
0.62 149 *fennel Foeniculum vulgare⁺ 1 / 1 13
0.66 l 150 blue elderberry Sambucus mexicana 2 / 2 48
0.66 r (hybrid wild-rye, Leymus Xmultiflorus = L. condensatus X L. triticoides)
0.67 r (red willow, Salix laevigata⁺)
0.69 r (In drainage: Pacific rush, Juncus effusus var. pacificus; wrinkled rush, Juncus rugulosus; sand spikerush, Eleocharis montevidensis; cocklebur, Xanthium strumarium; spike primrose, Epilobium densiflorum; narrow-leaf milkweed, Asclepias fascicularis; Emory's baccharis, Baccharis emoryi; mule fat, Baccharis salicifolia; water cress, Rorippa nasturtium-aquaticum)
0.69 r (deergrass, Muhlenbergia rigens)
0.70 l Sign: "Trail Closed" (for path leading to Reserve Resource Manager's House)
0.72 r (pecan, Carya illinoensis)
0.72 r 151 *dallis grass Paspalum dilatatum 1 / 1 10
0.73 l 152 Indian milkweed Asclepias eriocarpa 10 / 2 18
0.73 r (bristly ox-tongue, Picris echioides)
0.73 Enter riparian woodland.
0.76 r Sign: "When Rock and Water Meet" (tenaja); go to the tenaja for the next two species
0.76 r 153 panicled bulrush Scirpus microcarpus 30 / 2 2
0.76 r 154 *grass poly Lythrum hyssopifolia 5 / 1 15
0.79 l Red bench
0.81 l Virginia C. House Bench
0.82 Begin bridge over Ranch Creek
0.82 l 155 narrow-leaf milkweed Asclepias fascicularis 5 / 1 8
0.82 l 156 sand spikerush Eleocharis montevidensis 10 / 1 7
0.82 l 157 Pacific rush Juncus effusus var. pacificus 1 / 1 4
0.82 l 158 *English plantain Plantago lanceolata 1 / 1 19
0.82 b 159 *spearmint Mentha spicata var. spicata 10 / 1 4
0.82 l 160 water cress Rorippa nasturtium-aquaticum 2 / 1 11
0.82 l 161 Hooker's evening-primrose Oenothera elata ssp. hirsutissima⁺ 2 / 1 10
0.82 l (giant chain fern, Woodwardia fimbriata)
0.82 l 162 scarlet monkeyflower Mimulus cardinalis 2 / 1 15
0.82 End bridge
0.82 r 163 clustered field sedge Carex praegracilis 3 / 2 9
0.83 Trail turns left 90°
0.83 l 164 *little horseweed Conyza bonariensis 1 / 1 16
0.85 l (greater periwinkle, Vinca major, on far bank)
0.87 l 165 Vasey's prickly-pear Opuntia vaseyi 1 / 1 24
0.89 l Sign: "Sensitive wetland area. Do not enter".
0.89 Trail jogs right. Note granary branch on ground; it was hanging just above your head over the trail until 2006
0.90 l 166 *orchard-grass Dactylis glomerata 20 / 2 3
0.90 l 167 *whorled dock Rumex conglomeratus 1 / 1 11
0.95 End Adobe Loop Trail at jct. with Lomas Trail; elevation 1840 feet (561 m)

Comments On Specific Species

{Quercus agrifolia var. agrifolia X Quercus wislizeni var. frutescens}??. This tree has the typical shape of an old Quercus agrifolia, but the leaves are significantly different from those of Q. agrifolia. The leaves are dead flat and tapered to the tip, unlike the typical Q. agrifolia leaves that are curled downward around the edges and with rounded tips. Some of the leaves are totally glabrous below, and some have typical Q. agrifolia hairs in the axils of the veins on the underneath of the leaves. Acorns have not yet been checked, since they weren't present on the tree in 2004.
Stellaria media. The first group of plants on the trail are clearly S. media, not the petal-less S. pallida, since the plants are annual, have internodes of the stem with a line of wavy hairs, and have sepals 3.5 mm in flower; 4.0 mm in fruit; and seeds 0.9-1.0 mm. However, the flowers are cleistogamous and have no petals!
The second group of plants on the trail, just 0.10 mile farther, are normal Stellaria media with petals, and are otherwise identical to the first group.
Collinsia heterophylla. The last three flowers, sampled on 7/9/05, keyed out as perfect C. concolor. However, all samples examined on 4/21/05 were perfect C. heterophylla. I have found before that the last flowers in the season are sometimes not representative.
Foeniculum vulgare and Tragopogon dubius. These species are weeded out or sprayed whenever they appear, so I hope you do not see them.
Salix laevigata. This specimen has some of the characteristics of Salix lasiolepis, so either this is a hybrid with that species, or else the characteristics of Salix laevigata go beyond the range in the floras. This specimen has the pointed bud scale of Salix laevigata. However, the first leaves are the elliptic leaves of Salix lasiolepis, symmetric around the middle of the leaf, and the younger leaves are the acuminate leaves of Salix laevigata. The flowers of this male plant have 2-5 stamens, not the 2 of Salix lasiolepis and not the 5 of Salix laevigata.
Histogram of the number of stamens for several catkins:

Number of Stamens Number of Flowers
With That Number of Stamens
2 5
3 11
4 3
5 1

Oenothera elata ssp. hirsutissima. The Oenothera was gone in 2005, but probably will reappear in a future year. Riparian plants that grow in drainages move around quite a lot.
I thank Jane Strong for her considerable assistance with helping me to learn the plants of the Santa Rosa Plateau.

Number of Trails Containing A Taxon	Number Of Taxa On This Trail	% of Taxa On This Trail
1	1	1%
2	4	2%
3	4	2%
4	5	3%
5	0	0%

1-5	14	8%
6-10	16	10%
11-15	33	20%
16-20	27	16%
21-25	18	11%
26-30	15	9%
31-35	8	5%
36-40	11	7%
41-45	14	8%
46-50	4	2%
51-55	7	4%
All	167	100%

#all	Common Name	Latin Name
1	hybrid oak	Quercus agrifolia var. agrifolia X Quercus wislizeni var. frutescens
1	*tiny bedstraw	Galium murale
2	*tall fescue	Festuca arundinacea
2	California lotus	Lotus wrangelianus
2	Gambel's dwarf milk-vetch	Astragalus gambelianus
2	southern foothill penstemon	Penstemon heterophyllus var. australis
2	western lady's mantle	Aphanes occidentalis
2	long-leaf plantain	Plantago elongata
3	*weak blue grass	Poa infirma
3	*Himalaya blackberry	Rubus discolor
7	rusty-haired popcorn flower	Plagiobothrys nothofulvus
8	western buttercup	Ranunculus occidentalis

Visit Date	Visit #	# taxa	# "?"	# "sp"	# "~"	# "ssp"
4/17/2002	1	103	2	16	5	2
5/5/2002	2	108	2	11	4	1
6/7/2002	3	111	2	11	4	1
6/25/2002	4	112	2	11	4	1
7/31/2002	4	112	2	10	4	1
6/19/2004	6	119	1	12	7	2
11/6/2004	7	123	1	12	9	3
12/13/2004	8	129	2	11	12	3
2/2/2005	9	131	2	11	12	3
3/10/2005	10
4/7/2005	11	146	2	7	8	2
6/19/2005	13	152	1	3	6	0
7/9/2005	14	159	0	1	6	0
8/18/2005	15	159	0	1	5	0
9/12/2005	16	163	0	1	4	0
11/19/2005	17	163	0	1	4	0
2/23/2006	18	164	0	1	3	0
4/21/2006	19	167	0	0	2	0

Mile	s	#	id?	Common Name	Latin Name	#here	#all
0.00				Begin the loop at the south entrance, immediately south of the largest Adobe / Porta-Potty / parking lot. Sign: "Adobe Loop Trail / Punta Mesa Trail; to Monument Hill Road 2.4 mi; to Adobe Loop Jct. 0.4 mi"; elevation 1840 feet (561 m)
0.00	b	1		*California burclover	Medicago polymorpha	99 / 9	40
0.00	b	2		*short-fruited filaree	Erodium brachycarpum	20 / 9	14
0.00	l			(bull thistle, Cirsium vulgare)
0.00	b	3		*shortpod mustard	Hirschfeldia incana	99 / 9	51
0.00	b	4		*redstem filaree	Erodium cicutarium	99 / 9	55
0.00	b	5		*soft chess	Bromus hordeaceus	99 / 9	40
0.00	r	6		*hairy rattail fescue	Vulpia myuros var. hirsuta	99 / 9	19
0.00	b	7		*Italian rye-grass	Lolium multiflorum	99 / 9	18
0.00	b	8		*wild oats	Avena fatua	99 / 9	26
0.00	r	9		*white-stemmed filaree	Erodium moschatum	30 / 2	20
0.00	b	10		*foxtail barley	Hordeum murinum ssp. glaucum	30 / 3	13
0.00	c	11		*narrowleaf filago	Filago gallica	99 / 9	45
0.00	b	12		*ripgut brome	Bromus diandrus	99 / 9	52
0.00	l	13		*prickly sow thistle	Sonchus asper ssp. asper	20 / 7	30
0.00	r	14		purple needlegrass	Nassella pulchra	50 / 9	20
0.00		15		California everlasting	Gnaphalium californicum	20 / 9	43
0.00	r	16		horseweed	Conyza canadensis	5 / 3	37
0.00	l	17		*horehound	Marrubium vulgare	50 / 9	32
0.00	r	18		coast live oak	Quercus agrifolia var. agrifolia	20 / 9	42
0.00	r	19		*tall fescue	Festuca arundinacea	1 / 1	3
0.00	b	20		*prickly lettuce	Lactuca serriola	99 / 9	42
0.00				Cross through opening in fence missing its gate.
0.00	c	21		*shepherd's purse	Capsella bursa-pastoris	30 / 2	10
0.00	r	22		*cheeseweed	Malva parviflora	20 / 2	17
0.01	r	23		*sow thistle	Sonchus oleraceus	10 / 5	42
0.02	c	24		*knotweed	Polygonum arenastrum	20 / 5	20
0.02	r			(stinking gourd, Cucurbita foetidissima)
0.02	b	25		*curly dock	Rumex crispus	20 / 9	23
0.03	r			(common fiddleneck, Amsinckia menziesii var. intermedia)
0.03	c	26		red maids	Calandrinia ciliata	/	17
0.03				Cross through open gate in fence
0.04	r	27		graceful tarplant	Holocarpha virgata ssp. elongata	50 / 9	15
0.05	l	28		hollyleaf redberry	Rhamnus ilicifolia	5 / 3	43
0.05	r	29		blue-eyed grass	Sisyrinchium bellum	20 / 9	19
0.05	l			Beware the bee's nest at the base of the hollyleaf redberry in 2002 and 2003!
0.05	l			New shed in 2004
0.06	l			(California buckwheat, Eriogonum fasciculatum var. foliolosum)
0.06	l	30		*windmill pink	Silene gallica	/	33
0.07	l	31		purple sanicle	Sanicula bipinnatifida	50 / 9	11
0.07	l	32		blue dicks	Dichelostemma capitatum ssp. capitatum	50 / 9	46
0.07	l	33		checkerbloom	Sidalcea malviflora ssp. sparsifolia	50 / 9	25
0.07	l			The Earl W. Lathrop Bench.
0.09	l	34		*slender wild oats	Avena barbata	10 / 1	40
0.11				Cross drainage
0.12	r	35		purple clarkia	Clarkia purpurea ssp. quadrivulnera	99 / 9	26
0.13	r	36		southern miner's lettuce	Claytonia perfoliata ssp. mexicana	40 / 9	25
0.13	r	37		western buttercup	Ranunculus occidentalis	99 / 9	6
0.14	r	38		dwarf lupine	Lupinus bicolor	50 / 9	29
0.14	c	39		shining peppergrass	Lepidium nitidum var. nitidum	/	6
0.14	b	40		California-aster	Lessingia filaginifolia var. filaginifolia	30 / 9	51
0.14	b	41		*smooth cat's ear	Hypochaeris glabra	99 / 9	35
0.14	b			Fenceposts
0.14	l	42		Engelmann oak	Quercus engelmannii	1 / 1	23
0.15	l	43		climbing bedstraw	Galium nuttallii ssp. nuttallii	10 / 9	30
0.15	b	44		*hedge parsley	Torilis nodosa	99 / 9	14
0.15	r	45		slender madia	Madia gracilis	50 / 9	19
0.15	r	46		sticky cinquefoil	Potentilla glandulosa ssp. glandulosa	10 / 2	17
0.15	r	47		southern honeysuckle	Lonicera subspicata var. denudata	20 / 9	40
0.15	r	48		coast-range melic	Melica imperfecta	50 / 9	43
0.15	b	49		toyon	Heteromeles arbutifolia	3 / 3	44
0.15	r	50		common bedstraw	Galium aparine	99 / 9	38
0.15	b	51		poison oak	Toxicodendron diversilobum	99 / 9	43
0.15	r	52		laurel sumac	Malosma laurina	10 / 3	42
0.15	b	53		California brome	Bromus carinatus var. carinatus	5 / 2	24
0.15	r			(heartleaf penstemon, Keckiella cordifolia)
0.15				Cross wooded drainage
0.15	b	54		California sweet-cicely	Osmorhiza brachypoda	50 / 9	6
0.15	r	55		blue wildrye	Elymus glaucus ssp. glaucus	40 / 9	21
0.15	r	56		*cut-leaved geranium	Geranium dissectum	50 / 4	13
0.15	r	57		*weak blue grass	Poa infirma	30 / 2	6
0.16	r	58		*common groundsel	Senecio vulgaris	2 / 1	18
0.16	r			Either an unusual coast live oak, or possibly a hybrid with interior live oak, Quercus agrifolia var. agrifolia X Quercus wislizeni var. frutescens⁺
0.16	l	59		leafy daisy	Erigeron foliosus var. foliosus	4 / 3	44
0.16	l	60		fragrant everlasting	Gnaphalium canescens ssp. beneolens	2 / 2	23
0.16	r	61		blue larkspur	Delphinium parryi ssp. parryi	20 / 2	14
0.17	l			A white-flowered "blue-eyed grass", Sisyrinchium bellum
0.17	b	62		dove weed	Eremocarpus setigerus	10 / 2	25
0.17	r	63		shooting star	Dodecatheon clevelandii ssp. clevelandii	50 / 5	11
0.17	r			Beautiful field of shooting stars.
0.17	l			(American vetch, Vicia americana var. americana; white-flowering currant, Ribes indecorum)
0.17	b	64		slender cottonweed	Micropus californicus var. californicus	99 / 5	7
0.17	r	65		California lotus	Lotus wrangelianus	99 / 5	4
0.17	l	66		Gambel's dwarf milk-vetch	Astragalus gambelianus	40 / 2	4
0.17	l	67		vinegar weed	Trichostema lanceolatum	10 / 2	15
0.17	b	68		*nit grass	Gastridium ventricosum	99 / 9	26
0.17	b	69		*red brome	Bromus madritensis ssp. rubens	/	53
0.17	l	70		*goldentop	Lamarckia aurea	10 / 1	24
0.18	l			(San Diego wreathplant, Stephanomeria diegensis)
0.19	r	71		johnny jump-up	Viola pedunculata	20 / 4	16
0.19	l	72		California buckwheat	Eriogonum fasciculatum var. foliolosum	3 / 2	51
0.19	r	73		California plantain	Plantago erecta	99 / 9	13
0.19	r	74		earth brodiaea	Brodiaea terrestris ssp. kernensis	10 / 1	7
0.19	r			Nice field of needlegrass.
0.21	b	75		*mouse-ear chickweed	Cerastium glomeratum	50 / 9	19
0.21	r			(Italian thistle, Carduus pycnocephalus)
0.21	r			(soap plant, Chlorogalum pomeridianum var. pomeridianum)
0.21	r	76		three spot	Osmadenia tenella	30 / 1	15
0.22	r	77		*sand spurrey	Spergularia bocconei	20 / 2	14
0.23	r	78		coast jepsonia	Jepsonia parryi	30 / 2	15
0.23	r	79		*barbgrass	Hainardia cylindrica	40 / 2	1
0.24	l	80		deerweed	Lotus scoparius var. scoparius	40 / 5	29
0.24	b	81		Torrey's scrub oak	Quercus acutidens	50 / 9	26
0.24	r	82		wild-cucumber	Marah macrocarpus var. macrocarpus	4 / 4	44
0.24	r	83		heartleaf penstemon	Keckiella cordifolia	10 / 3	28
0.24	r	84		splendid mariposa lily	Calochortus splendens	10 / 9	20
0.24	r	85		soap plant	Chlorogalum pomeridianum var. pomeridianum	50 / 9	19
0.24	r	86		white-flowering currant	Ribes indecorum	1 / 1	22
0.24	r	87		Pacific sanicle	Sanicula crassicaulis	30 / 9	20
0.24	r	88		holly-leaf navarretia	Navarretia atractyloides	50 / 9	9
0.24	r	89		*tiny bedstraw	Galium murale	99 / 9	2
0.24	r	90		California sagebrush	Artemisia californica	50 / 9	47
0.25	b	91		bristly bird's beak	Cordylanthus rigidus ssp. setigerus	50 / 9	28
0.25	r			(coyote bush, Baccharis pilularis)
0.25	r	92		chamise	Adenostoma fasciculatum	20 / 9	37
0.25	r	93		golden yarrow	Eriophyllum confertiflorum var. confertiflorum	20 / 9	55
0.25	r	94		saw-toothed goldenbush	Hazardia squarrosa var. grindelioides	3 / 2	35
0.25	r	95		Parish's purple nightshade	Solanum parishii	20 / 4	20
0.25	b	96		San Diego pea	Lathyrus vestitus var. alefeldii	4 / 3	21
0.25	r			(meadow-rue, Thalictrum fendleri var. polycarpum)
0.26	r	97		purple head	Acourtia microcephala	1 / 1	19
0.26	l	98		black sage	Salvia mellifera	10 / 5	40
0.26	r	99		slender vetch	Vicia hassei	10 / 2	6
0.26	r	100		narrowleaf bedstraw	Galium angustifolium ssp. angustifolium	2 / 2	50
0.26	r	101		southern foothill penstemon	Penstemon heterophyllus var. australis	20 / 2	2
0.26	r	102		white sage	Salvia apiana	10 / 5	38
0.27				(goldback fern, Pentagramma triangularis ssp. triangularis)
0.27	r	103		pygmy-weed	Crassula connata	99 / 9	28
0.27	r	104		goldfields	Lasthenia californica	2 / 1	12
0.27	r	105		toad rush	Juncus bufonius var. bufonius	/	14
0.28	r			Corestone eroding out of the Woodson Mountain granodiorite
0.30	r	106		western lady's mantle	Aphanes occidentalis	30 / 2	3
0.32	b	107		San Diego birdsfoot lotus	Lotus hamatus	30 / 2	24
0.32	r	108		goldenstar	Bloomeria crocea	2 / 2	12
0.34	l	109		*tocalote	Centaurea melitensis	20 / 9	45
0.34	c	110		*pineapple weed	Chamomilla suaveolens	1 / 1	19
0.34	r	111		slender wreathplant	Stephanomeria exigua ssp. deanei	2 / 2	14
0.34	r	112		San Diego mountain mahogany	Cercocarpus minutiflorus	4 / 2	12
0.35	r	113		*common chickweed (no petals in first location!)	Stellaria media⁺	30 / 2	25
0.35	l	114		*olive	Olea europaea	4 / 4	10
0.35	r	115		Eastwood manzanita	Arctostaphylos glandulosa ssp. zacaensis	2 / 1	11
0.37	b	116		bush monkeyflower	Mimulus aurantiacus	10 / 7	42
0.39	l	117		*scarlet pimpernel	Anagallis arvensis	50 / 9	33
0.39	r	118		long-leaf plantain	Plantago elongata	99 / 2	2
0.40	r	119		eucrypta	Eucrypta chrysanthemifolia var. chrysanthemifolia	20 / 3	25
0.41	b	120		rusty-haired popcorn flower	Plagiobothrys nothofulvus	40 / 3	13
0.42	l	121		*hedge mustard	Sisymbrium officinale	50 / 4	20
0.42	r			(Woodrat's nest in tree)
0.43	b	122		Pomona locoweed	Astragalus pomonensis	2 / 1	11
0.43	l	123		canchalagua	Centaurium venustum	3 / 1	15
0.43	r	124	~	canyon clarkia	Clarkia epilobioides	10 / 1	11
0.43	b	125		rattlesnake weed	Daucus pusillus	40 / 9	29
0.43	l			(white everlasting, Gnaphalium canescens ssp. microcephalum)
0.43	l	126		short-winged deerweed	Lotus scoparius var. brevialatus	2 / 1	23
0.44				Jct. with Punta Mesa Trail; go left; elevation 1800 feet (549 m); sign: "Adobe Loop / Punta Mesa Trail"; trail now descends
0.44	r	127		strigose lotus	Lotus strigosus	2 / 1	35
0.44	r	128		southern Indian pink	Silene laciniata ssp. major	/	20
0.45	l	129		Spanish clover	Lotus purshianus var. purshianus	/	31
0.45	l	130		Chinese houses	Collinsia heterophylla⁺	50 / 2	14
0.45	r	131		giant wild-rye	Leymus condensatus	2 / 2	27
0.45	b			common chickweed, Stellaria media, with petals
0.47	l	132		basketbush	Rhus trilobata	1 / 1	24
0.52	r			(Beehive in tree)
0.52	r	133		telegraph weed	Heterotheca grandiflora	/	37
0.53	l	134		tree clover	Trifolium ciliolatum	10 / 1	12
0.54	l	135	~	*yellow salsify	Tragopogon dubius⁺	1 / 1	13
0.54	r	136		western sycamore	Platanus racemosa	1 / 1	27
0.54	b	137		*bull thistle	Cirsium vulgare	30 / 9	19
0.55				Trail turns left 90°
0.55	r	138		western ragweed	Ambrosia psilostachya	50 / 9	37
0.56	l	139		*sourclover	Melilotus indicus	5 / 1	24
0.56	l			Field of autumn willowweed, Epilobium brachycarpum
0.56	l	140		autumn willowweed	Epilobium brachycarpum	10 / 1	4
0.56	r	141		arroyo willow	Salix lasiolepis	2 / 2	35
0.57	b	142		*Himalaya blackberry	Rubus discolor	10 / 3	3
0.58				Cross drainage; elevation 1760 feet (536 m); trail curves left
0.58	l	143		rigid hedge-nettle	Stachys ajugoides var. rigida	5 / 2	13
0.59	b	144		California poppy	Eschscholzia californica	10 / 2	29
0.60	r	145		creeping wild rye	Leymus triticoides	20 / 2	12
0.60	r			Field of slender madia, Madia gracilis
0.60	l	146		*field hedge-parsley	Torilis arvensis	50 / 1	6
0.60	r			(shining willow, Salix lucida ssp. lasiandra)
0.60	r	147		saltgrass	Distichlis spicata	20 / 2	17
0.60				Cross very small drainage
0.61	c	148		Mexican rush	Juncus mexicanus	10 / 3	16
0.62	r			Cross just above head of drainage
0.62		149		*fennel	Foeniculum vulgare⁺	1 / 1	13
0.66	l	150		blue elderberry	Sambucus mexicana	2 / 2	48
0.66	r			(hybrid wild-rye, Leymus Xmultiflorus = L. condensatus X L. triticoides)
0.67	r			(red willow, Salix laevigata⁺)
0.69	r			(In drainage: Pacific rush, Juncus effusus var. pacificus; wrinkled rush, Juncus rugulosus; sand spikerush, Eleocharis montevidensis; cocklebur, Xanthium strumarium; spike primrose, Epilobium densiflorum; narrow-leaf milkweed, Asclepias fascicularis; Emory's baccharis, Baccharis emoryi; mule fat, Baccharis salicifolia; water cress, Rorippa nasturtium-aquaticum)
0.69	r			(deergrass, Muhlenbergia rigens)
0.70	l			Sign: "Trail Closed" (for path leading to Reserve Resource Manager's House)
0.72	r			(pecan, Carya illinoensis)
0.72	r	151		*dallis grass	Paspalum dilatatum	1 / 1	10
0.73	l	152		Indian milkweed	Asclepias eriocarpa	10 / 2	18
0.73	r			(bristly ox-tongue, Picris echioides)
0.73				Enter riparian woodland.
0.76	r			Sign: "When Rock and Water Meet" (tenaja); go to the tenaja for the next two species
0.76	r	153		panicled bulrush	Scirpus microcarpus	30 / 2	2
0.76	r	154		*grass poly	Lythrum hyssopifolia	5 / 1	15
0.79	l			Red bench
0.81	l			Virginia C. House Bench
0.82				Begin bridge over Ranch Creek
0.82	l	155		narrow-leaf milkweed	Asclepias fascicularis	5 / 1	8
0.82	l	156		sand spikerush	Eleocharis montevidensis	10 / 1	7
0.82	l	157		Pacific rush	Juncus effusus var. pacificus	1 / 1	4
0.82	l	158		*English plantain	Plantago lanceolata	1 / 1	19
0.82	b	159		*spearmint	Mentha spicata var. spicata	10 / 1	4
0.82	l	160		water cress	Rorippa nasturtium-aquaticum	2 / 1	11
0.82	l	161		Hooker's evening-primrose	Oenothera elata ssp. hirsutissima⁺	2 / 1	10
0.82	l			(giant chain fern, Woodwardia fimbriata)
0.82	l	162		scarlet monkeyflower	Mimulus cardinalis	2 / 1	15
0.82				End bridge
0.82	r	163		clustered field sedge	Carex praegracilis	3 / 2	9
0.83				Trail turns left 90°
0.83	l	164		*little horseweed	Conyza bonariensis	1 / 1	16
0.85	l			(greater periwinkle, Vinca major, on far bank)
0.87	l	165		Vasey's prickly-pear	Opuntia vaseyi	1 / 1	24
0.89	l			Sign: "Sensitive wetland area. Do not enter".
0.89				Trail jogs right. Note granary branch on ground; it was hanging just above your head over the trail until 2006
0.90	l	166		*orchard-grass	Dactylis glomerata	20 / 2	3
0.90	l	167		*whorled dock	Rumex conglomeratus	1 / 1	11
0.95				End Adobe Loop Trail at jct. with Lomas Trail; elevation 1840 feet (561 m)

Number of Stamens	Number of Flowers With That Number of Stamens
2	5
3	11
4	3
5	1

Go to:

Plant Trail Guides For The Santa Rosa Plateau
Field Guide to the Santa Rosa Plateau: Plants

Copyright © 2002-2006 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:
http://tchester.org/srp/plants/guides/adobe_loop.html
Comments and feedback: Tom Chester
Updated 28 April 2006.