Plant Guide to Mt. Wilson Toll Road / Horse Trail Loop, Eaton Canyon, San Gabriel Mountains

Plant Guide to Mt. Wilson Toll Road / Horse Trail Loop, Eaton Canyon, San Gabriel Mountains

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
Plant Communities and Floristics
Fieldwork Dates and Summary of List Changes With Time
The Plant Guide
Comments On Specific Species
Introduction

Directions to the trailhead:
From I-210 East: Take the Altadena Drive Exit, and go north on Altadena Drive.
From I-210 West: Take the San Gabriel Boulevard Exit (signed for Eaton Canyon Nature Center), continue past Sierra Madre to Altadena Drive, and turn right (north) on Altadena Drive.
Take Altadena Drive north about 2.5 miles to Crescent Drive and turn right. Turn right at the next block, Pinecrest Drive. The trailhead is at the gate as Pinecrest Drive curves left.
Parking on Pinecrest Drive is limited to 2 hours on the weekdays and not at all on the weekends, thanks to the selfish neighbors there (see 26-1 Eaton Canyon Nature Center to Henninger Flats). So if you'll be there more than 2 hours, simply park one block away.
See also Eaton Canyon and Flora of Lower Eaton Canyon.
Highlights of This Trail

Most people would consider this trail to be in coastal sage scrub. Believe it or not, this trail is in the Mixed Hardwood Forest vegetation classification of Kuchler.
Our list contains 120 taxa, of which 117 have so far been identified, in about 1.49 miles of trail, and 2 of the unidentified species are clearly planted and non-native to Eaton Canyon. Of these 119 taxa, 36 (30%) are non-native. These numbers are all roughly average for trails at this elevation.
The botanical highlights of this trail are:

Plant Communities and Floristics

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. We had 73 trails in our database when this histogram was made; 3 of those trails, including this one, are in Eaton Canyon. A number of "1" means the taxon has only been found on this trail among the trails in our database; numbers of "3" or smaller may indicate taxa found only in this area. A number of "1" means the taxon has only been found on this trail among the trails in our database.
We have two additional trails about six miles to the west / northwest.

Number of Trails
Containing A Taxon Number Of Taxa
On This Trail % of Taxa
On This Trail
1 6 5%
2 3 3%
3 5 4%
4 3 3%
5 3 3%

1-5 20 17%
6-10 17 15%
11-15 28 24%
16-20 16 14%
21-25 9 8%
26-30 12 10%
31-35 11 9%
36-40 4 3%
Total Taxa 117 100%

We found 3 additional species not in the above table, since they have not been 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.
The taxa that are truly unique to this trail or area, out of our 73 trails on 24 January 2004, are:

#all Latin Name Common Name Distribution in Southern California / Distribution in Trail Guides
1 Camissonia confusa San Bernardino sun-cup SW. It may be uncommon because it is possibly a hybrid between C. hirtella and C. pallida ssp. pallida.
1 Encelia actoni Acton's encelia sw SnJV and adjacent WTR (Cuyama Valley), w D and adjacent CA-FP. Possibly introduced into this location through seeds carried on automobile tires from near Acton.
1 Castilleja foliolosa woolly Indian paintbrush The Jepson Manual thinks it is only in s ChI, but Munz says coastal sage scrub, chaparral from Baja to northern California. We have it in 15 floras in Southern California.
1 Coreopsis bigelovii Bigelow's coreopsis TR, DMoj, n Dson.
2 Lepidium virginicum var. robinsonii Robinson's pepper-grass Uncommon; SW.
2 Quercus durata var. gabrielensis X Q. engelmannii Engelmann leather oak hybrid SnGb (s slope)
3 Delphinium cardinale scarlet larkspur SW. We have it only in 3 front-range SnGb trails.
3 Chenopodium botrys Jerusalem oak Most of California. We have it only in 2 front-range SnGb trails plus the Manzanita Trail on Mt. Baden-Powell in the SnGb.
3 Quercus durata var. gabrielensis San Gabriel Mtns. leather oak SnGb (s slope)
3 Juglans californica var. californica Southern California black walnut SCo, s TR, n PR (Santa Ana Mountains). We have it only in 3 front-range SnGb trails.

The following taxa are listed as being found only on this trail or in this area, but are planted specimens:

#all Latin Name Common Name Comment
1 Quercus lobata Valley oak Native to nw SCo, ChI, WTR, w SnGb, but not to Eaton Canyon.
1 Casuarina equisetifolia Australian pine Planted species; non-native.

The following taxa are listed as being found only on this trail or in this area, but are not unique for the reasons given below:

#all Latin Name Common Name Comment
2 Eriodictyon crassifolium thick-leaved yerba santa ssp id needed
3 Hordeum murinum foxtail barley plants do not key to subspecies

Both of these are common taxa, which have been identified to subspecies in many other trail lists.
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"
3/27/2003 1 121 3 3 6 7
1/22/2004 2 120 2 3 3 1

Only the first 0.16 miles was covered on 1/22/04.
We thank Jason Hollinger for the correct identification of Chamaesyce melanadenia in February 2006.
The Plant Guide

Version for printing, without lines and other text on this page (5 pages)

Mile s # id? Common Name Latin Name #here #all
0.00 Begin plant guide immediately after passing through gate at Pinecrest Drive; elevation 1320 feet.
0.00 r 1 mule fat Baccharis salicifolia 5 / 2 28
0.00 r 2 wild-cucumber Marah macrocarpus var. macrocarpus 5 / 2 34
0.00 r 3 *smilo grass Piptatherum miliaceum 50 / 9 16
0.00 r 4 California sagebrush Artemisia californica / 32
0.00 r 5 *ripgut brome Bromus diandrus / 34
0.00 r 6 branching phacelia Phacelia ramosissima var. latifolia 20 / 5 23
0.00 r 7 *shortpod mustard Hirschfeldia incana 50 / 9 38
0.00 r 8 *Oriental mustard Sisymbrium orientale / 7
0.00 r 9 *white goosefoot Chenopodium album 20 / 2 11
0.00 r 10 bur-ragweed Ambrosia acanthicarpa 20 / 4 13
0.00 r 11 *foxtail barley Hordeum murinum⁺ 99 / 9 3
0.00 r 12 *redstem filaree Erodium cicutarium 50 / 5 32
0.00 r 13 California buckwheat Eriogonum fasciculatum var. foliolosum 30 / 5 38
0.00 r 14 lanceleaf dudleya Dudleya lanceolata 30 / 3 16
0.00 r 15 coast live oak Quercus agrifolia var. agrifolia 3 / 3 31
0.00 l 16 short-leaved cliff-aster Malacothrix saxatilis var. tenuifolia 20 / 5 9
0.01 l 17 *tree tobacco Nicotiana glauca 20 / 5 15
0.01 l 18 short-winged deerweed Lotus scoparius var. brevialatus⁺ 20 / 5 13
0.01 l 19 California brickellbush Brickellia californica 20 / 5 23
0.01 r 20 *slender wild oats Avena barbata / 19
0.01 l 21 white everlasting Gnaphalium canescens ssp. microcephalum 20 / 5 30
0.01 l 22 golden yarrow Eriophyllum confertiflorum var. confertiflorum 20 / 5 40
0.01 l 23 bush monkeyflower Mimulus aurantiacus 20 / 5 31
0.01 r 24 *windmill pink Silene gallica 20 / 5 21
0.01 b 25 eucrypta Eucrypta chrysanthemifolia var. chrysanthemifolia / 15
0.01 r 26 long-stemmed buckwheat Eriogonum elongatum var. elongatum 20 / 5 17
0.01 r 27 laurel sumac Malosma laurina 3 / 3 29
0.01 l 28 ~ blue dicks Dichelostemma capitatum ssp. capitatum⁺ / 28
l 29 Bigelow's spike-moss Selaginella bigelovii 20 / 5 13
0.02 l 30 narrowleaf bedstraw Galium angustifolium ssp. angustifolium 10 / 3 39
l 31 common bedstraw Galium aparine 30 / 5 20
l 32 prickly cryptantha Cryptantha muricata / 13
l 33 coffee fern Pellaea andromedifolia 5 / 2 17
l 34 Robinson's pepper-grass Lepidium virginicum var. robinsonii 30 / 3 2
l 35 wild sweetpea Lathyrus vestitus var. vestitus 5 / 1 7
l 36 *common chickweed Stellaria media 30 / 5 16
l 37 California polypody Polypodium californicum 20 / 3 12
r 38 *castor bean Ricinus communis 20 / 5 12
l 39 small-flowered melica Melica imperfecta / 25
l 40 leafy daisy Erigeron foliosus var. foliosus / 29
l 41 *sow thistle Sonchus oleraceus / 21
l 42 scarlet larkspur Delphinium cardinale 5 / 1 3
l 43 bicolored everlasting Gnaphalium bicolor 10 / 3 20
l 44 southern Indian pink Silene laciniata ssp. major 10 / 2 11
l liverworts
l 45 sp *rose clover Trifolium hirtum / 5
l 46 California everlasting Gnaphalium californicum 2 / 1 24
r 47 *petty spurge Euphorbia peplus / 6
l 48 ~ globe gilia Gilia capitata ssp. abrotanifolia 10 / 1 4
l 49 California chicory Rafinesquia californica / 14
0.07 Road turns right at drainage. Plants downhill are mostly weedy non-natives; plants uphill are mostly native.
r 50 giant wild rye Leymus condensatus 5 / 1 22
l 51 California suncup Camissonia californica / 13
l 52 wild canterbury bells Phacelia minor / 12
l 53 chia Salvia columbariae 30 / 5 17
l 54 white sage Salvia apiana 20 / 5 27
l 55 *goldentop Lamarckia aurea / 11
l 56 California dodder Cuscuta californica var. californica / 12
l San Gabriel thrust fault exposed; look for bedrock on top of alluvium!
l 57 *Spanish broom Spartium junceum 5 / 2 7
r 58 *narrowleaf filago Filago gallica / 29
l 59 *red brome Bromus madritensis ssp. rubens / 35
l 60 *hairy rattail fescue Vulpia myuros var. hirsuta / 9
l 61 *tocalote Centaurea melitensis 5 / 1 32
l 62 *common groundsel Senecio vulgaris 3 / 1 11
0.13 l Jct. Altadena Crest Trail
r 63 Coulter's lupine Lupinus sparsiflorus 30 / 5 7
l 64 *Jerusalem oak Chenopodium botrys 5 / 1 3
l 65 chaparral yucca Yucca whipplei 3 / 3 20
l 66 San Bernardino sun-cup Camissonia confusa / 1
r 67 *giant reed Arundo donax 5 / 2 7
(bird's-foot fern, Pellaea mucronata var. mucronata)
l 67 Vasey's prickly pear Opuntia Xvaseyi 1 / 1 15
l 68 ~ popcorn flower Cryptantha intermedia / 18
0.15 Beginning of bridge over Eaton Wash; elevation 1240 feet.
b 69 white alder Alnus rhombifolia 3 / 1 9
0.16 End bridge
l Check for Nevin's brickellia, Brickellia nevinii.
0.16 r Jct. Eaton Canyon Park Main Road; continue straight on Toll Road.
l 70 California fuchsia Epilobium canum ssp. canum / 11
r 71 sp *Cypress sp. Cupressus sp.⁺ / 1
l 72 ssp thick-leaved yerba santa Eriodictyon crassifolium / 2
r 73 dwarf lupine Lupinus bicolor / 17
l 74 California poppy Eschscholzia californica / 20
l 75 creek senecio Senecio flaccidus var. douglasii / 9
l 76 *bermuda grass Cynodon dactylon / 15
l 77 collar lupine Lupinus truncatus / 16
r 78 *smooth cat's ear Hypochaeris glabra / 21
r 79 birch-leaf mountain-mahogany Cercocarpus betuloides var. betuloides / 14
r 80 annual sunflower Helianthus annuus / 8
r 81 sp *planted 3 needle (Jeffrey?) pine Pinus sp.⁺ /
r 82 *Valley oak Quercus lobata⁺ / 1 1
r Large drain on ridgeline.
r 83 *black locust Robinia pseudoacacia⁺ / 1 6
0.43 Cross drainage
l Best field of Coulter's lupine, Lupinus sparsiflorus.
r Road drain.
l 84 pygmy-weed Crassula connata / 11
r Turnout.
r 85 Acton's encelia Encelia actoni / 1
r Road drain.
r Turnout.
r 86 *Australian pine Casuarina equisetifolia⁺ / 1
r Sign with Bicycle Rules
l 87 black sage Salvia mellifera / 29
r Road drain.
r 88 *California burclover Medicago polymorpha / 26
l (Giant needlegrass, Achnatherum coronatum)
l 89 white nightshade Solanum douglasii / 12
Cross weird drainage.
l 90 red-gland spurge Chamaesyce melanadenia / 8
r 91 stinging lupine Lupinus hirsutissimus / 11
r Small drain.
l 92 *fountain grass Pennisetum setaceum / 8
0.62 Cross drainage with interesting alcove / dry waterfall on left.
l 93 hollyleaf redberry Rhamnus ilicifolia / 31
0.85 Cross large drainage with a flat-topped low retaining wall, good for sitting on.
l 94 bittercress Cardamine oligosperma / 5
l 95 threadstem Pterostegia drymarioides / 14
l 96 narrow-leaved miner's lettuce Claytonia parviflora ssp. parviflora / 8
l 97 miner's lettuce Claytonia perfoliata ssp. perfoliata / 12
l 98 hollyleaf cherry Prunus ilicifolia ssp. ilicifolia / 9
l 99 heartleaf penstemon Keckiella cordifolia / 19
r 100 poison oak Toxicodendron diversilobum / 29
r 101 toyon Heteromeles arbutifolia / 35
l 102 goldback fern Pentagramma triangularis ssp. triangularis / 12
l 103 California lace fern Aspidotis californica / 4
l 104 woolly Indian paintbrush Castilleja foliolosa / 1
0.98 r Jct. Horse Trail down to lower Eaton Canyon; take it; elevation 1635 feet.
l 105 south coast morning-glory Calystegia macrostegia ssp. intermedia / 12
l 106 sugar bush Rhus ovata / 19
r 107 ? the unknown ~agave mystery plant from sunset ridge
l Firecracker Plantation, where the 1993 fire was started by a transient.
l (Unk. pine tree, not P. halapensis)
r 108 *olive Olea europaea / 8
r 109 saw-toothed goldenbush Hazardia squarrosa var. grindelioides / 26
l 110 Bigelow's coreopsis Coreopsis bigelovii / 1
r 111 San Gabriel Mtns. leather oak Quercus durata var. gabrielensis / 3
b 112 chamise Adenostoma fasciculatum / 27
r 113 *Russian thistle Salsola tragus / 22
r 114 bristly goldenaster Heterotheca sessiliflora ssp. echioides / 5
r (blue elderberry, Sambucus mexicana)
l 115 ? Helianthus gracilentus?
l 116 Engelmann leather oak hybrid Quercus durata var. gabrielensis X Q. engelmannii / 2
r 117 blue elderberry Sambucus mexicana / 34
r (Check for possible Quercus durata X Q. berberidifolia.)
l 118 Southern California black walnut Juglans californica var. californica / 3
l 119 *blue gum Eucalyptus globulus / 4
r 120 California coffeeberry Rhamnus californica ssp. californica / 12
1.49 End guide at jct. with Main Eaton Canyon Road; elevation 1080 feet.

Comments On Specific Species

Hordeum murinum. These are perfect ssp. leporinum in Munz, with 4.7 spikelets per cm of rachis, male lateral spikelets, and an inflorescence that is partially sheathed. However, they key to ssp. glaucum in JM, with the central floret slightly < lateral florets and the anthers of lateral florets ~2x anthers of central floret! The central lemma awn is slightly longer than the lateral lemma awns, not shorter, per the JM description.
Hence we have chosen to not give a subspecies here, and will accumulate further data from other locations to see how common this situation is.
Lotus scoparius var. brevialatus. The subspecies was determined from plants later on the trail; thus it is possible that this specimen is var. scoparius, since both varieties are found in the vicinity.
Dichelostemma capitatum ssp. capitatum. Only leaves were seen at this location, hence the ~ in the id? column. This taxon was found later on the trail.
Cupressus sp., Pinus sp., Quercus lobata, Robinia pseudoacacia, and Casuarina equisetifolia. The Sierra Club hikers who use this trail, in a well-intentioned by uninformed action, planted these species along the south side of the trail to eventually provide shade for hikers and bikers along this very unshaded route.

Number of Trails Containing A Taxon	Number Of Taxa On This Trail	% of Taxa On This Trail
1	6	5%
2	3	3%
3	5	4%
4	3	3%
5	3	3%

1-5	20	17%
6-10	17	15%
11-15	28	24%
16-20	16	14%
21-25	9	8%
26-30	12	10%
31-35	11	9%
36-40	4	3%
Total Taxa	117	100%

#all	Latin Name	Common Name	Distribution in Southern California / Distribution in Trail Guides
1	Camissonia confusa	San Bernardino sun-cup	SW. It may be uncommon because it is possibly a hybrid between C. hirtella and C. pallida ssp. pallida.
1	Encelia actoni	Acton's encelia	sw SnJV and adjacent WTR (Cuyama Valley), w D and adjacent CA-FP. Possibly introduced into this location through seeds carried on automobile tires from near Acton.
1	Castilleja foliolosa	woolly Indian paintbrush	The Jepson Manual* thinks it is only in s ChI, but Munz says coastal sage scrub, chaparral from Baja to northern California*. We have it in 15 floras in Southern California.
1	Coreopsis bigelovii	Bigelow's coreopsis	TR, DMoj, n Dson.
2	Lepidium virginicum var. robinsonii	Robinson's pepper-grass	Uncommon; SW.
2	Quercus durata var. gabrielensis X Q. engelmannii	Engelmann leather oak hybrid	SnGb (s slope)
3	Delphinium cardinale	scarlet larkspur	SW. We have it only in 3 front-range SnGb trails.
3	Chenopodium botrys	Jerusalem oak	Most of California. We have it only in 2 front-range SnGb trails plus the Manzanita Trail on Mt. Baden-Powell in the SnGb.
3	Quercus durata var. gabrielensis	San Gabriel Mtns. leather oak	SnGb (s slope)
3	Juglans californica var. californica	Southern California black walnut	SCo, s TR, n PR (Santa Ana Mountains). We have it only in 3 front-range SnGb trails.

#all	Latin Name	Common Name	Comment
1	Quercus lobata	Valley oak	Native to nw SCo, ChI, WTR, w SnGb, but not to Eaton Canyon.
1	Casuarina equisetifolia	Australian pine	Planted species; non-native.

#all	Latin Name	Common Name	Comment
2	Eriodictyon crassifolium	thick-leaved yerba santa	ssp id needed
3	Hordeum murinum	foxtail barley	plants do not key to subspecies

Visit Date	Visit #	# taxa	# "?"	# "sp"	# "~"	# "ssp"
3/27/2003	1	121	3	3	6	7
1/22/2004	2	120	2	3	3	1

Mile	s	#	id?	Common Name	Latin Name	#here	#all
0.00				Begin plant guide immediately after passing through gate at Pinecrest Drive; elevation 1320 feet.
0.00	r	1		mule fat	Baccharis salicifolia	5 / 2	28
0.00	r	2		wild-cucumber	Marah macrocarpus var. macrocarpus	5 / 2	34
0.00	r	3		*smilo grass	Piptatherum miliaceum	50 / 9	16
0.00	r	4		California sagebrush	Artemisia californica	/	32
0.00	r	5		*ripgut brome	Bromus diandrus	/	34
0.00	r	6		branching phacelia	Phacelia ramosissima var. latifolia	20 / 5	23
0.00	r	7		*shortpod mustard	Hirschfeldia incana	50 / 9	38
0.00	r	8		*Oriental mustard	Sisymbrium orientale	/	7
0.00	r	9		*white goosefoot	Chenopodium album	20 / 2	11
0.00	r	10		bur-ragweed	Ambrosia acanthicarpa	20 / 4	13
0.00	r	11		*foxtail barley	Hordeum murinum⁺	99 / 9	3
0.00	r	12		*redstem filaree	Erodium cicutarium	50 / 5	32
0.00	r	13		California buckwheat	Eriogonum fasciculatum var. foliolosum	30 / 5	38
0.00	r	14		lanceleaf dudleya	Dudleya lanceolata	30 / 3	16
0.00	r	15		coast live oak	Quercus agrifolia var. agrifolia	3 / 3	31
0.00	l	16		short-leaved cliff-aster	Malacothrix saxatilis var. tenuifolia	20 / 5	9
0.01	l	17		*tree tobacco	Nicotiana glauca	20 / 5	15
0.01	l	18		short-winged deerweed	Lotus scoparius var. brevialatus⁺	20 / 5	13
0.01	l	19		California brickellbush	Brickellia californica	20 / 5	23
0.01	r	20		*slender wild oats	Avena barbata	/	19
0.01	l	21		white everlasting	Gnaphalium canescens ssp. microcephalum	20 / 5	30
0.01	l	22		golden yarrow	Eriophyllum confertiflorum var. confertiflorum	20 / 5	40
0.01	l	23		bush monkeyflower	Mimulus aurantiacus	20 / 5	31
0.01	r	24		*windmill pink	Silene gallica	20 / 5	21
0.01	b	25		eucrypta	Eucrypta chrysanthemifolia var. chrysanthemifolia	/	15
0.01	r	26		long-stemmed buckwheat	Eriogonum elongatum var. elongatum	20 / 5	17
0.01	r	27		laurel sumac	Malosma laurina	3 / 3	29
0.01	l	28	~	blue dicks	Dichelostemma capitatum ssp. capitatum⁺	/	28
	l	29		Bigelow's spike-moss	Selaginella bigelovii	20 / 5	13
0.02	l	30		narrowleaf bedstraw	Galium angustifolium ssp. angustifolium	10 / 3	39
	l	31		common bedstraw	Galium aparine	30 / 5	20
	l	32		prickly cryptantha	Cryptantha muricata	/	13
	l	33		coffee fern	Pellaea andromedifolia	5 / 2	17
	l	34		Robinson's pepper-grass	Lepidium virginicum var. robinsonii	30 / 3	2
	l	35		wild sweetpea	Lathyrus vestitus var. vestitus	5 / 1	7
	l	36		*common chickweed	Stellaria media	30 / 5	16
	l	37		California polypody	Polypodium californicum	20 / 3	12
	r	38		*castor bean	Ricinus communis	20 / 5	12
	l	39		small-flowered melica	Melica imperfecta	/	25
	l	40		leafy daisy	Erigeron foliosus var. foliosus	/	29
	l	41		*sow thistle	Sonchus oleraceus	/	21
	l	42		scarlet larkspur	Delphinium cardinale	5 / 1	3
	l	43		bicolored everlasting	Gnaphalium bicolor	10 / 3	20
	l	44		southern Indian pink	Silene laciniata ssp. major	10 / 2	11
	l			liverworts
	l	45	sp	*rose clover	Trifolium hirtum	/	5
	l	46		California everlasting	Gnaphalium californicum	2 / 1	24
	r	47		*petty spurge	Euphorbia peplus	/	6
	l	48	~	globe gilia	Gilia capitata ssp. abrotanifolia	10 / 1	4
	l	49		California chicory	Rafinesquia californica	/	14
0.07				Road turns right at drainage. Plants downhill are mostly weedy non-natives; plants uphill are mostly native.
	r	50		giant wild rye	Leymus condensatus	5 / 1	22
	l	51		California suncup	Camissonia californica	/	13
	l	52		wild canterbury bells	Phacelia minor	/	12
	l	53		chia	Salvia columbariae	30 / 5	17
	l	54		white sage	Salvia apiana	20 / 5	27
	l	55		*goldentop	Lamarckia aurea	/	11
	l	56		California dodder	Cuscuta californica var. californica	/	12
	l			San Gabriel thrust fault exposed; look for bedrock on top of alluvium!
	l	57		*Spanish broom	Spartium junceum	5 / 2	7
	r	58		*narrowleaf filago	Filago gallica	/	29
	l	59		*red brome	Bromus madritensis ssp. rubens	/	35
	l	60		*hairy rattail fescue	Vulpia myuros var. hirsuta	/	9
	l	61		*tocalote	Centaurea melitensis	5 / 1	32
	l	62		*common groundsel	Senecio vulgaris	3 / 1	11
0.13	l			Jct. Altadena Crest Trail
	r	63		Coulter's lupine	Lupinus sparsiflorus	30 / 5	7
	l	64		*Jerusalem oak	Chenopodium botrys	5 / 1	3
	l	65		chaparral yucca	Yucca whipplei	3 / 3	20
	l	66		San Bernardino sun-cup	Camissonia confusa	/	1
	r	67		*giant reed	Arundo donax	5 / 2	7
				(bird's-foot fern, Pellaea mucronata var. mucronata)
	l	67		Vasey's prickly pear	Opuntia Xvaseyi	1 / 1	15
	l	68	~	popcorn flower	Cryptantha intermedia	/	18
0.15				Beginning of bridge over Eaton Wash; elevation 1240 feet.
	b	69		white alder	Alnus rhombifolia	3 / 1	9
0.16				End bridge
	l			Check for Nevin's brickellia, Brickellia nevinii.
0.16	r			Jct. Eaton Canyon Park Main Road; continue straight on Toll Road.
	l	70		California fuchsia	Epilobium canum ssp. canum	/	11
	r	71	sp	*Cypress sp.	Cupressus sp.⁺	/ 1
	l	72	ssp	thick-leaved yerba santa	Eriodictyon crassifolium	/	2
	r	73		dwarf lupine	Lupinus bicolor	/	17
	l	74		California poppy	Eschscholzia californica	/	20
	l	75		creek senecio	Senecio flaccidus var. douglasii	/	9
	l	76		*bermuda grass	Cynodon dactylon	/	15
	l	77		collar lupine	Lupinus truncatus	/	16
	r	78		*smooth cat's ear	Hypochaeris glabra	/	21
	r	79		birch-leaf mountain-mahogany	Cercocarpus betuloides var. betuloides	/	14
	r	80		annual sunflower	Helianthus annuus	/	8
	r	81	sp	*planted 3 needle (Jeffrey?) pine	Pinus sp.⁺	/
	r	82		*Valley oak	Quercus lobata⁺	/ 1	1
	r			Large drain on ridgeline.
	r	83		*black locust	Robinia pseudoacacia⁺	/ 1	6
0.43				Cross drainage
	l			Best field of Coulter's lupine, Lupinus sparsiflorus.
	r			Road drain.
	l	84		pygmy-weed	Crassula connata	/	11
	r			Turnout.
	r	85		Acton's encelia	Encelia actoni	/	1
	r			Road drain.
	r			Turnout.
	r	86		*Australian pine	Casuarina equisetifolia⁺	/	1
	r			Sign with Bicycle Rules
	l	87		black sage	Salvia mellifera	/	29
	r			Road drain.
	r	88		*California burclover	Medicago polymorpha	/	26
	l			(Giant needlegrass, Achnatherum coronatum)
	l	89		white nightshade	Solanum douglasii	/	12
				Cross weird drainage.
	l	90		red-gland spurge	Chamaesyce melanadenia	/	8
	r	91		stinging lupine	Lupinus hirsutissimus	/	11
	r			Small drain.
	l	92		*fountain grass	Pennisetum setaceum	/	8
0.62				Cross drainage with interesting alcove / dry waterfall on left.
	l	93		hollyleaf redberry	Rhamnus ilicifolia	/	31
0.85				Cross large drainage with a flat-topped low retaining wall, good for sitting on.
	l	94		bittercress	Cardamine oligosperma	/	5
	l	95		threadstem	Pterostegia drymarioides	/	14
	l	96		narrow-leaved miner's lettuce	Claytonia parviflora ssp. parviflora	/	8
	l	97		miner's lettuce	Claytonia perfoliata ssp. perfoliata	/	12
	l	98		hollyleaf cherry	Prunus ilicifolia ssp. ilicifolia	/	9
	l	99		heartleaf penstemon	Keckiella cordifolia	/	19
	r	100		poison oak	Toxicodendron diversilobum	/	29
	r	101		toyon	Heteromeles arbutifolia	/	35
	l	102		goldback fern	Pentagramma triangularis ssp. triangularis	/	12
	l	103		California lace fern	Aspidotis californica	/	4
	l	104		woolly Indian paintbrush	Castilleja foliolosa	/	1
0.98	r			Jct. Horse Trail down to lower Eaton Canyon; take it; elevation 1635 feet.
	l	105		south coast morning-glory	Calystegia macrostegia ssp. intermedia	/	12
	l	106		sugar bush	Rhus ovata	/	19
	r	107	?	the unknown ~agave mystery plant from sunset ridge
	l			Firecracker Plantation, where the 1993 fire was started by a transient.
	l			(Unk. pine tree, not P. halapensis)
	r	108		*olive	Olea europaea	/	8
	r	109		saw-toothed goldenbush	Hazardia squarrosa var. grindelioides	/	26
	l	110		Bigelow's coreopsis	Coreopsis bigelovii	/	1
	r	111		San Gabriel Mtns. leather oak	Quercus durata var. gabrielensis	/	3
	b	112		chamise	Adenostoma fasciculatum	/	27
	r	113		*Russian thistle	Salsola tragus	/	22
	r	114		bristly goldenaster	Heterotheca sessiliflora ssp. echioides	/	5
	r			(blue elderberry, Sambucus mexicana)
	l	115	?	Helianthus gracilentus?
	l	116		Engelmann leather oak hybrid	Quercus durata var. gabrielensis X Q. engelmannii	/	2
	r	117		blue elderberry	Sambucus mexicana	/	34
	r			(Check for possible Quercus durata X Q. berberidifolia.)
	l	118		Southern California black walnut	Juglans californica var. californica	/	3
	l	119		*blue gum	Eucalyptus globulus	/	4
	r	120		California coffeeberry	Rhamnus californica ssp. californica	/	12
1.49				End guide at jct. with Main Eaton Canyon Road; elevation 1080 feet.

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Flora of Lower Eaton Canyon
Plants of Southern California: Trail Guides

Copyright © 2003-2006 by Jane Strong and Tom Chester.
Permission is freely granted to reproduce any or all of this page as long as credit is given to us at this source:
http://tchester.org/sgm/plants/guides/mw_toll_road_loop.html
Comments and feedback: Jane Strong | Tom Chester
Updated 25 February 2006.