Plant Guide to San Antonio Falls Road, Manker Flat to Baldy Notch

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

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


This is a very incomplete plant trail guide made from a single walk in August 2004. Some of the identifications were made from dead plant specimens.

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. We had 79 trails in our database when this histogram was made; two trails are in this area of the San Gabriel Mountains, and an additional 7 trails in the Mt. Baden-Powell and Blue Ridge Summit area to the north. A number of "1" means the taxon has only been found on this trail among the trails in our database; numbers of "9" or smaller may indicate taxa found only in this area and the area to the north.

Number of Trails
Containing A Taxon
Number Of Taxa
On This Trail
% of Taxa
On This Trail
Total Taxa55100%

We found 13 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 do not have any number given 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"

On 8/19/04, only the first 2.29 miles of the road was surveyed.

We thank Michael Charters for several additions, revisions and verifications from his field work on 8/22/04.

Botanical Trip Reports

See also trip reports from Baldy Notch to Mt. Baldy

The Plant Guide

Version for printing, without lines and other text on this page (4 pages)

Mile#Sid?Common NameLatin Name#here#all
0.00   Beginning of San Antonio Falls Road at junction with Mt. Baldy Road; elevation ~6160 feet (1880 m).
0.00l1 bigcone-sprucePseudotsuga macrocarpa99 / 95
0.00b2 incense-cedarCalocedrus decurrens / 12
0.00r  (chaparral yucca, Yucca whipplei; and leafy common rabbitbrush, Chrysothamnus nauseosus ssp. consimilis.)
0.00l  Two porta-potties.
0.00l3 bigleaf mapleAcer macrophyllum1 / 17
0.00l4sspwestern vervainVerbena lasiostachys var. lasiostachys10 / 23
0.00l5 California brickellbushBrickellia californica / 26
0.01l6?cherry sp.?Prunus sp.?+1 / 1 
0.01l7 *white sweetcloverMelilotus albus30 / 47
0.01l8 California fuchsiaEpilobium canum99 / 912
0.01l9 leafy common rabbitbrushChrysothamnus nauseosus ssp. consimilis20 / 42
0.01r10 *shortpod mustardHirschfeldia incana5 / 241
0.01r11 canyon live oakQuercus chrysolepis / 20
0.01r  Sign: "Fire restrictions ..."
0.01r12?unk like Russian thistle x bird's beak.11
0.01r13 California buckwheatEriogonum fasciculatum var. polifolium30 / 514
0.01r14 *downy bromeBromus tectorum99 / 921
0.02l15 giant blazing starMentzelia laevicaulis99 / 96
0.03   Gate with hiker opening on right.
0.03r16 naked-stem bedstrawGalium angustifolium ssp. nudicaule1 / 13
0.04r17 arroyo willowSalix lasiolepis10 / 229
0.04r18 chaparral yuccaYucca whipplei / 25
0.04r  (curl-leaf mountain-mahogany, Cercocarpus ledifolius var. intermontanus)
0.05r19 Sierra hoary coffeeberryRhamnus tomentella ssp. cuspidata10 / 91
0.05r20 Fremont cottonwoodPopulus fremontii ssp. fremontii3 / 18
0.06r21?unk grass - 1101
0.06r22?unk grass - 2101
0.06r23 willowherbEpilobium ciliatum ssp. ciliatum5 / 117
0.06r24~California bromeBromus carinatus var. carinatus99 / 915
0.06r25 naked buckwheatEriogonum nudum var. pauciflorum+99 / 97
0.06r26 smoothleaf yerba santaEriodictyon trichocalyx var. trichocalyx / 8
0.06r27 fragrant everlastingGnaphalium canescens ssp. beneolens2 / 24
0.07r28 Grinnell's beardtonguePenstemon grinnellii var. grinnellii10 / 915
0.08l  Cabin with address 8294-35.
0.09r  Jct. steep path.
0.09l29 short-leaved squirreltailElymus elymoides ssp. brevifolius30 / 93
0.09l30 western wallflowerErysimum capitatum ssp. capitatum30 / 916
0.10l31 clasping-leaved caulanthusCaulanthus amplexicaulis var. amplexicaulis4 / 22
0.10l32 Davidson's buckwheatEriogonum davidsonii99 / 918
0.10l33?like Elymus glaucus or Leymus triticoides.
0.10l34 leafy daisyErigeron foliosus var. foliosus / 34
0.14r35?southern Sierra phacelia? long-stalk phacelia?Phacelia austromontana? P. longipes?10 / 2 
0.21l36 *ripgut bromeBromus diandrus1 / 140
0.23l37 California-asterLessingia filaginifolia var. filaginifolia20 / 942
0.23r38 bush monkeyflowerMimulus aurantiacus20 / 435
0.23l39?arched elegant rock-cress?Arabis sparsiflora var. arcuata?+10 / 2 
0.26   Road curves right 90°.
0.27r40 golden yarrowEriophyllum confertiflorum var. confertiflorum20 / 947
0.28r41?unk Asteraceae
0.28r42spFremont's goosefoot?Chenopodium fremontii?3 / 2 
0.28l43?dead plant similar to tarragon.11
0.29r44~*common wheatTriticum aestivum5 / 23
0.37r sp(Penstemon sp., probably P. rostriflorus or P. labrosus)
0.39r45?Bigelow's spike-moss?Selaginella bigelovii?1 / 1 
0.40r  (rock goldenbush, Ericameria cuneata var. cuneata)
0.42r46 chicory-leaved stephanomeriaStephanomeria cichoriacea10 / 96
0.43l  Jct. driveway going downhill.
0.43l47 curl-leaf mountain-mahoganyCercocarpus ledifolius var. intermontanus / 10
0.48   Jct. driveway going downhill.
0.50r48 California coffeeberryRhamnus californica ssp. californica / 13
0.50l  Jct. driveway.
0.51r49 white firAbies concolor / 20
0.53   Road switchbacks right at viewpoint for San Antonio Falls; elevation 6424 feet (1958 m).
0.60l  (hollyleaf redberry, Rhamnus ilicifolia)
0.72r50 Jeffrey pinePinus jeffreyi / 21
0.72l51 scarlet monkeyflowerMimulus cardinalis+10 / 29
0.79   Road curves left 90°.
0.88l  Jct. unmarked Ski Hut Trail.
1.05r52 sugar pinePinus lambertiana / 12
1.11   Road curves left.
1.31l53 granite prickly phloxLeptodactylon pungens1 / 15
1.34l54?small-flowered melica?Melica imperfecta?1 / 1 
1.36l55 Parish's needlegrassAchnatherum parishii2 / 16
1.46   Road curves right at drainage; a spring is just above the road.
1.46l56 *Jerusalem oakChenopodium botrys5 / 14
1.47l57 prickly poppyArgemone munita1 / 16
1.60   Cross Manker Canyon Creek; switchback right.
1.60r58~virgin's bowerClematis ligusticifolia1 / 19
1.63l59 Wright's buckwheatEriogonum wrightii var. subscaposum1 / 113
1.63l60 fir mistletoePhoradendron pauciflorum1 / 110
1.70l  Other location for the possible arched elegant rock-cress, Arabis sparsiflora var. arcuata.
1.74   Switchback left at ridge.
1.92   Switchback left at ridge.
2.03l  Concrete block cutout / slope reinforcement
2.04l  Sign: "Caution - Telephone Cable"
2.06r61 Nevin's bird's beakCordylanthus nevinii20 / 47
2.12l  Concrete block cutout / slope reinforcement
2.19l62 green-leaf manzanitaArctostaphylos patula1 / 112
2.20l63 rock buckwheatEriogonum saxatile1 / 19
2.22l  Concrete block cutout / slope reinforcement
2.24l64 Johnston's monkeyflowerMimulus johnstonii5 / 12
2.26l65 snow-plantSarcodes sanguinea1 / 14
2.28b66 goldenrodSolidago californica5 / 127
2.29b67 white alderAlnus rhombifolia3 / 110
2.29l  positive id for scarlet monkeyflower, Mimulus cardinalis.
2.29l68spsedgeCarex sp.2 / 1 
2.29r  (Bigelow's sneezeweed, Helenium bigelovii)
2.29   Switchback right; elevation ~7220 feet (2200 m). A spring is just above the road, but its water has been stolen in the visible pipe. The alder is now left high and dry.
2.30   End plant guide; the remainder of this guide just lists landmarks.
2.39   Switchback left at ski lift.
2.50   Road curves left 90°.
2.59   Switchback right; elevation 7400 feet (2255 m).
2.75   Long switchback left at ridge.
2.83   Switchback right at drainage
2.84   Cross under ski lift.
3.01   Long switchback left just above Miner's Bowl.
3.28   End road at top of ski lift; elevation 7760 feet (2365 m).

Comments On Specific Species

Prunus sp.?. If this is a native plant, it keys to Prunus virginiana var. demissa, using the leaf and stem key in Dole and Rose. However, it is possible that this is a planted specimen, in which case the keying is not definitive. Although the leaf is very close to this taxon, the teeth are not quite right. Also, we have never found a single specimen of this taxon; it always occurs in large numbers. Hence we suspect it is planted.

Eriogonum nudum var. pauciflorum. Some plants have yellow flowers, in addition to plants with the normal white flowers. We see this behavior on other trails as well. Bright yellow flowers are a characteristic of var. westonii, which also have leaves tomentose above, and 1-4 involucres per node. However, in the San Gabriel Mountains, var. westonii is only found in the western portion of the range.

Arabis sparsiflora var. arcuata?. The first specimens on the trail had only basal leaves. It is possible that these are the same as specimens at mile 1.70, so the specimens at mile 1.70 have not been numbered as a new taxon. The fruit is consistent with this id, but we need fresh leaves and flowers to confirm it.

Mimulus cardinalis. The first occurrence of this taxon is in what seems to be a dry area, which seems a very improbable location for this species. However, the plants in fruit there look identical to the plants with flowers and fruit at mile 2.29.

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Copyright © 2004 by Tom Chester and Cliff McLean.
Permission is freely granted to reproduce any or all of this page as long as credit is given to us at this source:
Comments and feedback: Tom Chester | Cliff McLean
Updated 21 August 2004.