Plant Guide to Lower Arroyo Seco Mitigated Area, Pasadena

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

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. We had 38 trails in our database when this histogram was made. A number of "1" means the taxon has only been found on this trail among the trails in our database. (Table not updated for 5/5/03 version.)

Number of Trails
Containing A Taxon
Number Of Taxa
On This Trail
% of Taxa
On This Trail
11517%
267%
389%
41112%
589%
656%
778%
822%
944%
1022%
1111%
1233%
1311%
1422%
1522%
1622%
1744%
1822%
1911%
2033%
2111%
Total Taxa90100%

We found 12 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.

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"
12/28/2002193161274
1/3/2003297118111
1/6/2003397107111
1/9/2003410297111
1/14/2003510287111
5/5/2003611531081

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 this guide at east path, immediately west of the bathrooms and casting pond, where the mitigation stream begins by flowing out of the culvert. This guide will stay as close to the stream as possible.
0.001r western sycamorePlatanus racemosa50 / 910
0.002r *sow thistleSonchus oleraceus50 / 39
0.003r *London rocketSisymbrium irio99 / 92
0.004  *pineapple weedChamomilla suaveolens40 / 4 
0.005r *Australian brass-buttonsCotula australis50 / 22
0.006r *California burcloverMedicago polymorpha99 / 99
0.007r *ditch beard grassPolypogon interruptus99 / 91
0.008r horseweedConyza canadensis99 / 9 
0.009r *redstem filareeErodium cicutarium99 / 914
0.0010rsp*cheeseweedMalva parviflora99 / 93
0.0011r?unk asteraceae
0.0012r black willowSalix gooddingii1 / 15
0.00 r Culvert
0.0013r *prickly lettuceLactuca serriola20 / 9 
0.0014r coast live oakQuercus agrifolia var. agrifolia10 / 517
0.0015r California coffeeberryRhamnus californica ssp. californica50 / 97
0.0016r blue elderberrySambucus mexicana20 / 519
0.00 r Take path to right of main road, to be close to stream.
0.0017r *shortpod mustardHirschfeldia incana99 / 920
0.0118r *Mexican teaChenopodium ambrosioides10 / 26
0.0119r~*tumble pigweedAmaranthus albus / 2
0.0120r bittercressCardamine oligosperma / 3
0.0121r *common cudweedGnaphalium luteo-album /  
0.0122r small-flowered evening-primroseCamissonia micrantha99 / 92
0.0123r~annual sunflowerHelianthus annuus3 / 14
0.0124r toyonHeteromeles arbutifolia5 / 520
0.0125r California wild roseRosa californica / 5
0.01 r (broadleaf cattail, Typha latifolia)
0.0126b bur-ragweedAmbrosia acanthicarpa99 / 25
0.0127r sacred daturaDatura wrightii+10 / 28
0.0228r mule fatBaccharis salicifolia30 / 917
0.0229b California poppyEschscholzia californica / 9
0.0230r *white goosefootChenopodium album10 / 17
0.02 l (North end of bathrooms)
0.0231r red willowSalix laevigata1 / 18
0.03   Path curves right between an elderberry and a mule fat.
0.0332r white alderAlnus rhombifolia30 / 94
0.0433r~*curly dockRumex crispus99 / 59
0.0434r willowherbEpilobium ciliatum ssp. ciliatum99 / 15
0.0435r narrowleaf willowSalix exigua5 / 35
0.0436r golden currantRibes aureum var. gracillimum10 / 51
0.04 l (unknown woody shrub, big thing, ferny leaves, multiple stems)
0.0537l sugar lemonade berryRhus integrifolia X R. ovata1 / 11
0.0538rsppampas grassCortaderia sp. /  
0.0639r arroyo willowSalix lasiolepis20 / 917
0.0740r shining willowSalix lucida ssp. lasiandra2 / 21
0.0741r umbrella sedgeCyperus eragrostis / 1
0.0742r broadleaf cattailTypha latifolia99 / 91
0.0843l *black locustRobinia pseudoacacia5 / 14
0.0844r short-leaved cliff-asterMalacothrix saxatilis var. tenuifolia2 / 24
0.08 l End of casting pond.
0.0845r common bedstrawGalium aparine10 / 25
0.0946r water cressRorippa nasturtium-aquaticum99 / 33
0.1047r black cottonwoodPopulus balsamifera ssp. trichocarpa20 / 97
0.1048b *common chickweedStellaria media99 / 34
0.1149r *camphor treeCinnamomum camphora1 / 11
0.1150l *horehoundMarrubium vulgare10 / 211
0.1251r California blackberryRubus ursinus20 / 57
0.1252r wild-cucumberMarah macrocarpus var. macrocarpus2 / 213
0.12 r (11 leaflet ash, Fraxinus sp.; eupatory, Ageratina adenophora)
0.1453l *bull thistleCirsium vulgare1 / 16
0.1454l southern honeysuckleLonicera subspicata var. denudata10 / 517
0.1455l hollyleaf cherryPrunus ilicifolia ssp. ilicifolia5 / 45
0.1456rsp11 leaflet ashFraxinus sp.2 / 2 
0.1457l laurel sumacMalosma laurina1 / 116
0.1458l poison oakToxicodendron diversilobum5 / 116
0.1559r *eupatoryAgeratina adenophora99 / 23
0.1660r Fremont cottonwoodPopulus fremontii ssp. fremontii1 / 17
0.17 r End of stream, with water going into culvert draining into the concrete Arroyo Seco channel.
0.18 l Drainage from east bank.
0.1861lspminer's lettuceClaytonia perfoliata1 / 14
0.1862lspoakQuercus sp., lvs similar to Q. ilex, Q. tomentella, or Q. chrysolepis1 / 1 
0.1963l California bayUmbellularia californica1 / 14
0.1964l hollyleaf redberryRhamnus ilicifolia3 / 318
0.2065r *oliveOlea europaea10 / 23
0.20 l (black sage, Salvia mellifera)
0.2066r California buckwheatEriogonum fasciculatum var. foliolosum30 / 321
0.20 b (white sage, Salvia apiana)
0.20 r (California encelia, Encelia californica)
0.2067l collar lupineLupinus truncatus2 / 16
0.2068l arroyo lupineLupinus succulentus5 / 51
0.2069l purple clarkiaClarkia purpurea ssp. quadrivulnera99 / 9 
0.20 r (California sagebrush, Artemisia californica)
0.2170l *shepherd's purseCapsella bursa-pastoris99 / 52
0.21   Trail forks; take left branch; we'll return using the right branch.
0.2271lspSchismus sp.Schismus sp. /  
0.22 l~California suncupCamissonia californica+99 / 95
0.2272l California sagebrushArtemisia californica20 / 320
    
0.2373r mugwortArtemisia douglasiana20 / 514
0.2374r *bur chervilAnthriscus caucalis99 / 23
0.2375r~white nightshadeSolanum douglasii1 / 16
0.2376r Coulter's lupineLupinus sparsiflorus / 1
0.2377r California crotonCroton californicus5 / 24
0.2378r black sageSalvia mellifera20 / 318
0.23 r Jct. shortcut trail between the two branches.
0.2379b California enceliaEncelia californica20 / 37
0.2380b white sageSalvia apiana20 / 315
0.4881r?popcorn flower?Plagiobothrys sp.? /  
0.2382l?smooth cat's ear?
0.2383l wild canterbury bellsPhacelia minor /  
0.2484r stinging lupineLupinus hirsutissimus3 / 14
0.24 l Sprinkler head at end of white pipe.
 85r elegant clarkiaClarkia unguiculata /  
0.2986r giant wild ryeLeymus condensatus20 / 212
0.2987l~American elmUlmus americana1 / 1 
0.2988l Southern California black walnutJuglans californica var. californica5 / 11
0.3089l *henbitLamium amplexicaule5 / 13
0.3090l big saltbushAtriplex lentiformis ssp. torreyi1 / 11
0.3091l deer brushCeanothus integerrimus3 / 34
0.3092l Engelmann oakQuercus engelmannii5 / 510
0.3193r coyote bushBaccharis pilularis2 / 212
0.31 r "Bird-watching" bench
0.34   Jct. with signed Horseback Riding and Hiking Trail; go right on it.
0.3594l *greater periwinkleVinca major5 / 14
0.35 l Short old white post with letters "SO". Anyone know what that stands for?
0.3695l greenbark ceanothusCeanothus spinosus2 / 11
0.3796r branching phaceliaPhacelia ramosissima var. latifolia3 / 16
0.3797l *Canary Island pinePinus canariensis5 / 11
0.37 r Bathrooms
0.38   Tin shed with pump inside on left; hitching rails on right.
0.41   Jct. with main path alongside concrete channel; go right on small path paralleling the main path.
0.44 r Emergency phone.
0.4698r *Russian thistleSalsola tragus3 / 115
0.48   Y junction; take right branch.
0.4999rsspdeerweedLotus scoparius5 / 17
0.50 r Several very old elderberries, Sambucus mexicana.
0.54 r Jct. other end of shortcut trail between the two branches.
0.56   End this loop section. Continue straight on previously-walked section.
0.58   Drainage from east bank on right; go left here to get on west side of mitigation stream.
0.59   Go right on the mulched area, staying as close to the stream as possible.
0.60 r red goosefoot, Chenopodium rubrum?
0.68100r fuchsia-flowered gooseberryRibes speciosum1 / 11
0.75   Dense vegetation forces us to join main path alongside concrete channel.
0.79101r California chicoryRafinesquia californica1 / 13
0.81   Go right at bridge over concrete channel to reach beginning of hike.
0.83 r Parking lot entrance.
0.86 r Jct. beginning of plant guide; plant guide ends.
    Need to locate the following species:
 102  California filagoFilago californica /  
 103  *little horseweedConyza bonariensis /  
 104  *bristly ox-tonguePicris echioides /  
 105 ~cotton-batting plantGnaphalium stramineum /  
 106 ~purple everlastingGnaphalium purpureum /  
 107  Bishop's lotusLotus strigosus /  
 108  strigose sun-cupCamissonia strigulosa /  
 109  chiaSalvia columbariae /  
 110 sppeppergrass 1Lepidium sp. /  
 111 sppeppergrass 2Lepidium sp. /  
 112 spcultivated verbenaVerbena sp. /  
 113  *lesser swine cressCoronopus didymus /  
 114 spgrape

Comments On Specific Species

Datura wrightii. The plant at this location is young; the id comes from mature specimens a short distance farther on the trail.

Camissonia californica. Identification confident here, but uncertain earlier. The species will be counted here only if the earlier specimen turns out to not be this identification.

Quercus sp.. Leaves are similar to Q. ilex, Q. tomentella, or Q. chrysolepis. Need an acorn to help with the identification.


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Copyright © 2002-2003 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/lower_arroyo_seco.html
Comments and feedback: Jane Strong | Tom Chester
Updated 27 November 2003.