Plant Guide to Lower Arroyo Seco Mitigated Area, Pasadena

Mile	#	S	id?	Common Name	Latin 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.
0.00	1	r		western sycamore	Platanus racemosa	50 / 9	10
0.00	2	r		*sow thistle	Sonchus oleraceus	50 / 3	9
0.00	3	r		*London rocket	Sisymbrium irio	99 / 9	2
0.00	4			*pineapple weed	Chamomilla suaveolens	40 / 4
0.00	5	r		*Australian brass-buttons	Cotula australis	50 / 2	2
0.00	6	r		*California burclover	Medicago polymorpha	99 / 9	9
0.00	7	r		*ditch beard grass	Polypogon interruptus	99 / 9	1
0.00	8	r		horseweed	Conyza canadensis	99 / 9
0.00	9	r		*redstem filaree	Erodium cicutarium	99 / 9	14
0.00	10	r	sp	*cheeseweed	Malva parviflora	99 / 9	3
0.00	11	r	?	unk asteraceae
0.00	12	r		black willow	Salix gooddingii	1 / 1	5
0.00		r		Culvert
0.00	13	r		*prickly lettuce	Lactuca serriola	20 / 9
0.00	14	r		coast live oak	Quercus agrifolia var. agrifolia	10 / 5	17
0.00	15	r		California coffeeberry	Rhamnus californica ssp. californica	50 / 9	7
0.00	16	r		blue elderberry	Sambucus mexicana	20 / 5	19
0.00		r		Take path to right of main road, to be close to stream.
0.00	17	r		*shortpod mustard	Hirschfeldia incana	99 / 9	20
0.01	18	r		*Mexican tea	Chenopodium ambrosioides	10 / 2	6
0.01	19	r	~	*tumble pigweed	Amaranthus albus	/	2
0.01	20	r		bittercress	Cardamine oligosperma	/	3
0.01	21	r		*common cudweed	Gnaphalium luteo-album	/
0.01	22	r		small-flowered evening-primrose	Camissonia micrantha	99 / 9	2
0.01	23	r	~	annual sunflower	Helianthus annuus	3 / 1	4
0.01	24	r		toyon	Heteromeles arbutifolia	5 / 5	20
0.01	25	r		California wild rose	Rosa californica	/	5
0.01		r		(broadleaf cattail, Typha latifolia)
0.01	26	b		bur-ragweed	Ambrosia acanthicarpa	99 / 2	5
0.01	27	r		sacred datura	Datura wrightii+	10 / 2	8
0.02	28	r		mule fat	Baccharis salicifolia	30 / 9	17
0.02	29	b		California poppy	Eschscholzia californica	/	9
0.02	30	r		*white goosefoot	Chenopodium album	10 / 1	7
0.02		l		(North end of bathrooms)
0.02	31	r		red willow	Salix laevigata	1 / 1	8
0.03				Path curves right between an elderberry and a mule fat.
0.03	32	r		white alder	Alnus rhombifolia	30 / 9	4
0.04	33	r	~	*curly dock	Rumex crispus	99 / 5	9
0.04	34	r		willowherb	Epilobium ciliatum ssp. ciliatum	99 / 1	5
0.04	35	r		narrowleaf willow	Salix exigua	5 / 3	5
0.04	36	r		golden currant	Ribes aureum var. gracillimum	10 / 5	1
0.04		l		(unknown woody shrub, big thing, ferny leaves, multiple stems)
0.05	37	l		sugar lemonade berry	Rhus integrifolia X R. ovata	1 / 1	1
0.05	38	r	sp	pampas grass	Cortaderia sp.	/
0.06	39	r		arroyo willow	Salix lasiolepis	20 / 9	17
0.07	40	r		shining willow	Salix lucida ssp. lasiandra	2 / 2	1
0.07	41	r		umbrella sedge	Cyperus eragrostis	/	1
0.07	42	r		broadleaf cattail	Typha latifolia	99 / 9	1
0.08	43	l		*black locust	Robinia pseudoacacia	5 / 1	4
0.08	44	r		short-leaved cliff-aster	Malacothrix saxatilis var. tenuifolia	2 / 2	4
0.08		l		End of casting pond.
0.08	45	r		common bedstraw	Galium aparine	10 / 2	5
0.09	46	r		water cress	Rorippa nasturtium-aquaticum	99 / 3	3
0.10	47	r		black cottonwood	Populus balsamifera ssp. trichocarpa	20 / 9	7
0.10	48	b		*common chickweed	Stellaria media	99 / 3	4
0.11	49	r		*camphor tree	Cinnamomum camphora	1 / 1	1
0.11	50	l		*horehound	Marrubium vulgare	10 / 2	11
0.12	51	r		California blackberry	Rubus ursinus	20 / 5	7
0.12	52	r		wild-cucumber	Marah macrocarpus var. macrocarpus	2 / 2	13
0.12		r		(11 leaflet ash, Fraxinus sp.; eupatory, Ageratina adenophora)
0.14	53	l		*bull thistle	Cirsium vulgare	1 / 1	6
0.14	54	l		southern honeysuckle	Lonicera subspicata var. denudata	10 / 5	17
0.14	55	l		hollyleaf cherry	Prunus ilicifolia ssp. ilicifolia	5 / 4	5
0.14	56	r	sp	11 leaflet ash	Fraxinus sp.	2 / 2
0.14	57	l		laurel sumac	Malosma laurina	1 / 1	16
0.14	58	l		poison oak	Toxicodendron diversilobum	5 / 1	16
0.15	59	r		*eupatory	Ageratina adenophora	99 / 2	3
0.16	60	r		Fremont cottonwood	Populus fremontii ssp. fremontii	1 / 1	7
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.
0.18	61	l	sp	miner's lettuce	Claytonia perfoliata	1 / 1	4
0.18	62	l	sp	oak	Quercus sp., lvs similar to Q. ilex, Q. tomentella, or Q. chrysolepis	1 / 1
0.19	63	l		California bay	Umbellularia californica	1 / 1	4
0.19	64	l		hollyleaf redberry	Rhamnus ilicifolia	3 / 3	18
0.20	65	r		*olive	Olea europaea	10 / 2	3
0.20		l		(black sage, Salvia mellifera)
0.20	66	r		California buckwheat	Eriogonum fasciculatum var. foliolosum	30 / 3	21
0.20		b		(white sage, Salvia apiana)
0.20		r		(California encelia, Encelia californica)
0.20	67	l		collar lupine	Lupinus truncatus	2 / 1	6
0.20	68	l		arroyo lupine	Lupinus succulentus	5 / 5	1
0.20	69	l		purple clarkia	Clarkia purpurea ssp. quadrivulnera	99 / 9
0.20		r		(California sagebrush, Artemisia californica)
0.21	70	l		*shepherd's purse	Capsella bursa-pastoris	99 / 5	2
0.21				Trail forks; take left branch; we'll return using the right branch.
0.22	71	l	sp	Schismus sp.	Schismus sp.	/
0.22		l	~	California suncup	Camissonia californica+	99 / 9	5
0.22	72	l		California sagebrush	Artemisia californica	20 / 3	20
0.23	73	r		mugwort	Artemisia douglasiana	20 / 5	14
0.23	74	r		*bur chervil	Anthriscus caucalis	99 / 2	3
0.23	75	r	~	white nightshade	Solanum douglasii	1 / 1	6
0.23	76	r		Coulter's lupine	Lupinus sparsiflorus	/	1
0.23	77	r		California croton	Croton californicus	5 / 2	4
0.23	78	r		black sage	Salvia mellifera	20 / 3	18
0.23		r		Jct. shortcut trail between the two branches.
0.23	79	b		California encelia	Encelia californica	20 / 3	7
0.23	80	b		white sage	Salvia apiana	20 / 3	15
0.48	81	r	?	popcorn flower?	Plagiobothrys sp.?	/
0.23	82	l	?	smooth cat's ear?
0.23	83	l		wild canterbury bells	Phacelia minor	/
0.24	84	r		stinging lupine	Lupinus hirsutissimus	3 / 1	4
0.24		l		Sprinkler head at end of white pipe.
	85	r		elegant clarkia	Clarkia unguiculata	/
0.29	86	r		giant wild rye	Leymus condensatus	20 / 2	12
0.29	87	l	~	American elm	Ulmus americana	1 / 1
0.29	88	l		Southern California black walnut	Juglans californica var. californica	5 / 1	1
0.30	89	l		*henbit	Lamium amplexicaule	5 / 1	3
0.30	90	l		big saltbush	Atriplex lentiformis ssp. torreyi	1 / 1	1
0.30	91	l		deer brush	Ceanothus integerrimus	3 / 3	4
0.30	92	l		Engelmann oak	Quercus engelmannii	5 / 5	10
0.31	93	r		coyote bush	Baccharis pilularis	2 / 2	12
0.31		r		"Bird-watching" bench
0.34				Jct. with signed Horseback Riding and Hiking Trail; go right on it.
0.35	94	l		*greater periwinkle	Vinca major	5 / 1	4
0.35		l		Short old white post with letters "SO". Anyone know what that stands for?
0.36	95	l		greenbark ceanothus	Ceanothus spinosus	2 / 1	1
0.37	96	r		branching phacelia	Phacelia ramosissima var. latifolia	3 / 1	6
0.37	97	l		*Canary Island pine	Pinus canariensis	5 / 1	1
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.
0.46	98	r		*Russian thistle	Salsola tragus	3 / 1	15
0.48				Y junction; take right branch.
0.49	99	r	ssp	deerweed	Lotus scoparius	5 / 1	7
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?
0.68	100	r		fuchsia-flowered gooseberry	Ribes speciosum	1 / 1	1
0.75				Dense vegetation forces us to join main path alongside concrete channel.
0.79	101	r		California chicory	Rafinesquia californica	1 / 1	3
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 filago	Filago californica	/
	103			*little horseweed	Conyza bonariensis	/
	104			*bristly ox-tongue	Picris echioides	/
	105		~	cotton-batting plant	Gnaphalium stramineum	/
	106		~	purple everlasting	Gnaphalium purpureum	/
	107			Bishop's lotus	Lotus strigosus	/
	108			strigose sun-cup	Camissonia strigulosa	/
	109			chia	Salvia columbariae	/
	110		sp	peppergrass 1	Lepidium sp.	/
	111		sp	peppergrass 2	Lepidium sp.	/
	112		sp	cultivated verbena	Verbena sp.	/
	113			*lesser swine cress	Coronopus didymus	/
	114		sp	grape

http://tchester.org/sgm/plants/guides/lower_arroyo_seco.html
Updated 27 November 2003.