CNPS Inventory Plant Detail

Cirsium hydrophilum var. vaseyi

Common Name:	Mt. Tamalpais thistle
Family:	Asteraceae
Synonyms:
Element Code:	PDAST2E1G2
Full Name:	Cirsium hydrophilum (Greene) Jeps. var. vaseyi (Gray) J.T. Howell
USDA PLANTS Symbol:	CIHYV

Biology
Lifeform: perennial herb Blooming Period: May - August Habitat: serpentinite seeps. • Broadleafed upland forest • Chaparral • Meadows and seeps

Rarity Status
CA Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2 S2: Imperiled. Global Rank: G2T2 T2: Imperiled. G2: (species) Imperiled.

Occurrence Data from DFG
California Natural Diversity Database

Historic >20 yrs	Recent <=20 yrs
9	3

Presence:

Present Extant	Possibly Extirpated	Extirpated
12	0	0

Notes
Known from fewer than 20 occurrences on Mt. Tamalpais. Threatened by road construction and non-native plants. See Synoptical Flora of North America 1(2):403-404 (1884) for original description. To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page. Date Added: 1974-01-01 Last Update: 2010-03-15

Location

Elevation: 240 - 620 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Marin (MRN)

Quads: name (DWR code) USGS code
San Rafael (467A) 37122H5, Bolinas (467B) 37122H6, San Geronimo (484C) 38122A6

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

486

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Game: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-122.625,37.875