CNPS Inventory Plant Detail

Cirsium occidentale var. lucianum

Common Name:	Cuesta Ridge thistle
Family:	Asteraceae
Synonyms:
Element Code:	PDAST2E1Z6
Full Name:	Cirsium occidentale (Nutt.) Jeps. var. lucianum D.J. Keil
USDA PLANTS Symbol:

Biology
Lifeform: perennial herb Blooming Period: April - June Habitat: Serpentinite. Often steep rocky slopes and disturbed roadsides.. • Chaparral (openings)

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: G3G4T2 T2: Imperiled. G3: (species) Vulnerable. G4: (species) Apparently secure, considering populations outside California.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 7
Element Occurrence Ranks:

A B C D X U

0 0 0 0 0 7

Population Status:

Historic >20 yrs	Recent <=20 yrs
4	3

Presence:

Present Extant	Possibly Extirpated	Extirpated
7	0	0

Notes

Known only from fewer than 10 extant occurrences in the southern Santa Lucia Mtns. Of SLO Co. Possibly threatened by fire suppression. Similar to var. californicum. Not in The Jepson Manual (1993). See Sida 21(1):207-219 (2004) 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: 2011-04-08
Last Update: 2011-07-19

Location

Elevation: 500 - 750 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
San Luis Obispo (SLO)

Quads: name (DWR code) USGS code
Santa Margarita Lake (245C) 35120C4, Atascadero (246B) 35120D6, San Luis Obispo (246C) 35120C6, Lopez Mtn. (246D) 35120C5

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

3507

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 .

-120.5,35.25