Species Details

Cirsium occidentale var. lucianum

Cuesta Ridge thistle

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Classification

Scientific Name: Cirsium occidentale (Nutt.) Jeps. var. lucianum D.J. Keil
Common Name: Cuesta Ridge thistle
Family:	Asteraceae
Element Code:	PDAST2E1Z6
USDA Plants Symbol:
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G3G4T2
State Rank:	S2
Other Status:	BLM_S
CRPR Changes: added to 1B.2 on 2011-04-08
Add Date:	2011-04-08
Date Edited:	2024-11-05

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Apr-Jun

Elevation:
500 - 750 meters
1640 - 2460 feet

General Habitats:

Chaparral (openings)

Microhabitat Details:

Microhabitat:

Disturbed areas
Roadsides
Rocky (often)
Serpentine
Slopes (often)

Notes

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.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	2	20 %
Improper burning regime	2	20%
ORV activity	1	10%
Recreational use (non-ORV)	1	10%
Road/trail construction/maint.	1	10%
Vandalism/dumping/litter	1	10%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					10
A	B	C	D	X	U
0	0	0	0	0	10

Occurrence Status:
Historical >20 Years	4
Recent <=20 Years	6

Presence:
Presumed Extant	10
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
San Luis Obispo (SLO)

Quads: Name (Quad Code)
Atascadero (3512046), Lopez Mtn. (3512035), Morro Bay North (3512047), San Luis Obispo (3512036), Santa Margarita Lake (3512034)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory