Species Details

Euphorbia exstipulata var. exstipulata

Clark Mountain spurge

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Classification

Scientific Name: Euphorbia exstipulata Engelm. var. exstipulata
Common Name: Clark Mountain spurge
Family:	Euphorbiaceae
Element Code:	PDEUP0Q0P1
USDA Plants Symbol:
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	2B.1
Fed List:	None
State List:	None
Global Rank:	G5T5?
State Rank:	S2
Other Status:	SB_CalBG/RSABG
CRPR Changes: changed from 2.1 to 2B.1 on 2013-06-12
Add Date:	1988-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: annual herb

Blooming Period: Sep

Elevation:
1280 - 2000 meters
4200 - 6560 feet

General Habitats:

Mojavean desert scrub (rocky)

Microhabitat Details:

Microhabitat:

Notes

Notes: Known in CA only from Clark Mtn. Threatened by mining.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	4	40 %
Mining	4	40%
ORV activity	3	30%
Vandalism/dumping/litter	2	20%
Non-native animal impacts	1	10%
Development	1	10%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					10
A	B	C	D	X	U
0	2	0	0	0	8

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	9

Presence:
Presumed Extant	10
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Arizona (AZ), California (CA), New Mexico (NM), Oklahoma (OK), Texas (TX), Utah (UT), Wyoming (WY)

California Counties and Islands: Name (Code)
San Bernardino (SBD)

Quads: Name (Quad Code)
Castle Peaks (3511532), Clark Mtn. (3511555), Hart Peak (3511531), Ivanpah (3511533), Mescal Range (3511545), Mineral Hill (3511544), Pinto Valley (3511523)

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