Species Details

Escobaria alversonii

Alverson's foxtail cactus

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Classification

Scientific Name: Escobaria alversonii (J.M. Coult.) N.P. Taylor
Common Name: Alverson's foxtail cactus
Family:	Cactaceae
Element Code:	PDCAC0X060
USDA Plants Symbol:
Synonyms/Other Names: Escobaria vivipara (Nutt.) F. Buxb. var. alversonii (Coult.) D. Hunt Coryphantha alversonii (J.M. Coult.) Orcutt

Conservation Status

CA Rare Plant Rank:	4.3
Fed List:	None
State List:	None
Global Rank:	G3
State Rank:	S3
Other Status:
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2024-03-06

Ecology and Life History

Lifeform: perennial stem

Blooming Period: Apr-Jun(Sep-Oct)

Elevation:
75 - 1525 meters
245 - 5005 feet

General Habitats:

Mojavean desert scrub
Sonoran desert scrub

Microhabitat Details:

Microhabitat:

Granitic (usually)
Rocky (sometimes)
Sandy (sometimes)

Notes

Notes: Collection from AZ misidentified. Surveys in 2022 and 2023 indicated that some occurrences in the Big Maria Mountains may be in decline.
Threats: Possibly threatened by horticultural collecting, vehicles, and recreational activities.
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	6
	Total EOs	% of EOs
EOs with Threat Listed:	36	65 %
Road/trail construction/maint.	25	45%
Landfill	17	30%
Other	11	20%
Mining	10	18%
Military operations	3	5%
Development	1	1%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					55
A	B	C	D	X	U
5	5	6	0	0	39

Occurrence Status:
Historical >20 Years	55
Recent <=20 Years	0

Presence:
Presumed Extant	55
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

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

Quads: Name (Quad Code)
Ash Hill (3411661), Big Maria Mts. NE (3311485), Big Maria Mts. NW (3311486), Big Maria Mts. SW (3311476), Big Maria Mts.SE (3311475), Blythe NE (3311465), Bristol Lake NW (3411546), Bristol Lake SW (3411536), Buzzard Spring (3311575), Cadiz Valley SE (3411513), Cadiz Valley SW (3411514), Clarks Pass (3411515), Cleghorn Lakes (3411537), Corn Spring (3311563), Cottonwood Basin (3311568), Cottonwood Spring (3311567), Dale Lake (3411526), Deadman Lake NE (3411641), Deadman Lake NW (3411642), Deadman Lake SE (3411631), Desert Center (3311564), East of Red Canyon (3311555), Hayfield (3311566), Hayfield Spring (3311565), Hector (3411674), Inca (3311477), Lead Mountain (3411548), Lead Mountain SW (3411538), Lead Mtn. NE (3411547), Little Maria Mts. (3311488), Ludlow (3411662), Ludlow SE (3411651), Malapai Hill (3311681), McCoy Wash (3311466), Mescal Range (3511545), Morgans Well (3411652), Palen Pass (3311581), Parker SW (3411414), Pilot Mountain (3311553), Pinto Wells (3311584), Poston (3311484), Queen Mtn. (3411611), Red Cloud Canyon (3311554), Sleeping Beauty (3411673), Styx (3311487), Twentynine Palms (3411621), Twentynine Palms Mtn. (3411518), Victory Pass (3311574), Vidal (3411415), West of Broadwell Mesa (3411682), West of Palen Pass (3311582), Whipple Wash (3411433)

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