Taxon Report

Escobaria alversonii (J.M. Coult.) N.P. Taylor

Alverson's foxtail cactus

Print Report

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

Ecology and Life History


Lifeform:	perennial stem
Blooming Period: Apr-Jun(Sep-Oct)	Apr-Jun(Sep-Oct)
Elevation:	75-1525 (245-5005)
General Habitats:	Mojavean desert scrub, Sonoran desert scrub
Microhabitat:	Granitic (usually), Rocky (sometimes), Sandy (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	55
Element Occurrence Ranks:
Excellent (A)	5
Good (B)	5
Fair (C)	6
Poor (D)	0
None (X)	0
Unknown (U)	39

Location


California Endemic: True
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)

Threat List Data from the CNDDB


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

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:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 26 December 2024].