Taxon Report

Asclepias asperula (Dcne.) Woodson ssp. asperula

antelope-horns

Print Report

Taxon Summary

Asclepias asperula ssp. asperula, commonly known as antelope-horns, is a perennial herb in the Apocynaceae that is found in California and elsewhere. It occurs within Mojavean desert scrub, and Pinyon and juniper woodland, growing at elevations from 915 to 2195 meters. Asclepias asperula ssp. asperula is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Asclepias asperula (Dcne.) Woodson ssp. asperula
Common Name:	antelope-horns
Family:	Apocynaceae
Element Code:	PDASC02051
USDA Plants Symbol:	ASASA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Sep	May-Sep
Elevation:	915-2195 (3000-7200)
General Habitats:	Mojavean desert scrub, Pinyon and juniper woodland
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G5T5
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
San Bernardino (SBD)
Quads: Name (Quad Code)
Clark Mtn. (3511555), Fountain Peak (3411585), Ivanpah (3511533), Kelso (3511516), Mescal Range (3511545), Pinto Valley (3511523)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



See Annals of the Missouri Botanical Garden 41:193 (1954) for revised nomenclature.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 24 October 2025].