Calflora
Taxon  Report   738    
Asclepias asperula  (Decne.) Woodson  ssp. asperula 
Antelope horns,  Spider milkweed
Asclepias asperula ssp. asperula
© 2013 James M. Andre
Photos from
CalPhotos / Calflora
Asclepias asperula ssp. asperula
© 2013 James M. Andre
Asclepias asperula ssp. asperula
© 2012 Duncan S. Bell
Asclepias asperula ssp. asperula, a dicot, is a perennial herb that is native to California, is also found outside of California, but is confined to western North America.
CNPS Rare Plant Rank: 4.3 (limited distribution).   8th Edition

Interactive Distribution Map


Observation Hotline
(observation details + photos)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Asclepias asperula ssp. asperula
© 2013 James M. Andre
Communities: Pinyon-Juniper Woodland

Toxicity: MINOR, DERMATITIS

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
ICPN: Asclepias capricornu ssp. occidentalis
More information about  Asclepias asperula ssp. asperula
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (ASASA)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

website references from Google


Suggested Citation
Calflora: Information on California plants for education, research and conservation,
with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria.
[web application]. 2018. Berkeley, California: The Calflora Database [a non-profit organization].
Available: http://www.calflora.org/   (Accessed: Oct 17, 2018).

The information on this page comes from diverse sources. None of the links are sponsored.