Calflora
Taxon  Report   2955    
Emex spinosa  (L.) Campd.
Devil's thorn,  Spiny threecornerjack
Emex spinosa
© 2017 Barbara Boethling
Photos from
CalPhotos / Calflora
Emex spinosa
© 2016 Barbara Boethling
Emex spinosa
© 2015 Ron Vanderhoff
Emex spinosa, a dicot, is an annual herb that is not native to California; it was introduced from elsewhere and naturalized in the wild. Cal-IPC rating: Moderate

Emex spinosa is classified by the U.S. Federal Government as a NOXIOUS WEED. [USDA 2000]

Interactive Distribution Map


Observation Hotline
(observation details)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Emex spinosa
© 2015 Ron Vanderhoff
Family: POLYGONACEAE  
Genus: Emex
Communities: weed, characteristic of disturbed places

Habitat: disturbed

Name Status:
Accepted by JEF + PLANTS

Alternate Names:
PLANTS: Rumex spinosus
More information about  Emex spinosa
Photos on Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (EMSP)

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: https://www.calflora.org/   (Accessed: Dec 17, 2018).