logo Calflora, a 501c3 non-profit
Taxon  Report  
Euphorbia exstipulata  Engelm.
Squareseed spurge
Euphorbia exstipulata is an annual herb that is native to California, and also found elsewhere in North America and beyond.
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
DJJJASONAFMM

Bloom Period
Subspecies and Varieties:
Genus: Euphorbia
Family: Euphorbiaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Toxicity: Skin irritation from touching the sap of this plant.

Communities: Creosote Bush Scrub

Name Status:
Accepted by PLANTS + POWO
Alternate Names:
PLANTSEuphorbia exstipulata var. lata
Information about  Euphorbia exstipulata from other sources
Nursery availability from CNPLX
Commercial availability unknown.
USDA PLANTS Profile (EUEX4)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/14/2025).