[Wikipedia] Native Range, Worldwide Invasive: Euphorbia exigua, dwarf spurge or small spurge, is a species of Euphorbia in the spurge family (Euphorbiaceae), native to Europe, northern Africa and the Near East, and invasive worldwide. (link added by Mary Ann Machi)
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: 04/03/2025).