[Wikipedia] Europe & Asia Native, Introduced & Weed Elsewhere, Similar Species: It is native to Europe and Asia, but it is present on other continents as an introduced species, and sometimes a noxious weed. This species is similar to its relative, Kickxia elatine, but for the shape of its leaves, and the hairy flower stalk, which is bare with Kickxia elatine. (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. Berkeley, California:The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 02/16/2025).