[Wikipedia] Range: Sporobolus flexuosus is a species of grass known by the common name mesa dropseed.[1] It is native to western North America, where it can be found in the deserts and woodlands of the Southwestern United States and Northern Mexico. (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: 03/28/2025).