Stylocline masonii is an annual herb that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.1 (rare, threatened, or endangered in CA and elsewhere).
[Wikipedia] Limited Range, Habitat: It is endemic to California, where it is known from scattered small occurrences between Monterey and Los Angeles Counties. It grows in various types of sandy habitat. It is similar to baretwig neststraw (Stylocline psilocarphoides) and was taxonomically separated from it in 1992. (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).
one or more occurrences