Juncus supiniformis is a perennial grasslike herb (rhizomatous) that is native to California, and also found elsewhere in western North America.California Rare Plant Rank: 2B.2 (rare, threatened, or endangered in CA; common elsewhere).
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals,
Consortium of California Herbaria.[web application]. 2022. Berkeley, California:The Calflora Database
[a non-profit organization].Available: