Calflora, a 501c3 non-profit
Distribution by County   8003    
Tonestus peirsonii  (D. D. Keck) G. L. Nesom & D. R. Morgan
Peirson's haplopappus,   Peirson's serpentweed
Tonestus peirsonii is a perennial herb that is native to California, and endemic (limited) to California.
also called Haplopappus peirsonii
California Rare Plant Rank: 4.3 (limited distribution).
Record Count by County

Fresno: 4 Inyo: 49 Mono: 21

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: 05/29/2024).