Taxon  Report   8003    
Tonestus peirsonii  (D. D. Keck) G. L. Nesom & D. R. Morgan
Peirson's haplopappus,  Peirson's serpentweed
Tonestus peirsonii
© 2012 Steve Matson
Photos from
CalPhotos / Calflora
Tonestus peirsonii, a dicot, is a perennial herb that is native to California, is endemic (limited) to California.
also called Haplopappus peirsonii
California Rare Plant Rank: 4.3 (limited distribution).   8th Edition

Interactive Distribution Map

Observation Hotline
(observation details)

point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations

Bloom Period
Tonestus peirsonii
© 1992 Dean Wm. Taylor
Genus: Tonestus
Communities: Subalpine Forest, Alpine Fell-fields

Habitat: ridges

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
ICPN + PLANTS: Haplopappus eximius ssp. peirsonii
ICPN: Lorandersonia peirsonii
CNPS + PLANTS: Haplopappus peirsonii
More information about  Tonestus peirsonii
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on   /   Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation


Search the International Plants Names Index

Search (Flora of North America)

website references from Google

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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 23, 2019).