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Taxon  Report  
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).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
(71 records)
yellowone or more occurrences
within a 7.5-minute quadrangle
bloom graphic
Bloom Period
Genus: Tonestus
Family: Asteraceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Habitat: ridges

Communities: Subalpine Forest, Alpine Fell-fields

Name Status:
Accepted by JEF + CNPS + PLANTS
Alternate Names:
JEF + PLANTSHaplopappus eximius ssp. peirsonii
JEF + CNPS + PLANTSHaplopappus peirsonii
JEFLorandersonia peirsonii
Information about  Tonestus peirsonii from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (TOPE)

Photos on Calflora

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Google Images

Photos on iNaturalist

ID Tips on PlantID.net


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 06/01/2023).