Hazardia detonsa Calflora

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Taxon Report

Hazardia detonsa (Greene) Greene

Island bristleweed, Island hazardia, Northern island haplopappus, Northern islands hazardia

Hazardia detonsa is a shrub that is native to California, and endemic (limited) to California.

also called Haplopappus detonsus

California Rare Plant Rank: 4.3 (limited distribution).


	Plant Range Observation Search ~167 records in California Plant Characteristics one or more occurrences within a 7.5-minute quadrangle

Bloom Period

Photos on Calflora


Genus:	Hazardia
Family:	Asteraceae
Category:	angiosperm
PLANTS group:	Dicot
Jepson eFlora section: eudicot

Communities: Coastal Sage Scrub

Name Status:
Accepted by JEF + CNPS + PLANTS + POWO

Alternate Names:


CNPS + PLANTS	Haplopappus detonsus

Information about Hazardia detonsa from other sources


Nursery availability from CNPLX This plant is available commercially. Jepson eFlora USDA PLANTS Profile (HADE4) Photos on Calflora Photos on CalPhotos Google Images Photos on iNaturalist ID Tips on PlantID.net	ITIS Original Publication citation International Plants Names Index Search efloras.org (Flora of North America) Landscape information from Calscape BONAP Distribution Map CNPS Inventory: 4.3 Consortium of California Herbaria 2 Search the Native American Ethnobotany Database	Add an Observation Location Suitability Planting Guide Distribution by County
[Wikipedia] Threat from sheep: The main threat to this species on Santa Cruz Island was the presence of feral Santa Cruz sheep. The sheep have been removed, allowing the plant to begin its recovery there. (link added by Mary Ann Machi) photos / record / common / links

Suggested Citation

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: 03/31/2025).