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Taxon  Report  
Holocarpha macradenia  (DC.) Greene
Santa cruz tarplant
Holocarpha macradenia is an annual herb that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.1 (rare, threatened, or endangered in CA and elsewhere).
State of California status: Endangered. Federal status: Threatened.
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
~457 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle
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Bloom Period
Genus: Holocarpha
Family: Asteraceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Communities: Coastal Prairie, Valley Grassland
Name Status:
Accepted by JEF + CNPS + PLANTS
Alternate Names:
ICPNHemizonia macradenia
Information about  Holocarpha macradenia from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (HOMA)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net

[Wikipedia] Aroma: The aroma of the plant has variously been described as strong, citrusy, tangerine and Christmas treelike. The pungent smell protects it by repelling many would be feeders. (link added by Mary Ann Machi)

[Wikipedia] Endangered & Threatened Species Status: Santa Cruz tarplant had been considered almost extinct by the year 1960. Subsequently, it was listed as a California endangered species and federal threatened species. (link added by Mary Ann Machi)


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 11/22/2024).