Holocarpha sp.
Tarweed, tarplant, Tarplant
Family: Asteraceae · Type: Annual · Native
Holocarpha sp. (Tarweed) is a native California annual in the Asteraceae family.
How to tell it apart
vs Deinandra: Holocarpha has pit-gland-tipped stalk bracts; Deinandra stalk bracts lack pit glands.; vs Madia: Holocarpha has pit glands on stalk bracts; Madia lacks these distinctive pit glands.; vs Hemizonia: Holocarpha has pit-gland-tipped stalk bracts; Hemizonia stalk bracts lack pit glands.; vs Heterotheca: Holocarpha has yellow rays and pit-gland bracts; Heterotheca lacks pit glands, different flower structure.; vs Centromadia: Holocarpha has pit-gland-tipped stalk bracts; Centromadia lacks pit glands on bracts.
Frequently asked questions
Is Holocarpha sp. native to California?
Yes. Holocarpha sp. is native to California (recorded as native).
What plant family does Holocarpha sp. belong to?
Holocarpha sp. is in the Asteraceae family, genus Holocarpha.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · CalPhotos
Last updated 2026-04-14
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.