Hemizonia sp.
Hayfield tarweed, Hayfield Tarweed
Family: Asteraceae · Type: Annual · Native
Hemizonia sp. (Hayfield tarweed) is a native California annual in the Asteraceae family.
How to tell it apart
vs Deinandra: Hemizonia rays often purple-veined beneath; Deinandra rays pure yellow without veining.; vs Madia: Hemizonia has paleae throughout disk; Madia has ray fruits enclosed by phyllaries.; vs Calycadenia: Hemizonia rays shallowly lobed; Calycadenia rays deeply split into spreading lobes.; vs Holocarpha: Hemizonia lacks pit glands on stalks; Holocarpha has distinctive pit-gland-tipped stalk bracts.; vs Anisocarpus: Hemizonia has chaff throughout flower disk; Anisocarpus typically lacks chaff scales.
Frequently asked questions
Is Hemizonia sp. native to California?
Yes. Hemizonia sp. is native to California (recorded as native).
What plant family does Hemizonia sp. belong to?
Hemizonia sp. is in the Asteraceae family, genus Hemizonia.
Related species
Other California species in the same genus, family, or bioregion.
- Hemizonia congesta — Hayfield tarweed
- Hemizonia congesta subsp. calyculata — Mendocino tarplant
- Hemizonia congesta subsp. clevelandii
- Hemizonia congesta subsp. congesta — Congested-headed hayfield tarplant
- Hemizonia congesta subsp. lutescens
- Hemizonia congesta subsp. luzulifolia
- Hesperevax acaulis — Dwarf evax
- Hesperevax acaulis var. acaulis — Stemless evax
- Hesperevax acaulis var. ambusticola — Fire evax
- Hesperevax acaulis var. robustior — Big evax
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.