Asteraceae

San Joaquin tarweed

Holocarpha obconica (J.C.Clausen & D.D.Keck) D.D.Keck

Family: Asteraceae
Genus: Holocarpha

Pet and kid safety: not checked yet. Check pet-safe plants

San Joaquin tarweed (Holocarpha obconica) — FlowerPhoto: Ryan Donnelly, CC BY 4.0, from iNaturalist

Is yours looking unwell? Scan your plant — free

Common names

By language (1)

English: San Joaquin tarweed

Synonyms

Hemizonia obconica J.C.Clausen & D.D.Keck
Hemizonia vernalis D.D.Keck
Holocarpha obconica subsp. autumnalis D.D.Keck
Holocarpha obconica subsp. obconica

Flowers

In flower: May, October (from 11 flowering iNaturalist observations worldwide)

Characteristics

Growth habit: Forb/herb
Lifespan: Annual
In the US and Canada: Lower 48 states: native

Photos

FlowerPhoto: Ryan Donnelly, CC BY 4.0, from iNaturalist
FlowerPhoto: Rajan Rao, CC BY 4.0, from iNaturalist
Photo: Wikimedia Commons contributor, CC BY-SA 4.0, from Wikimedia Commons
Photo: Ken-ichi Ueda, CC BY 4.0, from iNaturalist
Photo: Nicholas Wei, CC BY-SA 4.0, from iNaturalist
Photo: D Defreese, CC BY 4.0, from iNaturalist
Photo: Ken-ichi Ueda, CC BY 4.0, from iNaturalist
Photo: Ken-ichi Ueda, CC BY 4.0, from iNaturalist
Photo: Ken-ichi Ueda, CC BY 4.0, from iNaturalist
Photo: Dan Fitzgerald (Fitz), CC0, from iNaturalist
Photo: Ken-ichi Ueda, CC BY 4.0, from iNaturalist
Photo: Dan Fitzgerald (Fitz), CC0, from iNaturalist

More in Holocarpha

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.