Hemizonia
Hemizonia is a genus of plants in the family Asteraceae. They are known generally as tarweeds, although some tarweeds belong to other genera, such as Madia and Deinandra. Furthermore, Hemizonia is currently being revised; some species may be segregated into new genera.
Range
The Hemizonia tarweeds are native to southwestern North America, especially California.
Description
Hemizonia are usually sticky, aromatic, yellow-flowered annual plants which are hardy and competitive, especially in the dry Mediterranean climate of California.
Selected species
Hemizonia arida — Red Rock tarweedHemizonia clementina — Catalina tarweed; Santa Catalina Island, Channel IslandsHemizonia congesta — hayfield tarweed; Central Valley (California), California Coast Ranges, SW OregonHemizonia conjugens—Deinandra conjugens — Otay tarweed; Otay Mesa area, San Diego.Hemizonia fasciculata—Deinandra fasciculata — clustered tarweed; Santa Monica Mountains.Hemizonia fitchii — Fitch's tarweedHemizonia floribunda — Tecate tarweedHemizonia frutescensHemizonia greeneanaHemizonia increscens—Deinandra increscens — grassland tarweed; coastal California and & Channel IslandsHemizonia kelloggii — Kellogg's tarweedHemizonia lobbii — threeray tarweedHemizonia minthornii—Deinandra minthornii — Santa Susana tarweed; Simi Hills, Santa Susana Mountains, and Santa Monica Mountains chaparral. State and CNPS listed vulnerable species.Hemizonia mohavensis—Deinandra mohavensis — Mojave tarweed; west Mojave Desert, Transverse Ranges, northern Peninsular RangesHemizonia palmeriHemizonia paniculata — San Diego tarweedHemizonia pungens — common tarweed