Hemizonia

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Madieae
Subtribus: Madiinae
Genus: Hemizonia
Species: H. congesta
Name

Hemizonia DC., Prodr. (DC.) 5: 692 (1836)

monotypic taxon

References

Candolle, A.P. de 1836. Prodromus Systematis Naturalis Regni Vegetabilis 5: 692–693.
Hassler, M. 2018. Hemizonia. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Feb. 22. Reference page.
International Plant Names Index. 2018. Hemizonia. Published online. Accessed: Feb. 22 2018.
Tropicos.org 2018. Hemizonia. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Feb. 22.

Links

USDA, ARS, Germplasm Resources Information Network. DC. in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: Hemizonia.
Hemizonia DC. – Taxon details on Integrated Taxonomic Information System (ITIS).
Hemizonia – Taxon details on National Center for Biotechnology Information (NCBI).

Vernacular names
English: Tarweeds

Hemizonia is a genus of plants in the daisy 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 Tarweed
Hemizonia clementina — Catalina Tarweed; Santa Catalina Island, Channel Islands
Hemizonia congesta — Hayfield Tarweed; Central Valley (California), California Coast Ranges, SW Oregon
Hemizonia conjugens—Deinandra conjugens — Otay Tarweed; Otay Mesa area, San Diego.
Hemizonia fasciculata—Deinandra fasciculata — Clustered Tarweed; Santa Monica Mountains.
Hemizonia fitchii — Fitch's Tarweed
Hemizonia floribunda — Tecate Tarweed
Hemizonia frutescens
Hemizonia greeneana
Hemizonia increscens—Deinandra increscens — Grassland Tarweed; coastal California and & Channel Islands
Hemizonia kelloggii — Kellogg's Tarweed
Hemizonia lobbii — Threeray Tarweed
Hemizonia 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 Ranges
Hemizonia palmeri
Hemizonia paniculata — San Diego Tarweed
Hemizonia pungens — Common Tarweed [1]
Hemizonia streetsii

References

Encyclopedia of Life: Information on Common Tarweed (Hemizonia pungens) . accessed 6.24.2012