''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 ''Deinandra'' is a genus of flowering plants in the tribe Madieae within the family Asteraceae. Such a genus is not recognized as distinct by all authorities; its species are often treated as members of the genus '' Hemizonia''. Distribution ''D ...

''. Furthermore, ''Hemizonia'' is currently being revised; some species may be segregated into new genera.

Range

The ''Hemizonia'' tarweeds are native to southwestern

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

, 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 ''Deiandra arida'' (formerly ''Hemizonia arida''), also called Red Rock tarplant, is a rare California annual plant in the family Asteraceae.Mojave Desert Wildflowers, Pam MacKay, 2nd Ed. 2013, p. 189 Habitat and range ''Deiandra arida'' occur ...

'' — Red Rock tarweed * ''

Hemizonia clementina ''Deinandra clementina'', known by the common name island tarplant, is a species of flowering plant in the family Asteraceae, endemic to the Channel Islands of California. Range ''Deinandra clementina'' is found in all of the Channel Islands e ...

'' — Catalina tarweed; Santa Catalina Island, Channel Islands * ''

Hemizonia congesta ''Hemizonia congesta'', known by the common name hayfield tarweed, is a species of flowering plant in the family Asteraceae, native to western North America. Description ''Hemizonia congesta'' is a spindly, thin-stemmed annual herb growing ere ...

'' — hayfield tarweed; Central Valley (California), California Coast Ranges, SW Oregon * ''Hemizonia conjugens—

Deinandra conjugens ''Deinandra conjugens'' (syn. ''Hemizonia conjugens'') is a rare species of flowering plant in the family Asteraceae known by the common names Otay tarplant and Otay tarweed. It is native to a small section of far northern Baja California in Mexi ...

'' — Otay tarweed; Otay Mesa area, San Diego. * ''Hemizonia fasciculata—

Deinandra fasciculata ''Deinandra fasciculata'' (syn: ''Hemizonia fasciculata''), known by the common names clustered tarweed and fascicled spikeweed, is a species of flowering plant in the family Asteraceae native to western North America.

'' — clustered tarweed; Santa Monica Mountains. * ''

Hemizonia fitchii ''Centromadia fitchii'', common name Fitch's spikeweed or Fitch's tarweed, is a species of North American plants in the tribe Madieae within the family Asteraceae. It is native to California and southwestern Oregon. ''Centromadia fitchii'' is a ...

'' — Fitch's tarweed * ''

Hemizonia floribunda ''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 s ...

'' — Tecate tarweed * ''

Hemizonia frutescens ''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 s ...

'' * ''

Hemizonia greeneana ''Deinandra greeneana'' is a rare North American species of plants in the tribe Madieae within the family Asteraceae. ''Deinandra greeneana'' has been found only in the state of Baja California in northwestern Mexico. The species was thought fo ...

'' * ''Hemizonia increscens—

Deinandra increscens ''Deinandra increscens'' is a species of flowering plant in the family Asteraceae known by the common name grassland tarweed. It is endemic to California, where it has been found primarily in Monterey, San Luis Obispo and Santa Barbara Counties ...

'' — grassland tarweed; coastal California and & Channel Islands * ''

Hemizonia kelloggii ''Deinandra kelloggii'', Kellogg's spikeweed or Kellogg's tarweed, is a North American species of plant in the tribe Madieae within the family Asteraceae. It is native to Baja California, southern and central California (from Sonoma and Calave ...

'' — Kellogg's tarweed * '' Hemizonia lobbii'' — threeray tarweed * ''Hemizonia minthornii—

Deinandra minthornii ''Deinandra minthornii'' — (syn. ''Hemizonia minthornii'') — is a rare California species of flowering plant in the family Asteraceae known by the common name Santa Susana tarplant, or Santa Susana tarweed. It is listed as a rare species by ...

'' — Santa Susana tarweed; Simi Hills, Santa Susana Mountains, and Santa Monica Mountains

chaparral Chaparral ( ) is a shrubland plant community and geographical feature found primarily in the U.S. state of California, in southern Oregon, and in the northern portion of the Baja California Peninsula in Mexico. It is shaped by a Mediterranean c ...

. State and CNPS listed vulnerable species. * ''Hemizonia mohavensis—

Deinandra mohavensis ''Deinandra mohavensis'', commonly known as Mojave tarplant or Mojave tarweed, is a species of flowering plant in the family Asteraceae. Description ''Deinandra mohavensis'' is an annual herb growing 10-100 centimeters (4-40 inches) tall. The ...

'' — Mojave tarweed; west Mojave Desert, Transverse Ranges, northern

Peninsular Ranges The Peninsular Ranges (also called the Lower California province) are a group of mountain ranges that stretch from Southern California to the southern tip of the Baja California peninsula; they are part of the North American Coast Ranges, which ...

* ''

Hemizonia palmeri ''Deinandra palmeri'' is a rare North American species of plants in the tribe Madieae within the family Asteraceae. ''Deinandra palmeri'' has is native to the state of Baja California in northwestern Mexico. The species has been found only on G ...

'' * '' Hemizonia paniculata'' — San Diego tarweed * '' Hemizonia pungens'' — common tarweed Encyclopedia of Life: Information on Common Tarweed (''Hemizonia pungens'')
. accessed 6.24.2012 * ''

Hemizonia streetsii ''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 sp ...

References

External links

USDA Plants Profile: ''Hemizonia'' (Tarweeds)Jepson Manual Treatment: ''Hemizonia''Encyclopedia of Life: Information on the Tarweeds (''Hemizonia'' species)
* Madieae Flora of California Flora of Baja California Flora of Northwestern Mexico Flora of the Northwestern United States Flora of the Southwestern United States Taxa named by Augustin Pyramus de Candolle Asteraceae genera {{Madieae-stub