Hemizonia
Encyclopedia
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.
, especially California
.
of California.
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of plants in the daisy family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...
(Asteraceae
Asteraceae
The Asteraceae or Compositae , is an exceedingly large and widespread family of vascular plants. The group has more than 22,750 currently accepted species, spread across 1620 genera and 12 subfamilies...
). They are known generally as tarweeds, although some tarweeds belong to other genera, such as Madia
Madia
-Species:*Madia anomala Greene - plumpseeded madia*Madia chilensis Reiche*Madia citrigracilis D.D.Keck - Shasta tarweed*Madia citriodora Greene - lemon-scented madia*Madia elegans D.Don ex Lindl. - common madia...
and Deinandra
Deinandra
Deinandra is a genus of tarweeds in the daisy family. Such a genus is not recognized as distinct by all authorities; its species are often treated as members of genus Hemizonia, or as synonyms between the two genera.-Range:...
. Furthermore, Hemizonia is currently being revised; some species may be segregated into new genera.
Range
The Hemizonia tarweeds are native to southwestern North AmericaNorth America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...
, especially California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
.
Description
Hemizonia are usually sticky, aromatic, yellow-flowered annual plants which are hardy and competitive, especially in the dry Mediterranean climateMediterranean climate
A Mediterranean climate is the climate typical of most of the lands in the Mediterranean Basin, and is a particular variety of subtropical climate...
of California.
Selected species
- Hemizonia arida – Red Rock Tarweed
- Hemizonia clementina – Catalina Tarweed; Santa Catalina Island, CaliforniaSanta Catalina Island, CaliforniaSanta Catalina Island, often called Catalina Island, or just Catalina, is a rocky island off the coast of the U.S. state of California. The island is long and across at its greatest width. The island is located about south-southwest of Los Angeles, California. The highest point on the island is...
- Hemizonia congestaHemizonia congestaHemizonia congesta is a species of flowering plant in the daisy family known by the common name hayfield tarweed.-Range:Hemizonia congesta is native to California and Oregon, where it is a common member of the flora in a number of habitats, particularly grasslands and fields.-Description:Hemizonia...
– Hayfield Tarweed - Hemizonia conjugens – Otay Tarweed; Otay Mesa, San Diego, CaliforniaOtay Mesa, San Diego, CaliforniaOtay Mesa is a community in the southern section of the city of San Diego, just north of the U.S.–Mexico border. It is bordered by the Otay River Valley and the city of Chula Vista on the north, Interstate 805 and the neighborhoods of Ocean View Hills and San Ysidro on the west, and unincorporated...
area. - Hemizonia fitchii – Fitch's Tarweed
- Hemizonia floribunda – Tecate Tarweed
- Hemizonia frutescens
- Hemizonia greeneana
- Hemizonia kelloggii – Kellogg's Tarweed
- Hemizonia lobbii – Threeray Tarweed
- Hemizonia minthornii – Santa Susana Tarweed; State and CNPS listed vulnerable speciesVulnerable speciesOn 30 January 2010, the IUCN Red List of Threatened Species identified 9694 Vulnerable species, subspecies and varieties, stocks and sub-populations.-References:...
in the Simi HillsSimi HillsThe Simi Hills are a low rocky mountain range of the Transverse Ranges, located in eastern Ventura County and western Los Angeles County, of southern California, United States.-Geography:...
, Santa Susana MountainsSanta Susana MountainsThe Santa Susana Mountains are a transverse range of mountains in southern California, north of the city of Los Angeles, in the United States. The range runs east-west separating the San Fernando Valley and Simi Valley on its south, from Santa Clara River Valley to the north, and Santa Clarita...
, and Santa Monica MountainsSanta Monica MountainsThe Santa Monica Mountains are a Transverse Range in Southern California, along the coast of the Pacific Ocean in the United States.-Geography:...
areas. - Hemizonia palmeri
- Hemizonia paniculata – San Diego Tarweed
- Hemizonia pungens – Common Tarweed
- Hemizonia streetsii