Hemizonia
Encyclopedia
Hemizonia is a genus
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 America
North 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 climate
Mediterranean 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, California
    Santa Catalina Island, California
    Santa 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 congesta
    Hemizonia congesta
    Hemizonia 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, California
    Otay Mesa, San Diego, California
    Otay 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 species
    Vulnerable species
    On 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 Hills
    Simi Hills
    The 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 Mountains
    Santa Susana Mountains
    The 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 Mountains
    Santa Monica Mountains
    The 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

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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