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''Hemizonia congesta'', known by the common name hayfield tarweed, is a species of flowering plant in the family Asteraceae, native to western North America.
Jepson: H. c. subsp. tracyi
/ref>
. accessed 6.12.2012 It is a native plant in the Central Valley (California), and the California Coast Ranges.
Encyclopedia of Life; ''Hemizonia congesta'' overview.
Calflora Database: ''Hemizonia congesta'' (Hayfield tarweed) Jepson Manual eFlora (TJM2) treatment: ''Hemizonia congesta''USDA Plants Profile: Hemizonia congesta (Hayfield tarweed)''Hemizonia congesta'' — U.C. Photo gallery
Madieae Flora of California Flora of Oregon Natural history of the California chaparral and woodlands Natural history of the California Coast Ranges Natural history of the Central Valley (California) Natural history of the San Francisco Bay Area Taxa named by Augustin Pyramus de Candolle Flora without expected TNC conservation status {{Asteroideae-stub
''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 erect to in height. Like other tarweeds the stem and foliage are glandular and have an odor reminiscent of tar. Most of the long, narrow, pointed leaves are located on the lower portion of the stem below the branching flower stalks. The inflorescences are covered in glandular hairs and hold daisy-likeflower heads
A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...
. Each head has a center of yellowish dark-tipped disc florets and a fringe of bright yellow to white ray florets, often with purplish striping on the undersides. The ray florets are toothed or lobed on the tips, with the middle tooth thinner than the others.
Subspecies
There are many ''Hemizonia congesta'' subspecies, which can vary in appearance. They include: *''Hemizonia congesta'' subsp. ''calyculata'' — Mendocino tarplant *''Hemizonia congesta'' subsp. ''clevelandii'' *''Hemizonia congesta'' subsp. ''congesta'' *''Hemizonia congesta'' subsp. ''leucocephala'' — hayfield tarplant *''Hemizonia congesta'' subsp. ''luzulifolia'' *''Hemizonia congesta'' subsp. ''tracyi'' — Tracy's tarplant/ref>
Distribution and habitat
''Hemizonia congesta'' is native to California and Oregon, where it is a common member of the flora of a number of habitats, particularly in grasslands and fields.Jepson: Hemizonia congesta. accessed 6.12.2012 It is a native plant in the Central Valley (California), and the California Coast Ranges.
See also
*''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 ...
'' — the genus many other ''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 sp ...
'' species were reclassified within''.
References
*C.Michael Hogan, ed; 2010Encyclopedia of Life; ''Hemizonia congesta'' overview.
External links
Calflora Database: ''Hemizonia congesta'' (Hayfield tarweed)
Madieae Flora of California Flora of Oregon Natural history of the California chaparral and woodlands Natural history of the California Coast Ranges Natural history of the Central Valley (California) Natural history of the San Francisco Bay Area Taxa named by Augustin Pyramus de Candolle Flora without expected TNC conservation status {{Asteroideae-stub