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''Erigeron decumbens'' is a species of flowering plant in the family Asteraceae known by the common name Willamette fleabane. It is native to Oregon and California in the United States.
The taxonomy of the plant varies by author. It may be treated as a species with two varieties,''Erigeron decumbens''.
ITIS. the Californian variety var. ''robustior''''Erigeron decumbens''.
Jepson Manual Treatment. and the rare and endangered Oregon variety, var. ''decumbens''.USFWS
''Erigeron decumbens'' var. ''decumbens'' Five-year Review.
September 2010. Alternately, the rare var. ''decumbens'' may be the only variety included within the species description and so named ''Erigeron decumbens'',''Erigeron decumbens''.
Flora of North America. with var. ''robustior'' separated and named ''Erigeron robustior''.''Erigeron robustior''.
Flora of North America. The Oregon plant, var. ''decumbens'' or alternately ''Erigeron decumbens'', is a federally listed endangered species of the United States. There are 28 occurrences growing in increasingly rare prairie habitat in the Willamette Valley.var. ''decumbens''.
Center for Plant Conservation. The plant is a perennial herb growing up to about half a meter long, and erect or decumbent in form. The Oregon plant is
USDA Plants Profile
decumbens Flora of California Flora of Oregon {{Erigeron-stub
ITIS. the Californian variety var. ''robustior''''Erigeron decumbens''.
Jepson Manual Treatment. and the rare and endangered Oregon variety, var. ''decumbens''.USFWS
''Erigeron decumbens'' var. ''decumbens'' Five-year Review.
September 2010. Alternately, the rare var. ''decumbens'' may be the only variety included within the species description and so named ''Erigeron decumbens'',''Erigeron decumbens''.
Flora of North America. with var. ''robustior'' separated and named ''Erigeron robustior''.''Erigeron robustior''.
Flora of North America. The Oregon plant, var. ''decumbens'' or alternately ''Erigeron decumbens'', is a federally listed endangered species of the United States. There are 28 occurrences growing in increasingly rare prairie habitat in the Willamette Valley.var. ''decumbens''.
Center for Plant Conservation. The plant is a perennial herb growing up to about half a meter long, and erect or decumbent in form. The Oregon plant is
colonial
Colonial or The Colonial may refer to:
* Colonial, of, relating to, or characteristic of a colony or colony (biology)
Architecture
* American colonial architecture
* French Colonial
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Automobiles
* Colonial (1920 a ...
with a branching caudex
A caudex (plural: caudices) of a plant is a stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.pages 456 and 695
In the strict sense of the term, meaning a stem, "caudex" is m ...
sending up several stems, and is severely threatened. The inflorescence may contain many flower 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 ...
with white or blue-tinged ray florets that may dry pinkish. The California plant is not colonial and the caudex branches little or not at all. The inflorescence contains no more than 3 heads. The florets are white or pink-tinged.
References
External links
USDA Plants Profile
decumbens Flora of California Flora of Oregon {{Erigeron-stub