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Doellingeria umbellata
''Doellingeria umbellata'' (known by the common names white aster or parasol whitetop)〔 is a North American plant species in the aster family. It is native to Canada (from Alberta to Newfoundland), St. Pierre and Miquelon, and the eastern and north-central United States (from Nebraska and the Dakotas east to Maine and South to Mississippi, Georgia and the Florida Panhandle.〔(Biota of North America 2014 county distribution map )〕〔(Biota of North America 2014 state-level distribution map )〕
''Doellingeria umbellata'' is a perennial up to 200 cm (80 inches) tall, spreading by means of underground rhizomes. It can sometimes produce as many as 300 small flower heads, each with as many as 16 white ray florets and 50 yellow disc florets.〔
;Varieties〔〔(Flora of North America, Tall flat-topped white aster, parasol whitetop, aster à ombelle, ''Doellingeria umbellata'' (Miller) Nees, Gen. Sp. Aster. 178. 1832. )〕
This perennial grows in full sun or part-shade and moist or draining wet soils that are best slightly acid in reaction, but adapts to moderately acid or slightly alkaline reaction.
* ''Doellingeria umbellata'' var. ''pubens'' (A.Gray) Britton - Alberta, Manitoba, Ontario, Québec, Saskatchewan, Illinois, Iowa, Michigan, Minnesota, Nebraska, North Dakota, Wisconsin
* ''Doellingeria umbellata'' var. ''umbellata'' - St. Pierre and Miquelon, Newfoundland, New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Québec, Alabama, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, West Virginia, Wisconsin
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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