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Doellingeria infirma
''Doellingeria infirma'' (known by the common names cornel-leaf whitetop or cornel-leaved aster) is a perennial forb native to the eastern United States,〔(【引用サイトリンク】url=http://plants.usda.gov/core/profile?symbol=DOIN2 ) USDA, NRCS. 2014. The PLANTS Database (http://plants.usda.gov). National Plant Data Team, Greensboro, NC 27401-4901 USA.〕 that produces white composite flowers in late summer.
==Description==
''Doellingeria infirma'' has a smooth slender 45 to 90 centimeters (18-36 inches) tall stem which is rough and sparingly branched at the summit. It has no basal leaves. The lower leaves are small and obovate. Higher on the stem the leaves become larger, 5 to 12 centimeters (2-5 inches) long and 2.5 to 4 centimeters (1-3 inches) wide. They are oblong-lanceolate, entire, smooth above and sparingly hispid on the veins beneath. There are usually between 3 and 33 flower heads, each consisting of 4-20 disc florets and 3-11 ray florets. The flower heads are arranged in a terminal flat topped cluster. The fruit are cypselae each with a pappus of tawny bristles.〔Britton, Nathaniel Lord & Brown, Addison (1913). (''An Illustrated Flora of the Northern United States, Canada and the British Possessions: From Newfoundland to the Parallel of the Southern Boundary of Virginia, and from the Atlantic Ocean Westward to the 102d Meridian, Volume 3.'' ), p. 443-444. Charles Scribner's Sons, New York.〕〔(【引用サイトリンク】url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066483 ) 'eFloras (2008). Published on the Internet (http://www.efloras.org). Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.〕
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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