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Helenium campestre : ウィキペディア英語版 | Helenium campestre
''Helenium campestre'' is a North American perennial plant in the Sunflower Family, commonly known as Oldfield sneezeweed.〔 It is native to the southeastern United States, in Arkansas and northwestern Louisiana.〔(Biota of North America Program 2014 county distribution map )〕 ''Helenium campestre'' is an perennial herb up to 100 cm (40 inches) tall. One plant can produce as many as 20 flower heads, in branching arrays. The head is spherical or egg-shaped, with sometimes as many as 700 disc florets, each floret yellow near the base but purple or brown towards the tip. There are also 9-15 yellow ray florets. The species grows in ditches, fields, and streambanks.〔(Flora of North America, ''Helenium campestre'' Small, 1903. Oldfield sneezeweed )〕 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Helenium campestre」の詳細全文を読む
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