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Helenium thurberi : ウィキペディア英語版 | Helenium thurberi
''Helenium thurberi'' is a North American plant in the Sunflower Family, commonly known as Thurber’s sneezeweed.〔 It is native to Mexico (Baja California Sur, Sinaloa, Nayarit, Chihuahua) and the southwestern United States (Arizona).〔Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100〕〔(Biota of North America Program 2014 county distribution map )〕 ''Helenium thurberi'' is an annual herb up to tall, with small wings running down the sides of the stems. Leaves are lance-shaped. One plant can produce up to 120 flower heads, in a branching array. Each head has an egg-shaped or conical disc that may contain 500 or more miniscule disc flowers each across, each yellow toward the bottom but brown or reddish-brown toward the tip. There are no ray flowers.〔(Flora of North America, ''Helenium thurberi'' A. Gray, 1883. Thurber’s 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 thurberi」の詳細全文を読む
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