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Helianthus silphioides : ウィキペディア英語版 | Helianthus silphioides
''Helianthus silphioides'' is a North American species of sunflower known by the common name Rosinweed sunflower. It is native to the central United States, primarily in the Ozarks and the Tennessee Valley with additional populations north into Kentucky and Illinois and south as far as Louisiana and Alabama. 〔(Biota of North America Program 2014 county distribution map )〕 ''Helianthus silphioides'' grows in open locations. It is an perennial herb up to 300 cm (10 feet) tall. Leaves are broadly egg-shaped. One plant usually produces 3-15 flower heads, each containing 8–13 yellow ray florets surrounding 75 or more red disc florets.〔(Flora of North America, ''Helianthus silphioides'' Nuttall, 1841. Rosinweed sunflower )〕 ==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「Helianthus silphioides」の詳細全文を読む
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