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Helianthus longifolius : ウィキペディア英語版 | Helianthus longifolius
''Helianthus longifolius'' is a North American species of sunflower known by the common name longleaf sunflower. It is native to the southeastern United States (mostly Georgia and Alabama with one isolated population (probably introduced) in western North Carolina).〔(Biota of North America Program 2014 county distribution map )〕 ''Helianthus longifolius'' is a perennial herb up to 30 cm (1 foot) tall. Most of the leaves are crowded around the base, each leaf up to 30 cm (1 foot) long. Leaves and stems generally have no hairs. One plant usually produces 3-12 flower heads. Each head has 8-13 yellow ray florets surrounding 35 or more yellow disc florets. The plant grows soils derived from sandstone and granite.〔(Flora of North America, ''Helianthus longifolius'' Pursh, 1813. Longleaf 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 longifolius」の詳細全文を読む
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