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''Helianthus occidentalis'' (fewleaf sunflower or western sunflower)〔 is a species of sunflower native to the eastern and central United States. It grows mostly in the Great Lakes Region and in the Ozarks, with additional populations scattered as far as Massachusetts, Texas, and the Florida Panhandle.〔(Biota of North America Program 2014 county distribution map )〕 ''Helianthus occidentalis'' differs from other, similar species by its sparse leaves, most of which are crowded around the lower part of the stem. This perennial plant reaches heights from two to five feet (60-150 cm). It produces one to several yellow flower heads, each with 8-14 ray florets surrounding more than 50 disc florets.〔(Flora of North America, ''Helianthus occidentalis'' Riddell, 1836. Western sunflower )〕 The word ''occidentalis'' means "western" in Latin. The plant was first described in 1836, at which time the Great Lakes Region was considered the western part of the United States.〔Riddell, John Leonard 1836. Western Journal of the Medical and Physical Sciences 9(36): 577〕〔(Tropicos, ''Helianthus occidentalis'' Riddell )〕 ;Subspecies〔〔 *''Helianthus occidentalis'' subsp. ''occidentalis'' - most of species range *''Helianthus occidentalis'' subsp. ''plantagineus'' (Torr. & A.Gray) Shinners - Texas, Arkansas ==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 occidentalis」の詳細全文を読む スポンサード リンク
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