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''Helianthus nuttallii'' (Nuttall's sunflower) is a species of sunflower native to northern, central, and western North America, from Newfoundland west to British Columbia, south to Missouri, New Mexico, and California.〔Germplasm Resources Information Network: (''Helianthus nuttallii'' )〕 ''Helianthus nuttallii'' is a herbaceous perennial plant growing to 50-400 cm (20-160 inches) tall. The leaves are opposite on the lower part of the stem, alternate higher up, narrow lanceolate, 8–20 cm (3.2-8.0 inches) long and 6–30 mm wide, with a rough texture. The flowers are yellow, produced in a flowerhead approximately 9 cm (3.6 inches) diameter with 10–20 ray florets and at least 60 disc florets; each stem bears one to a few flowerheads.〔Jepson Flora: (''Helianthus nuttallii'' )〕〔Plants of British Columbia: (''Helianthus nuttallii'' )〕 ;Subspecies〔〔〔 *''Helianthus nuttallii'' subsp. ''nuttallii'' - Canada, western United States *''Helianthus nuttallii'' subsp. ''parishii'' (A.Gray) Heiser - (Los Angeles sunflower). Southern California, endemic. It is an endangered subspecies thought to have been extinct since 1937,〔(Calflora taxon report, University of California, ''Helianthus nuttallii'' Torrey & A. Gray ssp. ''parishii'' (A. Gray) Heiser, Los Angeles sunflower, Parish's sunflower )〕 but it was rediscovered in southern California in 2001. *''Helianthus nuttallii'' subsp. ''rydbergii'' (Britton) R. Long. - Central Canada, interior northwestern United States ==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 nuttallii」の詳細全文を読む スポンサード リンク
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