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''Antennaria howellii'' (Everlasting or Howell's Pussytoes)〔〔(Calflora taxon report, University of California, ''Antennaria howellii'' Greene Howell's pussytoes )〕 is a North American species in the genus ''Antennaria'' within the sunflower family. It is native to northern Alaska, much of Canada including the Arctic territories, and the northern United States as far south as northern California, Colorado and North Carolina.〔(Biota of North America Program 2014 state-level distribution map )〕 ''Antennaria howellii'' is an evergreen perennial plant. The form is usually basal rosettes, largely clonally propagated. The basal rosette leaves are 2–4 cm long and 6–12 mm broad, light green and spatulate, with a thin arm and a broad tip with a point. They have woolly white undersides. The flowerheads appear in May, on a stem 15–35 cm tall with smaller, slender leaves 1–4 cm long. It is commonly seen growing under pine stands.〔(Flora of North America Vol. 19, 20 and 21 Page 403 Howell’s pussytoes, antennaire de Howell, ''Antennaria howellii'' Greene )〕 ;Subspecies〔〔 *''Antennaria howellii'' subsp. ''howellii'' - western + north-central USA, western + central Canada including Yukon *''Antennaria howellii'' subsp. ''canadensis'' - northeastern USA, eastern + central Canada including Labrador *''Antennaria howellii'' subsp. ''neodioica'' - Canada, northern USA *''Antennaria howellii'' subsp. ''petaloidea'' - Canada, northern USA The plant is named for American botanist Thomas J. Howell, who collected the first known specimens of the plant in 1887.〔(Greene, Edward Lee 1897. Pittonia 3(16C): 174 ) description and commentary in English〕 ==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「Antennaria howellii」の詳細全文を読む スポンサード リンク
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