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''Helenium microcephalum'' is a North American perennial plant in the Sunflower Family, commonly known as smallhead sneezeweed.〔 It is found in the southwestern and south-central United States and northern Mexico.〔(Biota of North America Program 2014 county distribution map )〕〔Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100〕 ''Helenium microcephalum'' is an annual herb up to 120 cm (4 feet) tall, with wings running down the sides of the stems. Leaves are narrow and elliptical. One plant can have 300 or more small spherical or egg-shaped flower heads, generally no more than 12 mm (half an inch) in diameter. Each head can have 400 or more miniscule disc flowers 1.2–2.4 mm (0.05-0.10 inches) across, each yellow or yellow-green toward the bottom but brown or red toward the tip. There are also 7-13 red or yellow ray flowers.〔(Flora of North America, Helenium microcephalum de Candolle, 1836. Smallhead sneezeweed )〕 ;Varieties〔〔 *''Helenium microcephalum'' var. ''microcephalum'' - Arizona, New Mexico, Oklahoma, Colorado, Texas, Coahuila, Nuevo León, Tamaulipas *''Helenium microcephalum'' var. ''ooclinium'' (A. Gray) Bierner - Texas, Coahuila, Chihuahua, Nuevo León, Durango, San Luis Potosí ==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「Helenium microcephalum」の詳細全文を読む スポンサード リンク
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