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''Helenium elegans'' is a North American perennial plant in the Sunflower Family, commonly known as pretty sneezeweed.〔 It is native to the south-central United States and to northeastern 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 elegans'' is an annual herb up to 120 cm (4 feet) tall. Stems have wings, meaning that they have flaps of tissue running down the sides. One plant can produce 200 or more small flower heads, in branching arrays. The head is very nearly spherical, nearly covered with as many as 700 disc florets, each floret yellow near the base but brown towards the tip. There are also 1-17 yellow or brown ray florets. The species grows along streambanks and in ditches.〔 ;Varieties〔(The Plant List, ''Helenium elegans'' DC. )〕〔(Flora of North America, ''Helenium elegans'' de Candolle 1836. Pretty sneezeweed )〕 *''Helenium elegans'' var. ''amphibolum'' (A.Gray) Bierner - Texas, Coahuila, Nuevo León, San Luis Potosí, Tamaulipas *''Helenium elegans'' var. ''elegans'' - Texas, Arkansas, Oklahoma, Louisiana ==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 elegans」の詳細全文を読む スポンサード リンク
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