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Helenium arizonicum : ウィキペディア英語版 | Helenium arizonicum
''Helenium arizonicum'' is a North American perennial plant in the Sunflower Family, commonly known as Arizona sneezeweed.〔 It is native only to the State of Arizona in the southwestern United States, having been found only in 4 counties in that state: Apache, Navajo, Gila, and Coconino.〔(Biota of North America Program 2014 county distribution map )〕〔(SEINet, Southwestern Biodiversity, Arizona Chapter, ''Helenium arizonicum'' Blake )〕 ''Helenium arizonicum'' is an annual herb up to 70 cm (28 inches) tall. One plant can produce as many as 25 flower heads, in branching arrays. The head is very nearly spherical or egg-shaped, nearly covered with as many as 700 disc florets, each floret yellow near the base but purple towards the tip. There are also 12-18 ray florets, yellow, sometimes with purple streaks. The species grows along the edges of wet places in pine forests.〔(Flora of North America, ''Helenium arizonicum'' S. F. Blake, 1937. Arizona sneezeweed )〕 ==References==
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