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Enceliopsis argophylla
''Enceliopsis argophylla'', commonly known as the silverleaf sunray,〔 photos plus info on ecology and conservation〕 is a North American species of flowering plant in the daisy family. Other common names include nakedstem sunray and naked-stemmed daisy. It is native to the southwestern United States: Arizona (Mohave County), Nevada (Clark County), and Utah (Washington County), and can be seen a short distance east of Las Vegas, Nevada.〔
==Description==
''E. argophylla'' is a perennial herb up to tall, appearing silvery because of many small hairs pressed against the leaves. Leaf blades are up to long, with wings running along the sides of the petioles. Appearing in April and May, the flower heads are yellow, at the ends of long peduncles, each head with as many as 35 ray florets and up to 500 tiny disc florets. The achene is strongly flattened, covered with small hairs, and sometimes with a pappus of 2 awns up to 2 mm long (unlike some of the related species).〔(【引用サイトリンク】work= Flora of North America )〕〔Sanders, D. L. and C. Clark. 1987. Comparative morphology of the capitulum of ''Enceliopsis''. American Journal of Botany 74: 1072–1086.〕
American botanist Daniel Cady Eaton described the silverleaf sunray as ''Tithonia argophylla'' in 1871.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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