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Silphium laciniatum
''Silphium laciniatum'' is a species of flowering plant in the aster family, Asteraceae, known commonly as compassplant or compass plant. It is native to North America, where it occurs in Ontario in Canada and the eastern and central United States as far west as New Mexico.〔(''Silphium laciniatum''. ) Germplasm Resources Information Network (GRIN).〕 Other common names include prairie compass plant,〔Zhang, H., et al. (1991). (Development of leaf orientation in the prairie compass plant, ''Silphium laciniatum'' L. ) ''Bulletin of the Torrey Botanical Club'' 118(1) 33-42.〕 pilotweed, polarplant,〔 gum weed, cut-leaf silphium, and turpentine plant.〔Wynia, R. 2009. (Plant Fact Sheet for compassplant (''Silphium laciniatum'' L.). ) USDA NRCS, Kansas Plant Materials Center, Manhattan, Kansas. 2009.〕 It is a rosinweed of genus ''Silphium''.
==Description==
This plant is a taprooted perennial herb producing rough-haired stems usually one to three meters tall. The leaves are variable in shape and size, being 4 to 60 centimeters long and one to 30 centimeters wide. The are hairy, smooth-edged or toothed, and borne on petioles or not. The back of the flower head has layers of rough, glandular phyllaries. The head contains 27 to 38 yellow ray florets and many yellow disc florets. The fruit is a cypsela which can be almost 2 centimeters long and is tipped with a pappus of two short awns.〔(''Silphium laciniatum''. ) Flora of North America.〕
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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