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Persicaria perfoliata
''Persicaria perfoliata'' (syn. ''Polygonum perfoliatum'') is a species of flowering plant in the buckwheat family. Common names include mile-a-minute weed, devil's tail, giant climbing tearthumb,〔(Flora of North America, ''Persicaria perfoliata'' (Linnaeus) H. Gross, 1919. Devil's-tail or giant climbing tearthumb, mile-a-minute weed )〕 and Asiatic tearthumb. It is a trailing herbaceous annual vine with barbed stems and triangular leaves. It is native to most of temperate and tropical eastern Asia, from eastern Russia in the north down to New Guinea and India in the south.〔(''Persicaria perfoliata''. ) GRIN Taxonomy for Plants.〕〔(Flora of China, ''Polygonum perfoliatum'' Linnaeus, 1759. 杠板归 gang ban gui )〕
== Appearance ==
''Persicaria perfoliata'' has a reddish stem that is armed with downward pointing hooks or barbs which are also present on the underside of the leaf blades. The light green leaves are shaped like an equilateral (equal-sided) triangle and alternate along the narrow, delicate stems. Distinctive circular, cup-shaped leafy structures, called ocreas, surround the stem at intervals. Flower buds, and later flowers and fruits, emerge from within the ocreas. Flowers are small, white and generally inconspicuous. The fruits are attractive, metallic blue and segmented, each segment containing a single glossy, black or reddish-black seed.〔
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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