<Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (March 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article includes a list of references, but its sources remain unclear because it has insufficient inline citations . Please help to improve this article by introducing more precise citations . (March 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> Polygonum perfoliatum (syn . Persicaria perfoliata) is a species of flowering plant in the buckwheat family . Common names include mile - a-minute weed, devil's tail, giant climbing tearthumb, 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 the Philippines and India in the south . </P> <P> Polygonum perfoliatum 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 . </P>

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