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Persicaria
''Persicaria'' is a genus of flowering plants in the knotweed family, Polygonaceae. Plants of the genus are known commonly as smartweeds.〔(''Persicaria''. ) Flora of North America.〕 It has a cosmopolitan distribution, with species occurring nearly worldwide.〔〔(''Persicaria''. ) New South Wales Flora Online. National Herbarium, Royal Botanic Garden, Sydney.〕 The genus was segregated from ''Polygonum''.〔Wilson, K. L. (1990). (Some widespread species of ''Persicaria'' (Polygonaceae) and their allies. ) ''Kew Bulletin'' 45(4) 621-36.〕
==Description==
The genus includes annual and perennial herbs with taproots or fibrous root systems, and sometimes rhizomes or stolons. The stems are often erect but may be prostrate along the ground, and some species are prickly.〔 The stems are self-supporting or twining and climbing.〔(''Persicaria''. ) FloraBase. Western Australian Herbarium.〕 The leaves are alternately arranged, deciduous, and variously shaped. The brownish or reddish ochrea may be leathery to papery. The inflorescence may be a panicle or a spikelike or headlike arrangement of fascicles of flowers. The flower is white, greenish, reddish, or purple, with the tepals partially fused together along the bases. The fruit is an achene which can take a number of shapes, including a disc or a sphere.〔
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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