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Persicaria hydropiper
Water-pepper, water pepper or marshpepper knotweed (''Persicaria hydropiper'', syn. ''Polygonum hydropiper'') is a plant of the family Polygonaceae. It grows in damp places and shallow water. It is a widespread plant, found in Australia, New Zealand, temperate Asia, Europe, and North America.〔(Flora of China, ''Polygonum hydropiper'' Linnaeus, 1753. 辣蓼 la liao )〕〔Dennis I. Morris DI (2009) Polygonaceae, version 2009:1. In MF Duretto (Ed.) Flora of Tasmania Online. 17 pp. (Tasmanian Herbarium, Tasmanian Museum & Art Gallery: Hobart). ISBN 978-1-921599-30-9 (PDF). www.tmag.tas.gov.au/floratasmania〕〔(Biota of North America Program 2014 county distribution map )〕〔(Altervista Flora Italiana, ''Persicaria hydropiper'' (L.) Spach ) includes photos, drawings, European distribution map〕 It has some use as a spice because of its pungent flavor.
==Description==
Water pepper is an annual herb with an erect stem growing to a height of . The leaves are alternate and almost stalkless. The leaf blades are narrowly ovate and have entire margins fringed by very short hairs. They are tapering with a blunt apex. Each leaf base has stipules which are fused into a stem-enclosing sheath that is loose and fringed at the upper end. The inflorescence is a nodding spike. The perianth of each tiny flower consists of four or five segments, united near its green base and white or pink at the edges. There are six stamens, three fused carpels and three styles. The fruit is a dark brown oval, flattened nut.〔(【引用サイトリンク】title=Water pepper: ''Persicaria hydropiper'' )〕
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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