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Decodon verticillatus
''Decodon verticillatus'', the sole species in the genus ''Decodon'', is a flowering plant in the Lythraceae family. It is commonly known as waterwillow or swamp loosestrife. It is native to wetlands in the eastern half of the United States and Canada.
==Description==
Waterwillow is a clump-forming shrubby perennial that grows in swamps or shallow water. The stems are arching, angular, smooth and woody near the base, and up to tall. They sometimes root at the tip when they bough over and touch the mud. The leaves are lanceolate, either in opposite pairs or in whorls of three or four. They are up to long and wide, smooth above and hairy beneath, on very short stalks. The rose-pink flowers grow in axillary clusters. The calyx is cup shaped, the corolla under wide with usually five petals narrowing at the base. The ten stamens are projecting with five longer than the rest. There is one pistil, one style and a superior ovary. The fruit is a spherical dark brown capsule with numerous reddish seeds. Flowering takes place in June and July.〔Homer D. House, ''Wild Flowers Of New York'' University of the State of New York, 1918〕〔(Northern Prairie Wildlife Research Center )〕〔(Biota of North America Program, 2013 county distribution map )〕
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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