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Rumex crispus
''Rumex crispus'', the curly dock, curled dock or yellow dock, is a perennial flowering plant in the family Polygonaceae, native to Europe and Western Asia.
== Description ==
The plant produces an inflorescence or flower stalk that grows to about 1 m high. It has smooth leaves shooting off from a large basal rosette, with distinctive waved or curled edges. On the stalk flowers and seeds are produced in clusters on branched stems, with the largest cluster being found at the apex. The seeds are shiny, brown and encased in the calyx of the flower that produced them. This casing enables the seeds to float on water and get caught in wool and animal fur, and this helps the seeds to spread to new locations.〔Richard H. Uva, Joseph C. Neal and Joseph M. Ditomaso, ''Weeds of The Northeast'', (Ithaca, NY: Cornell University Press, 1997), Pp. 286-287.〕 The root-structure is a large, yellow, forking taproot.
''Rumex crispus'' has a number of subspecies with distinctive habitat preferences. ''Rumex crispus'' ssp. ''crispus'' occurs on waste and cultivated ground. ''Rumex crispus'' ssp. ''littoreus'' has a coastal distribution, and ''Rumex crispus'' ssp. ''uliginosus'' occurs on tidal estuarine mud. The species hybridizes readily with other ''Rumex'' species including ''Rumex obtusifolius'', ''Rumex obovatus'', ''Rumex palustris'' and ''Rumex maritimus''.〔
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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