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Carex roanensis
''Carex roanensis'' is a species of sedge known by the common name Roan Mountain sedge. It is native to the United States, where it can be found in the southern Appalachian Mountains.〔(''Carex roanensis''. ) The Nature Conservancy.〕 It was first collected on Roan Mountain in Tennessee in 1936.〔Churchill, J. A. and K. Wurdack. (1986). (''Carex roanensis'' redicovered. ) ''Castanea'' 51(2) 149-51.〕 It was not collected again for fifty years.〔(''Carex roanensis''. ) Center for Plant Conservation.〕 Now it is known from Georgia, Kentucky, North Carolina, Pennsylvania, South Carolina, Tennessee, Virginia, and West Virginia.〔
This plant forms small clumps of stems up to 85 centimeters tall. The stem bases and leaf sheaths are tinged maroon. The leaf blades are hairy. The inflorescence contains a terminal spike and two to three lateral spikes. There has been some question as to whether this plant is a true species, or perhaps a hybrid.〔〔(''Carex roanensis''. ) Flora of North America.〕 Genetic analysis confirms that it is a species in its own right.〔Smith, T. W. and M. J. Waterway. (2008). (Evaluating the taxonomic status of the globally rare ''Carex roanensis'' and allied species using morphology and amplified fragment length polymorphisms. ) ''Systematic Botany'' 33(3):525-535.〕
This plant grows in forests at moderate or higher elevations, sometimes in wooded areas but more often in the open.〔 It is associated with beech and birch species.〔 It may grow alongside the similar ''Carex'' species ''C. aestivalis'' and ''C. virescens''.〔
==References==
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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