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Juncus Lancangensis Y.Y.Qian, sp.nov (Subgen.Alpini,Sect.(Concinni) Affinis J.glomerato K.F.Wu,sed foliis basilaribus (1~)2(~4), caulinis 2~ 3,laminis 0.8~1.7mm latis, auriculis 1~3mm longis, bracteis lanceolatis vel tr iangulo-ovatis, 3-nervis, 5~7.5mm L