Calamus flagellum ?
Calamus flagellum Griff. ex Walp., Hist. Nat. Palm. 3: 333 1853. (syn: Calamus flagellum var. furvifurfuraceus S.J.Pei & S.Y.Chen; Calamus karinensis (Becc.) S.J.Pei & S.Y.Chen; Calamus polygamus Roxb.; Palmijuncus flagellum (Griff. ex Walp.) Kuntze; Palmijuncus polygamus (Roxb.) Kuntze); . Assam to S. China and Indo-China: Assam, Bangladesh, China South-Central, China Southeast, East Himalaya, Laos, Myanmar, Thailand, Tibet, Vietnam…