Dendrocalamus giganteus

Height 30 m , diameter 10-30 cm . internode 30-40 cm . culm top drooping , young culm pruinose , internodes at base having air root ; manifold branching , main branching , main branch often under developed ; culm sheath caducous , initially light purple , its back covered with dark brown setae ; sheath auricles long , narrow , with wavy rugae ; sheath ligule 8-12 mm high ; sheath blade triangularly lanceolate ; leaves round lanceolate , turned outside down , of various size , 15-45 cm long , 3-6 cm wide , back of fresh leaf hairy . used as construction materials , for weaving .