Dendrocalamus sinicus

Height 30 m , diameter 20-30 cm . the largest bamboo species in china . culm top drooping , internode cylindrical ; young culm heavily pruinose , some internodes near the base short , its one side often swollen , a ring of 3-4 mm long yellowish brown silky hair on the joint ; sheath on clear bole shedding late , persistent , thickly coriaceous ; sheath grayish dark green , with purple setae , longer than the internode ; sheath auricles long , narrow , with wavy rugae ; sheath blade triangularly lanceolate , green , erect , or somewhat extending outward ; sheath ligule 4-5 mm high , truncate ; leaves ovally lanceolate , 20-40 cm long , 3-8 cm wide . used as construction material , and as water pipes .