A very large densely tufted bamboo. It is a woody grass. It forms large groves. The culms or stems can be 20-30 m high. The clumps can spread 12-24 m wide. The stalks are 15-20 cm across. They are covered with fine velvety brown hairs when young. The internodes can be 10-20 cm long lower down and 30-50 cm long higher up. The nodes are swollen. The lowest nodes have many aerial roots. The nodes in the middle and higher have branches. The culm sheath is 20-40 cm long by 20-25 cm wide. The leaf blade is 30 cm long by 2.5 cm wide.