Schizostachyum grande Ridley

[Distribution] Southeastern Asia
       Indonesia in particular
[Local name] buluh lemeng in Indonesia,
        buloh semeliang in Malysia
        pai marieng in Thailand

Rough clumping bamboo and culm grows very straight,
while top part gradually falls down with increasing ages.
Culm is usually 11m high but sometimes up to 20m.
Special feature is very long internode length as usually 50-70cm, but more than 1m long sometimes.

Picture was taken at the afforestation area in Sumatra, Indonesia.
Left shows the branching and the right shows longest internode of 1.26m long.