Pseudostachyum polymorphum is a monotypic Asian species of bamboo in the grass family.

[2][3][4] It is the only known species of the genus Pseudostachyum.

The plant is found in Assam, Arunachal Pradesh, Bhutan, Myanmar, Vietnam, Thailand, and southern China (Yunnan, Guangdong, Guangxi).

[1][5] see Melocalamus Neohouzeaua