Pseudostachyum polymorphum (thin-walled bamboo) is an Asian species of bamboo in the grass family. 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). formerly included see Melocalamus Neohouzeaua \n* Pseudostachyum compactiflorum - Melocalamus compactiflorus \n* Pseudostachyum glomeriflorum - Melocalamus compactiflorus \n* Pseudostachyum helferi - Neohouzeaua helferi