I know it's not easy in many cases to ID bamboo, but here goes anyway. Branching at the nodes doesn't have a typical Phyllostachys appearance. Leaves are all mostly 7 inches long, and are often ribbed along the length. Dark coloring at the nodes. New shoots have a fuzzy sheath. It's the only Bamboo of many that I own, without an ID (this I hate). Here's some pics for those that may want a stab at this one. Cheers, LPN.