Ph. nuda?

Wherever you got the bamboo from, There may be the clue.

It looks very similar to my Yellow Groove (Phyllostachys aureosulcata). I planted a division this spring, and it too has sent up a shoot.

By the clum next to the shoot, I would say that yes it is Yellow Groove. A good way to tell is gently run your fingers up and down the culm... if you feel roughness on the way up, it is Yellow Groove.

Sam

These bamboo came from a nurseryman who used a wholesaler for a batch of Nuda, Bissetii, Nigra, etc., that were generally misidentified. The sheathes are rough going up, smooth going down. However, unlike yellow groove, the culms are smooth as glass. These were tagged as Nuda from the wholesaler. A lot of oral setae are now appearing on the emerging leaves, which probably indicates these bamboo were also mislabeled.