Couldn't figure out how to include a picture here, but was able to post one in the gallery section, if you wouldn't mind clicking over there.
How tall is it, and how thick are the culms? Are they solid green in colour? It looks to be about 15 feet tall.
From that photo, I would guess that it is one of the Bambusas. It is growing very erect, but it may be tied together to give that appearance.