I am trying to ID this bamboo growing at a friends house. It has been there for at least 10 years. The max culm diameter is 2", but most are 1 - 1 1/2". I cut one of the taller culms and laid it out on the ground and it measured 39 feet(Measured with tape). There were several that were a little taller but most were 28-35 feet. It is located in Middle Tennessee in a partially shaded area along a creek. The max. distance between nodes was 14" but most were less. I know its not golden or yellow groove as I know what these look like. Any help would be greatly appreciated!