Clint, it looks like it to me, or switch cane. How tall are they? Generally river cane grows to 12' to 15' and up to 3/4" in diameter. River cane also has a large center void and relatively thin walls. The nodes are quite pronounced on river cane as is the sulcus(indentation above the nodes) but not so much with switch cane. Switch cane rarely gets over 6" tall and 1/2" in diameter. I don't see any paper sheaths at the nodes so that is usually a sign of maturity. Take the side shoots off, bundle them up and give them a month to dry.Any that are immature will wrinkle lengthwise.