That type of cresting on the petioles is common with the small-trapped, fused-marginal-spines Venus Flytrap clones, including "Long Red Fingers" and "Cross Teeth." The cresting also happens on quite a few other clones at times, although perhaps ironically, seemingly not as often (in my experience) on the clone named for that trait, "Crested Petioles."
Edited by xscd, 06 April 2012 - 15:03 PM.