More than four trigger hairs for VFT
I just checked out my North American plants very closely in preparation for dormancy and noticed my adult Flytrap, which occasionally produced four trigger hairs per lobe (a normal occurrance), is now producing four and even five trigger hairs per lobe more often than not. Interesting.
You can barely detect them here in these blurry close-ups. I fiddled with the photos as much as I could to make the trigger hairs visible. Both of these traps have 9 trigger hairs total. I guess they want to really know when something is on the leaf.