I loooooove the idea of a cactus snake!I saw a crawling cactus at the Cal State Botanical Gardens in Berkeley. Also known as a creeping devil, this columnar cactus "crawls" across the desert floor by growing at one end while dying at the other end. In real life this happens at the pace of plant growth but I see no reason we couldn't make it faster and more vampiric.
Here's a zygomind from one of the Pathfinder Bestiaries:A while back, I saw one of these growing near my classroom:
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(Photo Credit: wikimedia)
It's called a Latticed Stinkhorn or Red Cage. It's a very cool fungus. It starts as a white egg-like thing, then erupts into this cage structure.
Yeah, I think it was in one of the Monstrous Compendium Annuals towards the tail end of AD&D 2EWasn't there a hangman's tree someplace.