WHIP-WEED
The whip-weed is a small green animal with poisonous fingers which
imitate plants to lure their unsuspecting victims colors. Seen from
afar as a simple carpet of harmless plants that sway slowly from side
to side in breezeless caverns, a colony will continue to gently ripple
until the ignorant adventurer has waded far enough into the patch. Once
at the center, the whip-weeds erupt about their prey--pulling their
"roots" from the ground and wrapping their poison-filled stingers
around unfortunate adventurers.
IMAGE01: Whip-weeds at a distance