Grab grass

From Ardrana

Ranging 3 to 5 feet in height, grab grass looks like ordinary tall grass. Grab grass is able to move, and often gives the impression of swaying in a breeze. The grass attacks by wrapping long tendrils around unsuspecting victims and strangling them. The decomposing body then feeds the plant.

Note: Grab grass originally appeared in this form in the Mystara Monstrous Compendium Appendix for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.