Buckthorn

From MUME

Buckthorns are aggressive, evil level 7 plants found in Fangorn.

A mass of low-spreading shrub quivers on the ground.
>examine shrub
Upon closer inspection one can notice the fine-toothed leaves of the shrub.
Its stems growing already yellow with age, the hairless twigs generate
thorned ends, sharp enough to tangle into bare skin or clothes. The elliptic
leaves also appear sticky upon touching.