Feverbush

This thorny bush is found throughout the Owlbear and Sellsword woods. It's a waist high bush, featuring long and flat leaves on the sprouting from thorny stems. These thorns are bright orange, and extremely hot to the touch. This is to keep insects and predators away. 
The magic of these bushes is often refined into potions or brewed into teas if one can secure the leaves without harming themselves.