I have yet to see one of these. Are they more common to a certain part of the zone? The mobs in this zone make it hard to just wander and track for this mob since everything here aggros.... what social little creatures this zone has!!! :( They almost took out my 65 cleric friend who was helping me yesterday along with myself before I manage to succor us out of our hot spot!
Its for the druid quest in FV - need 2 kinds of tump stumps and one of these.
Shrub Marwood of Fironia Vie needs some tump stumps, one Kromdul, one Kromdek type and a mantrap root. Get those items and he will give you a Dark Oak Shillelagh. You will also get the quest for the Charm Plant Scroll. (Mid 30s Quest)
For some reason, it appears that pets won't attack this plant. The mantrap never actually hit on me so I don't know if pet would respond that way, but it didn't respond to attack commands.