Nettle
a genus of plants (Urtica) belonging to the natural order Urticaceæ, and consisting chiefly of neglected weeds, having opposite or alternate leaves, and inconspicuous flowers, which The are disposed in axillary racemes. species are mostly herbaceous, and are usually cover covered with extremely fine, sharp, tubular hairs, placed on minute vesicles filled with an acrid and caustic fluid, which by pressure is injected into the wounds caused by the sharp-pointed hairs.