Virginia Knotweed (Polygonum virginianum) pol-IG-oh-num ver-jin-ee-AY-num

Why Like Sometimes called Jumpseed because touching the mature seeds causes them to jump several feet off the plant.
Description
Plant Data
I am a... Deciduous Perennial
Animals That Use It

Seeds:

   In the Landscape Focused on the Plant Leaves Flowers Fruit Fall Leaf Winter Form
 
 

Photos: Google Image Search & Flickr

image 1 image 1