Tumbleweed

...I did not know this until today, but that bouncing symbol of the West, the tumbleweed, is actually an invasive species, brought over to North America from its native Ukraine by European immigrants in the 1800's.

I didn't know it was edible when young, either.

I just know it's prickly, and really a pain to remove after someone fills up your car and your dorm room with it (a Caltech prank). I found bits of it for months after that...