A Tumbleweed's Destiny: Conquering The American West - Cook & Jenshel

One of the most iconic images of the American West is the tumbleweed rolling down a dusty road of an abandoned boomtown. The issue with that image, photographers Diane Cook and Len Jenshel point out, is that the "American tumbleweed" is an invasive species from Russia. Their photos appear in the December, 2013 issue of National Geographic magazine, where they help tell the story of the weed's own version of Manifest Destiny.