Provided by the Noble Foundation, a charitable foundation located in Ardmore, Oklahoma that focuses on agriculture and plant biology, this site contains images of over 600 vascular plants native primarily to the Oklahoma-Texas region. Offered as an educational tool for botanists, natural resource managers, and students, the site divides the images into three main categories: Grasses & grasslike...

Sponsored by the University of Alabama Center for Public Television and Radio, this site is devoted to the weed that conquered the southern US. Introduced in the late 1800s as an ornamental plant, kudzu was aided in its expansion through planting for erosion control during the Depression. It was declared a weed by the US Department of Agriculture in 1972. Growing at a rate of more than a foot per...