Smilax rotundifolia

Found: in thickets and weedy areas

Height: varies; greenbrier is a climbing shrub

Leaves: very broad and heart-shaped. They have a leathery texture and are dark green.

Uses: members of the Genus Smilax contain the chemical diosgenin, which can be converted to testosterone (via labwork, not the human body). Experiments have also found anti-inflammatory, estrogenic, cholesterol-lowering, and anti-stress activity of Smilax species.