Greenbriar

There are at least seven species of greenbriar (also called catbriar by some) in Missouri.  Several have prickles on their stems, while others do not.

Smilax spp. has a vining growth habit forming dense thickets.  Some species of Smilax are found throughout Missouri.

Prickles along the main stem.

Seed of three Smilax species.  From left: S. bona-nox, S. herbacea and S. hispida.

Life cycle: perennial.