Smilax rotundifolia
 Smilax rotundifolia known as common greenbrier is a woody vine native to the Eastern United States and Canada. The leaves are glossy green petioled alternate and circular to heart-shaped. They are generally 5–13 cm long. Common greenbriar climbs other plants using green tendrils growing out of the petioles.The stems are round and green and have sharp spines. The flowers are greenish and are produced from April to August. The fruit is a bluish black berry that ripens in September.