Sub-category: Greenbrier family
A common woody vine native to the Eastern United States. 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, green and have sharp spines. The flowers are greenish, and are seen from April to August, the fruit they produce are bluish black berries that become ripe in September.
Found just about anywhere, especially in forests and roadsides.