Catbrier is a plant species that belongs to the smilax plant family. It is known by several synonyms such as greenbrier, horse brier, bull brier, briar, and prickly vine. The plant is native to North America, and its leaves and stems are covered in thorns that make it a difficult plant to handle. Catbrier has been used in traditional medicine to treat a variety of conditions, including skin irritations and arthritis. It is widely considered a pest plant due to its tendency to form thick, impenetrable thickets that can choke out other plants. Despite its prickly nature, catbrier provides food and shelter for a variety of wildlife and insect species.