Cirsium lanceolatum, commonly known as spear thistle, is a species of thistle found in North America. Some synonyms for the name include Cirsium lobatum and Cirsium glabrum. The spear thistle has sharp spines that discourage animals from grazing on it, and it produces beautiful pink or purple flowers in the summertime. It is also popular as a medicinal plant, as its extract can be used to treat a variety of ailments such as headache, fever, and liver diseases. Despite its prickly exterior, the spear thistle is a beautiful and useful plant that deserves recognition and protection.