Beggar lice is a plant that is commonly found in North America. It has a distinctive seed that sticks to clothing and pets, which is why it is often referred to as a "hitchhiker" plant. There are many synonyms for beggar lice, including burrweed, stickweed, stickseed, and beggar's ticks. These names all refer to the plant's ability to stick to clothing or fur. Other common names for beggar lice include Spanish needle, pitchforks, devil's-thorn, and tick trefoil. Despite its pesky nature, beggar lice has been used in traditional medicine to treat a variety of ailments, including coughing, colds, and infections.