Parsley haw, also known as Crataegus marshallii, is a type of hawthorn plant native to the southeastern United States. This plant is known for its small red berries and astringent properties. It is used in traditional medicine to treat a variety of different ailments. However, if you are looking for synonyms for this particular plant, there are a few options to consider. Other types of hawthorn plants could also be referred to as parsley haws, as could other plants that share the same medicinal properties. Consider exploring the world of natural medicine to discover other plants and herbs that could substitute for this useful herb.