Hypericum virginianum, commonly known as Virginia St. John's wort, is a species of Hypericum native to eastern North America. It's a tall, perennial herb with bright yellow flowers, and its leaves and stems contain hypericin, a compound with medicinal properties. There are a few synonyms that can be used to refer to this plant, such as St. Andrews Cross, Aaron's Beard, and Turkey Weed. These names reflect different aspects of the plant's appearance or traditional uses. St. Andrews Cross, for example, refers to the arrangement of the leaves that resembles the Scottish flag, while Turkey Weed may come from the fact that the plant was used as a poultice for turkey bites.