Lysimachia Quadrifolia, also known as Whorled Loosestrife, is a perennial herb that belongs to the Primulaceae family. This plant is known for its whorled leaves and yellow flowers that bloom in summer. While this plant is commonly called Whorled Loosestrife, there are also several other synonyms for it. The plant is sometimes referred to as Crosswort, Foure-leav'd Grass, and Whorled Yellow Loosestrife. These names all refer to the plant's distinctive characteristics, such as the whorled leaves and yellow flowers. Other synonyms for Lysimachia Quadrifolia include Cross-leaved Loosestrife and Quadrifolium Loosestrife. Regardless of the name, this plant is a stunning addition to any garden and is known for its bright and vibrant appearance.