Lysimachia quadrifolia, the whorled loosestrife, whorled yellow loosestrife, or crosswort, is a species of herbaceous plant in the family Primulaceae. It native to the eastern United States and Canada.
Lysimachia quadrifolia grows to a maximum height of about 1 metre (3.3 ft). The long roots are shallow, sometimes spreading along the surface of the ground. It usually has simple, unbranched stems. The leaves are spotted and hairy on the undersides. They are borne in whorls of 3 to 7 around the stem. The flowers grow on long stalks from the leaf whorls. The five-parted flower is yellow with a reddish center and sometimes reddish margins, and streaked with dark resin canals.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- "Lysimachia quadrifolia". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 27 January 2016.
- Lysimachia quadrifolia. ITIS.
- Lysimachia quadrifolia. Freckmann Herbarium. University of Wisconsin, Stevens Point.
- Lysimachia quadrifolia. Flora of North America.
Media related to Lysimachia quadrifolia at Wikimedia Commons
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