Xyris longisepala, Kral's yelloweyed grass, is an uncommon North American species of flowering plants in the yellow-eyed-grass family. It has been found only in a small region in the southeastern United States: southeastern Alabama and the Florida Panhandle. Xyris longisepala is a perennial herb up to 90 cm (3 feet) tall with long, narrow leaves up to 30 cm (12 inches) long but only 3 mm (0.12 inches) wide. Xyris longisepala is listed as an endangered species in Florida.