The island is home to one of only three known populations of Hoffman's rockcress. Boechera (rockcress) is a genus of the family Brassicaceae. Boechera perennans is a species of rockcress known as perennial rockcress. There are also Ross's sedge and rockcress. This rockcress is a perennial herb with decumbent stems reaching 80 centimeters in length. This rockcress forms several erect stems reaching past half a meter in height at maximum. Arabis , or rockcress, is a genus of flowering plants, within the family Brassicaceae. MacDonald's rockcress is both state-listed (1979) and federally listed (1978) as endangered.