Trimezia is a genus of flowering plants in the family Iridaceae native to the warmer parts of southern Mexico Central America South America Florida and the West Indies. The rootstock is variously described as an elongated corm or a rhizome. Plants vary in height from about 7 cm to 1.6 m. Linear to lanceolate leaves grow from the base of the plant. Most species have flowers in some shade of yellow. The six tepals are arranged in two series. The outer tepals (sepals) are larger than the inner ones (petals); both may have brown-purple markings at the base. As of spring 2019 the World Checklist of Selected Plant Families accepted about 80 species of trimezia.