Homalopetalum pumilio is a tiny species from Mexico and Central America and is related to Cattleya. The plant with its tiny pseudobulbs and leaves is only 2 cm tall. They grow in succession and each growth produces one flower. The flowers dwarf the plant at 4 cm, though flower size varies considerably with the plants from Mexico having larger flowers than those from Central America. The flowers from the Mexican cersion are also more white than the green flowers from Central America.