derived from the Greek word "onkos", meaning "swelling".Widespread from Mexico, Caribbean, parts of Florida to South America . most are epiphytes, some are lithophytes or terrestrials. Characterized by presence of column wings, presence of callus on the lip, pseudobulbs with one to three leaves, basal bracts at the base. shades of yellow, red, white, and pink. Petals are ruffled on the edges, long. Masses of tiny orchid flowers in thin, branching stems.