Key lime description. Small evergreen tree that can reach up to 4m. tall.. The trunk is much branched, the branches are thin and have spines in the axils.. Leaves alternate, simple, entire, oblongovate and glabrous, very aromatic.. Flowers solitary or in axillary corymbs, hermaphrodites, or white petals with purple tones and very fragrant.. Fruits are fleshy berries of size and shape similar ...