Fl. 30 mm wide; perianth segments narrowly ovate, acute, light greenish yellow, whitish at base and with white mucro, inflexed, plane, overlapping at base only,; the inner segments a little twisted; corona cylindrical, slightly constricted below mouth, lightly 6-ribbed, opening light greenish yellow soon paling to whitish, flecked yellow at base, with a narrow band of bright greenish yellow at rim, mouth flared and deeply 6-lobed, rim dentate.