Fl. 105 mm wide, facing up; perianth segments broadly ovate, blunt, brilliant greenish yellow, with fine lines of strong yellow-green on a whitish ground at base and a pale mucro at apex, spreading, plane, smooth and of heavy substance, overlapping half; the inner segments with margins wavy; corona funnel-shaped, smooth, greenish yellow, with the darker tone of the perianth segments at rim, mouth ribbed and flared, with rim notched and crenate.