Fl. forming a double triangle, 70 mm wide; perianth segments very broadly ovate, blunt, mucronate, pure white, spreading, plane, or with margins minutely incurling, smooth and of heavy substance, overlapping half; the inner segments narrower, a little inflexed, with margins slightly wavy; corona bowl-shaped, very shallow, ribbed, yellow, with a narrow band of red at rim, frilled, with rim dentate.