Fl. 95 mm wide; perianth segments very broadly ovate, blunt, slightly mucronate, brilliant yellow, spreading, plane or a little concave, overlapping half or more; the inner segments slightly inflexed, sometimes twisted; corona split to base, the six segments three-quarters the length of the perianth segments, opposite and closely overlying them, of the same width and joined at margins in lower half, squarish at apex, heavily ribbed and frilled, darker in tone than the perianth.