Fl. 105 mm wide, close to vivid yellow, facing up; perianth segments broadly ovate in outline, blunt or squarish at apex, slightly mucronate, touched with strong yellow-green at base, spreading, plane, sometimes a little concave at apex, smooth and of heavy substance, overlapping half; the inner segments shouldered at base, slightly inflexed, with margins a little wavy; corona funnel-shaped, lightly ribbed, mouth only slightly flared, with rim notched and crenate, the crenations themselves minutely crenate.