Fl. 98 mm wide; perianth segments broadly ovate in outline, blunt or squarish at apex, vivid yellow, with slight whitish mucro, slightly reflexed, somewhat concave, regular, overlapping half; the inner segments only a little narrower, shouldered at base, more nearly spreading; corona funnel- shaped, smooth in lower half, lightly ribbed towards mouth, darker in tone than the perianth segments, mouth flared, sometimes split and overlapping, wavy, with rim obscurely crenate.