Fl. 105 mm wide; perianth segments very broadly ovate, blunt, brilliant greenish yellow, with prominent white mucro, spreading or somewhat reflexed, plane, overlapping half; inner segments more usually spreading, with margins wavy and sometimes distorted at shoulder; corona split to base, the six segments half as long as the perianth segments and opposite and closely overlying them, squarish at apex, ribbed, orange, deeply frilled.