Fl. forming a double triangle, 100 mm wide; perianth segments broadly ovate in outline, shouldered at base, blunt at apex, yellow, touched white at base, with a very slight white mucro, spreading, plane, with margins minutely incurling at apex, smooth and of heavy substance, overlapping half; the inner segments a little inflexed, with margins slightly wavy; corona cylindrical, smooth, opening with a touch of yellow at rim, becoming self white, mouth ribbed and expanded, lobed and frilled, with rim flanged and crenate.