Fl. forming a double triangle, 105 mm wide; perianth segments broadly ovate, blunt, deep yellow, with white mucro, spreading, a little concave, with margins minutely incurling, smooth and of heavy substance, overlapping half; the inner segments more narrowly ovate in outline and square-shouldered at base, or somewhat roundish, more nearly plane; corona funnel-shaped, lightly ribbed, orange-yellow, mouth flared, lightly frilled, with rim shallowly notched and crenate.