Fl. rounded, 85 mm wide; perianth segments very broad, squarish at apex, vivid yellow, with slight white mucro, spreading or slightly reflexed, a little concave, smooth, with midrib showing, overlapping half; the inner segments narrower, more nearly rounded at apex; corona split, the six segments opposite the perianth segments and one-third to a half their length, ribbed, frilled, with the rim deeply crenate and the crenations overlapping.