Fl. forming a double triangle, 72mm wide; perianth segments 32mm long, broadly ovate, truncate, mucronate, pale yellow (18D), slightly paler in tone along midrib, spreading, plane or with margins a little incurved, with midrib showing, of heavy substance, overlapping half or more; the inner segments narrower, more nearly blunt at apex, scarcely mucronate, shouldered at base; corona 20mm long, funnel-shaped, smooth, white, mouth broadly ribbed, wavy and narrowly flared, with rim entire.