Fl. forming a double triangle, 110 mm wide; perianth segments broadly ovate, blunt, brilliant yellow, with prominent white mucro, spreading, plane, overlapping one-third to a half; the inner segments more narrowly ovate, inflexed and shouldered at base, reflexed towards apex, with margins wavy and sometimes nicked; corona cylindrical, a little darker than the perianth, with mouth widely expanded and lightly frilled, rim deeply and regularly notched and crenate.