Fl. 100 mm wide; perianth segments broadly or very broadly ovate, blunt, brilliant greenish yellow, with prominent white mucro, a little reflexed, plane, overlapping one-third to a half; the inner segments more nearly spreading, slightly concave and somewhat twisted, with margins notched; corona cylindrical, opening yellow, becoming pale yellowish white, touched with a darker tone at rim, mouth expanded and frilled, rim flanged and irregularly notched.