Fl. 95 mm wide; perianth segments broadly ovate, rounded at apex, slightly mucronate, bright yellow, spreading, overlapping half; the inner segments narrower, inflexed at base, a little reflexed towards apex, with margins wavy; corona split to base, the six segments half the length of the perianth segments and opposite and closely overlying them, deeply ribbed, dark orange-red, with yellow at base, tightly frilled.

Named after Mr. Scamp’s mother Mary Louise.