O. David Niswonger
b 1925. d 2022. Cape Girardeau, Missouri, USA
O. David NiswongerFl. 114mm wide; perianth segments 51mm long, broadly ovate, blunt, slight white mucro, spreading, plane or with margins incurling, smooth and of heavy substance; the inner segments significantly narrower; corona 38mm long, cup-shaped, smooth, mouth frilled, with rim entire.