Fl. forming a double triangle, 102 mm wide; perianth segments 41 mm long, broadly ovate, blunt, slightly mucronate, white, spreading, plane to a little concave, smooth and of heavy substance, overlapping half; the inner segments narrower, shouldered at base, less prominently mucronate; corona 25 mm long, cup-shaped, smooth, orange, with green at base and a narrow band of yellow at rim, mouth a little flared, lightly ribbed, wavy, with rim notched. Sunproof. Sweetly scented.

Named for the region where Ms. Tilghman lives, Choptank River in Maryland, U.S..