Fls 55mm wide; perianth segments 23mm long, ovate, truncate, lemon yellow, with pale mucro, spreading, plane or with margins slightly incurving, smooth and of heavy substance, overlapping half; the inner segments narrower, shouldered at base, more nearly plane, blunt at apex, less prominently mucronate; corona 15mm long, cup-shaped, opening yellow, becoming white with yellow at base, ribbed, mouth straight, irregularly wavy, with rim entire.

Given this name because of the daffodil’s rapid rate of bulb increase.