Leaf blade dull green, to 4 mm wide. Spathe (1.7—)2—4(—4.2) cm. Flowers erect; perianth mostly white proximally, often strongly infused pink or purple distally, more so with age, funnelform, (4—)4.3—8.5(—10) cm; perianth tube green, (1.4—)1.6—3.3(—4) cm, increasing in diam., ca. 1/3 or more perianth length, ± equaling or seldom less than (3/4—11/4) filament length, ± equaling (2/3—11/4) spathe length; tepals slightly diverging, rarely reflexed; stamens diverging, appearing equal; filaments filiform, (1.5—)1.6—3(—3.2) cm; anthers 3—6(—8) mm; style longer than perianth tube; stigma 3-fid, usually among or below anthers, rarely exserted more than 1 mm beyond anthers; pedi-cel absent or to 0.6(—1.5) cm and shorter than spathe. 2n = 48.
Flowering late winter--spring (Feb--May). Peaty-sandy soil, coastal plains, rarely piedmont; of conservation concern; 0--100 m; Ala., Fla., Ga., Miss., N.C., S.C.
Although the perianth of Zephyranthes simpsonii was originally described as pale pink, white forms are quite common. Any of the North American white-flowered species of Zephyranthes may be variously flushed with pink, increasingly so with age.