Proc. Amer. Acad. Arts 14: 300. 1879
Phenology: Flowering mid winter–spring (Jan–Apr).
Habitat: Peaty-sandy soil, usually associated with wet inlands or former pineland sites
Elevation: 0–100 m
It has generally been thought that Zephyranthes atamasca and Z. treatiae are distinguishable only by differences in leaves and habitat, and that their flowers are not significantly different. However, the greater length of the perianth tube compared with that of the filaments in Z. treatiae readily separates that species from Z. atamasca.