Zephyranthes simpsonii Chapman. Florida Atamasco-lily, Red-margined Atamasco-lily. Phen: Apr-May; May-Jun. Hab: Dry to dry-mesic sandy soils (usually with admixture of shell hash) of coastal fringe sandhills or mainland maritime forests, usually associated with Quercus hemisphaerica, on barrier islands or within about 10 km of the ocean (NC, SC), pine flatwoods (FL, GA). Dist: Se. NC (Brunswick and Columbus counties) and ne. SC (Horry and Georgetown counties); s. GA, c. and s. peninsular FL. Populations further west along the Gulf Coast (such as s. MS) may be introduced.

Origin/Endemic status: Endemic

Taxonomy Comments: The disjunct populations in NC and SC may differ from Z. simpsonii (sensu stricto) of s. GA and c. and s. peninsular FL, and need additional study.

Synonymy: = FNA26, GW1, K1, K4, RAB, WH3; = Atamosco simpsonii (Chapm.) Greene – S; = Hippeastrum simpsonii (Chapm.) Christenh. & Byng – Christenhusz, Fay, & Byng (2018)

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