Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Fabales
Persian Clover, Reversed Clover
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John D. Byrd, Mississippi State University, Bugwood.org bug_1391301
Calyx strongly 2-lipped, calyx tube bladdery and greatly inflated in fruit, per Vascular Flora of the Carolinas.
John D. Byrd, Mississippi State University, Bugwood.org bug_1391302
Heads terminal or axillary, not subtended by a pseudo-involucre, per Weakley's Flora.