Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may find it helpful to read Lespedeza Species in the Carolinas by Bill Stringer.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Fabales
Korean-clover, Korean Lespedeza
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Richard and Teresa Ware rtw_k_stipulacea_4
Leaflets emarginate at the apex, conspicuously spreading-ciliate, per Weakley's Flora.
COMPARE leaves that are trifoliolate and pinnately compound
Terry Holdsclaw tdh_kummerowia_stipulacea
September Catawba County NC
Mid-stem leaves with petioles 4-10mm long; stems antrorsely appressed-strigose, per Weakley's Flora.