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
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James H. Miller, USDA Forest Service, Bugwood.org bug_5421996
Leaflets 2-3x long as wide (vs. 1.5-2x in L. bicolor), per Weakley's Flora.
COMPARE leaves that are trifoliolate and pinnately compound
James H. Miller, USDA Forest Service, Bugwood.org bug_5421997
Stems purplish when young, many per crown (vs. 1-several in L. bicolor), per Weakley's Flora.