Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Malpighiales
PLANTS National Database
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Thinleaf Violet, LeConte's Violet, Missouri Violet, Sand Violet
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Herbarium of Clemson University h_cu45564
April Calhoun County SC
Earliest leaves reniform, widely deltate, to ovate; midseason leaves deltate, per Violaceae of the Southeastern US. Castanea (McKinney & Russell, 2002).
Herbarium of Clemson University h_cu81583
April Mecklenburg County NC
Most or all blades longer than broad, glabrous or glabrate, per Weakley's Flora.
Patrick D. McMillan pdmvaffinis_2
Varieties sororia & missouriensis are not yet clearly understood, per Weakley's Flora.
Patrick D. McMillan pdmviola_affinis
Similar to V sororia var sororia but leaves triangular & flowers pale violet, per Wildflowers of Tennessee.