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sheltonii, Viola sororia, Viola striata, Viola subsinuata, Viola tomentosa, Viola tricolor, Viola trinervata, Viola tripartita, Viola umbraticola, Viola utahensis

Synonyms: Viola affinis var. subarctica J. Rousseau V. crenulata Willdenow V. sororia subsp. affinis (Leconte) R. J. Little V. sororia var. affinis (Leconte)

McKinney (1992) considered V. missouriensis a variety of V. sororia. Viola missouriensis appears to have a closer affinity to V. affinis, as Russell suggested;

nephrophylla. Viola nephrophylla reportedly hybridizes with V. cucullata (= V. ×insessa House), V. sororia var. sororia (= V. ×napae House), and V. affinis (= V