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- Viola striata (category Viola)1992). Viola striata reportedly hybridizes with V. labradorica (= V. ×eclipes H. E. Ballard), V. rostrata (= V. ×brauniae Grover ex Cooperrider), V. walteri4 KB (388 words) - 23:20, 5 November 2020
- Viola rostrata (category Viola)(Japan). Viola rostrata has the longest spur of any North American Viola species. Viola rostrata reportedly hybridizes with V. labradorica (= V. ×malteana3 KB (335 words) - 23:20, 5 November 2020