Karyologic and Heterosis Studies of the Artificial Inter- and Intraspecific Hybrids of Viola ×wittrockiana and Viola cornuta in: HortScience Volume 53 Issue 9 (2018)
Viola x wittrockiana (Lady's Delight, Pansy) | North Carolina Extension Gardener Plant Toolbox
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pansy | Description, Flower, Species, & Facts | Britannica
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Perennial Pansy (Viola x wittrockiana) | My Garden Life