Originating by hybridization between V. tricolor and other spp. such as V. lutea Huds., and selected for large fls (5-10 cm wide) in diverse colors, occasionally escapes or persists briefly after cult.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
