A natural occurring hybrid of V. lentago x V. prunifolium which originated in the Arnold Arboretum where it was noticed by J.G. Jack in 1908. Plant characteristics can resemble either parents or a combination of both. Reported to me about a plant growing in northern Ohio next to V. lentago that the foliage of 'Jackii' was clean and the plant had minimal suckering whereas the V. lentago had mildew and the usual suckering. There may be potential here for a native ornamental tree with attractive flowers, abundant fruit set, and exceptional fall color.