U.S. selection #3563, a first-generation cross of a frost-hardy virginiana x Midland. This selection was very vigorous and very productive but small. (See Plate 14-4, center photo, and Plate 8-2.)
Crosses of large with large give large-fruited seedlings. Here Massey (LEFT) x Eleanor Roosevelt (RIGHT) gave this very large U.S.-N.C. #1158 selection.
Selfed seedlings of Eleanor Roosevelt showing the enormous difference in vigor; few were as vigorous as that to the left and very few survived that were as weak as the one to the right.