Hybrid origin
Northeastern United States, Southeastern United States, North-Central United States, Central United States, South-Central United States, Canada
boissieri , cupanii , hungaricum , kesselringii
Tree
21,22
1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20