Populus x generosa A. Henry
(James Eckenwalder)
Synonyme : Populus x interamericana van Broekh.
Populus x generosa A. Henry includes all natural and artificial hybrids between any races of P. deltoides Marsh. and P. trichocarpa Torr. & Gray, including backcrosses and advanced generation hybrids.
The increasingly popular interamerican hybrids are the most vigorous of all the intersectional hybrids between balsam poplar in section Tacamahaca and cottonwood in section Aigeiros, at least when the cottonwood parent is one of the southern cottonwood races (P. deltoides subsp. deltoides).