Populus x jackii
Populus x jackii Sarg.
Engl.: balm of Gilead, balm of Gilead-buds, jack's poplar.
Suom.: ontarionpoppeli.
Sven.: ontariopoppel.
Bot. syn.: See Populus deltoides Bartr. x balsamifera L., Populus x andrewsii Sarg., Populus x bernardii Boivin, Populus x gileadensis Rouleau.
Balm of gilead buds.
Henriette's herbal blog: They're brown, compact, and very very resiny.