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Populus ×jackii Sarg. - syn.Populus ×gileadensis Rouleau; Populus manitobensis Dode; Populus candicans auct. - Betulaceae
balm-of-Gilead, Jack's poplar
Tree, hybrid of P.balsamifera and P.deltoides, native to North America.
„The tree is named after the unrelated biblical Balm of Gilead, a commiphora resin. Its leaf buds are coated with a resinous sap with a strong, pleasant turpentine or balsam odor that is most evident as the leaves unfold in the spring. For purposes of commerce, the buds are collected before they open, and can be cut up for pot-pourri or used in herbal medicine.“
http://en.wikipedia.org/wiki/Populus_%C3%97_jackii
The bud exudate of P.x jackii contains compounds characteristic of both P.balsamifera (cinnamic and coumaric acids, dihydrochalcones, terpenoids) and P. deltoides (flavanones, especially the methylated or esterified in the 3 position), indicating its hybrid origin.
[Hybrid origin of Populus x Jackii confirmed by gas chromatography-mass spectrometry analysis of its bud exudate., Greenaway, W., Davidson, C.G., Scaysbrook, T., May, J., Whatley, F.R., Z Naturforsch, Vol.45c, 1990, 594-598]
http://zfn.mpdl.mpg.de/xtf/data/Reihe_C/45/ZNC-1990-45c-0594.pdf
Populus candicans Aiton
Lounsberry, A., Rowan, E., A guide to the trees, t. 26 (1900) [E. Rowan]
http://plantgenera.org/species.php?id_species=1267696