Populus × jackii (balm-of-Gilead, bam bud, bom-a-gilly) is the hybrid between balsam poplar, Populus balsamifera, and the eastern cottonwood, Populus deltoides, occurring occasionally where the two parental species' ranges overlap. The name is considered a synonym of Populus ontariensis. It is sometimes called a cottonwood. This hybrid is also sometimes planted as a shade tree, and occasionally escapes from cultivation. This hybrid is also known by the synonyms

• Populus × andrewsii Sargent
• P. × bernardii Boivin
• Populus candicans W. Aiton
• P. × dutillyi Lepage
• P. × generosa Henry
• P. × gileadensis Rouleau
• P. manitobensis Dode.

The parental balsam poplar, P. balsamifera, is also known as P. tacamahaca and P. trichocarpa, and is widespread in boreal North America. The name Populus candicans has been variously used for either P. balsamifera or P. × jackii; it is currently considered a synonym of P. balsamifera.

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