| | Species and varieties
Populus acuminata (Lanceleaf Cottonwood, Waxleaf Cottonwood)
Populus alba (White Poplar, Silverleaf Poplar)
Populus angustifolia (Narrowleaf Cottonwood)
Populus balsamifera (Balsam Poplar, Balm of Gilead)
Populus balsamifera ssp. trichocarpa (Black Cottonwood)
Populus canadensis (Carolina Poplar)
Populus canescens (Grey Poplar)
Populus fremontii (Fremont Cottonwood, Western Cottonwood)
Populus nigra (Black Poplar, Lombardy Poplar)
Populus tremula (European Aspen)
Populus tremuloides (Quaking Aspen)
Populus ×polygonifolia synonym of Populus tremuloides (Quaking Aspen)
Populus arizonica synonym of Populus fremontii (Fremont Cottonwood, Western Cottonwood)
Populus aurea synonym of Populus tremuloides (Quaking Aspen)
Populus balsamifera var. angustifolia synonym of Populus angustifolia (Narrowleaf Cottonwood)
Populus balsamifera var. californica synonym of Populus balsamifera ssp. trichocarpa (Black Cottonwood)
Populus canadensis var. angustifolia synonym of Populus angustifolia (Narrowleaf Cottonwood)
Populus canadensis var. fremontii (S. Wats.) Kuntze synonym of Populus fremontii (Fremont Cottonwood, Western Cottonwood)
Populus candicans synonym of Populus balsamifera (Balsam Poplar, Balm of Gilead)
Populus cercidiphylla synonym of Populus tremuloides (Quaking Aspen)
Populus dilatata synonym of Populus nigra (Black Poplar, Lombardy Poplar)
Populus fortissima synonym of Populus angustifolia (Narrowleaf Cottonwood)
Populus fremontii var. arizonica synonym of Populus fremontii (Fremont Cottonwood, Western Cottonwood)
Populus fremontii var. macdougalii synonym of Populus fremontii (Fremont Cottonwood, Western Cottonwood)
Populus hastata synonym of Populus balsamifera ssp. trichocarpa (Black Cottonwood)
Populus italica synonym of Populus nigra (Black Poplar, Lombardy Poplar)
Populus macdougalii synonym of Populus fremontii (Fremont Cottonwood, Western Cottonwood)
Populus michauxii synonym of Populus balsamifera (Balsam Poplar, Balm of Gilead)
Populus nigra var. italica synonym of Populus nigra (Black Poplar, Lombardy Poplar)
Populus salicifolia synonym of Populus angustifolia (Narrowleaf Cottonwood)
Populus sennii synonym of Populus angustifolia (Narrowleaf Cottonwood)
Populus tacamahaca synonym of Populus balsamifera (Balsam Poplar, Balm of Gilead)
Populus tremula ssp. tremuloides synonym of Populus tremuloides (Quaking Aspen)
Populus tremuloides var. aurea synonym of Populus tremuloides (Quaking Aspen)
Populus tremuloides var. cercidiphylla synonym of Populus tremuloides (Quaking Aspen)
Populus trichocarpa synonym of Populus balsamifera ssp. trichocarpa (Black Cottonwood)
Populus tweedyi synonym of Populus angustifolia (Narrowleaf Cottonwood)
Populus vancouveriana synonym of Populus tremuloides (Quaking Aspen)
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