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16 poplars, cottonwoods, and aspens species
Populus tremuloides
Populus deltoides
Populus grandidentata
Populus balsamifera
Populus trichocarpa
Populus alba
Populus nigra
Populus angustifolia
Populus heterophylla
Populus tremula
Populus fremontii
Populus simonii
Populus laurifolia
Populus suaveolens
Populus maximowiczii
Populus lasiocarpa
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