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Also known as Populus tremula. A medium-sized tree growing up to 10-25 meters tall.

Aspen

Also known as Populus tremula. A medium-sized tree growing up to 10-25 meters tall.

This shows the staminate flower of the Balsam, Populus balsamifera, (Keeler, 1915).

Balsam Flower

This shows the staminate flower of the Balsam, Populus balsamifera, (Keeler, 1915).

This shows the pistillate flower of the Balsam, Populus balsamifera, (Keeler, 1915).

Balsam Flower

This shows the pistillate flower of the Balsam, Populus balsamifera, (Keeler, 1915).

This shows the fruiting aments of the Balsam, Populus balsamifera, (Keeler, 1915).

Balsam Fruit

This shows the fruiting aments of the Balsam, Populus balsamifera, (Keeler, 1915).

Also known as Populus trichocarpa. The branch of a Black Cottonwood tree, native to western North America.

Branch of Black Cottonwood

Also known as Populus trichocarpa. The branch of a Black Cottonwood tree, native to western North America.

This shows the winter branch of Cottonwood, Populus deltoides, (Keeler, 1915).

Cottonwood Branch

This shows the winter branch of Cottonwood, Populus deltoides, (Keeler, 1915).

This shows the pistillate aments of the cottonwood, Populus deltoides (Keeler, 1915).

Cottonwood Flowers

This shows the pistillate aments of the cottonwood, Populus deltoides (Keeler, 1915).

Also known as Populus deltoides. The branch of an Eastern Cottonwood, native throughout the eastern, central, and southwestern United States.

Branch of Eastern Cottonwood

Also known as Populus deltoides. The branch of an Eastern Cottonwood, native throughout the eastern,…

Also known as Populus fremontii. The branch of a Fremont Cottonwood tree, native to western North America.

Branch of Fremont Cottonwood

Also known as Populus fremontii. The branch of a Fremont Cottonwood tree, native to western North America.

Also known as Populus grandidentata. The branch of a Large-Tooth Aspen, native to eastern North America.

Branch of Large-Tooth Aspen

Also known as Populus grandidentata. The branch of a Large-Tooth Aspen, native to eastern North America.

This shows the fruiting ament of Large-toothed Aspen, Populus grandidentata, (Keeler, 1915).

Large-Toothed Aspen Flowers

This shows the fruiting ament of Large-toothed Aspen, Populus grandidentata, (Keeler, 1915).

Also known as Populus mexicana. A branch of a Mexico Poplar tree.

Branch of Mexico Poplar

Also known as Populus mexicana. A branch of a Mexico Poplar tree.

Also known as Populus angustifolia. The branch of a Narrowleaf Cottonwood tree, native to Great Britain.

Branch of Narrowleaf Cottonwood

Also known as Populus angustifolia. The branch of a Narrowleaf Cottonwood tree, native to Great Britain.

Also known as Populus balsamifera. The branch of an Ontario Balsam Poplar tree, native to northern United States.

Branch of Ontario Balsam Poplar

Also known as Populus balsamifera. The branch of an Ontario Balsam Poplar tree, native to northern United…

The branch of a Populus acuminata, a species of poplar.

Branch of Populus Acuminata

The branch of a Populus acuminata, a species of poplar.

The branch of a Populus wislizeni, a species of cottonwood tree.

Branch of Populus Wislizeni

The branch of a Populus wislizeni, a species of cottonwood tree.

Also known as Populus tremuloides. A species of tree native to the cooler areas of North America.

Quaking Aspen

Also known as Populus tremuloides. A species of tree native to the cooler areas of North America.

This shows part of the fruiting ament of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

Swamp Cottonwood Fruit

This shows part of the fruiting ament of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

This shows the leaf of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

Swamp Cottonwood Leaf

This shows the leaf of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

Also known as Populus heterophylla. The branch from a Swamp Cottonwood tree, native to warm regions of North America.

Branch of Swamp Cottonwood

Also known as Populus heterophylla. The branch from a Swamp Cottonwood tree, native to warm regions…