Aspen: Populus tremula
- Photographs of this tree, its bark, leaves and Autumn colours.
- http://www.plant-identification.co.uk/skye/salicaceae/populus-tremula.htm

Populus balsamifera ssp. balsamifera
- Distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/popbalb/

Populus deltoides
- Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology
- http://www.fs.fed.us/database/feis/plants/tree/popdel/

Populus tremuloides
- Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology
- http://www.fs.fed.us/database/feis/plants/tree/poptre/

Populus grandidentata
- Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology
- http://www.fs.fed.us/database/feis/plants/tree/popgra/

Populus fremontii
- Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/popfre/

Populus nigra
- image
- http://www.dipbot.unict.it/orto/0718-1.html

Populus alba
- image
- http://www.dipbot.unict.it/orto/0717-1.html

Populus angustifolia
- Distribution and Occurrence; Value and Use; Characteristics; Fire Ecology
- http://www.fs.fed.us/database/feis/plants/tree/popang/