Common aspen – Populus tremula

Deciduous tree, which produces root suckers abundantly.

15–30 m high.

The bole is erect. The crown is rather narrow when young. The bark is grey and the cortex is greenish. The buds are acute, glabrous, slightly glutinous and covered with many bud scales.

The leaf arrangement is spiral. The petiole is about as long as the lamina. The lamina is 3–4 cm long, simple, orbicular, sinuate or irregularly obtusely dentate, and green beneath. The lamina of root suckers can be 10–15 cm long, cordate, acute and serrate.

The tree is dioecious and flowers in the spring before the budding of leaves. The inflorescence is a catkin. The entire catkin abscises and falls off. The catkins are pendant. The male catkins are 8–10 cm long. The female catkins are 10–18 cm long. The small achlamydeous flowers are at the axils of scales. The scales and stigmas are maroon.

The fruit is a glabrous capsule. The seeds are small, white-comose and with a long base.