Populus tremula (Aspen)
Also known as: European Aspen
Native: Europe including Britain, north Africa, Asia
Location: Commonly forms thickets in the wild as it suckers easily.
Leaves are almost round with wavy edges but on suckers may be wedge-shaped. They have stems flattened which causes them to quiver in the wind. They have pairs of glands where the blade meets the stem and turn clear yellow in autumn.
Flowers open in February, male catkins pinkish with grey silky hairs about 5-10cm long, females also grey and silky.
Fruiting catkins are about 10-12.5cm long and shed white woolly seeds in May.