Aspens are a type of poplartree with leaves that move with the slightest wind. The two main species are both called 'trembling aspens' or 'quaking aspens' on account of their leaves.
Some, but not all, are classified by botanists in the section Populus.
Populus tremula – Eurasian aspen (northern Europe and Asia)
Populus tremuloides – Quaking aspen or trembling aspen (northern and western North America)
Some types of aspens
American aspen
Populus tremuloides is the American aspen. It is common in temperate and colder regions of North America.
It forms large stands (groups) of genetically identical trees (clones) connected by a single underground root system. These trees form through root sprouts coming off an original parent tree. The largest known fully connected aspen is a grove in Utah nicknamed 'Pando', and some experts call it the largest organism in the world,[1] by mass or volume.[2] It covers 0.43 km2 (106 acres) and is estimated to weigh 6,600 short tons (6,000 t).[1]
It is a hardy species which tolerates long, cold winters and short summers. Aspen is dioecious, so individual trees are either male or female (in contrast to most trees, where male and female flowers occur on the same tree). Trees flower in March and April, before the leaves appear, with both the male and female trees producing catkins. Pollinated female catkins ripen in early summer and release tiny seeds which are tufted with hairs.
Like other aspens, its main method of reproduction is vegetative (asexual). It spreads extensively by root sprouts, which may be produced up to 40 metres from the parent tree. They form extensive clonal colonies.[4][5] Large numbers of new shoots can be produced in this way, especially after a major disturbance such as fire.