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They are all medium-sized deciduous trees reaching 15–30 m (50–100 ft) tall. In North America, the aspen is referred to as quaking aspen or trembling aspen because the leaves "quake" or tremble in the wind. This is due to their flattened petioles which reduce aerodynamic drag on the trunk and branches. Aspen trees near Crested Butte, Colorado
Populus tremuloides is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name aspen.It is commonly called quaking aspen, [2] [3] [4] trembling aspen, [2] [3] American aspen, [3] mountain or golden aspen, [5] trembling poplar, [5] white poplar, [5] and popple, [5] as well as others. [5]
The Pando tree was identified in 1976 by Jerry Kemperman and Burton V. Barnes. [20] [21] A posthumous biography by Barnes' colleague, Daniel Kashian, [22] details Pando's discovery: As a part of his aspen work in the West, Burt began to examine an extremely large trembling aspen clone southwest of Fish Lake, Utah, in the late 1960s and early 1970s.
In contrast with many trees, aspen bark is base-rich, meaning that aspens are important hosts for bryophytes [9] and act as food plants for the larvae of butterfly (Lepidoptera) species—see List of Lepidoptera that feed on poplars. Young aspen bark is an important seasonal forage for the european hare and other animals
Populus grandidentata, commonly called large-tooth aspen, big-tooth aspen, American aspen, [2] Canadian poplar, [2] or white poplar, [2] is a deciduous tree native to eastern North America. Name [ edit ]
It is a substantial deciduous tree growing to 40 metres (130 ft) tall by 10 m (33 ft) broad, with a trunk attaining over 1 metre (3 ft 3 in) in diameter. [3] The bark is pale greenish-grey and smooth on young trees with dark grey diamond-shaped lenticels, becoming dark grey and fissured on older trees. [citation needed]