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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 forcing of the spring to the surface can be the result of a confined aquifer in which the recharge area of the spring water table rests at a higher elevation than that of the outlet. Spring water forced to the surface by elevated sources are artesian wells. This is possible even if the outlet is in the form of a 300-foot-deep (91 m) cave.
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 ] The adult leaves , produced on branches of mature trees, are nearly round, slightly wider than long, 2–8 cm (1–3 in) diameter, with a coarsely toothed margin and a laterally ...
Leaf of Populus grandidentata or "big-tooth aspen". Bigtooth aspens are dioecious, medium-sized deciduous trees with straight trunks and gently ascending branches.Heights at maturity are around 60–80 feet (18–24 m) with diameters of 8–10 inches (20–25 cm).
A male clonal organism, Pando has an estimated 47,000 stems (ramets) that appear to be individual trees but are not, because those stems are connected by a root system that spans 42.8 ha (106 acres). Pando is the largest tree by weight and landmass and the largest known aspen clone.
These trees are able to grow in the desert due to springs of water recharged by wet uplands. Finally, alpine uplands known as "the Bowl" exceeding elevations of 7,000 ft (2,100 m) are covered with denser forests of ponderosa pine , southwestern white pine , and douglas-fir , with small stands of aspen .
Kitch-iti-kipi is an oval pool measuring 300 by 175 feet (91 m × 53 m) and is about 40 feet (12 m) deep with an emerald green bottom. [4] From fissures in underlying limestone flows 10,000 US gallons per minute (630 L/s) of spring water throughout the year at a constant temperature of 45 °F (7 °C). [4] [2]