The Poplar reference article from the English Wikipedia on 24-Jul-2004
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Poplar

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''This article is about woody plants of the genus Populus.


Poplar, Aspen, Cottonwood
image:poplartree.jpg
A poplar tree
Scientific classification
Kingdom:Plantae
Division:Magnoliophyta
Class:Magnoliopsida
Order:Salicales
Family:Salicaceae
Genus:Populus
Species
Many, see text

Populus is a genus of trees which includes the cottonwoods, poplars, and aspens, all of which are sometimes termed poplars.

Poplars are deciduous, and turn bright gold to yellow before their leaves fall. The leaves of many poplars, including cottonwood and quaking aspen, have laterally-flattened stems, so that breezes easily cause the leaves to wobble back and forth, giving the whole tree a "twinkling" appearance in a breeze.

Like willows, many poplars have very strong and invasive root systems, so they must not be planted too close to houses or waterpipes as they will crack walls and pipes in their search for moisture.

Poplars of the cottonwood section are often wetlands or riparian trees. The quaking aspen is one of the most important boreal broadleaf trees.

Classification