Populus tremuloides

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Standard Cyclopedia of Horticulture

Populus tremuloides, Michx. American Aspen. Fig. 3129. Small weak tree, abundant northward and springing up in clearings: lvs. small, roundish ovate with a slightly tapering or a truncate or sometimes even a semi-cordate base, abruptly contracted to a short usually apiculate point, finely crenate-serrate, downy when young but becoming smooth on both surfaces, the petioles long and slender so that the foliage twinkles in the slightest breeze: catkins drooping, with silky deeply 3-5-cleft scales or bracts, the pistillate becoming 3-4 in. long: caps, oblong-conical, not hairy or pubescent: the species is very like P. tremula, but the lvs. are usually less circular and more abruptly acuminate, the margins are small-crenate rather than deeply toothed, and the lvs. are green on the under side. Generally distributed in N. Amer., north of Pa., and Ky.( and extending to Mex. in the mountains. S.S. 9:487.—The bark of the young trees is whitish gray, rendering the saplings very conspicuous in a coppice. In woods the tree is said sometimes to reach a height of 100 ft., but it is usually much smaller than this. The far western form has been separated as var. aurea, Daniels (P. aurea, Tidest.). Several lf.-varie- ties have been described. Var. pendula, Schneid., is a drooping or weeping form. P. cercidiphylla, Brit., is a form or a closely related species in Wyoming with small entire or undulate lvs. which bear a peculiar concave gland on the blade on either side of the petiole attachment. P. atheniensis is an old name said to have been given from a N. American Athens, and as it is a very early name it is used by Koch in place of P. tremuloides. The P. graeca, of some authors perhaps applies to this species through some error; see No. 5. The name P. graeca appears to have originated with Aiton, who apparently gave the name because he found it cult, as the "Athenian poplar;" it is probably the same as P. atheniensis, Ludw. CH


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