. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1412 POPULUS PORTO RICO grown here thau the varieties with lobed and very white- bottomed (and sometimes variegated) leaves. Var. nivea, Wesm. {P, nicea, Willd. P. arghitea, Hort.). This is the commonest form of white Poplar in this country. It is known by the snow-white under sur- faces of its foliage and the
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1412 POPULUS PORTO RICO grown here thau the varieties with lobed and very white- bottomed (and sometimes variegated) leaves. Var. nivea, Wesm. {P, nicea, Willd. P. arghitea, Hort.). This is the commonest form of white Poplar in this country. It is known by the snow-white under sur- faces of its foliage and the 3- or 5-lobed maple-like leaves. It is far too frequent about old yards, where its inveterate brood of suckers make it a perpetual nui- sance. It is sometimes called Silver Maple, from the resemblance of its foliage to that of the maple. As a street tree in cities it is particularly offensive, for the cottony covering of the under side of the leaves and of the shoots holds soot and dust, and it looks repulsively dirty. Useful for foliage effects in large 1919. Populus alba, var. canescens above, and var. Bolleana below (X }4. Var. canescens, Loudon. Fig. 1919. Leaves broad or nearly circular in general outline, prominently notched but not lobed, the under surfaces and the young shoots very gray-woolly. This tree is met with occasionally. Its horticultural value is not greatly different from that of var. nivea. By some thought to be a hybrid of P. alba and P. Tretnula. Var. Bolle&.na,Lauch. (), Bolles'Poplar. Fig. 1919. A very tall, narrow-topped tree, with cottony Ivs. rather more deeply lobed than those of the var. nivea. The tree was introduced into Europe in 1875 from Turkestan, and it was named for Dr. C. Bolle, an arboriculturist. It bears about the same relation to Poptihis alba that the Lombardy Poplar bears to Popn- his nigra. Its fastigiate habit, combined with the white foliage and shoots, makes it a most emphatic tree, and there is great dan
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