. 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, and a synopsis of the vegetable kingdom . 1918. PoDulus Sieboldii(X J4). 1412 POPULUS PORTO RICO grown here than the varieties with lobed and very white-bottomed (and sometimes variegated) leaves. Var. nlvea, Wesm. (P. nivea, Willd. P. arghitea,Hort.). This is the commonest form of white Poplar inthis country. It is known
. 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, and a synopsis of the vegetable kingdom . 1918. PoDulus Sieboldii(X J4). 1412 POPULUS PORTO RICO grown here than the varieties with lobed and very white-bottomed (and sometimes variegated) leaves. Var. nlvea, Wesm. (P. nivea, Willd. P. arghitea,Hort.). This is the commonest form of white Poplar inthis country. It is known by the snow-white under sur-faces of its foliage and the 3- or 5-lobed maple-likeleaves. It is far too frequent about old yards, where itsinveterate brood of suckers make it a perpetual nui-sance. It is sometimes called Silver Maple, from theresemblance of its foliage to that of the maple. As astreet tree in cities it is particularly offensive, for thecottony covering of the under side of the leaves and ofthe shoots holds soot and dust, and it looks repulsivelydirty. Useful for foliage effects in large 1919. Populus alba, var. canescens above, andvar. Bolleana below (X ^3 Var. can6scen8, Loudon. Fig. 1919. Leaves broad ornearly circular in general outline, prominently notchedbut not lobed, the under surfaces and the young shootsvery gray-woolly. This tree is met with horticultural value is not greatly different from thatof var. nivea. By some thought to be a hybrid of and P. Tremiila, ^ (). 1919. A very tall, narrow-topped tree, with cottonyIvs. rather more deeply lobed than those of the The tree was introduced into Europe in Turkestan, and it was named for Dr. C. Bolle, anarboriculturist. It bears about the same relation toPopulus alba that the Lonibardy Poplar bears to Pojm-hm nigra. Its fastigiate habit, combined with the whitefoliage and shoots, makes it a most emphatic tre
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