DECIDUOUS 



POPULUS, continued 



P. monilifera; syn., Carolinensis. Carolina Poplar. (Mr) A quick - 

 growing variety with gray-green bark and bright green, heart-shaped foliage. 

 A desirable variety for screening unsightly buildings and for temporary plant- 

 ing to secure immediate effects. 



P. monilifera, var. Van Geertii. Van Geert's Golden Poplar. (Mr) 

 A form of P. monilifera, with bright golden yellow foliage, holding the color 

 well throughout the season. 



P. nigra, var. fastigiata. Lombardy Poplar. (L r) A well -known Italian 

 variety. An upright and extremely rapid grower, with small bright pale green 

 leaves, lighter beneath. Valuable for formal work in connection with build- 

 ings or gardens, and an excellent avenue or lawn tree. In the latter case its 

 tall, spiral form tends to break and relieve the rounded outlines of other trees, 

 which are likely to be in the majority in such planting. (See plate on page 54.) 



PRUNUS (See, also, Cerasus) 



P. Pissardii. Purple -leaved Plum. (S s) One of the most beautiful 

 hardy trees, and an ornament to any lawn from spring until late fall. During 

 May it is covered with blush-pink blossoms, which harmonize exquisitely with 

 the pinkish purple foliage of early spring. The purple foliage, not being 

 affected by the hot sun, deepens during the summer months and retains its 

 color late in November. 



P. triloba. Flowering Plum. (Ss) A desirable variety, usually grafted 

 on stems 5 to 6 feet in height, and used as a standard. See, also, Shrubs. 



PTELEA. Hop Tree 



Very choice lawn trees of small size, with handsome deep green, glossy trifoliate 

 leaves, which, if bruised, exhale a pleasant, hop-like odor. This odor is especially 

 noticeable in the seeds, which are borne in dense, showy clusters in late summer. 

 They are of easiest culture in any soil. The Golden variety is an introduction of 

 the first merit. 



P. trifoliata. Hop Tree. (Ds) A round-headed, loosely branched tree, 

 with glossy green foliage ; adorned in the fall with numerous clusters of light 

 green fruit-pods. Prefers a shaded position and moist soil. 



P. trifoliata, var. aurea. Golden Hop Tree. (Ds) One of the showiest 

 golden-foliaged trees in cultivation. The peculiar glossy surface of the foliage 

 gives an appearance that the leaves have been varnished. It is one of the 

 highest colored golden-foliaged plants, retaining its color all summer. White 

 flowers in June. 



PTEROSTYRAX 



P. hispidum ; syn., Halesia hispida. (Sm) An open-headed tree with 

 slender, spreading branches, bearing long racemes of white flowers in June. 



P. hispida; syn., Halesia. A very showy, open-headed tree with light 

 green foliage, and bearing in June drooping panicles of fragrant white flowers, 

 resembling those of the deutzia. 



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