Populus, continued 



Populus deltoidea vangeerti. VAX GEERT'S GOLDEN 

 POPLAR. A form with yellow foliage. One of the best 

 of yellow -leaved trees, generally holding its color 

 throughout the growing season. 



P. grandidentata. LARGE-TOOTHED ASPEN. A tree 

 with stiff but slender branches, forming a round-topped 

 crown. Distributed from Nova Scotia to Minnesota, 

 southward to Delaware and Iowa, and in the Allegheny 

 Mountains to North Carolina and Tennessee. Leaves 

 ovate, coarsely toothed, dark green, borne on slender 

 flattened petioles. Flowers in drooping catkins in early 

 spring. 



P. nigra fastigiata. LOMBARDY POPLAR. A tall col- 

 umnar tree of picturesque and veryformal aspect. One 

 of the characteristic trees of Lombardy and other parts 

 of Italy. Widely planted; a very rapid-growing and 

 hardy tree. Leaves triangular, the borders serrate, 

 dark green, borne on flattened petioles, moving freely 

 in the wind. 



P. tremula. EUROPEAN ASPEN. A tree with ascend- 

 ing or spreading branches, forming an open pyramidal 

 head. Widely distributed in Europe and Asia. Leaves 

 oval or nearly round, dark green above, whitened be- 

 neath, the margins toothed, borne on slender flattened 

 petioles, moving or trembling with the slightest current 

 of air. Flowers in great profusion in early spring, 

 borne in long pendent catkins. Blossoms before other 

 varieties of the Poplars and on this account, when 

 growth is anxiously looked for, is much esteemed. 



P. tremula pendula. WEEPING EUROPEAN ASPEN. 

 The best weeping tree among the Poplars. Branches 

 long and very pendulous, making a tree of much grace. 

 Grafted on straight, erect stems. 



P. iremuloides. AMERICAN ASPEN. A tree with slen- 

 der, somewhat pendulous branches, forming a narrow 

 round head. Distributed from Labrador to Alaska, 

 southward to Pennsylvania, Missouri, New Mexico 

 and California. Leaves ovate, serrate, dark green, borne 

 on slender flattened petioles, moving with the slightest 

 currents of air. Flowers in drooping catkins in early 

 spring. 



Primus The Plums 



Hardy trees of great beauty, thriving in almost 

 any soil. The Wild Plum is successfully used in 

 groups or colonies in conjunction with shrubs, and 

 occasionally is seen as a specimen tree on the 

 lawn. The Purple- leaved Plum is especially 

 adapted for use in formal gardens and in producing 

 striking foliage effects. 



Prunus americana. WILD PLUM. A small tree with an 

 intricately branched broad head. Distributed from 

 New York to Florida, westward to Montana and Texas. 

 Leaves oval or obovate, finely serrate, dark green and 

 rugose, turning yellow and bronze in autumn. Flowers 

 appearing in early spring, white, produced in great 

 profusion. Fruit nearly round, three-quarters of an 

 inch wide, reddish. Very showy when in flower, and 

 frequently cultivated as an ornamental. 



P. pissardi. PURPLE- LEAVED PLUM. A handsome 

 small tree of garden origin, with purple foliage. Very 

 hardy and retaining its color throughout the summer. 

 In spring the blush-pink flowers are borne in great 

 profusion, harmonizing with the color tone of the un- 

 folding leaves. One of the best of purple-leaved trees, 

 the hot sun not affecting the leaves. 



Ptelea The Hop Trees 



Small hardy trees thriving in any well -drained 

 soil. They are interesting objects on account of the 

 clusters of wafer-like seeds. Most effective when 

 planted in groups or colonies. 



Ptelea trifoliata. HOP TREE, OR WAFER ASH. A 

 small round-headed tree, or more frequently a large 

 shrub, with short spreading or erect branches. Occurs 



naturally from Ontario to Florida, and westward to 

 Minnesota and Texas. Leaves compound, the three 

 ovate or oblong leaflets dark green and lustrous, turn- 

 ing yellow in autumn. Flowers greenish white, in com- 

 pound cymes, appearing in spring. Fruit wafer-like, 

 the seed surrounded by a papery marginal wing. Fre- 

 quently planted in parks and gardens. 



P. trifoliata aurea. GOLDEN HOP TREE. Foliage gol- 

 den yellow, the bright color retained throughout the 

 summer. 



Pods and buds of Paulownia impeiklis (see page 33) 



Pterocarya The False Walnut 



A rapid-growing tree with large compound leaves 

 and long pendulous racemes of curious winged 

 fruits. It thrives best in rich, moist soil, and is 

 hardy as far north as Missouri and Massachusetts. 



Pterocarya fraxinifolia. FALSE WALNUT A handsome 

 tree with spreading branches, frequently with several 

 stems from the base, native of Western Asia. Leaves 

 rich dark green, consisting of 11 to 25 leaflets. Fruits 

 light green, drooping in graceful racemes 12 to 15 

 inches long. Rare and interesting. 



Pterostyrax The Japanese 

 Silver Bell 



A handsome ornamental tree closely related to 

 the Halesias. It thrives best in moist sandy loam, 

 and needs protection from cold winds in the North. 

 In the Middle and Southern States, where it is 

 quite hardy, it is justly prized for its wealth of 

 showy flowers. 



Pterostyrax hispida (Halesia hispida}. JAPANESE 

 SILVFR BELL. A small tree with graceful spreading 

 branches, forming a narrow head. Native of Japan. 

 Leaves oblong, light green above, pale beneath, turn- 

 ing yellow in autumn. Flowers fragrant, creamy white, 

 resembling the Deutzias, borne in drooping panicles 

 early in summer. Fruit covered with bristly hairs. 



35 



