826 Yearbook^ of Agriculture 1949 



and shade tree. Tolerant of city smoke but subject to insect attacks and disease. Zone 3. 

 H. Deciduous, leaves borne singly (alternate), divided into leaflets (compound), Nos. 

 26 to 32. 



26. CHINESE SCHOLARTREE, Sophora japonica L. (Japanese pagoda-tree). Medium- 

 sized tree with spreading branches and dense rounded crown. Bark gray, fissured. Twigs 

 dark green, smooth or nearly so. Leaves 6 to 10 inches long, compound. Leaflets 7 to 17, 

 narrowly oval, 1 to 2 inches long, short-pointed, with smooth edges, shiny dark green 

 above, pale and finely hairy beneath. Flowers yellowish white, T / 2 inch long, beanlike, in 

 loose showy clusters 6 to 1 2 inches long in late summer. Pods 2 to 3 inches long and YQ inch 

 in diameter, narrowed between the seeds. Native of China and Korea and cultivated around 

 temples in Japan. Planted in the southern half of the United States and hardy north to 

 New York. Especially suitable as a street tree because of its tolerance of city fumes, but 

 slow growing. Relatively free from insect pests and diseases. Zone 4. 



27. PERSIAN WALNUT, Juglans regia L. (English walnut). Medium-sized tree with 

 spreading branches and rounded crown. Bark smooth, silvery gray. Compound leaves 8 to 

 16 inches long. Leaflets usually 5 to 9, oblong, 2 to 5 inches long, pointed, with edges 

 usually smooth, bright green, nearly smooth. Male flowers in narrow clusters 2 to 4 inches 

 long. Nuts 1 j/2 inches in diameter including the green husk, thin-shelled, sweet and edible, 

 known as English walnuts. Native from southeastern Europe to Himalaya and China. 

 Planted as a nut tree in warmer parts of United States, especially in the Pacific States and 

 also in Southeastern States. Useful also as a shade tree. Zone (5). 



28. AILANTHUS, Ailanthus altissima (Mill.) Swingle ( tree-of-Heaven ailanthus, tree- 

 of-Heaven; A. glandulosa Desf.) . Medium-sized, coarsely branched tree with smooth, striped 

 bark. Leaves large, compound, 1 /a to 2/2 feet long, with 13 to 25 leaflets, short-stalked 

 and mostly paired, broadly lance-shaped, 3 to 5 inches long, long-pointed, with 2 to 4 

 teeth near base, each tooth with a gland beneath. Flowers small, greenish, }4 inch long, 

 in large clusters 6 to 10 inches long in summer, the male flowers with disageeable odor. 

 Fruits winged, 1 /a inches long, reddish brown, showy in fall. Native of China but widely 

 planted and naturalized as a "weed" tree in waste places in eastern United States, southern 

 Rocky Mountains, and Pacific States. Rapid growing, with handsome coarse foliage. Not 

 among the more desirable trees but successful in crowded city and smoky factory districts 

 where most other kinds will not thrive. Planted also in shelterbelts. Objectionable about 

 drains, springs, and wells, as the roots get into drains and both roots and leaves are 

 poisonous. Grows on a variety of soils from sand to clay and spreads rapidly by suckers. 

 Only seed-bearing plants should be propagated, because of the ill-scented male flowers. 

 Zone 4. 



29. PANICLED GOLDENRAIN-TREE, Koelreuteria paniculata Laxm. (China-tree, pride-of- 

 India, varnish-tree ) . Small, sparingly branched tree with rounded open crown. Leaves 

 once or twice compound, 6 to 15 inches long. Leaflets 7 to 15, oval, 1 to 3 inches long,, 

 coarsely and irregularly toothed, dark green and smooth above, paler and slightly hairy 

 beneath. Flowers bright yellow, small, /a inch long, in broad, showy clusters 8 to 14 inches 

 long in summer. Pods showy, bladderlike, egg-shaped, 1 ^2 to 2 inches long, pointed, with 

 papery walls, brown. Native of China, Korea, and Japan. Planted in Atlantic, southern, 

 central, Rocky Mountain, and Pacific regions of the United States but not hardy in the 

 colder regions. Drought-resistant, relatively free from insect pests and diseases, and 

 tolerant of alkali. Zone 5. 



30. CHINABERRY, Melia azedarach L. (chinatree, pride-of-China; umbrella chinaberry 

 or umbrella-tree is a variety). Small tree with spreading, hemispherical crown or, in the 

 umbrella chinaberry, with crowded branches forming a dense, flattened crown like an 

 umbrella. Bark furrowed. Leaves large, twice compound, 1 to 2 feet long. Leaflets many, 

 oval, 1 to 3 inches long, sharp-pointed, toothed or lobed, bright green, smooth. Flowers 

 purplish, YQ inch across, fragrant, in open clusters 4 to 8 inches long in spring. Fruit y& inch 

 in diameter, yellow, 1 -seeded. Native of Himalaya, Planted for shade and ornament in 

 southern United States north to Virginia and west to California. Naturalized in the South- 

 east. Rapidly growing but short-lived. Zone 7. 



31. SILKTREE, Albizia julibrissin Durazz. (silktree albizia, "mimosa," powder-puff- 

 tree ) . Small, widely branched tree with spreading, flattened crown. Bark blackish, nearly 

 smooth. Leaves twice compound, finely divided and fernlike or feathery, 6 to 15 inches 

 long, with 10 to 24 forks, each with 30 to 60 small, oblong, pointed, pale-green leaflets 

 YQ inch long. Flowers pink and showy, crowded in ball-like clusters 1 to 2 inches in 

 diameter in summer. Pods 4 to 6 inches long, flat, green to brown. Native from Persia to 

 China. Widely cultivated and escaped from cultivation in the Gulf and Atlantic States 

 and planted also in Pacific States. As the hardiest of a group of tropical and subtropical 

 leguminous trees, this ornamental is reminiscent of warmer regions. Zone 7 (5). 



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24. Amur corktree. 25. Horsechestnut. 26. Chinese scholartree. 27. Persian walnut. 

 28. Ailanthus. 



