824 Yearbook^ of Agriculture 1949 



yellowish, with an ill-smelling thin outer coat and large edible nut. Ginkgo is a living 

 fossil from China related to conifers and the sole survivor of its family, not found wild 

 but long perpetuated in cultivation in China and Japan around temples. Adapted to 

 moist temperate regions in eastern United States and Pacific coast. Especially suited as 

 a street tree because it is resistant to smoke, dust, wind, and ice, and free from insect 

 injury. Male trees are preferred, because of the disagreeable fruits of the female. Zone 4. 



F. Deciduous, leaves paired (opposite), not divided into leaflets (simple), Nos. 21-23. 



21. ROYAL PAULOWNIA, Paulownio, tomentosa (Thunb.) Steud. (paulownia, princess- 

 tree). Small to medium-sized, widely spreading tree with stout branches. Bark gray 

 brown with shallow fissures. Leaves paired, resembling those of catalpa, with leafstalks 

 3 to 8 inches long and large heart-shaped leaf blades 5 to 16 inches long, with edges 

 smooth or slightly 3-lobed, light green, slightly hairy above and densely hairy beneath. 

 Flowers large and very showy, violet, about 2 inches long, fragrant, borne in dense 

 upright clusters 6 to 10 inches long in spring before the leaves appear. Fruiting capsules 

 egg-shaped, pointed, 1 to 1/a inches long, brown, remaining on tree in winter. Native 

 of China. Planted as an ornamental for the showy violet flowers and large leaves in 

 eastern United States north to New York but not hardy where the winters are ^severe. 

 Grown also in Pacific States. Thrives in rich moist soil and naturalized as a "weed" 

 tree in waste places in Eastern States. Zone (5). 



22. NORWAY MAPLE, Acer platanoides L. (Schwedler maple is a variety). Medium- 

 sized to large spreading tree with rounded symmetrical crown of dense foliage. Bark 

 dark, with narrow ridges and furrows. Leafstalks about 3 inches long, with milky juice. 

 Leaves paired, heart-shaped, 3 to 7 inches in diameter, 5-lobed, with few pointed teeth, 

 smooth, bright green, turning yellow in fall. Flowers yellowish green, abundant in many- 

 flowered clusters in spring before the leaves develop. Key fruits paired, long-winged, 

 1/2 to 2 inches long, spreading horizontally. Native across Europe from Norway to 

 Caucasus. Widely planted in eastern United States and in Pacific and Rocky Mountain 

 regions. Fast growing, tolerant of city smoke and dust, and relatively free from insect 

 pests and diseases. The popular variety Schwedler maple has bright red leaves when 

 young, changing to dark green. Zone 3. 



23. PLANETREE MAPLE, Acer pseudoplatanus L. (sycamore maple, "sycamore" in Eu- 

 rope ) . Large spreading tree with rounded crown. Bark with broad flaky scales. Leaf- 

 stalks 3 to 4 inches long. Leaves paired, heart-shaped at base, 3 to 6 inches in diameter, 

 5-lobed with the lobes pointed and coarsely toothed, dark green above, pale and smooth 

 or slightly hairy beneath. Flowers yellowish green, distinctive, hanging in long, narrow 

 clusters 3 to 7 inches long in spring. Key fruits paired, long-winged, 1 1 A to 2 inches long. 

 Native of Europe and western Asia, where it is an important timber and shade tree. 

 Planted as a shade tree in Pacific States and in Eastern States except coldest regions, 

 but not as hardy as Norway maple. Rapidly growing and suited to exposed situations. 

 Zone 5. 



G. Deciduous, leaves paired (opposite), divided into leaflets (compound), Nos. 24 and 25. 



24. AMUR CORKTREE, Phellodendron amurense Rupr. Large, aromatic tree with low, 

 spreading branches and rounded crown. Bark light gray, corky, deeply fissured, conspicuous 

 in winter. Twigs yellowish gray. Leaves paired, compound, 6 to 12 inches long. Leaflets 

 5 to 13, oval, 2 to 4 inches long, long-pointed, with minute dots, shiny dark green above, 

 light green and smooth or hairy beneath, turning yellow in fall. Flowers small, yellowish 

 green, l /4 inch long, in clusters 2 to 8 inches long in early summer. Fruit YB inch in diameter, 

 black, 5-seeded, ornamental, with odor of turpentine. Native of northern China and 

 Manchuria. Hardy in most temperate regions of United States. Tolerant of city conditions 

 and relatively free from insects and disease. Zone 3. 



25. HORSECHESTNUT, Aesculus hippocastanum L. (common horsechestnut). Medium- 

 sized to large spreading tree with rounded crown. Bark brownish, thin, fissured and scaly. 

 Leaves paired, compound, with leafstalks 3 to 7 inches long. Leaflets 5 to 7, spreading 

 nngerlike (palmate), elliptical, 4 to 10 inches long, wedge-shaped at base and broader 

 toward the abrupt point, toothed, dark green above, paler beneath. Flowers white with 

 red spots, about $4 inch long, in large showy upright clusters. Fruiting capsule 2 to 2 1 /? 

 inches in diameter, spiny, with 1 or 2 large inedible seeds. Native of Balkan Peninsula. 

 Widely planted across the United States and escaped from cultivation in the Northeast. 

 The showy flowers and large palmate leaves have made this species a popular ornamental 



14. Camphor-tree. 15. India-rubber fig. 16. Peppertree. 17. Silk-oak. 18. Carob. 

 19. Greenwattle acacia. 20. Ginkgo. 21. Royal paulownia. 22. Norway maple. 23. 

 Planetree maple. 



