1. =Xanthóxylum Americànum=, Mill. (NORTHERN PRICKLY-ASH. TOOTHACHE-TREE.) Leaves and flowers in sessile, axillary, umbellate clusters; leaflets 5 to 9, ovate-oblong, downy when young. Flowers appear before the leaves. Shrub, scarcely at all tree-like, with bark, leaves, and pods very pungent and aromatic. Common north, and sometimes cultivated. [Illustration: X. Clàva Hércules.] 2. =Xanthóxylum Clàva Hércules=, L. (SOUTHERN PRICKLY-ASH.) Leaflets 7 to 17, ovate to ovate-oblong, oblique at base, shining above. Flowers appear after the leaves. A small tree with very sharp prickles. Sandy coast of Virginia and southward; occasionally cultivated in the north. GENUS =13. PTÈLEA.= Shrub with compound leaves of three leaflets, greenish-white flowers in terminal cymes, and 2-seeded fruit with a broad-winged margin, somewhat like the Elm, only larger. [Illustration: P. trifoliàta.] =Ptèlea trifoliàta=, L. (HOP-TREE. SHRUBBY TREFOIL.) Leaflets ovate, pointed, downy when young. Flowers with a disagreeable odor; fruit bitter, somewhat like hops. A tall shrub, often, when cultivated, trimmed into a tree-like form. Wild, in rocky places, in southern New York and southward. GENUS =14. PHELLODÉNDRON.= Leaves opposite, odd-pinnate. Flowers dioecious; so only a portion of the trees bear the small, odoriferous, 5-seeded, drupe-like fruit. [Illustration: P. Amurénse.] =Phellodéndron Amurénse.= (CHINESE CORK-TREE.) Leaves opposite, odd-pinnate, 1½ to 3 ft. long; leaflets 9 to many, lanceolate, sharply serrate, long-acuminate. Flowers inconspicuous, dioecious, in loose-spreading clusters at the ends of the branches. The pistillate flowers form small, black, pea-shaped fruit, in loose, grape-like clusters, thickly covered with glands containing a bitter, aromatic oil, and remaining on the tree in winter. Medium-sized tree (20 to 40 ft.), with Ailanthus-like leaves which turn bright red in autumn, and remain long on the tree. Hardy as far north as central Massachusetts. ORDER =X. MELIÀCEÆ.= (MELIA FAMILY.) Tropical trees, including the Mahogany; represented in the south by the following: GENUS =15. MÈLIA.= Trees with alternate, bipinnate leaves. The flowers are conspicuous and beautiful, in large panicles, in the spring. Fruit in large clusters of berry-like drupes, with a 5-celled stone. [Illustration: M. Azédarach.] =Mèlia Azédarach, L.= (CHINA-TREE. PRIDE OF INDIA.) Leaves very large, doubly pinnate, with many obliquely lance-ovate, acuminate, smooth, serrate leaflets. Flowers small, lilac-colored, deliciously fragrant, in large axillary clusters. Fruit globular, as large as cherries, yellow when ripe in autumn; hanging on through the winter. A rather small (20 to 40 ft. high), rapidly growing, round-headed, popular shade-tree in the south, and hardy as far north as Virginia. Introduced from Persia. GENUS =16. CEDRÉLA.=