Small trees or shrubs with alternate, simple, deciduous, serrate leaves. Flowers large, 1 in. long, conspicuous, white, hanging, bell-shaped, monopetalous, 4-lobed; blooming in spring. Fruit with a single, rough, elongated, bony nut surrounded by a 2- to 4-winged coat; ripe in autumn. Wood light-colored, very hard and fine-grained. [Illustration: H. díptera.] 1. =Halèsia díptera, L.= (TWO-WINGED SILVERBELL TREE.) Leaves large (4 to 5 in. long), ovate, acute, serrate, softly pubescent. Fruit with 2 conspicuous, broad wings, sometimes with 2 intermediate narrow ridges. A small tree or a large shrub, wild in the south, and cultivated as far north as New York City. [Illustration: H. tetráptera.] 2. =Halèsia tetráptera, L.= (FOUR-WINGED SILVERBELL TREE.) Leaves smaller (2 to 4 in.), oblong-ovate, finely serrate. Fruit smaller, with 4 nearly equal wings. A small, beautiful tree, 10 to 30 ft. high, more hardy than Halesia diptera, and therefore cultivated occasionally throughout. Wild in Virginia and south. GENUS =59. SÝMPLOCOS.= Shrubs or small trees, with leaves furnishing a yellow dye. [Illustration: S. tinctòria.] =Sýmplocos tinctòria=, L'Her. (HORSE-SUGAR. SWEETLEAF.) Leaves simple, alternate, thick, 3 to 5 in. long, elongate-oblong, acuminate, nearly entire, almost persistent, pale beneath, with minute pubescence, sweet-tasting. Flowers 6 to 14, in close-bracted, axillary clusters, 5-parted, sweet-scented, yellow; in early spring. Fruit a dry drupe, ovoid, ½ in. long. A shrub or small tree, 10 to 20 ft. high. Delaware and south. ORDER =XXIX. OLEÀCEÆ.= (OLIVE FAMILY.) An order of trees and shrubs, mainly of temperate regions. GENUS =60. FRÁXINUS.= Trees with petioled, opposite, odd-pinnate leaves (one cultivated variety has simple leaves). Flowers often inconspicuous, in large panicles before the leaves in spring. Fruit single-winged at one end (samara or key-fruit), in large clusters; ripe in autumn. Some trees, owing to the flowers being staminate, produce no fruit. Wood light-colored, tough, very distinctly marked by the annual layers. The leaves appear late in the spring, and fall early in the autumn. * Flowers with white corolla; a cultivated small tree 8. * Flowers with no corolla. (=A.=) =A.= Leaves pinnate; leaflets petiolate; calyx small, persistent on the fruit. (=B.=) =B.= Fruit broad-winged, ¾ in. wide. South 5. =B.= Wings much narrower. (=C.= ) =C.= Branchlets round and pubescent 2. =C.= Branchlets round and smooth. (=D.=) =D.= Leaflets nearly entire 1. =D.= Leaflets serrate near tip, entire below 3. =C.= Branchlets, on vigorous growths, square 4. =A.= Leaves pinnate; leaflets sessile; no calyx. (=E.=) =E.= Native; wing of fruit rounded at tip 6.