3. =Sàlix frágilis=, L. (BRITTLE WILLOW. CRACK-WILLOW.) Leaves lanceolate, taper-pointed, smooth, glaucous beneath (slightly silky when young), serrate throughout; stipules half heart-shaped, usually large. Branches smooth and polished, very brittle at base. A tall (50 to 80 ft. high) handsome Willow, with a bushy head and salmon-colored wood; cultivated from Europe for basket-work, and extensively naturalized. Many varieties, hybrids between this species and the next, are very common. Among them may be mentioned the following: Var. _decipiens_, with dark-brown buds; var. _Russelliana_, with more slender, brighter, and more sharply serrate leaves, the annual shoots silky-downy toward autumn; var. _viridis_, with tough, pendulous branchlets, and firmer, bright green leaves. [Illustration: S. álba.] 4. =Sàlix álba=, L. (WHITE WILLOW.) Leaves lanceolate or elliptical-lanceolate, pointed, serrate, covered more or less with white silky hairs, especially beneath; var. _cærulea_ has nearly smooth leaves, at maturity of a bluish tint; stipules small and quite early deciduous. Catkins of flowers long and loose, on a peduncle; stamens usually 2; stigmas nearly sessile, thick, and recurved. May, June. A quite large tree, 50 to 80 ft. high, with thick, rough bark, usually having yellow twigs (var. _vitellina_); introduced from Europe and now quite common throughout. Branches very brittle at base. [Illustration: S. Babylónica.] 5. =Sàlix Babylónica=, Tourn. (WEEPING WILLOW.) Leaves linear-lanceolate, acuminate, finely serrate, smooth, glaucous beneath; stipules small, roundish, oblique, acuminate; branches pendulous. A large, gracefully drooping tree, so extensively cultivated for ornament as to seem native; from Europe. Var. _annularis_ (Ring-leaved Willow. Curled Willow) has the leaves coiled round into rings and spirals. [Illustration: S. lùcida.] 6. =Sàlix lùcida=, Mühl. (SHINING OR AMERICAN BAY WILLOW.) Leaves thickish, ovate-lanceolate, with a rounded base, a very long acuminate point, and a glandular petiole; when mature, smooth and shining on both sides. Twigs rather stout, polished, and dark green. Bark of trunk smooth. Fruiting catkins quite persistent. A beautiful small tree or shrub, 6 to 15 ft. high, of bushy form. New Jersey, north and westward. [Illustration: S. pentándra.] 7. =Sàlix pentándra, L.= (LAUREL-LEAVED OR BAY WILLOW.) Leaves ovate, taper-pointed, crenate, glandular, smooth, glossy, bright deep green on both sides, strongly fragrant when bruised. Catkins large, fragrant, golden-yellow, with 4 to 12 (commonly 5) stamens to each flower. June, after the leaves are expanded. A small handsome tree, 15 to 20 ft. high, from Europe, which should be more extensively cultivated in damp soils, as its form, flowers, and foliage are all beautiful. [Illustration: S. cordàta. Var. rufescens.]