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The species of willows are readily propagated by cuttings. It has been suggested that the brittleness at base of twigs of some species, notably the black willow (S. nigra), is an adaptation to facilitate the natural distribution of the species. Certain it is that twigs broken from the tree by the wind are carried down streams and, becoming anchored in the muddy banks, grow readily. It is one of the most aggressive trees in occupying such places. Willows may also be propagated by seed. The seeds are very small and contain a green and short-lived embryo. A very short exposure of the seeds to the air will so dry them out that they will not germinate. The safest way to secure seedlings is to plant the seeds as soon as the capsule opens.
The species of willows are readily propagated by cuttings. It has been suggested that the brittleness at base of twigs of some species, notably the black willow (S. nigra), is an adaptation to facilitate the natural distribution of the species. Certain it is that twigs broken from the tree by the wind are carried down streams and, becoming anchored in the muddy banks, grow readily. It is one of the most aggressive trees in occupying such places. Willows may also be propagated by seed. The seeds are very small and contain a green and short-lived embryo. A very short exposure of the seeds to the air will so dry them out that they will not germinate. The safest way to secure seedlings is to plant the seeds as soon as the capsule opens.
S. aglaia, Hort.=S. daphnoides.—S. amygdalina, Linn. (S. triandra. Linn.). Usually shrubby, to 12 ft.: branchlets glabrous, rarely slightly silky: lvs. lanceolate, glabrous, pale green or bluish below, to 5 in. long: fls. shortly before or with the lvs.; stamens 3; ovary long-stalked, glabrous. Eu.—S. Bakeri, Seemen, is probably a form of S. lasiolepis.—S. Bockii, Von Seemen. An ornamental dwarf species: lvs. oblong or oval, 1/4-1/2 in. long, mucronate, dark green and glabrescent above, silvery with silky appressed hairs beneath: aments 1-2 in. long, produced in Oct. and Nov. before the fall of the lvs. China.—S. chrysocoma. Dode, is a hybrid between S. babylonica and S. vitellina.—S. daphnoides, Vill. Ten to 20 ft. high: twigs violet: lvs. narrow-oblong or linear-lanceolate, very acuminate. 3-6 in. long.—S. Hankensonii, Dode. Apparently a natural hybrid between a species of the group of S. nigra and one of the group of S. babylonica.—S. heterandra, Dode. Possibly hybrid between a species of the S. purpurea group and one allied to S. pentandra. Shrub: lvs. lanceolate-obovate or narrowly lanceolate, 3—4 in. long, remotely serrate, glabrous, light green above, whitish- glaucous beneath: male aments about 1 3/4 in. long: Caucasus.—S. hypoleuca, Seemen. Shrub, to 10ft.: lvs. elliptic to lanceolate, acute, glabrous at maturity, glaucous below, 1-2 in. long: aments with the lvs. 1-2 in. long. Cent. W. China.—S. japonica, Thunb. (S. babylonica var. japonica, Anderss.). Shrub, to 6 ft.: lvs. ovate-oblong to lanceolate, remotely serrate, glabrous, grayish green beneath, to 3 in. long: aments slender, 2 1/2-3 1/2 in. long; ovary glabrous. Japan.— S.lasiolepis, Benth. Arroyo Willow. Shrub or tree, 8-25 ft. high: lvs. oblong, suborbicular, obovate or linear acute, obscurely serrulate, 1 1/2-5 in. long: aments appearing before the lvs., sessile, densely silky-tomentose in the bud, suberect: caps. glabrous or puberulent, short-pedicelled. Calif.—S. lispocladus, Dode. Lvs. ovate-lanceolate, about 2 1/2 in. long, serrate, light green and shining above, whitish glaucous beneath: male aments appearing late. Caucasus.— S. magnifica, Hemsl. Shrub, to 20 ft.: lvs. oval to obovate, shortly and obtusely acuminate, glabrous, pale beneath, to 8 in. long and to 5 in. wide; petiole purplish: staminate aments to 7 in., pistillate to 11 in. long. W. China. A remarkable willow, but tender N. J. H.S. 39. p. 137, fig. 148.—S. Matsudana, Koidsumi (S. babylonica var. pekinensis, Henry). Tree, to 40 ft.: branchlets ascending or pendulous, greenish: lvb. narrowly lanceolate, serrulate, glabrous, 2-4 in. long: aments with the lvs., about 1/2 in. long. N. E. Asia.—S. Medemii, Boiss., of the Armenia-Persia region is an upright species 12 ft. and more high with oblong somewhat serrate lvs. abruptly pointed.—S. Medwedewii, Dode. Shrub or small tree: lvs. very narrow, up to 4 in. long: female aments appearing late, cylindric, 1 1/4 in. long. Caucasus.—P. oxica, Dode. Lvs. large, glaucescent, giving the tree a bluish appearance. Cent. Asia.—S. persica, Boiss. Similar to P. babylonica. Trunk pale ashy gray or brownish: lvs. very shortly stalked, somewhat falcate, long-acuminate, serrulate. Persia.—S. Rehderiana, Schneid. Shrub, to 10 ft.: branchlets sparingly hairy or glabrous: lvs. lanceolate, crenulate, whitish and silky beneath, with yellow midrib, 2-5 in. long: aments precocious, about 1 in. long; anthers purple at first; ovaries glabrous. W. China. —S. renecia is a hybrid, of which S. cinerea is a parent.—S. Tominii, Dode. Tree with spreading branches: lvs. obovate to lanceolate, 3 1/3- 4 in. long or more, remotely serrate: male aments at first conical and rosy at apex, afterward ovate-cylindric, 3/4 in. long. W. Asia.—S. triandra, Linn.=S. amygdalina.—S. Wallichiana, Anderss. Shrub or small tree: lvs. ovate- to oblong-lanceolate, entire, silky beneath like the young branchlets, 2-3 in. long: staminate aments 1 in. long, pistillate 3—5 in.: caps slender, silky. Himayalas, Cent. and W. China.—S. zygostemon. Hook. f. & Thorn. Probably a natural hybrid between S. purpurea and S. Medemii.—S. Wentworthii, Hort., is described as a tall upright rapid-growing willow with bright red bark: botanical position to be determined.
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