SALICACEAE. 



Capsule glabrous; filaments distinct. 



Branches not drooping; leaves lanceolate. 



Leaves glabrous on both sides. 5. .S. fragilis. 



Leaves silky on both sides when young. 6. 5. alba. 



Leaves linear-lanceolate ; branches drooping. 7. 5. Babylonica. 



Capsules tomentose ; filaments united; leaves oblanceolate. 8. S. purpurea. 



River-bank shrub, with linear-lanceolate leaves. 9. 5. ftuviatilis. 



Low arctic shrubs, with obovate or oval obtuse leaves. 



Leaves glabrous, stronglj' reticulated beneath. 10. 5. reticulala. 



Leaves densely tomentose silky beneath. n. S. vestita. 



%.%.%. Filaments glabrous; capsule tomentose or pubescent. 

 Stigmas sessile or very nearly so. 

 Leaves tomentose beneath. 



Leaves oblong-lanceolate, slender- petioled; aments expanding with the leaves. 



12. S. Bebbiana. 

 Leaves oblanceolate, short-petioled; aments expanding before the leaves 



Leaves 2' -4' long; fruiting aments about i' long. 

 Leaves i'-2' long; fruiting aments %' long. 

 Mature leaves glabrous or slightly silky beneath. 

 Leaves oblong or oblong-lanceolate, acute. 

 Leaves elongated-lanceolate, long-acuminate. 



Capsule short-pedicelled, i l A" long; leaves black in drying. 

 Capsule slender-pedi celled, 2"-$" long; leaves green in drying. 

 Style filiform, equalling or longer than the stigmas. 

 Leaves persistently tomentose or silky beneath. 



Arctic or alpine shrubs; aments unfolding with the leaves. 

 Fruiting aments i' or less long. 

 Pubescence silvery-silky. 

 Pubescence tomentose. 

 Fruiting aments 2' -3' long. 

 Low bog shrub; leaves oblong. 



Introduced tree ; leaves linear-lanceolate, long-acuminate. 

 Mature leaves glabrous beneath. 



Leaves 2' -3' long, shining above. 



Leaves ^'-2' long, dull; low arctic shrubs. 



Leaves oblong or lanceolate, short-petioled. 

 Leaves elliptic or broadly obovate, long-petioled. 



HCJJC^^ Filaments glabrous; capsule glabrous. 

 Large shrubs, with serrate or serrulate leaves. 

 Mature leaves glabrous. 



Leaves lanceolate or ovate -lanceolate, acuminate. 

 Shrubs. 



Leaves green both sides, narrow; capsules 2" -3" long. 

 Leaves very glaucous beneath, broad; capsules 3" -5" long. 

 Tree 3p-5o high. 

 Leaves elliptic, obovate or oblong, merely acute. 



Leaves glaucous beneath; capsule slender-pedicelled. 

 Leaves green both sides; capsule nearly or quite sessile. 

 Leaves densely silky-pubescent. 

 Low bog shrub, with entire glabrous leaves. 

 Low diffuse glabrous alpine and arctic shrubs. 



Leaves oblong or obovate, narrowed at the base; aments many-flowered. 

 Leaves orbicular, cordate at the base; pistillate aments few-flowered. 



13. 5". humilis. 



14. S. tristis. 



15. 5". discolor. 



1 6. S. sericea. 



17. S. peliolaris. 



18. ,5". argyrocarp 



19. 5. deserlormn. 



20. 5". glauca. 



21. 5". Candida. 



22. .S. z'iminalis. 



23. 5. phyllicifolia. 



24. S. Broicnii. 



25. S. arctica. 



26. S. cor data. 



27. S. glaucophylla. 



28. S. Missottriensis. 



29. 5. balsamifera. 



30. 5". Bar clay i. 



31. 5. adenophylla. 



32. S. myrtilloides. 



33. 5. Uva-ursi. 



34. .S. herbacea. 



i. Salix nigra Marsh. Black Willow. (Fig. 1173.) 



Salix nigra Marsh. Arb. Am. 139. 1785. 



A tree, with rough flaky dark brown bark, 

 attaining a maximum height of about 120 and a 

 trunk diameter of 3. Leaves narrowly lanceolate, 

 acute or acuminate at the apex, narrowed at the 

 base, short-petioled, serrulate, somewhat pubescent 

 when young, glabrous and green above, somewhat 

 paler, and sometimes pubescent on the veins be- 

 neath when mature, 2^ / ~5 / long, 2 // -9 // wide; 

 stipules various, persistent or deciduous; anients ex- 

 panding with the leaves, on short lateral branches, 

 the staminate i / -2 / long the pistillate 1/4 '-3' long 

 and spreading in fruit; stamens 3-7, distinct, their 

 filaments pubescent below; scales deciduous; stig- 

 mas nearly sessile; capsule ovoid, acute, glabrous, 

 about twice as long as its pedicel. 



Along streams and lakes, New Brunswick to west- 

 ern Ontario, Florida and California. Hybridizes with 

 S. alba. Wood soft, weak, light brown; weight pc-r 

 cubic foot 28 Ibs. April-May. 



Salix nigra falcata ( Pursh ) Torr. Fl. N. Y. 2: 209. 1843. 

 Sahxfalcata Pursh, Fl. Am. Sept. 2: 614. 1814. 



Leaves narrower, 2" -3" wide, falcate, green on both sides. Massachusetts to Florida. 



