SALICACEAE. 311 



Leaves coarsely silky when young, glabrate in age. 



Leaves linear-lanceolate ; bracts ovate or obovate, obtuse. 



21. S. fluviatilis. 

 Leaves narrowly linear, bracts lanceolate, acute. 



22. S. linearifolia. 

 Style evident, but short; leaves lanceolate. 5. S.fragilis. 



Pedicels in fruit less than 1 mm. long ; stigma sessile. 



Branches not drooping ; leaves lanceolate. 6, S. alba. 

 Branches drooping ; leaves linear-lanceolate. 7. S. Babylonica, 

 Filaments glabrous ; bracts persistent. 

 Mature leaves glabrous. 



Pedicels in fruit 1-3 mm. long; capsule 5-9 mm. long. 

 Length of leaf-blade less than three times it breadth. 



Mature leaves thin, dull. 8. S. balsamifera. 



Mature leaves thick, firm, dark green and shining above. 



9. S. glaucophylla. 

 Length of leaf-blade three times its breadth or more. 



Leaves dark green above ; young branches not light yellow. 

 Pedicels 2-4 times as long as the fuscous bracts; mature 



leaves slightly serrate. 10. S. Mackenziana. 



Pedicels not longer than the bracts ; mature leaves 

 strongly serrate. 

 Bracts pale; leaves not whitish beneath. 



11. S. cor data. 

 Bracts fuscous; leaves whitish beneath. 



12. S. Missouriensis. 

 Leaves yellowish green ; young branches light yellow. 



13. S. lutea. 

 Pedicels in fruit less than 1 mm. long; capsule 3-5 mm. long. 



14. S. acutidens. 

 Mature leaves densely silky-pubescent ; capsule subsessile. 



15. S. adenophylla. 



2. Very low shrubs with serrate or crenate, obtuse leaves ; filaments glabrous. 



Leaves oblong, obovate or cuneate. 



Low shrub with erect branches and closely serrate or crenate leaves. 



16. S. myrtillifolia. 

 Depressed shrub with distantly crenate or subentire leaves. 



17. S. Uva-ursi. 

 Leaves nearly orbicular. 18. S. herbacea, 



3. Low shrub with entire-margined leaves ; filaments glabrous. 19. S. myrtilloides, 



♦"Capsule silky or tomentose. 

 I. Filaments distinct. 



A. Capsule distinctly pedicelled, rostrate; style none or short. 

 a. Mature leav^. not densely hairy beneath. 

 Leaves linear or linear-lanceolate. 



Filan ents hairy; capsule slightly silky when young, in age glabrate. 

 Leaves finely and almost permanently silky. 



20. S. luteosericea. 

 Leaves coarsely silky when young, glabrate in age. 



Leaves linear-lanceolate; bracts ovate or obovate, obtuse. 



21. S. interior. 

 Leaves narrowly linear; bracts lanceolate, acute. 



22. S. linearifolia. 

 Filaments glabrous; capsule permanently hairy. 



23. S. petiolaris. 

 Leaves oblong, elliptic, or ovate-lanceolate. 



Bracts fuscous, obovate or cuneate, long-hairy. 



Mature leaves rather thin, obovate or oblanceolate, irregularly 

 or indistinctly toothed ; young branches glabrous or slightly 

 puberulent. 24. S. discolor. 



Mature leaves oblong, firm, dentate. 



Young branches densely hairy ; aments short and dense. 



25. ,5". eriocephala. 

 Young branches glabrous ; aments long, laxer. 



26. S. prinoides. 

 Bracts yellow, linear oblong or lanceolate. 



Pedicel scarcely longer than the elongated gland. 



27. S. latiuscula. 

 Pedicel much longer than the gland. 



