SALICACEAE. 311 



Leases coarsely silky when young, glabrate in age. 



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



21. S, fl uviatilis. 

 Leaves narrowly linear, bracts lanceolate, acute. 



22. S. linearifolia. 

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



Pedicels in fruit less than i 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 i 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. 



1 6. 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. hiteosericea. 

 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. S. 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. 



