92 SALICACEAE. 



Styles manifest, but short : leaves with lanceo- 

 late blades 3. 8. fragilis. 

 Pedicels less than 1 mm. long at maturity : stig- 

 mas sessile. 

 Branches erect or spreading : leaf-blades lanceo- 

 late. 4. 8. alia. 

 Branches drooping : leaf-blades linear-lanceolate. 5. 8. babylonica. 

 Filaments glabrous : bracts persistent. 6. S. cordata. 

 Capsules variously pubescent. 

 Filaments distinct. 



Capsules markedly pedicelled. 



Leaf-blades not densely pubescent beneath at ma- 

 turity. 

 Leaf-blades linear or linear-lanceolate. 



Filaments pubescent : capsules glabrate. 7. 8. interior. 



Filaments glabrous : capsules permanently 



pubescent. 8. 8. petiolaris. 



Leaf-blades oblong, elliptic or ovate-lanceolate. 9. 8. discolor. 



Leaf-blades densely white-pubescent beneath. 



Leaves with the blades white-tomentose beneath. 

 Mature pistillate aments 2-3 cm. long : leaf- 

 blades 5-10 cm. long. 10. 8. humilis. 

 Mature pistillate aments about 1 cm. long : 



leaf-blades 2-5 cm. long. 11. S. tristis. 



Leaves with the blades silvery-silky beneath. 12. S. sericea. 



Capsules subsessile. 13. 8. viminalis. 



Filaments united. 14. 8. purpurea. 



1. S. nigra Marsh. Tree becoming 40 m. tall, the twigs brown: leaf -blades 

 narrowly lanceolate, 6-12 cm. long, acute at both ends, or acuminate at the 

 apex, pale beneath: staminate aments with finely pubescent, blunt bracts: cap- 

 sules 4 or 5 times as long as the pedicels. — Common, in low grounds and along 

 streams. — Black-willow. 



2. S. lucida Muhl. Shrub, or tree becoming 6 m. tall, the twigs yellowish- 

 brown: leaf -blades lanceolate to ovate-lanceolate or ovate, 6-12 em. long, 

 acuminate : staminate aments 2-5 em. long, stout : capsules ovoid, 4.5-6.5 mm. 

 long. — Lower Susquehanna valley. Eather rare, in moist soil. — Schists. — 

 Shining-willow. 



3. S. fragilis L. Tree becoming 25 m. tall, the twigs brown : leaf -blades lanceo- 

 late, 8^15 cm. long, glabrous, more or less glaucous beneath: capsules long- 

 conic, 4.5-5 mm. long. — Common, in low grounds and moist soil. Nat. of Eu. 



4. S. alba L. Tree becoming 30 m. tall, the twigs olive-green or yellow (blue 

 or bluish in S. alba coerulea) : leaf -blades often pale, lanceolate, 5-12 cm. long, 

 more or less silky (glabrous, and twigs brilliant-yellow, in S. alba vitellina) : 

 capsules ovoid, 3-5 mm. long. — Frequent, along streams, and about dwellings. 

 Nat. of Eu. — White-willow. 



5. S. babylonica L. Tree becoming 20 m. tall, the twigs greenish: leaf -blades 

 narrowly lanceolate, 8-12 cm. long, acuminate at the apex, tapering at the base: 

 capsules turgid, 2-3 mm. long or smaller. — Frequent, about dwellings, and 

 along streams. Nat. of Eu. — Weeping-willow. 



6. S. cordata Muhl. Shrub becoming 5 m. tall, the twigs mostly brown or 

 gray-brown: leaf -blades mainly oblong-lanceolate, 7-9 cm. long, green beneath: 

 staminate aments about 2 cm. long: pistillate aments 3-6 cm. long: capsules 

 ovoid. — Frequent, along streams. 



7. S. interior Eowlee. Shrub, or tree becoming 9 m. tall, the twigs brown to 

 green: leaf -blades mainly linear-lanceolate, mostly 6-10 cm. long, remotely 

 toothed, glabrous or nearly so: staminate aments 6-10 cm. long, with ovate to 

 obovate bracts : capsules conic or ovoid-conic. — Susquehanna valley. Common, 

 on the river shore and islands. — Schists. — Sand-bab willow. 



8. S. petiolaris J. E. Smith. Shrub becoming 4 m. tall, the twigs purplish: 

 leaf -blades lanceolate, 4—9 cm. long, acuminate at both ends, serrulate: stami- 

 nate aments slender, mostly less than 2 cm. long: capsules ovoid-oblong below 

 the beak, 4-6 mm. long, about twice as long as the pedicels. — N. M. Eather 

 common, in swamps and wet lands. — Saiidstones and shales, limestones. 



