Salicaceae 363 



bifid; capsules l-locu!ar, 2-valved; seeds usually many, siiky-comose. More than 300 species, chiefly in the temperate and 



cooler regions of the N. Hemisphere, a few in S. America but none elsewhere in the S. Hemisphere. 



lA. Staminate flowers with 2 glands. 



2 A. Stamens 3-5; bracts yellowish, deciduous in the pistillate flowers. 



3A. Bud-scales with free imbricate margins 1- S. chaenomeloides 



3B. Bud-scales united on the margins 2. S. subjragilis 



2B. Stamens 2. 



"lA. Erect shrubs or trees; leaves 4—15 cm. long, lanceolate, acuminate. 

 5A. Pistillate flowers with 2 glands; leaves glabrous. 



6A. Spikes about 2 cm. long; leaves and branchlets green when dried; branchlets slender, often twisted; cultivated. 



3. 5. matsudana Cv. Tortuosa 

 6B. Spikes not over 1.5 cm. long, densely flowered; leaves and bratichlets often dark brown when dried; branchlets rather thick; 



indigenous 4. 5. eiiocarpa 



5B. Pistillate flowers with 1 gland; leaves usually pubescent. 

 7A. Ovary glabrous. 



8A. Leaves linear-lanceolate; branchlets slender, drooping; styles short; cultivated 5. 5. babylonica 



8B. Leaves lanceolate to broadly so; branchlets not drooping; styles nearly absent; indigenous 6. 5. serissacjolia 



7B. Ovary pubescent. 



9A. Leaves pale green beneath 7. 5. yoshinoi 



9B. Leaves glaucous beneath. 



lOA. Pedoles 2-5 mm. long; branchlets densely puberulent 8. S. jessocnsis 



lOB. Petioles 5-10 mm. long; branchlets glabrous or glabrescent 9. 5. kpreensis 



4B. Dwarf alpine subshrub; leaves obovate to rounded, rounded at apex, 6—12 mm. long, subentire 10. 5. pauciflora 



IB. Staminate flowers with 1 gland. 

 HA. Stamens free. 



12A. Dwarf alpine shrubs; branchlets short, creeping, much-branched; aments terminal on short leafy branchlets. 

 13A. Styles long; leaves 2-4 cm. long, the petioles 5-25 mm. long. 



14A. Leaves with prominently raised reticulate veinlets beneath U.S. hidakflmontana 



14B. Leaves without prominently raised veinlets beneath. 



15A. Leaves elliptic to oblong; bracts narrowly ovate, subobtuse, pubescent on both sides; alpine in Honshu. 12. S. nakflmiirana 

 15B. Leaves elliptic to ovate-rounded; bracts elliptic, rounded at apex, densely pubescent; alpine in Hokkaido. 13. 5. yesoalpina 



13B. Stales short; leaves 1-3 cm. long, the petioles 2-5 mm. long 18. 5. paludicola 



12B. Shrubs or trees of mountains and lowlands, with erect or ascending stems and branches. 

 16A. Styles very short or absent. 



17A. Much-branched large shrubs; leaves 4-8 cm. long, 2-4 cm. wide, the petioles 1-2.5 cm. long. 



18A. Sapwood of young branches with short, elevated, longitudinal striations; leaves pubescent beneath 14. 5. bal{l{o 



18B. Sapwood of young branches without striations. 



19A. Adult leaves pubescent beneath 15. 5. hultcnii 



19B. Adult leaves glabrous on both sides 16. 5. taraikensis 



17B. Small shrubs; the branches erect, slightly branched; leaves 2.5-4 cm. long, 5-12 mm. wide, the petioles 1-5 mm. long. 



1 7. S. siibopposita 

 16B. Styles distinct, longer than the stigma. 

 20A. Spikes terminal on short leafy branchlets. 



21A. Leaves rounded with a mucro or very short-acute at apex, usually distinctly toothed; ovary glabrous or white-pubescent. 



19. 5. reinii 



21B. Leaves rounded to obtuse, minutely and sometimes obscurely toothed; ovary yellow-brown villous 20. S. hidewoi 



20B. Spikes lateral, sessile or nearly so. 



22A. Leaves oblong to broadly elliptic, acute or short-acuminate. 



23A. Leaves 10-20 cm. long, narrowly oblong to elliptic, often yellowish pubescent; ovary nearly sessile 21. S. jtititra 



23B. Leaves 3-8 cm. long, elliptic, oblong, or obovate-cUiptic, rarely lanceolate. 



24A. Young branchlets and the underside of leaves yellow-brown pubescent; leaves elliptic or oblong; ovary stiped. 



22. S. viilpina 

 24B. Young branchlets and other parts white-pubescent or glabrous. 



25A. Leaves broadly cuneate to shallowly cordate at base; ovary long-stiped 23. 5. shiraii 



25B. Leaves acute to obtuse at base; ovary short-stiped. 



26A. Leaves ovate-oblong; fruiting spikes 3-5 cm. long; stamioate spikes 2—2.5 cm. long 24. S. rupijraga 



26B. Leaves lanceolate; fruiting spikes 6-12 cm. long; staminate spikes 3-8 cm. long 25. 5. japonica 



22B. Leaves lanceolate, gradually narrowed and acuminate. 



27A. Leaves glabrous from the beginning; branchlets and leaves glaucous 26. 5. rorida 



27B. Leaves pubescent at least at first. 

 28A. Leaves silky-pubescent beneath. 



29A. Branchlets thick, villous; flower-buds large, densely arranged on the branchlets; leaves silky-vUlous beneath. 



27. S. /(iniiyanagi 

 29B. Branchlets more slender, silvery-pubescent; flower-buds rather loosely arranged; leaves silvery-pubescent. 



28. S. petsiisu 



28B. Leaves appresscd-puberulent bencadi 29. 5. sachalinensis 



1 1 B. Stamens with the filaments united at base. 

 30A. Stamens 2 with filaments connate beneath. 



31A. Styles absent or very short and less than half the length of the ovary; filaments pilose; leaves lanceolate to narrowly so. 



