11(10). Style usually 0.7-1.7 mm. long; leaves generally glabrous by the time 

 they are fully expanded; plants sometimes dwarf, rarely to 4 m. 

 tall 25. S. phylicifolia. 



11. Style to 0.5 (rarely to 0.8) mm. long; leaves typically reddish-strigillose 



beneath but sometimes more conspicuously hairy or even glabrous; 

 plants robust, mostly more than 4 m. tall 24. S. Scouleriana. 



12(10). Leaves 5 or more times as long as wide, usually narrowly lanceolate but 

 sometimes oblanceolate; twigs very glaucous 22. S. Geyeriana. 



12. Leaves not more than 4 times as long as wide, typically elliptic but sometimes 



oblong-lanceolate or narrowly obovate; twigs usually strongly 

 pubescent (13) 



13(12). Style 0.5-0.8 mm. long; scales light- to dark-brown or sometimes black- 

 ish 15. S. glauca. 



13. Style short, to about 0.4 mm. long; scales yellowish to light-brown 



21. S. Bebbiana. 



14(9). Shrub to about 4 m. tall; branchlets usually dark-purple (plum-colored) 

 and very glaucous 16. 5. irrorata. 



14. Shrubs or trees; branchlets yellowish to dark-brown, not or but slightly glau- 



cous (15) 



15(14). Leaves oblanceolate to linear, acute to short-acuminate; stamens 2, the 

 filaments glabrous 17. 5. lasiolepis. 



15. Leaves prevailingly lanceolate to oblong-lanceolate and long-acuminate; 



stamens more than 2, the filaments hairy toward the base 



8. S. laevigata. 



16(7). Lower leaf surface green, slightly paler than the upper surface but seldom 

 distinctly glaucous (17) 



16. Lower leaf surface decidedly paler than the upper surface, usually glaucous 



(19) 



17(16). Petioles and leaf bases glandular 5. S. lasiandra. 



17. Petioles and leaf bases not glandular (18) 



18(17). Shrub; twigs brown; leaves seldom more than 4 times as long as wide, 

 rounded to subcordate at base, obtuse to short-acuminate at apex 

 19. 5. myrtillifolia. 



18. Tree; twigs yellowish; leaves much more than 4 times as long as wide, attenu- 



ate at base, long-acuminate at apex 3. 5. Gooddingii. 



19(16). Leaves all (or some of them) conspicuously and sharply long-acuminate 

 at apex; stamens 3 or more, the filaments hairy toward the base; 

 usually trees (20) 



19. Leaves rounded to short-acuminate at apex (23) 



20(19). Petioles slender, those of the larger leaves usually 10 mm. long or more; 

 leaves typically not more than 3 times as long as wide, not shiny 

 above 4. S. amygdaloides. 



20. Petioles stout, usually less than 10 mm. long; leaves commonly at least 4 times 



as long as wide, often shiny above (21 ) 



21(20). Margins of the leaf blades and the petioles near the apex bearing con- 

 spicuous yellowish glands; branchlets and the upper surface of the 

 leaves very shiny 5. S. lasiandra. 



21. Margins of the leaf blades and the petioles not or not conspicuously glandular; 



branchlets and the upper surface of the leaves not or only moder- 

 ately shiny (22) 



756 



