CaPBIFO] i.\( l \l . 



351 



V. pauciflorum. 

 Opulus nanum. 

 (2). V. Opulus. 



V. Sargentii. 



V. rufidulum. 



19. 



14. Dwarf. 15. 

 Tall. 16. 



15. Buds round-ovoid: native. 

 Buds oblong-ovoid: cultivated. 



16. Twigs glabrous. 

 Twigs more or less bristly. 



17. Buds very red-scurfy. 

 Buds brown, becoming lead-colored. 18. 



18. Twigs often short, rigidly spreading: buds smooth. 

 Twigs mostly elongated and flexuous. 20. 



19. Southern: buds very small. V. obovatum. 

 Northern: buds nearly as in the next. V. prunifolium. 



20. Buds smooth, quickly lead-colored. (3). V. Lentago. 

 Buds rather loosely peltately brown-scurfy. 21. 



21. Twigs dull: northern. V. cassinoides. 

 Twigs rather glossy: southern. V. nudum. 



22. Twigs and buds hispid. 23. 



Not hispid, though sometimes sparingly hairy. 24. 



23. Twigs very hairy, rather stout (3-4 mm.). V. dilatatum. 

 Twigs sparsely hispid, slender (2-3 mm.). 



24. Bark freely exfoliating. 

 Bark not exfoliating. 25. 



25. Buds stalked, rather small or slender. 26. 

 Buds sessile, plump and rather large. 29. 



26. Bud-scales 4: buds appressed. 27. 

 Bud-scales often 6: buds plump, spreading. 



27. Lower scales short: twigs mostly pubescent. 



(4). V. acerifolium. 

 Lower scales often reaching the middle of the bud. 28. 



28. Twigs, and buds below, somewhat hairy. V. venosum. 

 Twigs and buds glabrate. (5). V. dentatum. 



29. Twigs purple. V. hupehense. 

 Twigs olive, becoming gray. 30. 



30. Lower scales nearly half the length of bud. V. theiferum. 

 Lower scales nearly as long as bud. V. Wrightii. 



V. erosum. 

 V. molle. 



V. pubescens. 



