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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 4 



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16. Leaf blades 10-16 x 7-10 mm.; petals yellowish; ovary pubescence non-glandular. ... 

 .' 7. B. parvifolium. 



16. Leaf blades 16-38 X 11-19 mm.; petals deep purple; ovary pubescence gland-tipped. . 

 8. B. barbeyanum. 



17. Hypanthium densely stout-strigose; calyx lobes broadly ovate and imbricate 



29* B. strigosum. 



17. Hypanthium sparsely to moderately slender-strigulose or slender-strigose; calyx lobes 

 not imbricate 18. 



18. Pedicellar bracteoles 1-nerved, very early caducous; petals carmine to white with rose 

 margins; connective not at all prolonged ventrally at anther base. 16. B. gracilescens. 



18. Pedicellar bracteoles 3-nerved, persistent at least until anthesis; petals deep purple; 

 connective prolonged ventrally and free of anther more than 0.3 mm 19. 



19« Leaf blades 15-30x6-10 mm., above sparsely to moderately short-strigose; calyx 

 lobes narrowly acute, widened at extreme base 22. B. buancavelicae. 



19. Leaf blades 5-17 X 4—7 mm., above sparsely strigulose; calyx lobes rounded to broadly 

 acute, not expanded basally 24. B. naudinii. 



20. Hypanthium not invested by pedicellar bracts or bracteoles 26. 



20. Hypanthium closely invested by two or more large bracts which are persistent at least 

 until anthesis 21. 



21. Leaf blades usually wider than 6 mm., with 5 or more primary veins 23« 



21. Leaf blades 6 mm. or less wide, with 3 primary veins 22. 



22. Upper leaf surface densely covered with tubercles in 6 lines; floral bracts tuberculate 

 apically within; flowers 5-merous; anther pore about Vi or more as wide as anther base. 

 36. B. multi tuberculatum. 



22. Upper leaf surface sparsely fine-strigulose; floral bracts glabrous within; flowers 4- 

 merous; anther pore less than l / 2 as wide as anther base 30. B. jamesonii. 



23. Leaf blades 30-75 X 10-30 mm.; petals truncate, greenish-white; connective ventrally 

 scarcely prolonged and free of anther only 0.1-0.3 mm 12. B. racemosum. 



23. Leaf blades 11-27 x 7-12 mm.; petals acute to rounded, bright red to deep purple; con- 

 nective ventrally prolonged and free of anther 0.3-0.7 mm. (cf. 1. B. quinquenerve). 24. 



24. Leaf blades above densely fine-strigose 8-18/mm. J ; bracts thin; petals acute to nar- 

 rowly obtuse 2. B. campanulare. 



24. Leaf blades above moderately strigose or strigulose 4-7/mm. 2 ; bracts firm; petals ob- 

 tuse to rounded 25* 



25. Length/width ratio of leaf blade 2.1-2.5; floral bracts acute; calyx lobes not imbri- 

 cate ■ 3* B. benthamianum. 



25. Length/width ratio of leaf blade 1.2-1.7; floral bracts rounded; calyx lobes imbricate 

 1-1.5 mm 4. B. andreanum 



26. Trichomes, at least those of hypanthium and/or lower leaf surface, roughened 39« 



26. Trichomes all smooth 27. 



27. Flowers predominantly 4-merous 32. 



27. Flowers predominantly 5-merous (cf. 40. B. rosmarinif olium) 28. 



28. Upper leaf surface densely beset with tubercles in 4 lines at widest part of blade 

 (petal cilia gland-tipped) 38. B. markgrafii. 



28. Upper leaf surface merely strigose or strigulose to glabrous 29« 



29. Calyx lobes imbricate at anthesis; petal cilia glandtipped 29« B. strigosum. 



29« Calyx lobes not imbricate at anthesis; petal cilia non-glandular 30. 



30. Calyx lobes deltoid to oblong-ovate; anther pore more than Y 2 as wide as anther base. . 

 . . 37. B. lymphatum. 



30. Calyx lobes lanceolate; anther pore less than l / 2 as wide as anther base 31. 



31. Nodal setae of branchlets inconspicuous; dichasial peduncle drooping, slender; pedi- 

 cellar bracteoles caducous before anthesis 27. B. lindenii. 



31. Nodal setae of branchlets markedly developed, to 5 mm. long; dichasial peduncle 

 erect, not differentiated; pedicellar bracts or bracteoles persistent at least until an- 

 thesis • 26. B. cemuum. 



32. Leaf blades with 3 primary veins 36. 



32. Leaf blades with 5 or more primary veins 33. 



33. Oichasia usually paniculate or corymbiform; hypanthium glabrous to moderately short- 

 strigose (calyx lobes glabrqus within). * 35* 



33« Dichasia solitary; hypanthium densely fine-strigose 34. 



34. Leaf blades suborbicular, with 7 primary veins; calyx lobes ovate, slightly imbricate, 

 glabrous within 6. B. rotundif olium. 



34. Leaf blades elliptic to ovate-elliptic, with 5 primary veins; calyx lobes narrowly ob- 

 long, usually sparsely strigulose on apical % to % within 2. B. campanulare. 



