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



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4. Ovary glabrous on all surfaces 5. 



4. Ovary sparsely to defisely pubescent on margins or on all surfaces 7. 



5. Peduncle ( 10— ) 1 5— 2 5(— 5 5) mm. long; leaflets strongly punctate on lower surface 



16. M. multijugum. 



5. Peduncle 1.5-9 mm. long; leaflets epunctate 6. 



6. Leaves 5-7-jugate; bracteoles glabrous; filaments 2 5-3 5 mm. long, strongly villose. . . 

 19. M. urupaense. 



6. Leaves 2-3-) u g ate > bracteoles pubescent on one or both surfaces; filaments 10-20 mm. 

 long, villosulose basally or glabrous 18. M. montanum. 



7. Ovary villose on all surfaces; sepals free, strongly dimorphic, the adaxial pair smaller 

 and of a different shape from the others 17. M. microcalyx. 



7. Ovary more or less pubescent on the margins only; sepals variable, sometimes dimor- 

 phic, free or united 8. 



8. Leaflets distinctly punctate on lower surface 9. 



8. Leaflets epunctate 11. 



9. Leaflets oblong to oblong-obovate; peduncles 9-55 mm. long; fruit 3-7.5 cm. long, 3-5 

 cm. wide 10. 



9. Leaflets lanceolate; peduncles 2-3 mm. long; fruit 12.5-15.5 cm. long, 7.5-9 cm. wide. 



14. M. jenmanii. 



10. Leaflets velvety-puberulous on the upper surface, pilose beneath; inflorescence pi- 

 losulose 13. Af. molle. 



10. Leaflets glabrous or more often puberulous in a small area at base of costa; inflores- 

 cence glabrous or minutely puberulous 16. M. multijugum. 



11. Leaflets oval to elliptic, in two pairs, concolorous; inflorescence axis glabrous; stip- 

 ules persistent 20. M. guianense. 



11. Leaflets oblong, oblong-oval or oblong-obovate, in 3-7 pairs, lower surfaces strongly 

 glaucous 15. M. discolor. 



12. Leaves (4-)6-10-jugate 13. 



12. Leaves 10-42-jugate 18. 



13. Peduncle 10-55 mm. long 14. 



13. Peduncle 1-6 mm. long 15. 



14. Leaflets velvety-puberulous on the upper surface, .pilose beneath, entire, involute nar- 

 rowly; inflorescence pilosulose 13. Af. molle. 



14. Leaflets glabrous or with few minute hairs beneath at base of costa, entire or sinuate, 

 plane; inflorescence glabrous or minutely puberulous 16. M. multijugum 



15. Ovary glabrous; bracteoles glabrous or with a few apical hairs externally 16. 



15. Ovary pubescent throughout or only marginally; bracteoles pubescent on both surfaces 

 or only on outer surface 17. 



16. Leaves 5-7-jugate, leaflets about twice as long as wide; filaments villose for half or 

 more of their length, 25-35 mm. long 19. Af. urupaense. 



16. Leaves 10-14-jugate, the leaflets about three times as long as wide; filaments gla- 

 brous, about 15 mm. long 12. Af. furcatum. 



17. Inflorescence terminal; gynophore inserted at or near apex of dorsal wall of hypan- 

 thium; leaves never over 7-jugate, strongly glaucous beneath 15. Af. discolor. 



17. Inflorescences axillary; gynophore inserted at base of hypanthium; leaves 10-16-ju- 

 gate, not strongly glaucous beneath 11. Af. flexuosum. 



18. Leaves 10-30-jugate (to 40-jugate in Af. gracile var. confertum but this with densely 

 pilosulose ovary marginally, much smaller bracts than in following species), leaflets 

 ptane or only very slightly convex; hypanthium cupular 19. 



18. Leaves 35— 45-jugate, each leaflet strongly convex; hypanthium short-cylindric 



1. Af. taxifolium. 



19. Stipules persistent or caducous; pedicels averaging about 6 mm. long (4-8 mm.); brac- 

 teoles glabrous 20. 



19. Stipules caducous; pedicels shorter; bracteoles pubescent on both surfaces or only on 

 outer surface (sparingly pubescent apically in Af. furcatum) 21. 



20. Stipules caducous; leaves elliptic or lanceolate, the leaflets truncate at apex, retuse 

 to emarginate; bracts 8 mm. long, 2.5 mm. wide 6. Af. longi-pedicellatum. 



20. Stipules persistent; leaves oblong to lance-oblong, the leaflets rotund apically, entire 

 or subentire; bracts 3.5-5.5 ram. long, 1-1.5 mm. wide .• . 5. Af. huberianum. 



21. Bracteoles glabrous on inner surface, usually pubescent on outer surface; filaments 

 glabrous; fruit about one and a half times as long as wide (three to four times in M. 

 longeracemosum) 22. 



21. Bracteoles pubescent on both surfaces (in Af. venulosum only on inner surface near 

 apex), pubescence on the two surfaces usually of different types; filaments villosulose 



