1953] 



REVISION OF MACROLOBIUM 



269 



in lower part (glabrous in M. froesii); fruit two and one half to three and one half times 



as long as wide 24. 



22. Peduncles 4-6 mm. long; leaves 1 1-14-jugate, leaflets oval-oblong, the pairs 8-12 mm. 

 apart; plant essentially glabrous 12. M. furcatum. 



22. Peduncles 0-4 mm. long, densely pilosulose, bracts pubescent on outer surface; ovary 

 pilosulose marginally; branchlets densely pilosulose to glabrous; leaves commonly 15- 

 25-jugate, the leaflets oblong, the pairs 4-8 mm. apart, usually pubescent on costa on 

 lower surface but sometimes glabrous 23. 



23. Costa of leaflets distinctly salient on both surfaces, venules prominent on upper sur- 

 face; bracteoles and pedicels lanulose-puberulous; fruit about three to four times as 

 long as wide 7. M. longeracemosum. 



23. Costa impressed on upper surface of leaflets, salient beneath, venules obscure; brac- 

 teoles and pedicels pilosulose; fruit about one and a half times as long as wide 



8. M. acaciaefolium. 



24. Leaves 10-16-jugate, pairs of leaflets 9-20 mm. apart, the leaflets with many closely 

 parallel veins prominent on both sides, the median leaflets of mature leaves about 4 

 cm. long, 1.5 cm. wide 11. M. flexuosum. 



24. Leaves 10-40-jugate, pairs of leaflets 2-10 mm. apart, the leaflets with obscure veins 

 or sometimes prominulous on one or both surfaces but then not closely parallel, median 

 leaflets of mature leaves usually less than 2.5 cm. long, 1 cm. wide 25. 



25. Inflorescences 2-6.5 cm. long 26. 



2 5. Inflorescences usually less than 2 cm. in length 2. M. gracile. 



26. Inflorescence pilosulose, the bracteoles flexuose-pilosulose and pilose on outer sur- 

 face; costa of leaflets strongly salient on upper surface 4. M. brevense. 



26. Inflorescence puberulous, the bracteoles puberulous or short-pilosulose and puberulous 

 on outer surface; costa of leaflets plane or impressed on upper surface (salient in M. 

 gracile variety macbadoense, but this with strongly lanceolate leaves) 27. 



27. Leaflets truncate at apex 30. 



27. Leaflets rotund at apex 28. 



28. Leaflets two to three times as long as wide, not tapering toward the emarginate or re- 

 tuse apex 29. 



28. Leaflets four to six times as long as wide, tapering toward the entire or slightly retuse 

 apex 2. M. gracile. 



29. Upper side of leaflet base strongly angular-auriculate, the apex strongly emarginate; 



sepals 1.5-2.5 mm. long, acute; filaments villosulose; ovary villose marginally 



3. M. machaerioides. 



29. Upper side of leaflet base not auriculate, the apex weakly retuse; sepals 3.5 mm. long, 

 acuminate; filaments glabrous; ovary pilosulose marginally 9- M. froesii. 



30. Large shrub or small tree to 5 m. tall with branchlets, rachis, petioles and carpophores 

 puberulous; leaves oblong, the leaflets in 13-17 pairs, 6-7 mm. apart, the costa plane 

 on upper surface 10. M. venulosum. 



30. Tree 20 m. tall with branchlets, lower surface of rachis, and carpophores pilosulose; 

 leaves strongly lanceolate, the leaflets in 20—24 pairs, 3-5 mm. apart, the costa sali- 

 ent on upper surface 2. M. gracile. 



31. Leaflets with well-developed intramarginal nerves 32. 



31. Leaflets without intramarginal nerves 33. 



32. Leaflets with venules closely parallel and prominulous on both surfaces, the intra- 

 marginal nerve originating from base of costa, the apex strongly emarginate, rotund. . . 

 30. M. retusum. 



32. Leaflets with venules obscure or if prominulous, not closely parallel, the intramarginal 

 nerve formed by anastomosing of primary veins, the apex entire, acute to acuminate. .. 

 2 5. M. unijugum. 



33. Ovary pubescent throughout or only on margins 34. 



33. Ovary glabrous 43. 



34. Ovary pubescent throughout 35. 



34. Ovary pubescent only on margins 41. 



35. Hairs of inflorescence and flower parts preponderantly clavate; bracteoles 6-8.5 mm. 

 long, very thick-coriaceous; hypanthium densely clavate-puberulous. Plants endemic 

 to coastal rain forest of Brazil between Bahia and Ilheos 28. M. latifolium. 



35. Hairs not clavate but terete or ribbon-like; bracteoles smaller and thinner though some- 

 times coriaceous; hypanthium glabrous or with minute hairs sparsely distributed. 

 Mostly northeastern South America 36. 



36. Leaflets epunctate on lower surface; blade of petal orbicular or oval. « 37. 



36. Leaflets punctate beneath; blade of petal oval transversely 40* 



