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This very poorly known species exhibits characters which ally it with M. mon- 

 tanum and M. microcalyx, the former being much the nearer relative of the two. M. 

 urupaense shares with M. montanum the glabrous ovary character, but they may be 

 differentiated by the larger number of leaflet pairs, g labrous bracteoles, and longer 

 villose filaments of M. urupaense . From M. microcalyx this species may be read- 

 ily recognized by its glabrous ovary and inflorescence. 



20. Macrolobium guianense (Aubl.) Pulle, Enum. Vase. Pi. Surinam 211. 1906. 



Figure 10. 



Outea guianensis Aubl. Pi. Guian. 1: 29. pi* 9. 1775. 



Macrolobium Utea Gmelin, Syst. Nat. ed. 13. 2(1): 93. 1796. 



Macrolobium pinnatum Willd. Sp. Pi. 186. 1797. 



Utea guyannensis (Aubl.) J. St.-Hil. Expos. Fam. 2: 203. 1805. 



Macrolobium Outea Steud. Nona. Bot. 1: 503. 1821. 



Vouapa guyanensis (Aubl.) Taub. Bot. Centralbl. 47: 394. 1891. 



Vuapa guianensis (Aubl.) Kuntze, Rev. Gen. 1: 213. 1891. 



Tall tree, to 5 m. diameter (fide Aublet), the branchlets pilosulose and puberu- 

 lous. Stipules 6-7.5 mm. long, 0.5-1 mm. wide, linear, acuminate, persistent, cil- 

 iolate, glabrous within, pilosulose outside. Petioles 3-6 mm. long, canaliculate, 

 pilosulose. Leaf blades 2-jugate, the pairs of leaflets 13-17 mm. apart; rachis 

 13-17 mm. long, pilosulose on the upper surface, the axis pilosulose beneath. 

 Leaflets 27-56 mm. long, 15-26 mm. wide, oval to elliptic, the base inequilateral, 

 the upper side subcordate to cordate, the lower side acute, the apex obtuse, re- 

 tuse, minutely apiculate; upper surface more or less uncinate-puberulous on the 

 costa, sparsely to sparingly pilosulose on the basal one-half or less of the costa 

 beneath; costa salient, the venules prominent. Inflorescence 5-7.5 cm. long, the 

 axis except the peduncle glabrous, the peduncle 12-13 mm. long, puberulous; 

 bracts somewhat persistent, 7-7.5 mm. long, 1-1.5 mm. wide, lanceolate to lin- 

 ear, acuminate, ciliolate, otherwise glabrous; pedicels 4.5-8 mm. long, puberu- 

 lous in two lines which coincide with the separation lines of the bracteoles; brac- 

 teoles 7.5-9 mm. long, 3.5 mm. wide, elliptic, apiculate, glabrous. Hypanthium 2 

 mm. long, sessile. Sepals five, the adaxial pair partly united-, 2.5"3»5 mm. long, 

 1-1.5 mm. wide, the other sepals 4.5-6.5 mm. long, 1-2 mm. wide, lanceolate, 

 glabrous, bluntly acute or obtuse. Petal blade about 6 mm. in diameter, orbicular, 

 the claw 4.5 mm. long, weakly villosulose on the claw and up into the throat of 

 the blade within, glabrous externally. Filaments about 20 mm. long, the lower part 

 villosulose. Style glabrous. Ovary 2.5-4.5 mm. long, 1-1.5 mm. wide, oblong, 

 sparsely pilosulose on one or both margins, the lateral surfaces glabrous, 4-ovu- 

 late; gynophore 2.5-4.5 mm. long, pilosulose, inserted in the hypanthiurr near the 

 apex of the adaxial wall. Fruit unknown. 



Type^Collection: F. Aublet s.n. t Guiana (isotype BM). 



Additional Specimens: SURINAM: Hostmann & Kappler 254 (F, K, P, U, US, W). This 

 collection has been variously cited as "Hostmann s.n.," "Hostmann 254," and as it is 

 cited here, but all are undoubtedly parts of the same collection. 



The nearest relative of M, guianense is probably M. montanum or Al. urupaense, 

 but the relationship to either is rather remote. It is easily recognizable from both 

 of its presumed relatives by its oval or elliptic leaflets which are always in two 

 pairs and by its persistent stipules. 



21. Macrolobium campestre Huber, Bol. Mus. Goeldi 5: 389. 1909. Figure 7. 

 Shrub to large tree 35 m. tall, the branchlets and leaves glabrous, very rarely 



the branchlets sparsely puberulous or pilosulose. Petioles 5-30 mm. long, terete 

 or weakly sulcate to subcanaliculate. Leaf blades 2-3"jugate, sometimes one leaf- 

 let of the terminal pair absent and then the leaf pseudo-imparipinnate, the pairs 



J 



