1953] 



REVISION OF MACROLOBIUM 



281 



6. Macrolobium longipedicellatum Ducke, Arch. Inst. Biol. Veg. Rio de Janeiro 



2: 40. 1935. Figure 3. 



Tree, the branchlets pilosulose. Petioles 3-4 mm. long, canaliculate, sparsely 

 pilosulose. Leaf blades elliptic or lanceolate, 1 1-15'jugate, the pairs of leaflets 

 4-6 mm. apart; rachis 4.5-7.5 cm. long, the wings ciliate, sparsely puberulous 

 above toward the base, glabrous beneath, the axis pilosulose or glabrous above. 

 Leaflets 5-18 mm. long, 3-6.5 mm. wide, oblong, the base inequilateral, the upper 

 side subcordate, the lower side obtuse, the apex truncate, refuse or emarginate, 

 apiculate, glabrous or subglabrous on the upper surface, pilose on the costa be- 

 neath, the costa impressed above, salient beneath, the venules obscure. Inflor- 

 escences 3.5-6 cm. long, the axis glabrous, the peduncles 1.5-3 mm. long; bracts 

 8 mm. long, 2.5 mm. wide, persistent almost to anthesis, lanceolate, acuminate, 

 ciliolate apically but otherwise glabrous; pedicels 6-7 mm. long, glabrous; brac- 

 teoles 8.5 mm. long, 4.5 mm. wide, glabrous, broadly elliptic. Hypanthium about 

 2 mm. long, glabrous. Sepals five, the adaxial pair partly united, 5-5.5 mm. long, 

 2-2.5 mm. wide, oblong or oblong-elliptic, apically ciliolate. Petal blade 6 mm. 

 long, 5 mm. wide, suborbicular, the claw 6 mm. long, strongly alate, pilosulose 

 and ciliolate externally at the base of the claw, villosulose within on the claw 

 and into the throat of the blade. Filaments 23 mm. long, villosulose in the lower 

 part. Stigma capitellate. Style at least 21 mm. long, glabrous. Ovary 2.5 mm. long, 

 1 mm. wide, linear-oblong, glabrous or with very few hairs on the abaxial suture 

 near the base, 3-ovulate, the gynophore 4.5 mm. long, villosulose, inserted at mar- 

 gin of the hypanthium. Fruit unknown. 



Type Collection: A. Ducke (H.J.B.R. No.) 24067, "Sao Paulo de Olivenca, 

 Rio Solimoes," Brazil, Feb. 1932 (HOLOTYPE RB, isotypes F-frag., NY, P, U, 

 US). Known only from the type collection. 



The close relationship of this species with M. huberianum, particularly var. 

 huberianum, is obvious. M. longipedicellatum differs from its closest ally in hav- 

 ing caducous stipules, elliptic or lanceolate leaf blades, differently shaped leaf- 

 let apices and very much larger bracts. 



7. Macrolobium longeracemosum Amshoff, Bull. Torrey Club 75: 389. 1948. Fig- 



ure 3. 



Tree to 8 m. tall, 1.5 dm. diameter, the branchlets pilosulose and puberulous. 

 Petioles 3-6 mm. long, sulcate or canaliculate, short-pilosulose. Leaf blades ob- 

 long, 12-19-jugate, the pairs of leaflets 4-8 mm. apart; rachis 5-12 cm. long, more 

 or less pilosulose. Leaflets 8-30 mm. long, 3-7 mm. wide, oblong, the base in- 

 equilateral, obtuse, the apex rotund, retuse to emarginate; upper surface darkly 

 lustrous and glabrous except uncinate-puberulous basally on the costa, beneath 

 strongly glaucous, sparingly pilose basally on the costa, especially on the apical- 

 lateral surface; costa distinctly salient, the venules subprominulous above, ob- 

 scure beneath. Inflorescences 3-12 cm. long, the axis pilosulose, the peduncle 

 2-4 mm. long; pedicels 1.5-3 mm. long, lanulose-puberulous; bracteoles 5.5 mm. 

 long, 4 mm. wide, obovate, lanulose-puberulous externally, glabrous within. Hy- 

 panthium 2 mm. long on a stipe about 0.5 mm. long, sparsely pilosulose. Sepals 

 five, the adaxial pair partly united, 3-4 mm. long, 1-1.5 mm. wide, ciliolate api- 

 cally. Petal blade 4 mm. long, 4.5 mm. wide, obovate, glabrous, the claw 5.5 mm. 

 long, strongly auriculate, puberulous sparingly on the auricles. Filaments about 

 18 mm. long, glabrous. Stigma capitellate. Style about 20 mm. long, sparsely pi- 

 losulose basally. Ovary 3 mm. long, 1.5 mm. wide, oblong or oblong-ob lanceolate, 

 marginally pilosulose, the lateral surfaces glabrous, 2-ovulate, the gynophore 2.5 

 mm. long, sparsely pilosulose. Fruit (immature) 11 cm. long, 3 cm. wide, oblong 



