1953] 



REVISION OF MACROLOBIUM 



273 



glabrous beneath. Leaflets 2-28 mm. long, 1-8 mm. wide, oblong or linear, the 

 base inequilateral, the upper side obtuse to cordate, the lower side acute or ob- 

 tuse, the apex rotund or rotund-truncate, retuse to emarginate or less frequently 

 entire, minutely mucronate or apiculate; upper surface pilosulose, or puberulous, 

 or pubescent only at the base with the costa pilosulose or puberulous or very 

 rarely completely glabrous, the lower surface glabrous, generally pilose or pilosu- 

 lose, the apical-lateral surface of the costa more densely invested, or more or 

 less pubescent only on the apical one-half of the blade and the costa; costa plane 

 to impressed, or salient on the upper surface, salient beneath, the venules ob- 

 scure. Inflorescences 1-6.5 cm. long, the axis puberulous, the peduncle (when 



Macrolobium gracile 



• var. confertum 



x var. machddoense 

 A vdr. debile 

 ° var. aracile 

 + Macrolobium machaerioides 

 V Macrolobium brevense 



Macrolobium huberianum 

 A var. pubirachis 

 ■ var. nuberianum 



• Macrolobium longipedicellatum 

 T Macrolobium longeracemosum 



FIG. 3. Geographic distribution of several species of Macrolobium. 



present) 1-3 mm. long; bracts 1.5*3 mm. long, 1-2.5 mm. wide, triangular, triangu- 

 lar-lanceolate, triangular-ovate, or oblong-ovate, glabrous within, puberulous ex- 

 ternally; pedicels 1-3 mm. long, puberulous; bracteoles 5-7.5 mm. long, 2-4 mm. 

 wide, oblanceolate, elliptic, lanceolate, or oblong, acute to acuminate, pilosulose 

 or puberulous externally, pilose, pilosulose, or villosulose within, sometimes 

 sparingly so. Hypanthium 1-1.5 mm. long, subsessile, sparingly puberulous, pi- 

 losulose, or infrequently glabrous. Sepals five, free or infrequently the adaxial 

 pair partly united, 1-4.5 mm. long, 0.5-2 mm. wide, the adaxial pair often triangu- 

 lar, the others lanceolate or triangular-lanceolate, acute to acuminate, sparingly 

 to sparsely ciliolate, infrequently glabrous. Petal blade 2.5-7.5 mm. long, 3*8.5 

 mm. wide, commonly transversely oval, sparingly villosulose on one or both sur- 

 faces in the center or only in the throat, the claw 3-6 mm. long, villosulose on 

 both surfaces or only at the base externally, ciliolate. Filaments 13-27.5 mm. 

 long, villosulose in the lower part. Stigma capitellate. Style 16.5-22 mm. long, 

 villosulose or pilose basally. Ovary 1.5-2.5 mm. long, 0.5-1 mm. wide, fusiform 

 or oblong, villose or pilose marginally, the lateral surfaces glabrous, 2-ovulate; 

 gynophore 2-3 mm. long, villose or pilose, inserted in the hypanthium at the base, 



