1953] 



REVISION OF MACROLOBIUM 



327 



of the hairs uncinate, the wings glabrous beneath, the axis glabrous, pilose, or 

 pilosulose beneath. Leaflets 9-72 mm. long, 4-20 mm. wide, oblong to elliptic or 

 lanceolate-oblong, the base inequilateral, the lower side obtuse, the upper acute 

 to obtuse, the apex obtuse, emarginate, often apiculate; upper surface puberulous 

 on the costa, beneath glabrous to pilosulose on the costa and often on the basal 

 part of the blade; costa plane to impressed on the upper surface, salient beneath, 

 the venules obscure to prorainulous. Inflorescences 2.5-9 cm. long, the axis mi- 

 nutely puberulous or glabrous, the peduncles 0-6 mm. long; bracts 2 mm. long, 1 

 mm. wide, lanceolate, glabrous within, puberulous at the base externally; pedi- 

 cels 2.5-6.5 mm. long, glabrous or puberulous; bracteoles 5-9 mm. long, 2.5-4 

 mm. wide, oblanceolate or obovate, glabrous or more or less puberulous exter- 

 nally, glabrous or sparsely appressed-puberulous within. Hypanthium 5-8 mm. 

 long, glabrous to sparingly puberulous, on a stipe 0.5-2.5 mm. long. Sepals 6-11 

 mm. long, 2-6 mm. wide, oblong to elliptic or obovate, glabrous or ciliolate. Petal 

 sessile or subsessile, 15-25 mm. long, 7-13 mm. wide, elliptic, glabrous or bas- 

 ally villose on the outer surface, villose within on the costa in a broad band. 

 Filaments 12-35 mm. long, villose in the basal part, the anthers 2.5-3 mm. long, 

 1.5-2 mm. wide. Stigma capitellate, or capitate. Style 15-27.5 mm. long, pilose or 

 pilosulose basally. Ovary 2.5-3 mm. long, 1.5 mm. wide, oblong, oblong-elliptic 

 or oblong-ob lanceolate, 3"5-ovulate, the margins pilosulose or pilose, the lateral 

 surfaces glabrous, pilosulose, or puberulous; free portion of the gynophore 2.5-4 

 mm. long, pilose or pilosulose. Fruit 10.5-11.5 cm. long, 3.5-4 cm. wide, oblong, 

 the margins pilosulose and the lateral surfaces glabrous, or puberulous on all sur- 

 faces, the carpophores 4-12 mm. long, pilosulose. Seeds 2-2.5 cm. long, 2 cm. 

 wide, obovate to suborbicular. 



Key to the Varieties of Macrolobium colombianum 



1. Ovary and fruit pubescent only on margins 4. 



1. Ovary and fruit pubescent on all surfaces 2. 



2. Leaflets lanceolate-oblong, 12-13 pairs, 12-26 mm. long, 7-10 mm. wide; carpophores 



4- 5 mm. long. Northeastern Venezuela 40a. var. monagasense. 



2. Leaflets oblong, fewer, usually larger; carpophores 9-12 mm. long. Northern Venezuela 



and Colombian Andes 3. 



3. Leaves 7-10-jugate; stipules 15-25 mm. long. Eastern foothills of Colombian Andes. .. 



40b. var. metaense. 



3. Leaves 5-8-jugate; stipules 8.5-15 mm. long. Northern coastal range of Venezuela. ... 



40c. var. ocumarense. 



4. Stipules 25 mm. long, 5 mm. wide, foliaceous, falcate-fusiform; leaves 6-13-jugate, 



petioles 2-6 mm. long; inflorescence 3.5-5 cm. long, axis puberulous, pedicels 3-3.5 



mm. long, puberulous 40d. var. bicuspidum. 



4. Stipules 5 mm. long, 1.5 mm. wide, nonfoliaceous, subulate-lanceolate; leaves 5-6- 

 jugate, petioles 10-15 mm. long; inflorescence 7-9 cm. long, axis glabrous, pedicels 



5- 6.5 mm. long, glabrous 40e. var. colombianum. 



40a. Macrolobium colombianum var. monagasense Cowan, var. nov. Figure 12. 



Arbor, ramulis pilosulis. Folia oblonga, 12-13-jugata, paribus 6-8 mm. sepa- 

 ratis. Petiolus 5-8 mm. longus, puberulus, sulcatus; rachis 5.5-7 cm. longa, su- 

 pra uncinato-puberula, infra pilosula. Foliola 12-26 mm. longa, 7-10 mm. lata, 

 lanceolato-oblonga, pari inferiore ovali, in costa supra puberula, infra basim ver- 

 sus pilosula. Flores non vidi. Fructus oblongus, ubique puberulus, carpophoro 4- 

 5 mm. longo, pilosulo et puberulo, semina circa 2 cm. diametro, suborbicuiaria. 



Type Collection: /. Steyermark 61841, "forested southwest-facing slopes of 

 Cerro Negro, above La Sabana de las Piedras, northwest of Caripe, alt. 1500 met- 

 ers," State of Monagas, Venezuela, April 1945 (HOLOTYPE F, isotype VEN). 

 Known only by the type collection. 



