1953] 



REVISION OF MACROLOBIUM 



283 



ram. wide, the uppermost leaflets smallest, oblong, the base inequilateral, the up- 

 per side subobtuse to cordate, the lower side acute to obtuse, the apex rotund, 

 retuse to emarginate, usually minutely apiculate; upper surface usually shiny, 

 glabrous, or puberulous to pilosulose on the costa or sometimes more or less pu- 

 berulous on the blade also, the lower surface glabrous to more or less strongly 

 golden-pilose on the apical-lateral surface of the costa, extremely rarely pilosu- 

 lose on part or all of the blade; costa impressed on the upper surface, salient be- 

 neath, the venules obscure to prominulous. Inflorescences (l-)2(-6) cm. long, 

 densely grayish-pilosulose, infrequently with one basal branchlet, the peduncles 

 (when present) about 4 mm. long; bracts caducous, (1.5-)3-5(-6) mm. long, (1-) 

 2.5(~5) mm. wide, broadly ovate to oval, or oblong, concave, acute to cuspidate- 

 acute, ciliolate, glabrous or rarely minutely strigulose near the base within, 

 densely pilosulose externally; pedicels (1.5-)2.5(-5) mm. long, densely pilosulose; 

 bracteoles (3-5-)5(— 7) mm. long, (1.5-)3(-4) mm. wide, concave, obovate to oval 

 to ovate, glabrous within, densely pilosulose externally. Hypanthium 1-2 mm. 

 long, sessile or with a stipe 0.5 mm. long, glabrous or sparsely pilosulose bas- 

 ally. Sepals five, the adaxial pair partly united, 2.5*6.5 mm. long, 1-3.5 mm. wide, 

 oblong to lanceolate, obtuse, acute, or acuminate, glabrous or rarely ciliolate 

 sparsely at the apex. Petal blade 3~5.5 mm. long, 5-7.5 mm. wide, transversely 

 oval, rarely suborbicular, the claw 3*5.5 mm. long, more or less auriculate, glab- 

 rous externally, villosulose within on the claw and over the center of the blade or 

 the blade totally glabrous, the claw ciliolate in the lower part; 1-4 petalodia often 

 present, to 5 mm. long, linear. Filaments (12-)15(-20) mm. long, glabrous. Stigma 

 capitellate. Style (9-)15(-20) mm. long, basally pilosulose. Ovary 2-3 mm. long, 

 1-1.5 mm. wide, oblong to oval or oblong-obovate, (l-)2(-3)-ovulate, the margins 

 pilosulose, the lateral surfaces glabrous; gynophore 1-2.5 mm. long, pilosulose, 

 the hairs usually directed basally, inserted at the base of the hypanthium or some- 

 times up to midway on its adaxial wall. Fruit indehiscent, 4.5-7 cm. long, 3-5.5 

 cm. wide, oblong to orbicular, flat, the adaxial margin thicker than the abaxial and 

 sulcate, sparsely pilosulose on the margins, the carpophores l-2.5(-6) mm. long, 

 pilosulose. Seeds one per fruit, 3-4.5 cm. long, 2-3.5 cm. wide, flat, oval or ob- 

 long, the testa crustose, tan-brown to black, irregularly salient-venose. 



Type Collection: Robt. Schomburgk 521 , "Rooponoony and Essequibo Rivers," 

 1838 (HOLOTYPE K, isotypes BM, F, G, K, P, US, W). 



Additional Specimens: BRAZIL: Burchell 9141 (GH); Rio de Janeiro, Glaziou 13755 

 (P). Para: Rio Mapua, Canta Galo, municip. de Breves, July 1950, Black, Froes & Ledoux 

 50-9875 (NY); near Rio Jumunda, Sao Jorge, municip. Faro, Nov. 1950, Black & Ledoux 

 50-10700 (IAN); Tapajoz, Boa Vista, July 1932, Capucho 341 (F, IAN); Igarape de Irera, 

 near Santarem, Aug. -Sept. 1938, Dahlgren s.n. (F, US); Boa Vista, Rio Tapajoz, June 1929, 

 Dahlgren & Sella 110 (F, US), 190 (F, NY); Oyapoc, June 1904, Ducke 4775 (G); Lago 

 de Faro, Aug. 1907, Ducke 8398 (G); Rio Tapajoz, first rapids (S. Luiz), Dec. 1915, Ducke 

 15815 (G, US); Rio Oiapoque, Terr. Amapa, Feb. 1950, Froes 25911 (IAN, NY); Maraba, 

 Rio Itacaiuna, June 1949, Froes & Black 24385 (IAN, NY); Rio Purus, June 1903, Goeldi 

 3901 (G, US); Bas Xingu, Dec. 1903, Goeldi 4152 (G); Rio Maraca, July 1896, Guedes 614 

 (G); Marajo, June 1896, Huber 186 (G); Rio Capim, July 1897, Ruber 911 (G, US); Quati- 

 puru, Dec. 1899, Huber 1764 (G); Cassipa in Tapajoz R. region, Sept. 1931, Krukoff 1238 

 (A, F, G, MO, NY, P, U, UC); Monte Alegre, July 1908, Snetblage 9562 (G); Santarem, June 

 1850, Spruce 920 (P); vie. Santarem, June 1850, Spruce s.n. (F-frag., G, GH, NY, P, W). 

 Matto Grosso: Rio Santarem and Barbados, Jan.-Dec. 1928, Riedel 1568 (A, NY); "Matto 

 Grosso et Santarem," Riedel s.n. (A); Rio Guapore, July 1942, Sandeman 2143 (K). Ama- 

 zonas; Tefe,beira do Chi-daruim, Aug. 1947, Black 47-1208 (IAN, U); Rio Janeiro, Manaos, 

 Aug. 1948, Comer 8 (IAN, NY); Sao Paulo de Olivenca, Rio Solimoes, Igarape Jaratuba, 

 June 1940, Ducke 340 (Y); Rio Negro ad flum. Apuahu, July 1941, Ducke 757 (F, IAN, MO, 

 NY, US); Manaos, Igarape Guarita, April 1943, Ducke 1228 (IAN, MO, NY, US); Lago de 

 Teffe, June 1906, Ducke 7369 (G); Rio Jatahy, Riosinho Juruema, June 1945, Froes 21017 

 (IAN, NY); upper Rio Pacu, Terr. Rio Branco, March 1948, Froes 23152 (IAN); Taperinha 



