1953] 



REVISION OF MACROLOBIUM 



305 



petalodia sometimes present. Filaments 20 mm. long, villosulose basally. Stigma 

 capitate. Style 17 mm. long, glabrous. Ovary 3.5-4.5 mm. long, 1.5-2 mm. wide, 

 oblong, glabrous, 3-5-ovulate, the gynophore 2.5 mm. long, glabrous. Fruit (old 

 valves) about 9.5-13 cm. long, 4.5-5 cm. wide, oblong, strongly alate on the ad- 

 axial margin, the carpophore 10 mm. long, glabrous; seeds 3-5 per fruit, oval. 



Type Collection: R. Spruce 2782, "In sylvis humilioribus fl. Uaupes," Ama- 

 zonas, Brazil, Dec. 1852 (HOLOTYPE K, isotypes G, GH, NY, P, W). 



Additional Specimens: BRAZIL: Upper Rio Curicuriary, trib. of Rio Negro, Nov. 1936, 

 Ducke 35190 (RB, US). 



VENEZUELA: Cerro Yavita, Rio Atabapo, Amazonas, Oct. 1950, Maguire 29284 (NY, 

 US). 



There is ample morphologic evidence for assuming a rather close relationship 

 between this species and M. punctatum. They both have a long-stipitate hypan- 

 thium and petiolulate leaflets, and they have a similar aspect. M. canaliculatum 

 may be distinguished from its near relative by its epunctate leaflets, the apices 

 of which are rotund-obtuse. In addition, M. punctatum also has much shorter se- 

 pals, smaller bracteoles, and narrower petal blade, and the petal is usually erect. 



24. Macrolobium punctatum Spruce ex Benth. in Mart. Fl. Bras. 15(2): 219. 1870. 

 Figure 8. 



Vouapa punctata (Spruce ex Benth.) Taub. Bot. Centralbl. 47: 394. 1891. 

 Vuapa punctata (Spruce ex Benth.) Kuntze, Rev. Gen. 1: 213. 1891. 



Macrolobium punctatum Spruce ex Benth. forma bijugum Ducke, Arch. Inst. Biol. Veg. 

 Rio de Janeiro 4: 14. 1938. 



Shrub or small tree to 8 m. tall, the branchlets very minutely puberulous. Peti- 

 oles 9-20 mm. long, sulcate on the upper surface, flattened dorso-ventrally, glab- 

 rous or very minutely puberulous. Petiolules 2-6 mm. long, glabrous < very mi- 

 nutely puberulous. Leaflets (8-)ll(-l6) cm. long, (2.5-)4(-6.5) cm. wide, strongly 

 inequilateral, falcate, elliptic or lanceolate, the base strongly inequilateral, the 



FIG. 8. Geographic distribution of M. canaliculatum, M. punctatum, M. unijugum, and 

 M. klugii. 



