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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 4 



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Type Collection: R. Spruce 2771, "In sylvis 'Caatingas' . . . fluv. Uaupes," 

 Brazil, Nov. 1852 (HOLOTYPE K, isotypes F, G, GH, NY, P, W). 



Additional Specimens: Rio Negro, Vila Icana, April 1947, Pires 450 (IAN). 



The relationships of this species are not particularly well defined but it is 

 perhaps more nearly related to M. amplexans than to any other species. It may be 

 distinguished by its minutely puberulous branchlets, ramiflorous inflorescences, 

 and four-parted calyx. 



The prime character utilized in segregating the varieties is the distribution of 

 the pubescence on the ovary. The ovary of varieties pakarimense and rondonianum 

 is puberulous on all surfaces, while that of varieties petiolatum and uaupesense 

 is puberulous only on the margins, and the ovary of the typical variety is com- 

 pletely glabrous. 



34. Macrolo.bium parvifolium (Huber) Cowan, comb. nov. Figure 11. 



Macrolobium suaveolens Spruce ex Benth. rar. parvifolium Huber, Bol. Mus. Goeldi 5: 

 389. 1909. 



Small shrub, the branchlets minutely puberulous. Petioles circa 4 mm. long, 

 canaliculate, glabrous. Leaflets 4-7 cm. long, 1.5-2.5 cm. wide, glabrous, epunc- 

 tate, inequilateral, arcuate, oval-elliptic or lanceolate, the base inequilateral, 

 subobtuse, the lower side rotund, the apex abruptly or evenly acute, the extremity 

 obtuse or acute; costa subsalient, the venules obscure. Inflorescence 4-14 cm. 

 long, the axis minutely puberulous with the basal portion invested by closely im- 

 bricate, persistent, sterile bracts; bracts 2 mm. long, 1-2 mm. wide, ovate, cilio- 

 late, glabrous within, minutely puberulous externally; bracteoles 4.5 mm. long, 

 2.5 mm. wide, oblong, apiculate, glabrous within, minutely puberulous externally. 

 Hypanthium 1 mm. long, glabrous, sessile. Sepals five, free, glabrous, the ad- 

 axial pair 0.5-1 mm. long, 0.5-0.7 mm. wide, triangular, acute, the others 2.5-3 

 mm. long, 1-1.5 mm, wide, lanceolate, acute, or acuminate. Petal blade 4.5 mm. 

 long, 6 mm. wide, transversely oval, the claw 2.5 mm. long, auriculate, pilosulose 

 externally and ciliolate on the auricles, sparsely villosulose within on the claw 

 and up to the center of the blade. Filaments 11.5 mm, long, villose in the basal 

 part. Stigma capitate. Style 12 mm. long, glabrous. Ovary 2 mm. long, 1 mm. wide, 

 oblong, glabrous, 2-ovulate, the gynophore 2 mm. long, glabrous. Fruit unknown. 



Type Collection: A. Ducke 8497, "campos a E. de Faro," Para, Brazil, July 

 1907 (HOLOTYPE presumably at Museo Goeldi, isotypes F-frag., G, US). Material 

 of this genus has not been received for study from the Museo Goeldi. 



Additional Specimens: Faro, Para, Brazil, May 1911, Ducke 11697 (G). 



Macrolobium parvifolium was originally described as a variety of M. suaveo- 

 lens, fo which it is undoubtedly rather closely allied, but there are so many dif- 

 ferences that it deserves specific recognition. The most striking feature of the 

 plant is the densely bracteate base of the inflorescence axis, and it is this char- 

 acteristic which most readily separates it from any part of M. suaveolens, as well 

 as from other species. Its glabrous ovary distinguishes it from all the varieties of 

 M. suaveolens except the typical one. Its leaflet shape and size, glabrous gyno- 

 phore, and shape of the petal blade serve to differentiate it from the latter. 



35. Macrolobium palustre Ducke, Arch. Inst. Biol. Veg. Rio de Janeiro 4: 13. 1938. 



Figure 11. 



Small tree, the branchlets glabrous. Leaves unijugate to bijugate; the petioles 

 13-18 mm. long, canaliculate; rachis 0-22 mm. long, canaliculate, glabrous. Leaf- 

 lets 6.5-9.5 cm. long, 3-4 cm. wide, glabrous, epunctate, slightly arcuate, ellip- 

 tic, the base inequilateral, acute, the apex acute with a rounded-truncate extrem- 



