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



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lower side rotund and long-decurrent, the upper side acute, the apex acute to acu- 

 minate, the extremity blunt, entire or emarginate; glabrous, or the base very mi- 

 nutely puberulous on both surfaces or only on the upper surface, often conspicu- 

 ously punctate beneath; costa somewhat salient on both sides, the venules promi- 

 nent, or only prominulous beneath. Inflorescences 4-7.5 cm. long, the axis glab- 

 rous or very minutely puberulous, the peduncles 3*11 mm. long; bracts 1.5-2 mm. 

 long, 1 mm. wide, caducous, triangular, glabrous except for the ciliolate margins; 

 pedicels (l-)2.5-8 mm. long, glabrous or minutely puberulous; bracteoles 3.5-8 mm. 

 long, 2-3.5 mm. wide, often caducous, oblong or oblong-obovate, carnose-coriace- 

 ous, the apex rotund, apiculate or cuspidate, glabrous. Hypanthium 2.5*3.5 mm. 

 long, on a stipe 2-4 mm. long, glabrous. Sepals four, 4-7.5 mm. long, 2-4 mm. 

 wide, oblong, apically rotund, concave, glabrous or somewhat ciliolate. Petal 

 blade 3.5-6 mm. long, 4-4.5 mm. wide, oval to suborbicular, the claw 4-5.5 mm. 

 long, auriculate basally, glabrous externally or pilosulose basally, ciliolate on 

 the base of the claw, villosulose within on the claw and up to the center of the 

 blade on the costa. Filaments 13.5-19.5 mm. long, villose in the lower part. Stigma 

 capitate. Style 10-13 mm. long, glabrous. Ovary 2.5-4 mm. long, 1.5-2 mm. wide, 

 more or less elliptic, the adaxial margin strongly alate, 2-4-ovulate, glabrous, the 

 gynophore 2-2.5 mm. long, glabrous, inserted at the top of the adaxial wall of the 

 hypanthium. Fruit (sub-mature) 6.5-15 cm. long, 4-5 cm. wide, oblong, glabrous, 

 the adaxial margin with prominent thin wings, the carpophores 9-11 mm. long, 

 glabrous. Seeds four per fruit, obovate (immature). 



Type Collection: R. Spruce 2734, "In sylvis humilioribus circa Panure," Bra- 

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



Additional Specimens: BRAZIL: Amazonas: Joao da Lapa, Estacamento, Rio Icana, 

 May 1948, Black 48-2731 (NY, U); Miri, Rio Taruma, Manaos, Jan. 1946, Ducke 187*1 (F, 

 GH, IAN, NY, US); campos a L'est de Faro, Jan. 1916, Ducke (H.A.M.P. No.) 15911 (also 

 cited as H.A.M.P. No. 15976 and H.J.B.R. No. 10910) (G, P, RB, US); Campina da Ponta 

 Negra, Manaos, Oct. 1929, Ducke 23292 and April 1932, Ducke 23292-A (US); Yucahy, 

 above mouth of Rio Curicuriary, upper Rio Negro, Nov. 1929, Ducke 23294 (G, P, U, US); 

 Camanaos, Rio Negro, Sept. 1935, Ducke (H.J.B.R. NoJ 35191 (K).(type collection of Af. 

 punctatum fm. bijugum Ducke); Rio Negro, Padauiry, Sao Pedro, Oct. 1947, Froes 22655 

 and 22664 (IAN); Rio Uaupes, Panure, Nov. 1947, Pires 1091 (IAN); Rio Vaupes between 

 Ipanore and confluence of Rio Negro, Nov. 1947, Schultes & Pires 9120 (US). 



In this section there are only three species with a single pair of leaflets which 

 are petiolulate, the above species, M. canaliculatum, and M. arenarium. The latter 

 species is perhaps the most distinct of the species in the section because of its 

 equilateral, oval or ovate leaflets which are not at all arcuate or falcate. M. punc- 

 tatum most closely approaches M. canaliculatum but it may be distinguished by 

 the usually strong punctation of the leaflets of the former as well as by its nar- 

 rower, more or less erect petal, and smaller bracteoles. M. canaliculatum has the 

 petal strongly recurved and much larger bracteoles. 



There seems to be no justification for maintaining Ducke 's forma bijugum, the 

 sole difference being that some of the leaves have two pairs of leaflets. 



25. Macrolobium unijugum (Poepp. & Endl.) Cowan, comb. nov. Figure 8. 

 Inga unijuga Poepp. & Endl. Nov. Gen. & Sp. Pi. 3*. 79. 1845. 



Tree or shrub 3-23 m. tall, the branchlets very minutely puberulous or glab- 

 rous. Petioles 8-25 mm. long, subsulcate to canaliculate, very minutely puberu- 

 lous or glabrous. Petiolules' to 3 mm. long sometimes present. Leaflets 10.5-30 

 cm. long, 3-10 cm. wide, inequilateral to subequilateral, more or less arcuate, 

 elliptic, the base inequilateral, acute, decurrent, the apex obtusely acute to acu- 

 minate, the extremity rounded-truncate or acute; upper surface minutely puberu- 

 lous on the costa or glabrous, beneath glabrous or minutely puberulous on the 



