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



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lous on the costa above; costa salient, plane or slightly impressed on the upper 

 surface, salient beneath, the venules obscure on the upper, surface, prominulous 

 beneath. Inflorescence 4-9 cm. long, the axis minutely puberulous, the peduncle 

 1.5-9 mm. long; bracts 1-1.5 mm. long, 1-1.5 mm. wide, triangular, glabrous 

 within, glabrous or pilosulose externally; pedicels 4-7 mm. long, minutely puberu- 

 lous or glabrous; bracteoles 5.5-8 mm. long, 3-3.5 mm. wide, elliptic, pilosulose 

 within, minutely puberulous or glabrous outside. Hypanthium 1.5-2 mm. long, glab- 

 rous, subsessile. Sepals five, 2.5-3.5 mm. long, 1-1.5 mm. wide, the adaxial pair 

 nearly completely united, triangular-lanceolate, acute, the other sepals oblong- 

 lanceolate, lanceolate or elliptic, bluntly acute to acuminate, ciliolate apicaily. 

 Petal blade 3-4 mm. long, 4-5 mm. wide, more or less transversely oval, the claw 

 2.5-6 mm. long, auriculate, ciliolate basally, glabrous externally, villosulose within. 

 Filaments 11-21 mm. long, villosulose basally or glabrous. Stigma simple or capitel- 

 late. Style 8.5-10.5 mm. long, glabrous. Ovary 2-2.5 mm. long, 1 mm. wide, ob- 

 long or linear, glabrous, 2-4-ovulate; gynophore 1.5*3.5 mm. long, puberulous or 

 glabrous, inserted at the top of the adaxial hypanthial wall. Fruit 5.5-10 cm. long, 

 2.5-3 cm. wide, oblong-oblanceolate, glabrous, the carpophores 8-14 mm. long, 

 glabrous. Seed 1-3 per fruit, about 1.5 cm. in diameter, suborbicuiar, the testa 

 membranous, reddish-brown, smooth. 



Key to the Varieties of Macrolobium montanum 



1. Small shrub with glabrous branchlets; leaflets oval to suborbicuiar, leaf rachis 8-18 

 mm. long; bracteoles 6-6.5 mm. long, minutely puberulous on outer surface; filaments 

 villosulose basally. Lower Amazon River region 18a. var. montanum. 



1. Tree 10-12 m. tall, young branchlets minutely puberulous, glabrescent; leaflets oblong, 

 oblong-obovate, or obovate; leaf rachis (15-)25— 32 mm. long; bracteoles 8 mm. long, 

 glabrous on outer surface; filaments glabrous. Potaro River region of British Guiana. 

 18b. var. potaroanum. 



18a. Macrolobium montanum var. montanum. Figure 7. 



Small shrub 1-1.5 m. tall, the branchlets glabrous. Leaf bj.ad.es with the leaf- 

 let pairs 7-11 mm. apart, the rachis 8-20 mm. long. Leaflets glabrous, oval to 

 suborbicuiar, the lower side of the base rotund-obtuse. Pedicels minutely puberu- 

 lous; bracteoles 5.5-6.5 mm. long, 3 mm. wide, minutely puberulous on the outer 

 surface. Filaments basally villosulose. Stigma capitellate. Gynophore 1.5-2.5 

 mm. long, puberulous. Fruit 5.5-6.5 cm. long, the carpophores 8-10 mm. long, the 

 seeds one per fruit. 



LECTOTYPE: A. Ducke (H.J.B.R. No.) 16947 (flowering portion), "Serra Pon- 

 tada regione, Jutahy de Almeirim," Para, Brazil, April 1923 (deposited NY, iso- 

 lectotyges IAN, P, RB, U-in part, US-in part). A lectotype designation is obliga- 

 tory here, because the single collection number cited in the original description 

 consisted of two collections, one flowering and the other fruiting. The sheets at 

 U and at US have parts of both collections mounted on the same sheet, hence the 

 unusual manner of citation above. The NY sheet was selected as the lectotype 

 because the label is in Ducke 's hand, it bears only flowering material, and the 

 locality data are exact. The flowering specimen on the US sheet is in even better 

 condition, but it is accompanied by a portion of the fruiting material and the col- 

 lection number on this sheet involves a transposition of the numerals. The RB 

 material is of the flowering .collection but its condition is inferior to either the 

 NY or US sheets. 



Additional Specimens: BRAZIL: Serra Pontada region, inter Almeirim et Prainha,. Para, 

 Sept. 1923, Ducke (H.J.B.R. No.) 16947- A (fruiting portion) (F-frag., U-in part, US-in part). 

 This collection is being cited as an "A'^number to distinguish between the two collec- 

 tions which were assigned the same number. 



