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



i 



Vernacular Names: Venezuela: "arepillo", "arepito"; Brazil: "arapari", 

 "arapary-rana", "paricazeiro"; Surinam: "aratapari" (Kar.). 



16b. Macrolobium multijugum var. sinuatum Cowan, var. nov. Figure 6. 



Petiolus 2-3.5 cm. longus, canaliculatus, glaber. Foliorum lamina 5-6-jugata, 

 paribus 1.5-2.5 cm. separatis; rachibus 7-8 cm. longis, glabris. Foliola 4.5-8.5 

 cm. longa, 1-2.5 cm. lata, anguste oblonga, margine sinuato, ad basim inaequalia 

 sed ambobus lateribus acutis, ad apicem obtusa, apiculata, glabra. Inflorescentiae 

 5-9 cm. longae,axe glabro, pedunculo 1-3 cm. longo; pedicellis 2-4.5 mm. longis, 

 glabris; bracteolo 7 mm. longo, 4 mm. lato, ovato-lanceolato, glabro. Sepala 3*4 

 mm. longa, 0.5-1.5 mm. lata, lanceolata, glabra. Filamenta 15 mm. longa. Stigma 

 paulo incrassatum. Ovarium 2-2.5 mm. longum, 1.5-2 mm. latum, ovale vel ovatum, 

 glabrum. Fructus ignotus. 



Type Collection: R, Spruce 2440, "prope Panure ad Rio Uaupes," Brazil, Oct. 

 -Jan. 1852-53 (HOLOTYPE GH, isotypes BM, G, K, NY, P, W). 



On one of the isotypes at Kew, Spruce notes, M the lvs being rendered 



narrower & their margins wavy by the puncture of insects in the bud." However, I 

 have failed to find any suggestion of damage to any part of the specimens ex- 

 amined and I believe that these differences are natural, not due to insect injury 

 as Spruce supposed. 



This species is so variable in most of its characters that it is very difficult to 

 enumerate a number of characters which will infallibly separate it from other re- 

 lated species. However, the punctation of the lower leaflet surface and the elon- 

 gate peduncles of this species are characteristics which reliably distinguish it. 



Macrolobium multijugum is rather closely related to M. molle and to M. dis- 

 color. It may be separated from the first of these by its glabrous or nearly glabrous 

 leaflets and glabrous or minutely puberulous inflorescence axis. From M. discolor 

 it is distinct by its glandular punctations on the lower leaflet surfaces, its elon- 

 gate peduncles, and its very different fruit shape. 



The two varieties involved differ only by the shape and margin of their leaf- 

 lets. Whereas the margins of the broadly oblong to oblong-obovate leaflets of the 

 typical variety are entire, the margins of the narrowly oblong ones of the other 

 variety are distinctly sinuate. 



17. Macrolobium microcalyx Ducke, Bull. Mus. Hist. Nat. Paris II. 4: 729. 1932. 

 Figure 7. 



Shrub of 2 m. to tree 10 m. tall, the branchlets microscopically puberulous or 

 occasionally glabrous. Petioles 2-6 mm. long, glabrous or puberulous on the up- 

 per surface, canaliculate. Leaf blades 3-5-jugate, the pairs 8-25 mm. apart; rachis 

 3-9 cm.* long, glabrous or the axis minutely uncinate-puberulous on the upper sur- 

 face. Leaflets 15-45 mm. long, 7-25 mm. wide, oval to oblong to oblong-obovate, 

 the base inequilateral, the upper side cordate, the lower side acute to subobtuse, 

 the apex rotund, retuse to emarginate, sometimes apiculate; upper surfaces mi- 

 nutely uncinate- or arcuate-puberulous on the costa, glabrous beneath; costa sali- 

 ent above, plane to subsalient beneath, the venules prominulous. Inflorescence 2- 

 9 cm. long, the axis minutely puberulous, the peduncle 2-6 mm. long; bracts 1.5-2 

 mm. long, 1-1.5 mm. wide, caducous, triangular to triangular-ovate, acute, cilio- 

 late, glabrous within, very minutely puberulous externally or rarely glabrous out- 

 side; pedicels 1-3.5 mm. long, very minutely puberulous; bracteoles 4.5-7 mm. 

 long, 2-3 mm. wide, oblong to oblong-oval to oblong-obovate, villosulose within, 

 appressed-puberulous externally. Hypanthium 1-1.5 mm. long, sparsely puberulous, 

 sessile. Sepals five, free, the adaxial ones 0.5-1.5 mm. long, 0.5-1 mm. wide, tri- 

 angular, acute to acuminate, glabrous, the other sepals 1.5*3 mm. long, 1-1.5 mm. 



