REVISION OF MACROL OBIUM 



333 



The collection from Colombia, Lehmann 1129, must certainly be assigned here 

 but it exhibits sufficient differences that it may well represent a new subspecific 

 taxon within this species. Unfortunately, it is only in bud and is not adequate for 

 critical study. It differs from the rest of the material cited in having a glabrous 

 ovary and the sepals are sparsely puberulous on the inner surfaces. 



This northernmost representative of the genus finds its nearest relative in 

 western Peru in M. iscbnocalyx, from which it differs in a number of respects: (1) 

 it has shorter pedicels, bracteoles, and hypanthium; (2) its sepals are smaller and 

 are glabrous or at most ciliolate minutely at the apex; (3) the ovary is glabrous 

 on the lateral surfaces and the petal is sessile and smaller. 



45. Macrolobium floridum Karsten, Fl. Columb. 1: 151. 1861. Figure 12. 



Large tree with glabrous branchlets and leaves, the petioles 4-6 mm. long. 

 Leaflets 25-30 cm. long, 8-11 cm. wide, sessile, oblanceolate-elliptic, the base 

 inequilateral, the lower side rotund-subcordate, the upper acute, the apex bluntly 

 acute; costa salient, the primary veins prominulous above, prominently salient be- 

 neath, the venules prominulous. Inflorescence about 5-15 cm. long, peduncle 3.5 

 mm. long, the axis minutely puberulous; bracts 2-3 mm. long and wide, oval, acute, 

 glabrous within, puberulous externally. Hypanthium 9-12 mm. long, on a stipe 2 

 mm. long. Sepals 10-13 mm. long, 3-7 mm. wide, elliptic-oblong, obtuse apically, 

 glabrous within, puberulous externally. Petal blade 27-35 mm. long, 15-18 mm. 

 wide, elliptic-oblong, the claw about 3 mm. long, pilosulose basally on the costa. 

 Filaments 40-45 mm. long, glabrous, the anthers 5 mm. long, 2 mm. wide. Stigma 

 subcapitate. Style about 35 mm. long, short-pilosulose. Ovary about 3 mm. long, 

 1 mm. wide, oblong, short-pilosulose marginally, laterally puberulous, 5-ovulate; 

 free portion of the gynophore about 2 mm. long, pilosulose. Fruit unknown. 



Type Collection: Karsten s.rc., "Cordillera littoraii Venezuelae prope Puerto 

 Cabello in silva humida, umbrosa montis, 'Cumbre chiquita' appelati, altitudihe 

 200 metr.," Aragua, Venezuela (HOLOTYPE presumably at Leningrad, isotype W). 



As far as may be judged, this species is most closely related to M. arcberi of 

 western Colombia. M. floridum is set apart from its nearest relative by its acute 

 leaflets, longer inflorescences, shorter sepals, and pubescent hypanthium. 



46. Macrolobium obtusum Pittier, Bol. Soc. Venez. Ci. Nat. 7: 142. 1941. Figure 12. 

 Tree to 12 m. tall, the branchlets and leaves glabrous. Petioles 3-5 mm. long. 



Leaflets 17-30 cm. long, 7-16 cm. wide, sessile, equilateral, broadly elliptic- 

 oval or oblanceolate, the base inequilateral, acute on the upper side, broadly 

 rounded-obtuse on the lower side, the apex broadly rounded-obtuse; costa plane 

 to subsali^nt on the upper surface, salient beneath, the venules prominulous to 

 obscure above, prominulous to prominent beneath. Inflorescences 3.5*9.5 cm. long, 

 terminal on the old branchlets or lateral on old wood, the axis very minutely pu- 

 berulous; bracts 1-1.5 mm. long and wide, triangular, caducous, or persistent, 

 glabrous within, sparsely and minutely puberulous externally, sometimes minutely 

 ciliolate; pedicels 1.5-4 mm. long, very minutely puberulous; bracteoles 8-11 mm. 

 long, 4-6 mm. wide, oval or elliptic-obovate, the apex rotund, glabrous within, 

 sparsely and very minutely puberulous externally. Hypanthium 6.5-9.5 mm. long, 

 on a stipe 1-1.5 mm. long, both minutely puberulous. Sepals 10-13 mm. long, 2.5"" 

 7 mm. wide, oblong or oblong-oval, obtuse, sometimes apiculate, carnose-coria- 

 ceous, ciliolate, glabrous within, very minutely puberulous outside. Petal blade 

 20 mm. long, 6 mm. wide, narrowly elliptic, the claw 3 mm. long, glabrous exter- 

 nally, villose within on the costa. Filaments 35 mm. long, sparsely villosulose 

 toward the bare, the anthers 6.5 mm. long, 3.5 mm. wide. Stigma slightly swollen. 

 Style 22.5-23 mm. long, puberulous basally. Ovary 2-3 mm. long, 1.5 mm. wide, 



