MULFOKD KXPLOIIATIOK OF THE AMAZON VALLEY 



251 



linlf way. Ovary 5 nun. long-, ahout twice as thick as the style, 

 w hich eciuahs the stamens, siimously curved at the end. Stigma 

 very small. 



Espia, 3,500 feet, 0. E. White, July 25, 1921 {no. 607). 

 "Small tree on river bank. Flowers white." Species near /. 

 chrysotriclia Pittier. 



Inga trigyna 



(EuiNGA.) Densely short-tomentose throughout, with the 

 exception of the upper leaf-surface. Branchlets stout, lightly 

 costate, ferruginous. Stipules not seen. Leaves (only the 

 upper seen) sessile, the stout racliis 2.5 dm. long. Leaflets four 

 pairs, or three pairs by the suppression of those at the sessile 

 base, the lower successively smaller, all sessile, the uppermost 

 2.5 dm. long, 12 cul broad, oval, varying to slightly broader above 

 or below the middle, with rounded base and slightly produced 

 obtusish summit, thin in consideration of their size, the upper 

 surface nearly glabrous and somewhat shining, pilose on and 

 near the midrib, the principal veins narrowly impressed, softly 

 ferruginous-tomentose beneath, with all the venation sharply 

 prominent. Secondaries about 20 on a side, with very short in- 

 tei'mediates, widely spreading and uioderately falcate, strongly 

 loojjed together close to the thinly revolute margin, strongly con- 

 nected by crooked tertiaries, the venation strongly anastomos- 

 ing. Glands circular, very small, nearly concealed in the tomen- 

 tum. Wings of the rachis complete, rhomboidally obovate, ob- 

 tuse at both ends, the upper successively longer, the uppermost 

 9X6 cm. Panicle (but one seen) terminal, small, stoutly pe- 

 duncled, the flowers crowded, closel}^ sessile. Calyx-tube nar- 

 rowly infundibular, nearly 2 cm. long, about 5 mm. broad, usually 

 slightly contracted at the mouth, al)out twenty-nerved, the teeth 

 subulate, nerved, attenuate, the longest more than 1 cm. long. 

 Corolla densely white-sericeous, the tube narrowly infundibular, 

 longer than the calyx, the lobes 4 or 5 mm. long, ovate, obtuse. 

 Stamen-tube nearly 1 cm. longer than the corolla, the free por- 

 tion of the stamens about 2 cm. long. Pistils three, the ovary 

 very slender, 3 mm. long, the styles unequal, the longest nearly 

 equalling the stamens. Fruit not seen. 



Rurrenabaque, 1,000 feet, E. H. Rushy, October 8, 1921 (no. 

 833). 



"A tree in the edge of the forest, with white flowers." 



