MULFOED EXPLORATION OF THE AMAZON VALLEY 



253 



piiberuleiit on the upper surface, thin and lightly prominent on 

 the pubescent lower surface, with the venation loosely anasto- 

 mosino-, the secondaries about 8 to 12 on a side, falcate and ob- 

 scurely connecting- near the margin. Umbels 1 to 3, short- 

 pedunculate or sessile, subspheric, the flowers rather loosely 

 radiating-, the pedicels filiform, sharply angled, about 6 mm. long. 

 Calyx-tube about 1.5 or 2 mm. long, narrowly campanulate, the 

 upper portion somewhat contracted, the limb 5-toothed, about 

 half the length of the tube, the linear-subulate teeth Avith in- 

 curved sunmiits. Corolla-tube narrowdy infundibular, about 4 

 mm. long, the limb about half as long-, the lobes ovate, erect. 

 Stamen-tube altout as long as the corolla-tube, very narrowly in- 

 fundibular. Free portion of tlie filaments as long as, or exceed- 

 ing the rest of the flower and shorter than the styles, the anthers 

 and stigma very small. Fruit not seen. 



Spreading- over river-banks, on the River Ibon, Beni, 400 feet, 

 0. E. White, February 18, 1922 {no. 2393). "A low tree, 30 to 

 40 feet high." Species near 7. myriantha. 



Pithecolobium angustifolium (Rushy) 



P. sophorocarpum (I) angustifolium Rusby, Mem. Torrey Club 



6 : 28. 1896 



This plant, originally collected by Miguel Bang, near Guanai, 

 in 1892, has been again collected {no. 1752), at San Buena Ven- 

 tura, 1,000 feet, November 22, 1921, by M. Cardenas, who reports 

 it as "a large tree, with red fruits." The latter specimens agree 

 in every respect with those of Mr. Bang, showing that the differ- 

 ences between it and P. sophorocarpum Benth. are constant over 

 a wide region. I can no longer doubt its specific distinctiveness. 

 The legmne consists of about 10 or 12 joints, which are com- 

 pletely separated by short constricted portions. The joints are 

 verrucose, especially before maturing, and all parts of the fruit 

 are ferruginous-tomentellate. 



Pithecolobium dependens 



(Section Caulanthes.) Glabrous, the branchlets slender. 

 Leaves 1- jugate, the pinnae 2- jugate, but one of the lower pairs 

 wanting, the petiolules and petioles 1 to 1.5 cm. long, slender, 

 like the rachis, which is about 3 or 4 cm. long, lightly 2-grooved 



