MULFORD EXPLORATION OF THE AMAZON VALLEY 



271 



acuminate and acute, thick. Petals nearly three times the len^'th 

 of the calyx, ovate, obtuse, the midrib brown, much thickened, 

 and terminatinii,- in a thick brown appendage. Petals bearing a 

 basal scale on their inner face which is two thirds the length of 

 the petal, bifid and somewhat pilose. Stamens 10, slightly un- 

 equal, connate at the base, the filaments slender, pilose, the 

 anthers globoid. Ovary globoid, a little longer than the united 

 portion of the filameiits. Styles 3, filiform, somewhat tapering, 

 longer than the stamens, the stigmas capitate. 



Rurrenabaque, 1,000 feet, H. H. Rushy, October 7, 1921 {no. 

 1564). 



Malpighiaceae 



Mascagnia ixiamensis 



(Specimens Avith young and mature fruit.) Young portions 

 and infiorescence gray-puberulent. Leaves (only the upper seen) 

 opposite, giandless, the stipules not apparent. Petioles 1 to 2 

 cm. long, slender, channeled above, mostly twisted, the blades 3 

 to 4 cm. long, 3 to 5 cm. wide, ovate, with somewhat rounded base 

 and short-acuminate and acute summit, entire, thin, very short- 

 puberulent beneath, obscurely and sparsely so above, the vena- 

 tion lightly conspicuous beneath, the secondaries about 5 on 

 each side, strongly ascending. Panicle terminal, lax, stoutly 

 peduncled, 2.5 dm. long, 4 dm. broad, the branches opposite, di- 

 vergent with very small ovate, concave bracts with contracted 

 base. Calyx 8-glandular, densely gray-tomentose like the young 

 wings, the sepals broadly triangular-ovate, mostly obtuse, little, 

 if any, exceeding the oblong glands. ]\lature fruit subrotund, 

 nearly 2 cm. broad, the wing very thin. IMature wings sparsely 

 pilose, the dorsal only half the "svidth of the lateral, or less, the 

 truncate base, which does not extend below the base of the nutlet, 

 broader than the summit. 



Ixiamas, 800 feet, M. Cardenas, December 19, 1921 (wo. 1999). 



Mascagnia pachyptera 



(Fruiting specimen.) Glabrous, except for the lightly pubes- 

 cent inflorescence. Stems terete, slender, the leaves opposite, 

 mostly giandless, occasionally one or two obscure glands in the 

 edge of the blade near the base, the stipules not apparent. Peti- 

 oles 1 to 2 cm. long, slender, narrowly grooved above, the blades 

 6 to 12 cm. long, 3 to 6 cm. broad, oval or slightly obovate, with 

 obtuse or acute base and abruptly short-pointed and acute sum- 



