COLLECTED IN SourH AMERICA, 1885-1886 701 
Dioscorea angustifolia sp. nov. 
Sparsely short-pilose: stems stout, terete, purple: petiole 
(but one seen) 1 dm. long, very stout; blade 1.75 dm. long, 3 
dm. broad, strongly cordate, 5-lobed, the sinuses narrow, rounded 
at the termination, extending three fourths of the way to the base, 
the lobes ovate or obovate, terminating in a very short broad 
obtuse point, the middle 5-ribbed, the others 2-ribbed, the ribs 
connected by straightish secondaries: leaf thin, deep-green, the 
venation sharply prominent and pubescent underneath: staminate 
panicle (but one seen) 2 dm. long, loosely much-branched, the 
branches elongated, slender or filiform, loosely flowered: bracts 
deciduous, ovate, attenuate, two thirds as long as the fully-grown 
bud: perigone thickened, divided nearly to the base, sparsely 
pilose without, the segments 3 mm. long, oblong or very little 
broader above the middle, obtuse, the midrib broad and stout, 
almost a keel: stamens two-thirds as long as the perigone seg- 
ments, adnate one sixth of the length of the latter, the filaments 
Stoutish, the anthers .5 mm. long, truncate. 
Species near D. frifida, but that has not the loosely paniculate 
inflorescence of this. 
Mapiri, 5000 ft., May 1886 (no. 534). Dr. Britton says the 
Same as Burchell’s no. 10,031. 
Dioscorea Mandoni sp. nov. 
Calyx-tube pubescent, the rachis slightly so : branchlets angled : 
petioles (but two seen) 6-8 cm. long, gradually dilated downward 
and broadly channelled, ribbed; blades 1.4 dm. long, exclusive 
“of the basal lobes, and of about the same breadth, cordate, the 
basal lobes about 5 cm. long, rounded, nearly meeting, the sinus 
rounded at the petiole insertion, the summit of the leaf abruptly 
contracted into an acumination about a cm. long and broad ; pri- 
_ mary ribs 7, the latter bordering the lobes for a short distance, 
then throwing off one to three branches, yellowish, oe ae 
‘underneath : one pistillate spike seen, 3.5 dm. long, including si 
peduncle which is 1 dm. long, very slender, drooping, very sun 
flowered: bracts about half the length of the ovary, narrowly 
lanceolate and alternate: perianth-tube of the freshly synaitie 
flower 5 mm. long, lance-oblong, grayish-pubescent, the - s 
Nearly 3 mm. long, oblanceolate, acutish : stigmas I mm. long, 
thick, strongly recurved, lobed or cut at the summit. 
Guanai, 2000 ft., May 1886 (no. 533). Jo 
The same as Mandon’s no. 1232, the fruit of which is 2.5-3 
cm. long, half as broad, ellipsoidal, but slightly broader above, 
