174 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
A general synopsis of the Central American species has been pre- 
pared for future publication, but descriptions of all new species will 
be published in the present series, together with other observations 
which may prove useful to the next monographer of Inga and its 
close ally, Pithecolobium. 
SYSTEMATIC TREATMENT. 
Section 1. LEPTINGA. 
NEW SPECIES. 
Inga mapiriensis Pittier, sp. nov. 
A small tree 8 to 4 meters high; branchlets slender, glabrous. 
Leaves entirely glabrous; petioles marginate or subalate, 0.7 to 1.3 em. long; 
stipules subulate, glabrous, about 4 mm, long, early deciduous; leaflets 1-jugate, 
subsessile, coriaceous; glands very small, globose, pertuse ; leaflet blades oblong- 
lanceolate to lanceolate, long-attenuate at the base, long-acuminate at the apex, 
the costa prominent above, the lower face delicately reticulate, the costa 
hardly prominent, the whole leaflet 7 to 14.5 em. long, 2 to 4.5 em. broad. 
Inflorescences glabrous, rather few- (about 10 to 20-) flowered, single in the 
axils of the leaves or subpaniculate on defoliate axillary branchlets; peduncles 
0.8 to 14 em. long; bractlets minute, subulate, caducous; pedicels glabrous, 
4 to 6 (5) mm. long; calyx tubular, 2.5 to 3 (2.7)? mm. long; corolla tubular, 
broadening toward the apex, 7 to 8 (7.6) mm. long, the lobes 1 to 2 mm. long, 
reflexed, minutely glandular-pubescent at the tips; staminal tube slightly ex- 
ceeding the corolla. 
Legume not known. 
Type in the Herbarium of the New York Botanical Garden, collected at 
San Carlos, near Mapiri, Bolivia, at an altitude of 750 meters, flowers, August, 
1907, by Otto Buchtien (no. 1768). 
Also collected between Guanai and Tipuani, Bolivia, April-June, 1892, Bang 
1421. 
Closely related to Inga heterophylla and I. panurensis, the specimens cited 
having been identified with the former. But in that species the flowers, espe- 
cially the calyces, are much smaller, the leaves, also less developed, are often 
2-jugate, and the glands are very distinctly stipitate; in the latter species 
the flowers are also smaller, the rachis of the leaves much broader, and the 
glands very large and cuplike or subpeltate. In all the specimens of J. mapi- 
riensis examined the umbels are comparatively few-flowered, and the leaves 
narrow, while in both I. heterophylla and I. panurensis the flowers are con- 
stantly very numerous and the leaflets rather broad. 
Inga maxoniana Pittier, sp. nov. PLATE 81, 
A tree 10 to 15 meters high; branchlets subangulate, more or less ferru- 
ginous-tomentose. 
Leaves petiolate; rachis dark brown tomentose, about 5 em. long, the petiolar 
part 2 to 3 cm. long, obscurely flattened or sulcate above, the part between 
the leaflets narrowly canaliculate; glands very small and subsessile or obso- 
lete; leaflets 2 or rarely 3-jugate, petiolulate; petiolules more or less pubescent, 
"In this and parallel cases the numbers in the text are the extremes, and that 
in parentheses the average of 10 measurements. 
