190 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Rachis of the leaves very narrowly winged, densely ferruginous-tomentose, 
4.5 to 9.5 em. long, the petiolar part nude, terete, 1 to 1.7 cm. long, the first 
interfoliar part nude or seminude; stipules lanceolate, acute, sparsely hairy, 
about 5 mm, long, caducous; leaflets 4 or 5-jugate, seldom 38-jugate, oblique, 
very shortly petiolulate, membranous; glands small, sessile, scutellate or cup- 
shaped, often obsolete; leaflet blades elliptic-ovate, obovate, or elliptic-oblong, 
narrow and more or less rounded at the base, acuminate at the apex, glabrous 
and lustrous above, the costa more or less hairy and subprominent and the 
veins impressed, softly ferruginous-tomentose beneath, the costa and veins 
densely hairy and prominent; blades of the basal pair 3.5 to 4.5 cm. long, 1.2 
to 2 cm. broad, those of the terminal pair 8 to 12 em, long, 3.5 to 4 em, broad. 
Inflorescences mostly terminal, the floral spikes single or 2 or 3-clustered in 
the axils of the upper leaves; peduncles densely ferruginous-pubescent, 2.5 to 
4.5 em. long; flower heads ovoid; flowers sessile; bractlets linear-subulate, hairy, 
3 to 4 mm. long, subpersistent; calyx tubular, more or less stipitate, 5 to 6 
(5.4) mm. long, covered with a coarse pubescence, this dense at the base, 
sparser toward the apex, the teeth short and rounded; corolla tubular, slightly 
widening toward the apex, 8.6 to 9.7 (8.9) mm. long, villous, the lobes lanceolate, 
obtuse, about 2 mm. long; staminal tube included, the tube and filaments pink; 
style clavate at the apex, longer than the stamens. 
Legume not known. 
Type in the John Donnell Smith Herbarium, collected at Rodeo de Pacaca, 
near San José, Costa Rica, in woods, flowers, January, 1891, by H. Pittier (Inst. 
Fis. Geogr. Costa Rica, no. 3251). 
Also collected at San Marcos de Dota, in forests, flowers, March, 1893, Tonduz 
(Inst. Fis. Geogr, Costa Rica, no. 7548). 
Identified with Inga densiflora Benth. by Micheli, but differing from that 
Peruvian species in the tomentose indumentum, in the size, shape, and texture 
of the leaflets, and in the arrangement of the inflorescence, as well as in the 
minor details of the flowers. 
Inga monticola Pittier, sp. nov. PLATE 96. 
A widely spreading tree, about 16 meters high (Williams); branchlets 
terete, pubescent, covered with round, whitish lenticels, the younger parts 
ferruginous-pubescent. 
Rachis of the leaves very narrowly winged, ferruginous-pubescent, 5.5 to 
10 cm. long, the petiolar part 0.7 to 1 em. long; stipules unknown; leaflets 
mostly 4-jugate, seldom 3-jugate, oblique, membranous, short-petiolulate 3 
glands large, sessile, subpeltate, orbicular; petiolules ferruginous-pubescent, 
1 mm. long or less; leaflet blades ovate, oblong, or ovate-elliptic, more or less 
rounded at the base, acute or abruptly short-acuminate at the apex, glabrous 
and lustrous above except on the pubescent, prominent costa and veins, gla- 
brous or sparsely hairy and reticulate beneath, the venation here pubescent 
and strongly prominent, the blades of the basal pair 4 to 5 cm. long, 1.5 to 2.5 
cm. broad, those of the terminal pair 8 to 14.5 cm. long, 3 to 5.5 em. broad. 
Floral spikes single in the axils of the upper leaves; peduncles 3 to 4 em. 
long, ferruginous-pubescent; flower heads elongate (2 to 3.5 em. long), depau- 
perate; flowers sessile; bractlets linear or subulate, 1 to 3 mm. long, pubescent, 
subpersistent; calyx tubular, substriate, sparsely puberulent, 4.1 to 4.8 mm. 
long; corolla 7 to 8 mm. long, tubular, the upper half subcampanulate, mi- 
nutely pubescent, the lobes lanceolate, acute, reflexed, about 1.5 mm. long; 
staminal tube included. 
Legume sessile, 8 to 16 cm. long, rounded or subcuneate at the base, acumi- 
nate at the apex, the valves 5 cm. broad, blackish, transversely grooved, at 
