186 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
the basal pair 5 to 9 em. long, 1.5 to 3 em. broad, those of the terminal pair 7 
to 14 em. long, 2 to 4.5 em. broad. 
Inflorescences single or 2 to 5-clustered in the axils of the upper leaves; 
peduncles angulate, striate, more or less minutely appressed-pubescent, 2 to 6.5 
cm. long; flower heads ovoid, 0.8 to 2 cm. long, the basal flowers deciduous dur- 
ing the elongation; flowers sessile; bractlets subulate, glabrous, 2 to 3 mm, 
long, caducous; calyx tubular, slightly constricted above the base, striate, 
minutely and sparsely pubescent, 6 to 7 (6.5) mm, long, the teeth about 1.5 
mm, long, rounded at the apex; corolla tubular, slightly broadening above the 
calyx, 9 to 11.5 (10.4) mm. long, silky-pubescent, the lobes lanceolate, acute, 
reflexed, 2 to 8 mm. long; staminal tube exserted; style 22 to 23 mm. long, 
glabrous; ovary stipitate, depressed, about 2.5 mm. long; style clavate at the 
apex, 
Legume not known. 
Type in the John Donnell Smith Herbarium, collected in forests in the high- 
lands of Popayin, Colombia, between 1,500 and 2,200 meters, by F. C. Lehmann 
(no. 5751). 
There is a duplicate in the Herbarium of the New York Botanical Garden. 
Also collected near Popayféin, Colombia, at 1,500 to 1,900 meters, flowers, August, 
1881, Lehmann 829, and in Colombia (without exact locality data), Lehmann 
7808. 
While the calyx and corolla agree in size with those of Inga nobilis Willd., the 
stamens and style are much shorter and the pubescence distinct. The flowers, 
besides, are always sessile, with glabrous, subulate bracts. But the funda- 
mental difference is in the lanceolate leaflets, with a larger number of parallel 
veins, hardly apparent venation, and a long, gradually narrowing acumen. Not- 
withstanding these very manifest characters, Micheli* identified this plant (no. 
829) as I. nobilis. 
EXPLANATION OF PLATE 91.—Specimen of Inga popayanensis in the John Donnell Smith 
Herbarium, Lehmann 7808, cited above. Natural size. 
Inga semiglabra Pittier, sp. nov. PLATE 92, 
A tree about 18 meters high (Eggers); branchlets terete, slender, glabrous, 
the younger parts also glabrous or glabrescent. 
Leaves entirely glabrous, the rachis terete, slender, 4 to 8.5 cm. long, the 
petiolar part thicker and dark-colored at the base, 1 to 3 cm. long; leaflets 
3-jugate, membranous, petiolulate; glands small, sessile, orbicular, concave; 
petiolules dark-colored, about 3 mm. long; leaflet blades ovate or obovate to 
lanceolate, long-cuneate at the base, acuminate at the apex, light green above, 
paler beneath, the costa and veins prominent on both sides, but more so be- 
neath, the blades of the basal pair 3.5 to 6 cm. long, 2.5 to 3 cm. broad, those 
of the terminal pair 9 to 14.5 cm. long, 3 to 5 cm. broad. 
Inflorescences axillary or terminal, the spikes single or 2 or 3-clustered; 
peduncles slender, 2.5 to 4 em. long, the flower heads elongating and dropping 
their flowers from the base (rachis 2.5 to 3 cm. long) ; flowers sessile; bractlets 
small, ovate-acuminate, caducous; calyx tubular, slightly broadening toward 
the apex, covered with few minute appressed hairs, 5 to 6 mm. long, the 
obtuse teeth ending with a tuft of (glandular?) hairs; corolla tubular, broad- 
ened above the calyx, 9.3 to 10.7 (9.8) mm. long, glabrous on the lower half, 
minutely pubescent on the exposed upper half, the lobes broad, acute, in- 
flexed, 1 to 2 mm. long; staminal tube short-exserted, the stamens 2 to 2.5 cm. 
long; pistil glabrous, 2.2 cm. long; ovary short, stipitate. 
Legume not known. 
*Bot. Jahrb. Engler 16: Beibl. 37:9. 1892. 
