196 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Inga mucuna Walp. & Duchass., reduced to J. lindeniana by 
Bentham, is evidently a distinct species, related perhaps to J. poeppi- 
giana from Peru, which I have not seen, but from which it differs in 
having 4 instead of 3 pairs of leaflets, while the spikes, instead of 
being sessile, are long-pedunculate. The specimen in the Gray Her- 
barium is evidently part of the type collection. It has the broadly 
ovate leaflets, abruptly contracted into a linear acumen, a character 
given as specific in the original description but not apparent in our 
specimens; these, however, agree exactly in the dimensions of the 
flowers and in the particulars of the fruits. If the synonymy given 
by Bentham were exact, Walpers’s name would have the priority, but 
the two species are quite distinct. In J. mucuna the calyx is 94 and 
not 5 to 8 lines long, and the corolla 224 lines, i. e. nearly 2 inches, 
and not almost 1 inch long. 
The bractlets of 7nga mucuna can hardly be said to be persistent, 
for which reason it takes its place with the Longiflorae. The de- 
scription is as follows: 
Inga mucuna Walp. & Duchass. Walp. Ann. Bot. 2: 459, 1851-52. 
A middle-sized tree with spreading crown; branchlets angulate, the bark 
brownish, lenticellate, the young shoots densely ferruginous-hairy. 
Rachis of the leaves winged, densely covered with light brown or golden 
brown strigose hairs, 11 to 22 em, long, the petiolar part nude or narrowly 
winged, 2.5 to 3.5 cm. long, the wings broad (1.7 to 3.5 cm.), attenuate or long- 
cuneate toward the base, rounded at the tip, distinctly veined transversely, the 
pubescence as in the blades; stipules cordiform, acute, persistent, 5 to 8 mm. 
long; leaflets 2 to 4-jugate, membranous, petiolulate; glands very small, sub- 
sessile, brownish, with a dark pit; petiolules about 3 mm. long, very hairy; 
leaflet blades ovate-orbicular to ovate, broadly rounded at the base, usually 
acute at the apex but sometimes abruptly contracted into a narrow, long- 
mucronate acumen, dull and strigose above except on the densely hairy costa, 
tomentose-pubescent beneath, with the densely hairy costa and veins prominent ; 
leaflet blades of the basal pair 6 to 11.5 em. long, 4 to 5 em. broad, those of the 
terminal pair 10 to 17.5 cm. long, 6.5 to 11 cm. broad. 
Inflorescences axillary, single, long-pedunculate; peduncles 5 to 8 em. long, 
densely light brown hairy like the rachis; flower heads dense, 3 to 4 cm. long ; 
flowers sessile; bractlets elliptic, acute, densely hairy, about 6 mm. long, cadu- 
cous ; calyx tubular, striate, 2 cm. long, glabrous except on the tips of the short 
teeth; corolla long-tubular, slightly broadened at the apex, white and white- 
villous, 4.5 to 5 em. long, the lobes narrow, not over 7 mm. long; staminal tube 
slender, long-exserted (nearly 6 cm. long); pistil about 12 em. long; ovary 
sessile, about 5 mm, long; stigma capitellate, flattened at the apex, 
Legume spirally twisted, rarely plane, sessile, up to 30 em. long, 5 cm. broad, 
rounded at the base, obtuse at the apex, densely ferruginous-strigose, the mar- 
gins rounded and deeply sulcate along the line of dehiscence; seeds numerous. 
PANAMA: Panama, 1850, Duchassaing (type). Banks of the Sambti River, 
southern Darién, near the limit of the tide, flowers and fruits, Feb- 
ruary 1, 1912, Pittier 5525. 
The leaf and fruit specimens from the lower Orinoco, distributed by Rusby 
and Squires as Inga mucuna, seem to belong to still a third species, but in the 
