470 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
2. Machaerium latifolium (Benth.) Pittier. 
Machaerium acuminatum latifolium Benth. Journ. Linn. Soc. Bot. 4: Suppl. 
65. 1860. 
A tree; branchlets terete, glabrous, sparsely verruculose. 
Leaves 3, 4, or 5-foliolate, glabrous, turning blackish in drying, the rachis 
terete, thick at the base, 9 to 15 cm. long: leaflets subcoriaceous, the petiolules 
canaliculate, black, 4 to 5 mm. long, the blades ovate, rounded or broadly 
cuneate at the base, abruptly and narrowly long-acuminate at the apex (the 
acumen often 2.5 cm. long), 6 to 14.5 cm. long, 8 to 8 em, broad, paler on the 
lower face, densely reticulate-veined ; stipules caducous, wanting. 
Inflorescences racemose, axillary, simple, the rachis glabrous, 2 to 5 em. 
long; bractlets persistent, small, broader than long, concave; flowers sessile, 
their structure not known, 
Legume 10 to 11.5 em. long, stipitate (the stipe minutely pubescent, 4 to 8 
mm. long), the seminal part straight, at first pubescent, later glabrous, about 8 
cm. long and 2 ent. broad, the blade cultriform, obtuse, 2.5 to 8 ecm. broad: 
seed ovate-scutellate, depressed, about 1.5 cm. long, 2 to 2.5 cm. broad, attenuate 
toward the base of the pod, broadly obtuse at the other end, with a narrow 
notch on the carinal margin, this corresponding with the insertion of the 
hilum. 
The description is drawn from specimens collected in the forests of Santo 
Domingo de Osa, Costa Rica, in fruit, March, 1896, by A. Tonduz (Inst. Ffs. 
Geogr. Costa Rica, no. 10069). The same species has been reported from Nica- 
ragua (Oersted), Jalapa, Mexico (Galeotti), and Mount Orizaba, Mexico 
(Botteri 1081). 
Bentham considered this only a variety of Machaerium acuminatum, a con- 
clusion in which I can not concur, for the leaves and fruits are constantly 
larger, and the leaflets of different shape. The flowers will probably furnish 
good differential characters. These two species, with M. brasiliense, form a 
distinct group of closely related species. 
3. Machaerium darienense Pittier, sp. nov. 
A small unarmed tree; branchlets terete, lenticellate, glabrous (in the fruit- 
ing specimens). 
Leaves 7-foliolate, the rachis slender, subterete, 6 to 10 cm. long, minutely 
grayish-pubescent; leaflets subcoriaceous, the peticlules terete, glabrous, 4 to 
5 mm. long, the blades ovate or oblong, broadly cuneate or rounded at the base, 
obtusely acuminate at the apex, 5 to 8 cm. long, 2 to 3.5 em. broad, glabrous and 
prominulous-reticulate above, prominulous-reticulate and sparsely grayish-pu- 
bescent along the costa beneath; stipules not seen, 
Inflorescences axillary or terminal, the rachis fuscous-pubescent, 3 to 7 em, 
long, simple or ramified; bractlets persistent, pubescent, cucullate; flowers ses- 
sile; bractlets pubescent, about 1.5 mm. long and much broader; calyx about 
38 mm. long, sparsely pubescent, striate; standard minutely grayish-pubescent 
without; filaments glabrous; anthers ovoid-globose; other details of the flower 
not known, 
Legume 5 to 5.5 cm. long, long-stipitate (the stipe about 7 mm. long), fer- 
ruginous-pubescent, the seminal part straight, about 2 em. long, 1 em. broad, 
the wing cultriform, rounded, mucronulate, 1.4 cm. broad; seed oblong, com- 
pressed, rounded-obtuse at both ends, about 7 mm. long, 14 mm. broad. 
Type in the U. S. National Herbarium, no. 715748, collected in the vicinity of 
La Palma, southern Darién, Panama, in fruit, January 26, 1912, by H. Pittier 
(no. 5497). 
