PITTIER—PLANTS FROM COLOMBIA AND CENTRAL AMERICA. 473 
the blades oblong, rounded at the base, obtuse or slightly emarginate at the 
apex, 4 to 8 mm. long, 1 to 3 mm. broad, villous at the base above, paler and 
sparsely villous all over beneath, the veins distant, distinctly anastomosing, 
running into the marginal nerve; stipules mostly scarious, sometimes indurate, 
lanceolate-acuminate, densely ferruginous-pubescent without, caducous or sub- 
persistent. 
Inflorescences axillary, 5 to 15 cm. long, subpaniculate or the peduncles in- 
serted directly on the main rachis; rachis densely ferruginous-tomentose ; 
peduncles 8 to 10-flowered; bracts stipule-like; pedicels 3 to 5 mm. long; 
bractlets orbicular, about 4 mm. long and broad; calyx campanulate, about 7 
mm. long, densely ferruginous-hairy; standard densely grayish-hairy without. 
Legume 5 to 5.5 em. long, not stipitate, the seminal part 1.5 em. long and 1.8 
cm. broad, densely villous-tomentose with brown and yellow hairs, the wing 
obovate, subcultriform, more or less villous or pilosulous, about 1.8 em, broad. 
Type in U. S. National Herbarium, no. 678106, collected near Penonomé, 
Province of Coclé, Panama, March, 1908, by R. S. Williams (no. 409). 
This species belongs to the section Oblonga, but its affinities are doubtful and 
are difficult to determine in the absence of flowers. 
8. Machaerium acanthothyrsus Pittier, sp. nov. 
A tree (7); branchlets terete, glabrous. 
Leaves 9-foliolate, the rachis glabrous, subterete, 5 to 10 cm. long; leaflets 
coriaceous, subopposite, the petiolules 1 to 2 mm, long, glabrous or pilosulous, 
the blades broadly ovate or (in the terminal leaflet) obovate, rounded or (in 
the terminal leaflet) cuneate at the base, broadly rounded, emarginate, and 
distinctly mucronulate at the apex, 2 to 5.5 cm. long, 1 to 2.5 cm, broad, 
glabrous, paler beneath, the veins numerous, parallel, profusely anastomosing ; 
stipules indurate-spinescent, lanceolate, acute, recurved, glabrous, up to 5 mm. 
long. 
Inflorescence terminal, paniculate, up to 80 cm. long, the rachis (in the 
fructiferous panicle) glabrous; peduncles (branchlets of second order) short, 
ferruginous-pubescent, few-flowered ; pedicels ferruginous-pubescent, 3 to 4 mm. 
long; bracts conspicuous, indurate-spinescent, straight or more or less pubescent 
at the base, smooth and sharp-pointed at the apex, up to 4.5 mm. long; bract- 
lets caducous, not seen; calyx persistent, tubular-campanulate, about 4 mim, 
long, ferruginous-pubescent; other details of the flower not known. 
Legume 6 to 7.5 cm. long, long-stipitate (the stipe 8 to 9 mm. long, pubescent), 
the seminal part 2 to 2.5 cm. long, 0.9 cm. broad, curved, tuberculate over the 
seed, sparsely pubescent, the wing membranous, cultriform, obtuse, reticulate, 
12 to 15 mm. broad. 
Type in the U. S. National Herbarium, no. 1,059,397, collected on the road 
between Hacienda del Capricho, Guerrero, and Llano Grande, Oaxaca, Mexico, 
altitude 65 to 100 meters, February 16, 1895, by E. W. Nelson (no, 2331). 
Very closely related to Machaerium langlassei Micheli, collected in the same 
region, but differing in indument, number and shape of leaflets, and rather 
profusely aculeate panicle. If the fruit specimen described for the latter 
species has been correctly identified, other differential characters may be found 
in the fruits. 
9. Machaerium langlassei Micheli, sp. nov. 
An unarmed tree, 5 to 12 meters high, with rounded crown; branchlets 
terete, at first densely ferruginous-pubescent. 
Leaves 18 to 21-foliolate, the rachis 10 to 18 cm. long, angular or subterete, 
at first densely ferruginous-pubescent, later glabrous or glabrescent; leaflets 
coriaceous, the petiolules 2 to 3 mm, long, pubescent, the blades oblong, 
