116 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Machaerium glabratum Pittier, sp. nov. FIcure 53. 
An armed shrub (or tree?), the branchlets at first sparsely ferruginous- 
pubescent, later glabrous, grayish, verruculose. 
Leaves 13 or 15-foliolate, the rachis 3.5 to 14 cm. long, slender, angular, 
hairy along the dorsal side. Leaflets subcoriaceous, glabrous, the petiolules 
about 0.5 mm. long. the blades oblong, rounded at the base, more or less retuse 
at the apex, 7 to 15 mm. long, 3 to 5 mm, broad, dark green above, paler be- 
neath; veins crowded, parallel, slightly arcuate, not anastomosed, running 
into the marginal nerve. Stipules indurate-spinescent, narrow and acute, 
glabrous, about 5 mm. long. 
Inflorescence paniculate, terminal, broad, 20 to 35 cm. long, the branchlets 
longer than the leaves, the rachis more or less puberulous; peduncles (branch- 
lets of the second order) solitary or ternate, 3 to 10-flowered, 0.5 to 1.5 em. 
long. Bracts more or less indurate, triangular-acute, more or less pubescent, 
subcaducous; bractlets scarious, caducous. Pedicels more or less ferruginous- 
pubescent, 2 to 2.5 mm. long. Flowers about 8 mm. long. Calycinal bractlets 
orbicular, puberulous or glabrous, minutely ciliate, 2 to 2.5 mm. long and broad. 
Calyx campanulate, gibbous-dilated on the vexillar side, 5 mm, long, purple, 
glabrous or minutely pilosulous, the teeth very short, 
rounded. Petals purple, glabrous; standard reflexed, 
ovate or obovate, the claw very short (hardly over 0.5 
mm. long), the blade obovate or suborbicular, rounded 
at the base, rounded-emarginate at the apex, about 5.5 
mm. long, 8 mm. broad; wings strongly oblique, arcuate, 
the claw 1.5 to 2 mm. long, the blade obovate, 
j-auriculate at the base, obtuse, about 8 mm. long, 3 to 
3.5 mm. broad; carinal petals strongly falcate-arcuate, 
the claw 1 to 1.5 mm, long, the blade 1-auriculate, sub- 
a5) acute, about 9 mm. long, 3.5 mm, broad. Stamens mon- 
Via. 5%.-—Floral details adelphous, the tube and filaments strongly arcuate, the 
of Machaerium gla- anthers ovoid. Ovary l-ovulate, stipitate at the base, 
vratum. a,Standard: flat-compressed, tomentellous or pubescent, provided at 
b, nes C, carina the base with a short tubular disk; style about 2.5 mm. 
ovary. Natural else, long, glabrous. 
From type specimen. Fruit not known, 
Type in the U. S. National Herbarium, no. 532839, 
collected in Santa Marta, Colombia, in flower, in October, 1898, by H. H. Smith 
(no. 264). Other specimens by the same collector and from the same locality 
under no, 2032, 
Distributed as Machaerium acaciaefolium Mart. This, according to Bentham, 
is the same as M. angistifolium Vog., the first name possibly having the 
priority. The Santa Marta shrub disagrees with the Brazilian species in the 
shape of the stipules and leaflets, the latter being smaller and paler on the 
lower face, in the size of the flowers, and in the short claws of the glabrous 
petals, the monadelphous stamens, the relatively light pubescence of the ovary, 
ete. Even conceding a very broad margin of variation to M. angustifolium, it 
is hard to see how these specimens could be identified with this species. 
Machaerium humboldtianum Vog. Linnaea 11: 194. 1837. Figure 54. 
A tree 4 to 7 meters high (Humboldt) or a vine (Pittier), the branchlets 
terete, striate, glabrous, puberulous, or minutely pubescent. 
Leaves 5 or 7-foliolate, glabrous or more or less pubescent, the rachis 5 to 
9 cm. long, thickening at the base. Leaflets coriaceous, the petiolules sub- 
canaliculate, 2 to 5 mm. long, the blades obovate, ovate, or elliptic, usually 
