476 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Inflorescences paniculate, terminal, very large (up to 40 em. long), the main 
rachis thick, glabrous, sparsely lenticellate, the branchlets up to 25 em. long, 
sparsely hairy; peduncles (branchlets of the second order) geminate, ferrugi- 
nous-hairy, 4 to 8-flowered, 1.5 to 3 em. long; bracts and bractlets scarious, 
lanceolate, pilosulous, early deciduous; pedicels hairy, 1.5 to 2 mm. long; 
flowers about 9 mm. long; bractlets ovate, obtuse or subacute, glabrous or pilo- 
sulous, 3 to 3.5 mm. long, 2 to 2.5 mm. broad; calyx campanulate, 5.5 to 6.5 
mm. long, purple, glabrous or sparsely villous on the margin, the carinal tooth 
longer, rounded, the vexillar teeth also rounded, broader and irregular; petals 
purple; standard reflexed, densely gray-villous without, the claw oblique, about 
1.5 mm. long, the blade ovate-oblong, rounded and broader at the base, emargi- 
nate with rounded lobes at the apex, about 10.5 mm. long, 9 mm. broad ; wings 
long and narrow, glabrous, the claw about 2.5 mm. long, the blade oblique- 
oblong, arcuate, 1 or 2-auriculate at the base, 8 to 9.5 mm. long, 3 mm. broa2; 
carinal petals strongly arcuate, glabrous, 1-auriculate, the claw as in the wings, 
the blade about 9 mm. long and 2.5 to 3 mm. broad; stamens monadelphous, 
glabrous, the filaments thicker than the oblong anthers; ovary 1-ovulate, stipi- 
tate, strongly arcuate, densely grayish villous-tomentose, provided at the base 
with a glabrous tubular disk ; style very short (about 0.7 mm. long), glabrous. 
Fruit wanting. 
Type in the John Donnell Smith Herbarium, collected in forest along Rio 
Ceibo, near Buenos Aires, Diquis Basin, Costa Rica, altitude about 300 meters, 
flowers, February, 1891, by A. Tonduz (Inst. Fis. Geogr. Costa Rica, no. 3816). 
Determined as Machaerium lanatum Tulasne by Micheli, but differing in the 
number and venation of the leaflets, the general indument, the pedicellate 
flowers, and the size of the panicles. It is related to M. purpurascens. 
12. Machaerium cobanense Donn. Smith, Bot. Gaz. 44:108, 1907. 
A trailing armed shrub, the-stems up to 10 meters long; branchlets terete, 
lenticellate, at first grayish-tomentose. 
Leaves 13 to 19-foliolate, the rachis slender, 9 to 15 cm. long, tomentulose ; 
leaflets coriaceous, the petiolules brownish-hairy, 1 to 2 mm, long, the blades 
oblong, rounded or subacute at the base, obtuse or subacute and mucronulate 
at the apex, 1 to 5.5 cm, long, 0.4 to 2.5 em. broad, dark green and more or less 
puberulous above, paler and tomentulose beneath, the veins more or less 
straight, anastomosing and running into the marginal nerve; stipules indurate- 
spinescent, recurved, acute, up to about 5 mm. long, caducous. 
Inflorescences terminal, paniculate, up to 80 cm. long, the rachis densely 
yellowish-hairy ; peduncles (branchlets of the second order) usually simple, 
3 to 5-flowered ; bracts stipule-like, caducous; bractlets not Seen ; pedicels hairy, 
1 to 3.5 mm. long; flowers 12 to 13 mm. long; bractlets orbicular, yellowish- 
hairy, 2 to 2.5 mm. long, 3 mm. broad; calyx tubular-campanulate, about 6 mm. 
long, hairy, the 3 lower teeth narrow and subacute, the 2 vexillar ones very 
broad and short; petals purplish; standard densely gray-pubescent without, the 
claw broad, 1.5 to 2 mm. long, the blade suborbicular, more or less attenuate 
at the base, broadly rounded and emarginate at the apex, about 7.5 mm. long, 
8.5 to 9 mm. broad; wings obovate, oblique, not auriculate, glabrous, the claw 
2.5 to 3 mm. long, the blade obtuse, 7 mm. long, 4 mm. broad; carinal petals 
slightly falcate, auriculate, glabrous, the claw 3 mm. long, the blade about 5 
mm, long and 3 mm. broad; stamens monadelphous, glabrous, the anthers ovoid; 
ovary 1-ovulate, straight, Stipitate, villous, provided at the base with a short 
tubular disk; style glabrous, incurved, about 0.8 mm. long. 
Fruit not known. 
