468 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Petiolules 2 mm. long; filaments villous; legume short-stipitate (stipe 4 
to 5 mm. long), at first minutely pubescent; leaflets 7 to 11, 1.5 to 
5 cm, long, 0.7 to 2 cm, broad. Costa Riea, Panama, Colombia. 
4, M. seemanni. 
Leaflets numerous (13 and over, or fewer but then broadly rounded or emargi- 
nate at the apex), small to medium-sized (mostly less than 7 em. long), 
rounded, obtuse, or emarginate at the apex, the veins close together, with 
the interspaces hardly or not at all reticulate. 
Leaflets small (not over 1.5 em. long), numerous, glabrous, the primary veins 
very close, parallel, not anastomesing. LINEATA. 
Legume glabrous, the seminal part torulose; leaflets 25 to 45; rachis of 
the leaves hairy on the dorsal side only; stipules glabrous. Panama. 
5. M. glabripes, 
Legume densely golden-setulose, the seminal part broad and flat; leaflets 41 
to 65; rachis ferruginous-tomentellous all over; stiples ferruginous- 
hairy at first. Panama_____-_--..- 6. M. cirrhiferum. 
Leaflets usually medium-sized (1 to 7 em. long), rarely very small (4 to 
8 mm. long), glabrous or hairy, the primary veins not very close together, 
sparsely but distinctly anastomosing. OBrLoNnaa. 
Leaflets 31 to 61, 4 to 8 mm. long; stipules scarious or sometimes indur- 
ate, densely ferruginous-pubescent; seminal part of the pod yellowish- 
villous. Panama____-...----------- 7. M. arborescens. 
Leaflets usually less numerous and larger (1 to 7 cm. long); stipules in- 
durate-spinescent, hairy or glabrous, sometimes caducous, 
Leaflets ovate-oblong or obovate, obtuse or emarginate at the apex, 
glabrous, at least on the upper face. 
Leaflets obovate, deeply emarginate at the apex, entirely glabrous. 
Pod long-stipitate, the seminal part minutely pubescent. Mexico. 
8. M. acanthothyrsus. 
Leaflets ovate-oblong, obtuse or retuse at the apex, more or less hairy 
on the lower face. 
Plant an unarmed tree; rachis of the inflorescence ferruginous-pubes- 
cent; flowers 12 to 13 mm. long, violet; seminal part of the pod 
broad and thick, more or less setulose. Mexico. 
9. M. langlassei. 
Plant a trailing armed shrub; rachis of the inflorescence more or 
less tomentose; flowers 6 to 7 mm. long, dark purple; pods glab- 
rous at maturity. Panama____________ 10. M. purpurascens. 
Leaflets oblong, rounded or subacute at the apex, more or less hairy on 
both faces. 
Inflorescences very large (up to 40 em, long), the rachis glabrous or 
sparsely hairy. Leaflets 41 to 55, very narrow (5 to 8 mm. 
broad), villous-tomentose on both faces. Costa Rica. . 
11. M. costaricanum. 
Inflorescences not over 30 cm. long, the rachis densely hairy, some- 
times setulose. 
Leaflets 13 to 19, obtuse or subacute and mucronulate at the apex, 
puberulous above, tomentellous beneath; flowers 12 to 13 mm. 
long. Guatemala... 12, M. cobanense, 
Leaflets 31 to 41, rounded or more or less emarginate at the apex, 
villosulous on both sides ; flowers 9 to 10 mm. long. Mexico; 
Guatemala______--- 13. M. setulosum. 
