ROBINSON. — SPERMATOPHYTES OF MEXICO. 473 



to 30 pairs linear-oblong, 5 to 8 mm. long, 1.6 mm. wide, acutish, oblique 

 at the base, finely appressed-pubesceut upon both sides : flowers capitate, 

 heads globose, 1.3 cm. in diameter; peduncles filiform, 1.5 cm. long, 

 borne b}' twos and threes in the axils of the upper leaves : calyx turbinate- 

 campanulate, scarious, slightly cuspidate-toothed, 0.8 mm. long: corolla 

 2.3 mm. long, glabrous, not conspicuously ribbed : stamens 8 or 10 : 

 pod 4.5 cm. long, 1.2 era. broad, unarmed, glabrous, dark colored, ob- 

 lanceolate, acute, thickisb ; valves not segmented. — Collected by Dr. 

 J. N. Rose in the foothills of the Sierra Madre, near Colomas, State 

 of Sinaloa, Mexico, 21 July, 1897, no. 1805. Type in herb. U. S. 

 Nat. Museum ; fragment in lierb. Gray. To this species I should refer 

 also Dr. Rose's no. 3157, collected on a road between Acaponeta and 

 Rosario. While it is more copiously armed it shares all important char- 

 acteristics with the plant from Colomas. The species is readily distin- 

 guished by its smooth unjointed fruit and axillary inflorescence. 



Mimosa ionema. Shrub or small tree 3 to 5 m. high ; branches 

 unarmed, terete or nearly so, puberulent ; branchlets green, angled and 

 costate, tomentulose : stipules filiform, 8 mm. long, tomentulose under a 

 lens ; petioles angled, straight, puberulent-tomentulose, 4 to 6 cm. long, 

 equalled by the foliar rachis; pinnae 4 to G subremote pairs, 5 cm. long, 

 the lower ones commonly alternate ; stipels 1 mm. long ; leaflets about 

 15 pairs, oblong, obtuse, green and nearly or quite glabrous upon both 

 surfaces, slightly paler beneath, oblique at the base, excentrically 1-nerved, 

 pinnately veined, 1 cm. long, 3 to 4 mm. broad : flowers loosely spicate, 

 spreading or somewhat deflexed ; spikes fascicled by 3's and 4's in the 

 axils of the upper leaves, ascending, 6 cm. long, on penduneles 2 to 3 cm. 

 in length: corolla white or pale yellow, 2.5 mm. long, cleft to below the 

 middle, without conspicuous nerves or ribs, glabrous ; segments 4 to 5, 

 lance-oblong, acutish: stamens 8 to 10; filaments violet-tinged: fruit 

 (immature) narrowly oblong, acute at both ends, thin, glabrous, 5 cm. 

 long, 7 mm. broad, about 8-seeded. — Collected by C. G. Prin"-le in the 

 valley below Cuernavaca, Mexico, altitude 1,230 m., 17 October, 1900, 

 no. 8377. Type in herb. Gray. 



Mimosa Watsoni. Fruticose and probably scandent : stems sub- 

 terete, tomentulose chiefly along six longitudinal lines, these bearino- 

 minute approximate subequal very short recurved spines : branchlets 

 grayish-tomentose : petioles (including the rachis) 5 cm. long, rigid, 

 angled, armed laterally and ventrally by 2 or 3 lines of recurved spines, 

 tomentulose especially along the armed angles ; pinnae 2 pairs ; the 

 lower bearing 1 or 2 pairs of leaflets, the upper with 2 or 3 pairs ; 



