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ROBINSON, — SPECIES OF MIMOSA. 827 
vigorous shoots) seldom exceeding 4 cm. in length; pinne 4 to 10 
pairs ; leaflets oblong, crowded, ciliate, pubescent, 4 to 5 mm. long: pods 
oblong, straight or nearly so, armed on one or both edges, canescent- 
tomentose, at least when young, obtusish but mucronate-tipped. — Benth. 
in Hook. Jour. Bot. iv. 409, & Trans. Linn, Soc. xxx. 428; Wats. 
Proc. Am. Acad. xvii. 350. M. biuncifera, Torr. Bot. Mex. Bound. 
61, in part, acc. to Wats. Bibl. Index, 243. — Mexico without locality, 
Graham ; San Luis Potosi, Schaffner, no. 6243; Jalisco, Rose, no. 2572; 
Durango, Rose, no. 3491, and (acc. to Benth.) nos. 801 and 308 of 
Mex. Bound. Survey. Bourgeau’s no, 486, referred to this species, 
should be placed in M. biuncifera. 
++ Pods 4 to 6 mm. broad, mostly acute or acutish. 
55. M. prolifica, Wars. Shrub armed with long slender straight 
geminate spreading infra-stipular spines: leaf-rhachis 4 to 6 cm. in 
length, pubescent, armed with hooked spines; pinne about 8 pairs; leaf- 
lets 8 to 18 pairs, oblong, acutish, ciliate or quite glabrous, 3 mm, in 
length: pods copious, falcate, narrowed to a point at both ends, armed 
upon the ventral (convex) suture. — Proc. Am. Acad. xxi. 452. — 
Rocky hills near Chihuahua, Pringle, no. 208 in flower, no. 372 in 
fruit. A species too near the variable WM. biuncifera, and distinguished 
from it chiefly by its larger leaves and long slender straight spines. 
56. M. biuncifera, Bent. Straggling shrub or small tree: 
Spines usually broad, laterally compressed, paired and infra-stipular, or 
single and infra-axillary, or rarely occupying both positions: primary 
leaf-rhachis 6 to 31 mm. long; pinne 8 to 9 pairs; leaflets 5 to 13 pairs, 
oblong, 2 to 3 mm. in length: flowers canescent-puberulent or -tomentu- 
lose: pods about 6-seeded, usually more or less constricted between the 
seeds, puberulent or rarely tomentulose, seldom over 5 mm. broad. — 
Pl. Hartw. 12, in Hook. Jour. Bot. iv. 409, & Trans. Linn. Soc. xxx. 
428; Gray, Pl. Wright. i. 61, ii. 51. — Rocky ground on foothills and 
mountains, W. Texas, Wright, to Arizona, Rothrock, Pringle, Palmer, 
Toumey : Mexico, Chihuahua, Pringle, no, 367 : San Luis Potosi, Parry 
& Palmer, nos. 215, 216; Durango, Palmer, no. 328 (with small fruit), 
594; Jalisco, Pringle, no, 6199; State of Mexico, Andriewx, no. 399, 
Bourgeau, no. 486? Pringle, no. 6308; Oaxaca, Nelson, no. 1571. 
Variation striking but mostly permiscuous and not yet subject to clear 
definition, 
Var. flexuosa. More slender: branches flexuous or almost genicu- 
late: leaflets minute, 1 to 1.5 mm. long: flowers canescent-tomentulose 
4s in the typical form. — Jf fleauosa, Benth. in Gray, Pl. Wright. i. 62, 
. 
