ROBINSON. —SPECIES OF MIMOSA. 325 
high, in technical characters too close to the last preceding species, but 
with much more developed foliage: pinne 1 to 3 pairs, oblong, 2 to 3 
cm. in length; leaflets in about 6 somewhat remote pairs, oblong, 4 to 
6 mm. in length: legumes curved, about 5 cm. long, slightly or not at all 
W. Texas, Lindheimer, nos. 606, 607, Wright, no. 1037, Reverchon, 
no. 717 * (of Curtiss’ distrib.), Havard, no. 63, Heller, no. 1594. 
b. Branchlets, petioles, or at least rhachises puberulent to tomentose. 
1. Pods thin and soft in texture, wholly unarmed, 4 to 5 mm. broad, velvety 
entose. 
-— 48. M. calcicola. Shrub 6 to 9 dm. high: branches gray, flexu- 
ous, armed with solitary recurved subaxillary spines: pinne 2 to 3 
pairs; leaflets elliptic-oblong, 2 to 3 pairs, subdistant, at least not 
crowded, pale green, puberulent, concolorous, 3 to 5 mm. long: pedun- 
cles axillary, solitary, puberulent, 8 mm. long; flowers pubescent, white 
or nearly so: pods 3 to 4 cm. in length, about 6-seeded, slightly con- 
stricted between the seeds, light colored, permanently canescent-tomen- 
tose. — Collected by C. G. Pringle, on calcareous plains of Tehuacan, 
State of Puebla, at 1525 m. altitude, 29 July, 1897, no. 6765 (dis- 
tributed as AZ, depauperata ?) 
2. Pods coriaceous, more or less armed upon one or both edges. 
© Pinne | to 2 or rarely 3 pairs; leaflets 2 to 6 pairs. 
“49. M. depauperata, Bentu. Low rigidly branched shrub, 
becoming 1 m. high, finely canescent-puberulent: spines single, sub- 
axillary: leaves very small; pinne a single pair; leaflets 2 or 3 pairs, 
ovate, not 2 mm. in length; common petiole 6 mm. long, somewhat 
flattened: peduncles 5 mm. in length: "flowers canescent- pubescent : 
young pods stipitate, 6-jointed, canescent-pubescent upon the valves, 
aculeate upon one edge, distinctly constricted between the seeds. — 
Benth. Pl. Hartw. 13, in Hook. Jour. Bot. iv. 410, & Trans. Linn. Soe. 
xxx. 425. Acacia canescens, Mart. & Gal. Bull. Acad. Brux. x. pt. 2, 
312. — Plains of Actopan, Mexico, Graham (fragmentary specimen in 
herb. Gray); Mexico without locality, Karwinski ace. to Benth. ; also 
from hills near San Juan del Rio, Queretaro, Pringle, no. 6352, showing 
young fruit as above described. A specimen collected on a gravelly 
mesa near Presidio, Texas, Havard, no. 75, has mature glabrate con- 
stricted pods (7 mm. in breadth) and the reduced foliage of this species, 
but somewhat longer peduncles and smoother flowers. Near to ed 
