ROBINSON. — SPECIES OF MIMOSA. 325 



hif^h, in technical characters too close to the last preceding species, bat 

 with much more developed foliage : pinnge 1 to 3 pairs, oblong, 2 to 3 

 cm. iu 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 

 armed ; segments 5 to 7. — PI. Lindh. pt. 2, 182, as to plant of Liudh. ; 

 Benth. Trans. Linn. Soc. xxx. 426. — Thickets on rocky soil, S. and 

 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 



tomeutose. 



48. M. calcicola. Shrub 6 to 9 dm. high : branches gray, flexu- 

 ous, armed with solitary recurved subaxillary spines : pinnae 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 G. G. Primjle, on calcareous j^lains of Tehuacan, 

 State of Puebla, at 1525 m. altitude, 29 July, 1897, no. 6765 (dis- 

 tributed as M. depauperata ?) 



2. Pods coriaceous, more or less armed upon one or both edges. 

 o Pinnae 1 to 2 or rarely .3 pairs ; leaflets 2 to 6 pairs. 



49. M. depauperata, Benth. Low rigidly branched shrub, 

 becoming 1 m. high, finely canescent-puberulent : spines single, sub- 

 axillary: leaves yery small; pinna3 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. PI. Hartw. 13, in Hook. Jour. Bot. iv. 410, & Trans. Linn. Soc. 

 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 and 



