ROBINSON. — SPECIES OF MIMOSA. 323 



■w ->-•• Pubescence not rufous: pod surrounded by a lacerate wing; valves neither 



setose nor spinose. 



40. M. lacerata, Rose. Stout shrub, 15 to 25 dm. high, armed 

 with pairs of dark brown laterally compressed very broad based infra- 

 stipular spines : pinna? 5 to 9 pairs ; leaflets 8 to 17 pairs, canescent- 

 puberulent : legumes brown, oblong, obtuse at the apex and base, 4 to 

 5 cm. long, 1.5 cm. broad, including the lacerate wings. — Contrib. 

 U. S. Nat. Herb. v. 141. — Vicinity of Piaxtla, Puebla, at 1200 m. 

 altitude, Nelson, no. 2008 ; also on limestone hills between Tehuacan, 

 Puebla, at 1850 m. altitude, Pringle, no. 6247 (distributed by clerical 

 error as M. lacerans). 



++ ++ -M- Pubescence rufous, dense. 



41. M. mollis, Benth. Pinnaj 4 to 5 pairs ; leaflets 6 to 10 pairs, 

 oblong, villous upon both sides, 8 to 12 mm. long: heads fascicled at the 

 nodes ; flowers villous. — Benth. in Hook. Jour. Bot. iv. 408, & Trans. 

 Linn. Soc. xxx. 429. — Mexico, Andrieux, no. 400. Species not seen 

 by the writer ; the description compiled. 



42. M. Galeottii, Benth. Tall shrub or small tree, 3.5 to 4.5 m. 

 hio-h, with stoutish flexuous branches : branchlets densely covered with 

 short rufous thickish hairs: spines infra-stipular and geminate or soli- 

 tary : leaves subsessile, 6 to 10 cm. long ; pinnae 20 to 25 pairs, 10 to 

 18 mm. long; leaflets about 16 pairs, 2 to 3 mm. long, nearly glabrous 

 except upon the shortly ciliate margins : peduncles fascicled in the axils, 

 14 to 17 mm. long, copiously and retrorsely pubescent with thick tawny 

 hairs : flowers yellowish turning roseate : pod (ace. to Benth.) broadly 

 linear, glandular-puberulent, setose-prickly upon the sutures, almost 

 naked on the valves. — Benth. in Ilook. Lond. Jour. Bot. v. 92, & Trans. 

 Linn. Soc. xxx. 429. Acacia hirta, Mart. & Gal. Bull. Acad. Brux. 

 X. pt. 2, 318. — Forests of Yolotepeque, western Cordillera of Oaxaca, 

 altitude 2460 m., Galeotti, no. 3165. It cannot be doubted that this 

 species is also represented by Mr. Pringle's no. 6384 collected on moun- 

 tain sides above Cuernavaca at 2150 m. altitude. This number was 

 unfortunately distributed as M. lacerans, Rose, n. sp. ? 



++++++++ Pubescence not rufous: pod (still unknown in M. tenuijiora) often 

 armed upon the margin, but neitlier surrounded by a wing nor setose upon 

 the valves. 



= Pinnae a single pair; leaflets 1 pair on each secondary rhachis, obovate, or 



suborbicular, 2 to 4 mm. in length. 



43. M. zygophylla, Benth. Small much-branched shrub with 

 single intra-nodal spines : petioles short, thickish, somewhat flattened ; 



