822 PROCEEDINGS OF THE AMERICAN ACADEMY. 
dier, nos. 831, 2251, 3145; Coahuila, Gregg, Palmer, no. 290 (coll. of 
1880), Pringle, no. 217; Guanajuato, Dugés ; Aguas Calientes, Hart- 
weg, no. 70 (type) ; Jalisco, Rose, nos. 8572, 83665; Michoacan, Pringle, 
no. 3733; Oaxaca, LZ. C. Smith, no. 18. 
_- 837. M. Emoryana, Benrs. Branchlets tomentulose; spines 
single but borne usually at the side of (not often beneath) the axils: 
leaves small, appressed-tomentulose and cinereous ; rhachis scarcely over 
6 mm. in length ; pinne about 2 pairs, crowded, 8 mm. long ; heads glob- 
ose: young fruit as in the last. — Trans. Linn. Soc. xxx. 426. — Gravelly 
hills near the Cibolo of the Rio Grande, Bigelow, 28 July, 1852, no. 
312, which was the type number, although it was cited in the original 
description by clerical or typographical error as no. 302; also foothills 
of the Chisos Mts., W. Texas, Havard, no. 18. 
38. M. minutifolia, Ros. & Greenm. Shrub armed with straight 
or slightly recurved infra-stipular subaxillary or scattered spines: pinn® 
10 to 20 pairs; leaflets numerous, not over 1 mm. in length, pubescent 
upon the edge and lower surface: valves tough, oblong, not constricted 
between the seeds, apparently falling away entire, at first somewhat 
canescent-tomentulose as well as covered with tawny or rufescent set®. 
— Am. Jour. Sci. ser. 3, 1. 150.— Rocky hills, Rio Blanco, Jalisco, 
Pringle, no. 5142, and near Colotlan, Rose, no. 2673; the specimens 
of both collections are in fruit. 
= = Pod lanceolate, 2 cm. broad. 
_ 89. M.eurycarpa, Small tree, 4 to 6 m. high, glabrous or puberu- 
lent, sparingly armed with scattered spines or unarmed: branches red- 
dish brown; branchlets green, angulate: stipules setaceous: leaflets 
narrowly oblong, 6 to 8 mm. in length, 2 mm. in breadth, 1-nerved, 
rounded at the apex, deep green upon both surfaces: heads numerous, 
small, fasciculate, racemose at the ends of the branchlets; bracts short 
scarcely showing in the young heads: calyx fully half the length of 
the glabrous white 5-lobed corolla: stamens 10: pods large, lance 
oblong, acuminate, 6 to 7 cm. long, 2 cm. broad ; stipe long and slender ; 
valves echinate, separating entire from the replum, which is weakly 
armed on one side. — Collected by Z. W. Nelson between Guichocov! 
and Lagunas, Oaxaca, at 175 to 275 m. altitude, 27 June, 1899, 00 
_ 2741; also between La Venta and Niltepec, at 60 m. altitude, 14 July, 
1895, no. 2798. Mr. Nelson’s no. 955 without fruit is probably the 
same, © 
