OF AETS AND SCIENCES. 427 



Mimosa laxiflora, Benth. ? A shrub, 8 feet high, with stout 

 scattered recurved prickles or the slender branches sometimes un- 

 armed, glabrous : pinnae 2 or 3 pairs ; leaflets 2 to 4 pairs, oblong to 

 broadly elliptical or semicordate, 2 to 4 lines long : flowers pentame- 

 rous, pedicellate, in short loose shortly pedunculate spikes ; stamens 

 10: pod unarmed, thin, about 20 lines long by 3 broad. — Differing 

 slightly from the description of the original of the species collected by 

 Coulter in northern Sonora. As suggested by Bentham, it is probably 

 the same as Acacia prosopoides, DC. Same locality (41) ; found also 

 by Pringle in 1884 in the mountains of northwestern Sonora. 



Leuc.ena lanceolata. Resembling L. retusa: a shrub, 5 feet 

 high, finely pubescent : leaves with a prominent gland above the base 

 of the long petioles ; pinnee 2 or 3 pairs ; leaflets 6 or 7 pairs, lanceo- 

 late, very acute, finely pubescent, | to 1 inch long, a small gland below 

 the upper pair: peduncles \h inches long: flowers white, in large 

 heads. — Hacienda San Miguel (6). L. retusa is more glabrous, the 

 leaflets mostly obtuse or retuse, the shorter petiole with a gland be- 

 tween the lower pinnae, and the pinnae glanduliferous between each 

 pair of leaflets. 



Acacia millefolia. A shrub or small tree, 10 feet high, with 

 slender branches and armed with slender ascending stipular prickles 

 (1 or 2 lines long), sparingly pubescent : rhachis of the leaves sulcate: 

 pinnae 5 to 10 pairs, about an inch long ; leaflets 25 to 35 pairs, linear, 

 acute, 1 or 1| lines long: peduncles axillary, bearing loose spikes (1 

 or 1 1- inches long) of white or pale yellow flowers : pod chartaceous, 

 thin and flat, somewhat curved, 3 to 5 inches long and 9 lines wide, 

 5-10-seeded, stipitate : seed round, flat, 3 or 4 lines broad. — Hacienda 

 San Jose (45) ; first discovered by C. G. Pringle in July, 1884, in 

 flower only, on the foot-hills of the Santa Rita Mountains, Arizona. 

 Nearest to A. Emoryi. 



Acacia cochliacantha, Humb. &, Bonpl. A small tree, 10 feet 

 high, with stout cochleate spines (i to nearly 2 inches long), and fra- 

 grant orange-colored flowers in small globose heads : pods glabrous, 

 thin-coriaceous, indebiscent (?), flattened, falcate, 3 inches long by 4 

 lines broad, stipitate, about 12-seeded. — Hacienda San Miguel (71). 



Calliandra grandiflora, Benth. — Hacienda San Jose (36) 

 and Frayles (266). 



Calliandra reticulata, Gray. — Norogachi (370). 



Calliandra Coulteri, Watson. — Pods glabrous, 3 inches long 

 and 3 lines wide, the valves thin. — Hacienda San Miguel, in flower, 

 and later in fruit (16, 223). These fruiting and flowering specimens 



