33 CONTRIBUTIONS TO WESTERN BOTANY 
Alchemills hirsuta HBK, It was qnite surprising to find this 
apecies abundant on the laguna, another link with the western flo- 
PithecoNobium minutum n, sp. No. 27265, Ca- 
cachilla mts. Oct. 2 1930. An open bash, 6-3 ft. high, with inch- 
long atraight spines in pairs. Leaves nearly as broad as long, 3 
inches long, of about 6 pairsof pinne which sre about an inch 
ong and open and 1 cm, wide. Leaflets about 13 pairs, linear, a 
little arcuate, Ll mm. wide by 4 mm long, minutely pubescent. Pod 
nearly black, 4 inches long by half an inch wide and 4-6 mm. 
thick, and oval in cross-section, smooth, trianguiar-acute and 
short-stipitate, with ring-like base. Branches slender and spread- 
ing a8 in Mimosa biuncifera. 
Pithecolobium minutissimum n. sp. No. 272¢6 
La Barranca Guadalajara Mex. Nov. 251930. A small tree rough- 
ly branched and spiny at the nodes, closely short-woolly through- 
out with rough bark. Leaves 4-6 incheslong by 1-1.5 inches wide, 
bipinnate, with stout petiole half an inch long, and with rachis 
Leaflets about 30 pairs, imbricated, oblong, obtuse, m y 
seaves Clustered at the ends of the stout twigs. Fruit 
Above Primiera Agua, in the Sierra Giganta, Oct 20 1930. A 
shrub 4-6 ft high with stems beset with chestnut colored or white 
warts. Leaves a pair of pinne, with about & pairs of leathery ve- 
§ by 3 mm. wide, blunt but 
apioulate, often arcuate, oblong, with midrib set in the middle 
th essory veins below it, half-cordate below, and set 
on the upper side of the grooved rachis which j 
i and with 
ored spines 46 mm. long at the base, 
cled in the axils and ve 
