186 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
fasciculate, 2.5 to 4 cm. long, glabrous, the bracts ovate-oblong, 4 to 5 mm, 
long; flowers glabrous, the calyx campanulate, shallowy lobate, glaucescent, the 
corolla 3.5 to 4 mm. long, the lobes ovate, obtuse; stamens very numerous, long- 
exserted ; fruit long-stipitate, 6.5 to 8.5 cm. long, 0.9 to 1.8 cm. wide, straight, flat, 
acute or attenuate at the base, rounded and rostrate at the apex, glabrous, 
glaucescent, the valves thin, reticulate-veined; seeds brown-olivaceous, 5 mm. 
long, 4 mm. wide, compressed, smooth, 
Type in the U. S. National Herbarium, no. 371953, collected on Cerro de San 
Felipe, Oaxaca, Mexico, altitude 2,000 meters, August 29, 1897, by C. Conzatti 
and V. Gonzalez (no. 564). 
The description of the fruit is based upon a specimen collected somewhere in 
Jalisco, in 1897, by J. N. Rose (no. 3008a). It is possible that this collection 
is not conspecific with the type. 
Acacia penicillata, like A. laevis, described above, is closely related to A. 
tequilana, and perhaps only an extreme variant of it. The leaflets are so much 
smaller and narrower in the present plant, however, that it seems probable 
that it is specifically different. 
Acacia conzattii Standl., sp. nov. 
Branches slender, dark gray or brownish, with many small pale lenticels, 
hirtellous when young, armed with numerous pairs of stipular spines, these 
stout, straight, 0.8 to 3.8 cm. long, connate at the base; petioles slender, 1.5 to 
2.5 cm. long, sparsely and minutely hirtellous or glabrate, with an excavate 
gland near the base; pinnae one pair, the leaflets 2 pairs (the lower leaflets 
alternate), oblong, oblong-obovate, or ovate, the terminal ones asymmetric, 
obtuse or rounded at the unequal base, rounded to acute at the apex, mucronu- 
late, chartaceous, bright green, with prominent or prominulous venation, 
minutely pilose beneath along the costa but elsewhere glabrous; flowers spicate, 
sessile, the spikes dense, 2 to 5 cm. long, the peduncle very short, pilose, sub- 
tended at the base by a tubular-campanulate involucel; bractlets filiform- 
spatulate, minutely pilose; calyx half as long as the corolla, puberulent on the 
upper part; stamens numerous, long-exserted. 
Type in the U. S. National Herbarium, no. 572217, collected at Estacién Al- 
moloyas, Oaxaca, Mexico, altitude 700 meters, March, 1907, by C. Conzatti (no. 
1756). 
Related to Acacia pringlei Rose, a species distinguished from the present 
plant by its short spines and large, proportionally broader leaflets. 
Acacia sororia Standl., sp. nov. 
Branches stout, terete, dark gray or blackish, with few scattered stout 
spines 2 mm. long, the young branches densely cinereo-puberulent; petioles 
stout, 6 to 15 mm. long, with a large excavate gland at the apex; rachis of 
the leaves densely pilose with minute whitish hairs, the pinnae 2 or 8 pairs; 
leaflets 1 or 2 pairs, sessile, obliquely oval, suborbicular, or flabellate-orbicular, 
0.9 to 2.5 em. long, 0.7 to 2 cm. wide, rounded and very unequal at the base, 
broadly rounded at the apex, thick-coriaceous, densely cinereo-puberulent, 
palmately nerved, the venation prominent, especially beneath; flowers spicate, 
sessile, the spikes 1.8 to 2 cm. long, the peduncles solitary, 1.5 to 2.5 cm. long, 
densely and minutely pilose; calyx densely and minutely pilose; fruit stipitate, 
4.5 to 8 cm. long, 1.5 to 2.5 em. wide, straight or slightly curved, densely 
cinereo-puberulent, the stipe stout, 5 to 10 mm. long, the valves thick and 
hard, abruptly decurrent into the stipe, rounded and rostrate at the apex, 
usually slightly constricted between the seeds, the edges thickened; seeds 
3 or 4, ovate-orbicular, strongly compressed, about 138 mm. long and 11 mm. 
wide, dark castaneous. 
