STANDLEY—TROPICAL AMERICAN PHANEROGAMS. 187 
Type in the U. S. National-Herbarium, no. 453250, collected near Higuerillas, 
Querétaro, Mexico, August 28, 1905, by J. N. Rose, J. H. Painter, and J. 8S. 
Rose (no. 9761). Also collected at the same place, on the same date, by 
F, Altamirano (no, 1668). 
The only closely related Mexican acacia is A. reniformis Benth., described 
from the same general region, a species not represented in the National Her- 
parium. It is possible that A. sororia is only a form of A. reniformis, but 
Bentham’s excellent -description and illustration indicate several important 
differences. A. reniformis is described as “ undique glaberrima”; the flowers 
are pedicellate and glabrous; and the pinnae are only one or two pairs, each 
with a single pair of leaflets. The stipules, too, are large and reniform and 
persistent, while in the specimens of A. sororia, although some of the leaves 
are immature, the stipules have all fallen. 
Acacia rosei Standl., sp. nov. 
Branchlets brown, glabrous or sparsely puberulent, unarmed ; petioles 2 to 
4 em. long, without a large gland but with numerous minute ones, these 
scarcely elevated; rachis of the leaf (when present) 1.5 to 2.5 cm. long, the 
pinnae 1 or 2 pairs, the leaflets 2 or 8 pairs, oval, oval-elliptic, or ovate-oval, 
the terminal ones slightly asymmetric, 2.5 to 5 em, long, 1.4 to 2.5 cm. wide, 
rounded at the base, obtuse or rounded at the apex, chartaceous, with promi- 
nent or prominulous venation, green above, pale beneath, with a few short 
scattered hairs along the veins, elsewhere glabrous, the margin plane or sub- 
revolute, ciliolate; flowers white, pedicellate, capitate, the heads few, panicu- 
late, the penduncles shorter than the heads, puberulent; calyx puberulent ; 
corolla glabrous, 3 times as long as the calyx; stamens very numerous ; fruit 
slender-stipitate, straight, the valves very thin, 3 to 4.5 cm. long, 0.9 to 1.4 cm. 
wide, acute at the base, rounded and rostrate at the apex, brown, prominently 
reticulate-veined ; seeds olivaceous, 3.5 to 4 mm. long, very slightly compressed. 
Type in the U. S. National Herbarium, no. 636502, collected on Observatory 
Hill, Mazatlan, Sinaloa, Mexico, March 30, 1910, by J. N. Rose, P. C. Standley, 
and P. G. Russell (no. 18673). 
Because of the pedicellate flowers and the absence of petiolar glands it is 
evident that this plant belongs to the series Filicinae of Bentham, but it is not 
closely related to any of the described species of that group. It somewhat 
resembles A. crinita T. S. Brandeg., a species of the same region, notable for 
its hispid stems. 
Acacia vernicosa Standl., sp. nov. 
Shrub, 1 to 2 meters high, viscid throughout with minute glands, these not 
at all elevated, the branches reddish brown, glabrous or nearly so, armed with 
numerous stipular spines, these stout, gray or white, 0.5 to 1.6 cm. long; petioles 
8 to 7 mm. long, usually with a minute gland at the apex, the pinnae 1 or 2 
(very rarely 3) pairs; leaflets 7 to 9 pairs, oval or oval-oblong, 1.2 to 3 mm. 
long, 0.5 to 1.2 mm. wide, rounded at each end, very thick, extremely viscid, 
glabrous, plane, the venation obscure; inflorescence capitate, dense, the pe- 
duncles axillary, 1 to 2 cm. long, usually glabrous, the small involucel borne at 
or above the middle; flowers glabrous, yellow; fruit 4 to 7 cm. long, 2.5 to 4 
mm. wide, dehiscent, the valves thin, convex, brown, lustrous, more or less 
constricted between the seeds; seeds oblong, 4 to 6 mm. long, gray, spotted with 
black. 
Type in the U. S. National Herbarium, no. 573848, collected in the vicinity of 
Santa Rosalia, Chihuahua, Mexico, altitude about 1,200 meters, June, 1908, by 
Edward Palmer (no. 385). 
