STANDLEY—TROPICAL AMERICAN PHANEROGAMS, 213 
with entire acute lobes, brownish-tomentose at first on the upper surface but 
soon glabrate, beneath densely covered with a close, grayish or yellowish 
tomentum; peduncle and rachis together 24 cm. long, slender, glabrate; heads 
3 or 4, 2.5 to 3 cm. in diameter, borne on stout stalks 1 to 2 em. long; achene 
5 to 5.5 mm. long, glabrous below, densely pilose above, about equaled by the 
basal haips, the persistent style 3 to 4 mm. long. 
Type in the U. 8. National Herbarium, no. 470790, collected at Zineantén, 
Chiapas, Mexico, May 16, 1904, by E. A. Goldman (no. 993). Immature 
specimens, apparently referable here, were obtained at Teopisca, Chiapas, by 
G. N, Collins and C. B. Doyle (no, 128). 
Most closely related to P. lindeniana Mart. & Gal., but easily distinguished 
by the stalked pistillate heads. 
Platanus oaxacana Standl., sp. nov. 
Young branches grayish or dark brown, glabrate; petioles stout, 1 to 3.5 em, 
long, tomentose; leaf blades 6.5 to 15 em, long, 7.5 to 18.5 em. wide, truncate 
or subcordate at the base, obscurely or not at all decurrent, usually shallowly 
trilobate, the lobes long-acuminate, irregularly dentate with coarse acuminate 
teeth, green and glabrate on the upper surface, covered beneath with a sparse 
close grayish tomentum; heads 3 or 4, sessile, 8 to 3.8 em. in diameter, the 
peduncle stout, 4 to 5 cm. long; achene 6 to 7 mm. long, tomentose at the apex 
at first but soon glabrate, the persistent style 3 to 4 mm. long. 
Type in the U. 8. National Herbarium, no. 888488, collected at San Miguel 
Alborrados, Oaxaca, Mexico, altitude 1,950 meters, July 2, 1894, by E. W. 
Nelson (no. 540). 
The present plant is evidently related to P. lindeniana Mart. & Gal.. of 
which it may be only a form, but in that species the leaves are narrower, 
rounded, and decurrent at the base, with a loose whitish tomentum, and the 
long, narrow lobes are commonly entire. 
Prunus prionophylla Standl., sp. nov. 
Plant glabrous throughout, the branches dark brown or blackish, roughened 
with numerous lenticels; petioles stout, about 1 cm. long; leaf blades lance- 
oblong or narrowly elliptic-oblong, 9 to 11 cm. long, 3 to 3.5 em wide, rounded 
or obtuse at the base, acute at the apex, the venation impressed, pale beneath, 
the costa very stout and salient, the lateral veins plane or prominulous, the 
margin coarsely serrate almost to the apex, the lower surface usually with 2 
glands at the base adjacent to the costa; racemes axillary, subsessile, solitary, 
naked, 4 to 5 cm. long, densely many-flowered, the pedicels very stout, 3 to 4 
mm, long; calyx tube 3 mm. long, glabrous within, soon deciduous, the lobes 
oblong-oval; petals rounded, about 3 mm. long and broad, glabrous, white; 
ovary ovoid, tapering to the style; stigma about 1 mm. broad. 
Type in the U. S. National Herbarium, no. 470171, collected along brooks 
on Ixtaccihuatl, Mexico, altitude 2,100 to 2,400 meters, in 1903, by C. A. 
Purpus (no. 249). 
A species of the subgenus Laurocerasus, but not closely related to any known 
from Mexico. The coarse teeth of the leaves suggest the very different 
Prunus ilicifolia (Nutt.) Walp., of California and Baja California. 
Caesalpinia acapulcensis Standl., sp. nov. ‘ 
Unarmed shrub or small tree; branches terete, brown, with large pale lenti- 
cels, puberulent when young and furnished with short-stipitate glands; petioles 
2.5 to 3 cm. long, sometimes with scattered stipitate glands; pinnae 2 or 3 
pairs; leaflets 1 or 2 pairs, opposite, short-petiolulate, obliquely ovate, oval- 
oblong, or oval, 2 to 4 em. long, 1.5 to 2.7 cm, wide, very oblique at the base, 
