212 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
that the name Urostigma involutum probably referred to the same plant. 
Through the kindness of Dr. C. H. Ostenfeld, a leaf of the type of U. involutum, 
in the herbarium at Copenhagen, has now been examined, and this shows con- 
clusively that the two specific names are synonymous. The correct name for 
the plant, then, is icus involuta (Liebm.) Miquel. 
Struthanthus densiflorus (Benth.) Stand}, 
Loranthus densiflorus Benth. Vl. Hartw. G2. 1840. 
Struthanthus diversifolius (Benth.) Standl. 
Loranthus diversifolius Benth, Pl. Hartw. 63. 1840. 
Struthanthus grahami (Benth.) Standl. 
Loranthus grahami Benth. Pl, Hartw. 62. 1840. 
Struthanthus haenkeanus (Pres!) Standl. 
Spirostylis haenkeanus Pres]; Schult. Syst. Veg. 7: 168, 1829. 
Loranthus spirostylis DC. Prodr. 4: 315, 1830, 
Struthanthus hartwegi (Benth.) Stand}. 
Loranthus hartwegi Benth. Pl. Hartw. G2. 1840. 
Struthanthus inconspicuus (Benth.) Standl, 
Loranthus ineconspicuus Benth. Bot. Voy. Sulph. 102. 1844. 
Struthanthus inornus (Robins. & Greenm.) Standl,. 
Loranthus inornus Robins. & Green, Amer, Journ. Sci. 50: 1638, 1895, 
Phrygilanthus sonorae (8. Wats.) Stand). 
Loranthus sonorae S. Wats, Proc, Amer, Acad, 24: 73. 1889, 
Ximenia pubescens Standl., sp. nov. 
Branches slender, grayish, armed with stout straight spines 5 to 8 mm. long, 
the branchlets densely pilose with short fulvous hairs, the pubescence persist- 
ent in age; petioles stout, 3 to 5 mm. long, densely puberulent; leaf blades 
orbicular or broadly oval, 2.2 to 4 em, long, 2 to 3.5 em. wide, rounded at the 
base, rounded at thé apex and often obscurely emarginate, coriaceous, ‘densely 
puberulent; pedicels and calyx densely puberulent; calvx lobes minute, broadly 
ovate, obtuse or acutish; petals 4.5 to 5 mm. long, acute or acutish, puberulent 
outside, densely barbate within from the middle to the base; anthers about 
1.5 mm. long. , 
Type in the U. S. National Herbarium, no. 888478, collected between Mixtepec 
and Colotepee, Oaxaca, Mexico, altitude 75 to 240 meters, March 6, 1895, by 
E. W. Nelson (no. 2448), 
Two other species of Ximenia are known from Mexico, XY. americana L. and 
X. parviflora Benth., both of which are glabrous plants. XY. pubescens differs 
from both in its broad leaves, but the small corolla indicates a relationship 
with the latter species. 
A specimen collected in the foothills of the Sierra Madre, Sinaloa, by J. N. 
Rose, July 18 to 20, 1897, also has pubescent leaves, but the blades are oblong 
or elliptic-oblong, and very small. It is accompanied by fruit, but without 
flowers its position is doubtful. Probably it represents an undescribed species, 
but it may be only a variant of XY. pubescens. 
Platanus chiapensis Standl., sp. nov. 
Tree, 15 meters high, the branchlets grayish brown, with a feltlike brownish 
tomentum at first but soon glabrate; petioles stout, 2 to 6 em. long, tomentose 
at first; leaf blades very broadly ovate or ovate-orbicular, 8.5 to 23.5 em. long, 
5.5 to 19 cm. wide, rounded or subtruncate at the base and usually abruptly 
short-decurrent, very acute to long-acuminate at the apex, with a few coarse 
mucronate teeth near or above the middle or sometimes shallowly trilobate, 
