50 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
MELIACEAE, 
A NEW TRICHILIA. 
Trichilia pringlei Rose, sp. nov. 
A shrub, 4 to 9 meters high; branches gray, at first a little pubescent; leaves 2 to 
3 dm. long; leaflets about 7 pairs, at first densely whitish-pubescent on both sides, 
in age much less pubescent, lanceolate, 2 to 7 em. long, acuminate, but with obtuse 
apex, strongly oblique at base, entire; flowers in numerous panicles, clustered at the 
top, much shorter than the leaves; calyx 5-lobed; sepals obtuse, the margins ciliate, 
otherwise glabrous; petals 5, oblong, 8 to 10 mm. long, obtuse, glabrous; stamens 9, 
united nearly to the middle, nearly glabrous; style glabrous, ovary densely pubes- 
cent, 3 or 4 celled; cells 2-ovuled, one ovule above the other; capsule globular, 15 
mm. in diameter, densely reddish-pubescent. 
Collected near Cuernavaca, Morelos, on lava beds by C. G. Pringle, July 24, 1896 
(no. 6394, type), and on the side of a barranca by J. N. Rose, May, 1899 (no. 4433). 
This species does not belong to any of DeCandolle’s sections, for it has the ovules 
of the mollis section and the petals of the rubra section, 
RHAMNACEAE. 
A NEW COLUBRINA. 
Colubrina megacarpa Rose, sp. nov. Puate NI, 
Low shrubs, 10 to 15 dm. high; young branches rusty-pubescent, becoming gla- 
brate; leaves attenuate, on the sterile branches much larger, orbicular to oblong, 4 to 
7 em. long, 2 to 6em. broad, rounded at base and apex, crenately toothed, somewhat 
pubescent above, densely lanate-pubescent beneath, 3 to 5 nerved at base; petioles 
very short (3 to 10 mm. long); flowers not seen, but evidently borne in small clus- 
ters on short peduncles; pedicels 5 mm, long; fruit pendent, very large for the genus, 
1 cm. in diameter, at first fleshy, but becoming dry, dehiscing as in the genus; seeds 
brown, flattened, 6 mm. long. 
Collected by CG, Pringle near Tehuacan, Puebla (no. 6761), and at the same 
locality by J. N. Rose, August 1 and 2, 1901 (no. 5852, type). 
EXPLANATION OF PLATE XI.—Figs. a and b, leafy and fruiting branches, natural size, 
NEW SPECIES OF RHAMNUS. 
The following new species of Rhamnus are presented only after the 
most careful study of the descriptions and specimens of the Mexican 
species of this genus. The National Herbarium contains nearly all 
the reported species, but the number of specimens of each Is limited 
to one or two sheets and therefore either flowers or fruit are often 
lacking. For this reason, in part, it is not practicable to publish a 
revision at this time. Another reason is that the generic position of 
several of the old species is in doubt, and therefore the types themselves 
should be restudied or fresh material should be collected frem the type 
locality. 
Rhamunus nelsoni Rose, sp. noy. 
Shrub 12 to 24 em. high; branches a reddish brown; leaves narrowly oblong, 5 to 
7 em. long, finely serrate, glabrous above, somewhat tomentose beneath; flowers not 
