ROSE—MEXICAN AND CENTRAL AMERICAN PLANTS. 51 
seen; fruits 2 or 3 in the axils on short peduncles, 4 to 6 mm. long, obovate in out- 
line, 3-celled. 
Collected by FE. W. Nelson, between San Cristobal and Teopisca, Chiapas, Decem- 
ber 4, 1895 (no. 3450). 
Rhamunus obliqua Rose, sp. nov. 
A small tree; branches long and slender with black bark; voung branches, 
petioles, pedicels, stipules, and buds densely pubescent, usually with brownish 
spreading hairs; leaves lanceolate, 4 to 6 em, long, shortly acuminate, rounded or 
somewhat narrowed at base, often oblique, dark green above, paler beneath, glabrous 
on both sides except along the midvein, the margin bluntly toothed; flowers in axils, 
probably few together; fruits (immature) one or two, rarely three, glabrous, globular; 
pedicels 3 to 5 mm. long. 
On the Sacred Hill at Amacamaca, State of Mexico, collected by J. N. Rose, July 
16, 1901 (no. 5498). 
Somewhat resembling R. serrata, but with darker green leaves, different pubes- 
cence, stipules, serrations, ete. 
Rhamnus revoluta Rose, sp. nov. 
Young branches somewhat tomentose; leaves oblong, 5 to 7 cm. long, 2 to 3 em. 
broad, obtuse at apex, generally rounded at base, finely serrate, the margin some- 
what revolute, nearly glabrous above, at first almost tomentose, but in age the 
pubescence more scattered; umbels subsessile or distinctly peduncled, 6 to 8 flowered; 
pedicels + to 6 mm. long; calyx 38 mm. long, only slightly pubescent; petals small, 
broad, strongly retuse at apex; fruit not seen. 
Collected by Mr. C. G. Pringle in the Sierra Madre near Monterey, Mexico, May 
29, 1889 (no, 2539). 
Rhamnus pringlei Rose, sp. nov. 
A shrub? to 18 dm. high; young branches, foliage, peduncles (pedicels), ete., 
tomentose; leaves broadly oblong, 2 cm. long, obtuse or even retuse at apex, thin, 
rounded at base, serrate, on very short petioles; umbel sessile, few-flowered; pedi- 
cels 6 mm. long; calyx small, villous; petals broad, strongly emarginate. 
Collected by C. G. Pringle near Oaxaca, Mexico, 1894 (no, 4662). 
This species is nearest R. palmeri, but has much smaller, thinner, and less tomen- 
tose leaves, different petals, ete. 
Rhamuus discolor (Donnell-Smith) Rose. 
Rhamnus capreaefolia discolor Donnell-Smith, Bot. Gaz. 20: 200. 1893. 
This is a good species differing from FR. capreaefolia in its pubescence, larger and 
paler leaves, usually peduncled umbels, ete. 
Type locality ‘‘Coban,’’ Guatemala. 
VITACEAE. 
A NEW AMPELOPSIS. 
Ampelopsis mexicana Rose, sp. nov. 
A high-climbing vine; branches long and slender, more or less brownish, glabrous 
and somewhat glaucous; tendrils branched; leaves 2 or 8 ternate; leaflets ovate, 3 to 
5 em. long, rounded or somewhat cuneate at base, shortly acuminate, serrate, some- 
what pubescent; peduncles slender; secondary branches spreading, often nearly at 
right angles; calyx very small; petals 5 (?), spreading, less than 2 mm. long; style 
slender, short; fruit white, more or less inflated, becoming dry in age, 2 or 3 seeded; 
seed broader than long. 
Collected by J. N. Rose near Acaponeta, Tepic, June 23, 1897 (no. 1455, type), 
and near Rosario, Sinaloa, July 8 (no. 1579). 
