17,3 Merrill: Noteworthy Philippine Plants, XVI 259 
ROSACEAE 
ROSA Linnaeus 
ROSA LUZON iENSiS sp. nov. § Synstylae. 
Frutex scandens, usque ad 4 m altus, glaber, ramis aculeatis, 
acuieis sparsis, curvatis, tenuibus, usque ad 6 mm longis; foliis 
3 ad 5 cm longis, 5- vel 7-foliatis, foliolis parvis, elliptico-ovatis, 
leviter acuminatis, 5 ad 15 mm longis, inermis vel subtus ad 
costa acuieis paucis armatis ; stipulis adnatis, margine pectinatis 
atque glandulis capitatis paucis instructis; floribus plerumque 
solitariis, calycis tubo glabro, lobis oblongo-lanceolatis, usque 
ad 10 mm longis, intus pilosis, extus glabris, margine parce 
capitato-gandulosis, atque laciniis tenuibus 2 vel 3 utrinque 
instructis; stylis circiter 15, glabris, connatis, 3 ad 5 mm longis. 
A scandent shrub, attaining a length of 4 m, glabrous except 
the inner surface of the sepals. Branches armed with slender, 
somewhat curved spines 4 to 6 mm in length. Leaves pinnate, 
5- or 7-foliolate, 3 to 5 cm long, glabrous, the leaflets small, 
elliptic-ovate, acute or acuminate, or the lower ones sometimes 
obtuse, sharply serrate, 5 to 15 mm long, the midrib beneath 
unarmed or with a few short spines ; stipules adnate, pectinate, 
the outer margins also somewhat capitate-glandular. Flowers 
white, mostly solitary, about 3 cm in diameter, their pedicels 
unarmed, not at all glandular, usually about 1 cm long. Calyx- 
tube glabrous, oblong-obovoid, about 6 mm long; lobes oblong- 
lanceolate, about 10 mm long, externally glabrous, inside 
pubescent, the margins sparingly capitate-glandular and with 
two or three, slender, 1.5 to 2 mm long laciniae on each side. 
Petals broadly obovate, about 17 mm long, retuse. Stamens 
indefinite, their filaments glabrous, up to 5 mm long. Styles 
about 15, glabrous, more or less united, 3 to 5 mm long. 
Luzon, Benguet Subprovince, Pauai, Bur. Sci. 31876 Santos 
(type), May 29, 1918, Bur. Sci. A300 Mearns, July, 1907, Bur. 
Sci. 8336 McGregor, June, 1909, on slopes in thickets near the 
mossy forest, altitude about 2,300 meters, with the local name 
pauican. 
This form has been confused with Rosa multiflora Thunb., 
from which, among other characters, it is distinguished by its 
much smaller leaves and leaflets; in being entirely glabrous, 
except for the sepals; in the absence of capitate glands on the 
branchlets and vegetative parts; and in its usually solitary 
flowers. It is apparently closely allied to the Formosan Rubus 
transmorrisonensis Hayata. 
