17, 3 Merrill: Noteworthy Philippine Plants, XVI 259 



ROSACEAE 



ROSA Linnaeus 

 ROSA LUZONIENSIS sp. nov. § Synstylae. 



Frutex scandens, usque ad 4 m altus, glaber, ramis aculeatis, 

 aculeis 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 aculeis 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. J^SOO Mearns, July, 1907, Bur. 

 Sci. S336 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 multi flora 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 Ruhus 

 transmorrisonensis Hayata. 



