Rosa treleasei

Rosa treleasei Rydberg, sp. nov
Stems slender, terete, reddish, 5-10 dm. high, armed with slender, terete, straight, darkbrown infrastipular prickles, which are 5-10 mm. long; young stems more or less bristly; stipules adnate, narrow, about 1 cm. long, glabrous, entire, the free portion lanceolate, ascending; petioles and rachis glabrous, sparingly armed with bristles or weak prickles; leaflets 5, subcoriaceous, lanceolate or lance-elliptic, acute, 2-4 cm. long, sharply serrate, acute at both ends, glabrous on both sides or sparingly pubescent on the veins beneath; flowers solitary or in pairs; pedicels 2-3 cm. long, sparingly glandular-hispid; hypanthium globose, sparingly glandular-hispid, in fruit bright red, about 1 cm. thick; sepals lanceolate, caudate-attenuate, soon deciduous; achenes inserted in the bottom of the hypanthium.
Type collected at Alden Bridge, Louisiana, June 30, 1898, Trelease (herb. Mo. Bot. Gard.).