55. Rosa tibetica T. T. Yu & T. C. Ku, Acta Phytotax. Sin. 18: 500. 1980.
西藏蔷薇 xi zang qiang wei
Shrubs small. Branchlets slightly curved, glabrous; prickles scattered or in pairs, yellowish, straight, often intermixed with bristles. Leaves including petiole ca. 4 cm; stipules mostly adnate to petiole, free parts ovate, margin glandular-pubescent, apex acute; rachis and petiole sparsely glandular-pubescent and shortly prickly; leaflets 5–7, oblong, 1–1.3 × 0.5–0.8 cm, abaxially glandular-pubescent, with prominent midvein and lateral veins, adaxially glabrous, base subrounded or broadly cuneate, margin doubly serrate, teeth often glandular apically, apex rounded-obtuse. Flower solitary, 3.5–4 cm in diam.; pedicel ca. 2 cm, glabrous; bracts ovate, ca. 1.5 cm, abaxially and margin glandular-pubescent, 3-lobed at apex. Hypanthium ovoid, glabrous. Sepals 5, ovate-lanceolate, abaxially subglabrous, adaxially densely pubescent, margin entire or inconspicuously serrate near apex, apex caudate. Petals 5, white, slightly broadly obovate, base cuneate, apex rounded-obtuse. Styles free, slightly exserted, shorter than stamens, densely white villous. Hip red-brown, ovoid or globose, 1–1.2 cm in diam., glabrous and smooth, with persistent, erect sepals. Fl. Jul–Aug, fr. Aug–Oct.
Coniferous forests, secondary Populus-Betula forests; 3800--4000 m. S Xizang.
One of us (Robertson) has seen no specimens of this species.