单花合柱蔷薇 dan hua huo zhu qiang wei

Rosa uniflora T. T. Yü & T. C. Ku, Bull. Bot. Res., Harbin 1(4): 12. 1981, not Galushko (1959).

Shrubs small. Branchlets brown or purple-brown, terete, curved, slender, striate, subglabrous; prickles scattered or in pairs, short, flat. Leaves including petiole 2.5–3.5 cm; stipules pectinate, mostly adnate to petiole, both surfaces and margin sparsely pubescent, densely glandular-pubescent; rachis and petiole densely pubescent and glandular-pubescent; leaflets 5–7, obovate or broadly elliptic, 7–10 × 5–7 mm, abaxially pubescent, with prominent midvein, adaxially sparsely pubescent, base broadly cuneate or subrounded, margin simply serrate or nearly doubly serrate, apex acute or obtuse. Flower solitary, axillary, 2–2.5 cm in diam.; pedicel less than 1 cm, sparsely pubescent and glandular-pubescent; bracts 2 or 3, at base of pedicel, ovate-lanceolate, abaxially and margin densely glandular-pubescent. Hypanthium oblong, abaxially densely glandular-pubescent. Sepals 5, lanceolate, ca. 5 mm, abaxially densely glandular-pubescent, adaxially densely pubescent, margin entire or rarely lobed, apex acuminate. Petals 5, white, oblong-obovate, base cuneate, apex emarginate. Styles connate into column, slightly shorter than stamens, glabrous. Hip unknown.

Sunny sea shores. NE Zhejiang (Daishan Xian).

One of us (Robertson) has seen no specimens of this species.