Rosa derongensis T. C. Ku

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

Shrubs small. Branchlets purple-brown or red-brown, terete, curved, glabrous; prickles often yellowish or gray-brown, straight or slightly curved, robust, inflated at base. Leaves including petiole 2.5–3.2 cm; stipules mostly adnate into petiole, free parts shortly triangular or ovate, glabrous, margin glandular serrate, rachis and petioles glabrous, sparsely glandular-pubescent and with small, curved prickles; leaflets 5, rarely 7, yellow-green abaxially, deep green adaxially, obovate, 9–15 × 6–10 mm, both surfaces glabrous, base cuneate or subrounded, margin sharply serrate, apex rounded. Flowers 2 or 3 and fasciculate, rarely solitary; bracts caducous, unknown. Hypanthium ovoid. Sepals 5, lanceolate or ovate-lanceolate, 7–9 mm, abaxially pubescent and glandular-pubescent, adaxially tomentose-pubescent, margin with 1 or 2 pairs of lobes, apex acuminate, after anthesis reflexed. Petals unknown. Style connate in column, exserted, slightly shorter than stamen, glabrous. Hip red-brown, subglobose or obovoid, ca. 8 mm in diam., sparsely glandular. Hip unknown.

W Sichuan (Dêrong Xian).

About 2100 m.

Rosa derongensis là loài thực vật có hoa trong họ Hoa hồng. Loài này được T.C. Ku miêu tả khoa học đầu tiên năm 1990.