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Chinese Plant Names | Family List | Rosaceae | Rosa

Rosa helenae Rehd. et Wils.


Description from Flora of China

Rosa floribunda Baker.

Shrubs diffuse or scandent, with long repent branches to 9 m. Branches purple-brown, robust; branchlets of present year red-brown, glabrous; prickles scattered, yellowish, curved, to 4 mm, stout, flat, tapering gradually to broad base. Leaves including petiole 8–17 cm; stipules 1.5–2.5 cm, mostly adnate to petiole, apical free parts auriculate, margin glandular-pubescent, apex acuminate; rachis and petiole pubescent, with scattered small prickles; leaflets (5–)7–9, oblong-ovate or ovate-lanceolate, 2.5–3.5(–4.5) × 1–2.5 cm, abaxially pubescent, with prominent veins, adaxially glabrous, base rounded or broadly cuneate, margin appressed-serrate, apex acute or shortly acuminate. Flowers 2.5–3.1 cm in diam., in terminal corymbs 6–15 cm in diam., partly umbel-like; pedicel 1.5–2 cm, densely pubescent and glandular-pubescent; bracts caducous, lanceolate. Hypanthium ovoid, ellipsoid, or obovoid, pubescent and glandular-pubescent. Sepals 5, deciduous, ovate-lanceolate, abaxially villous and glandular-pubescent, adaxially densely villous, margin often lobed, apex acuminate. Petals 5, fragrant, white, obovate, base cuneate, apex emarginate. Styles connate into column, exserted, nearly equaling stamens, densely villous. Hip deep red, ovoid, ellipsoid, or obovoid, 1–1.5 × 0.8–1 cm, shiny; sepals reflexed after anthesis and deciduous. Fl. May–Jul, fr. Sep–Oct.

Three forms may be recognized: f. helenae, which has singly serrate, abaxially eglandular leaflets; f. duplicata T. C. Ku (Bull. Bot. Res., Harbin 10(1): 12. 1990), which has doubly serrate, abaxially eglandular leaflets; and f. glandulifera T. C. Ku (Bull. Bot. Res., Harbin 10(1): 12. 1990), which has singly serrate, abaxially glandular leaflets.

Wood margins, thickets, scrub, slopes, stream sides; 1000--3000 m. Gansu, Guizhou, Hubei, Shaanxi, Sichuan, Yunnan [Thailand, Vietnam].


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