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FOC | Family List | FOC Vol. 9 | Rosaceae | Rosa

35. Rosa laxa Retzius in Hoffmann, Phytogr. Bl. 39. 1803.

疏花蔷薇 shu hua qiang wei

Shrubs 1–2 m tall. Branchlets terete, straight or slightly curved, glabrous; prickles in pairs below leaves or scattered, yellowish, strongly hooked, to 1.5 cm, flat, gradually tapering to broad base, often densely intermixed with small prickles and bristles. Leaves including petiole 4.5–10 cm; stipules mostly adnate to petiole, free parts ovate, glabrous, auriculate, margin glandular serrate, apex acute; rachis and petiole sparsely prickly, glandular-pubescent, puberulous; leaflets 7–9, elliptic, oblong, or ovate, rarely obovate, ca. 1.5 × 0.8–2 cm, glabrous or pubescent, with prominent midvein and lateral veins, base subrounded or broadly cuneate, margin simply serrate, rarely doubly serrate, apex acute or rounded-obtuse. Flowers often 3–6 in corymb, sometimes solitary, ca. 3 cm in diam.; pedicel 1–1.8(–3) cm, glandular; bracts ovate, pubescent, glandular hispid, apex acuminate. Hypanthium oblong or ovoid, glabrous, rarely glandular hispid. Sepals 5, ovate-lanceolate, leaflike, abaxially sparsely pubescent and glandular hispid, adaxially densely pubescent, margin entire. Petals 5, white or pink, obovate, apex erose. Styles free, much shorter than stamens, densely villous. Hip red, oblong or ovoid, 1–1.8 cm in diam, glabrous, often shiny, apex with a short neck and persistent, erect sepals. Fl. Jun–Aug, fr. Aug–Sep. 2n = 14*.

Populus forests, scrub, valleys, damp grassy places, river and stream sides; 500--1500 m. Xinjiang [Mongolia, Russia (C Siberia); C Asia].

1 Leaflets glabrous on both surfaces or abaxially pubescent.   35a var. laxa
+ Leaflets densely pubescent on both surfaces.   35b var. mollis

Lower Taxa


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