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

77. Rubus pentagonus Wallich ex Focke, Biblioth. Bot. 17(Heft 72): 145. 1911.

掌叶悬钩子 zhang ye xuan gou zi

Shrubs scrambling, 1.5–3 m tall. Branchlets climbing, brownish to dark brown, slightly pubescent when young, later glabrous, with sparse prickles, often with stalked glands. Leaves palmately 3- or 5-foliolate; petiole 2–4 cm, sparsely pubescent, with stalked glands and minute prickles, rarely without stalked glands, leaflets sessile; stipules linear-lanceolate, 7–10 mm, puberulous, margin with shortly stalked glands, margin entire or deeply 2-laciniate; blade of leaflets rhombic-lanceolate, 3–8(–11) × 1.5–4 cm, abaxially sparsely pubescent, adaxially pilose along veins, base cuneate, margin incised coarse-doubly serrate, apex acuminate to caudate. Inflorescences terminal, corymbose, 2–3 cm, 2- or 3-flowered or with flowers solitary in leaf axils; bracts linear-lanceolate, 6–9 mm, often with stalked glands, margin entire or 2- or 3-laciniate. Pedicel 1.5–2.5 cm, glabrous, with sparse, gland-tipped hairs and small prickles. Flowers to 2 cm in diam. Calyx glabrous, abaxially glandular pubescent, with minute prickles; sepals erect, spreading, lanceolate or ovate-lanceolate, 0.8–1.2(–3) cm × 5–8 mm, margin entire or 3-laciniate, inner sepals with tomentose margin, apex acuminate or caudate. Petals white, elliptic or oblong, much shorter than sepals, base shortly clawed. Stamens many; filaments broad. Pistils 10–15, slightly shorter than stamens; style and ovary glabrous. Aggregate fruit red or orange-red, subglobose, to 2 cm in diam., glabrous, enclosed in calyx; pyrenes reniform, to 4 mm, rugose. Fl. Apr–May, fr. Jun–Jul.

Forests, forest margins on slopes, thickets, valleys, roadsides; 1300--3600 m. Guizhou, Sichuan, Xizang, Yunnan [Bhutan, NW India, N Myanmar, Nepal, Sikkim, Vietnam].

1 Plants with stalked glands and minute or needle-like prickles.   77a var. pentagonus
+ Plants usually without stalked glands, unarmed, rarely with few stalked glands or needle-like prickles.   (2)
2 (1) Flowers more than 1.5 cm in diam.; sepals 2–3 cm, apically long caudate; leaves palmately 3-foliolate.   77d var. longisepalus
+ Flowers less than 1.5 cm in diam.; sepals not more than 2 cm, apically acuminate; leaves 3- or 5-foliolate.   (3)
3 (2) Leaves palmately 3-foliolate.   77b var. modestus
+ Leaves palmately 5-foliolate.   77c var. eglandulosus

Lower Taxa


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