Vasilis Teodoridis:
Rubus
74. Rubus impressinervus F. P. Metcalf; Lingnan. Sci. J. 11: 12. 1932.
????? xian mai xuan gou zi
Herbs 0.5–1 m tall. Stems brown or reddish brown; cylindric; glabrous; with sparse; small prickles. Leaves simple; stipules linear; 8–10 mm; glabrous; margin entire; blade lanceolate or oblong-lanceolate; 10–22 x 2–5 cm; veins 9–12 pairs; raised abaxially; impressed adaxially; both surfaces glabrous; adaxially with sparse; small prickles along midvein; base rounded; margin sparsely sharply serrate; apex acuminate to caudate. Inflorescences terminal or axillary; 1-flowered. Pedicel 1.5–2.5 cm; glabrous; unarmed. Flowers to 1.5 cm in diam. Calyx abaxially glabrous; sepals erect after anthesis; ovate or lanceolate; 1–1.3 cm x 6–9 mm; apex abruptly pointed; inner sepals with yellowish gray tomentose margin. Petals white; 1.1–1.4 cm x 6–10 mm. Stamens many; shorter than petals; filaments broadened and flattened. Pistils nearly as long as stamens; ovary slightly soft hairy; torus basally with ca. 5 mm stalk; styles glabrous. Aggregate fruit brownish red; subglobose; ca. 2 cm in diam.; glabrous; pyrenes 1–2 mm; deeply foveolate. Fl. Jun–Jul; fr. Aug–Sep.
Montane valleys; dense forests; grasslands; wet waste places; 1300--1500 m. Fujian; Guangdong; Hunan; Jiangxi; Zhejiang.