Rubus hayatanus Koidzumi.

Subshrubs to 50 cm tall. Branchlets brownish to reddish brown, slender, pilose, glabrescent, with sparse, sharp prickles, with dense, purplish red stalked glands 2–5 mm. Leaves imparipinnate, 3–7-foliolate; petiole 2–3 cm, petiolule of terminal leaflet 5–10 mm, lateral leaflets subsessile, petiolule and rachis glabrous or sparsely pilose, with purplish red stalked glands and sparse prickles; stipules lanceolate or linear, 6–9 mm, margin with glandular hairs, sparsely pilose; blade of leaflets ovate-oblong or ovate-lanceolate, terminal leaflet 5–6 × 0.8–1.5 cm, lateral leaflets 1.5–3 × 0.6–1 cm, abaxially subglabrous, pilose, with stalked glands and with minute prickles along veins, adaxially sparsely pilose, base rounded to truncate, lateral leaflets oblique basally, margin incised-doubly serrate, apex acute to acuminate. Inflorescences terminal, corymbose, 3–5 cm, 1-flowered, rarely 2–5-flowered; rachis and pedicels subglabrous, with purplish red stalked glands and sparse, small prickles; bracts linear, 5–7 mm, subglabrous, margin with sparse, stalked glands. Pedicel 2–4 cm. Flowers 2–3 cm in diam. Calyx purplish red, subglabrous, with dense stalked glands and bristles abaxially; sepals narrowly triangular or triangular-lanceolate, 1.1–1.5 cm × 4–6 mm, inner sepals with tomentose margin, apex long caudate. Petals ovate, 1–1.4 cm × 7–9 mm, glabrous, base shortly clawed, apex obtuse. Stamens shorter than petals; filaments linear, somewhat broader basally. Pistils numerous, slightly shorter than stamens; style and ovary often glabrous. Aggregate fruit red, subglobose, 0.9–1.1 cm in diam., glabrous. Fl. Apr, fr. May–Jun. 2n = 14*.

Roadsides, grasslands. Medium elevations. Medium elevations. C and N Taiwan.