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

16. Rubus lasiococcus A. Gray, Proc. Amer. Acad. Arts. 17: 201. 1882.

Roughfruit berry

Herbs, 1–1.5 dm, unarmed. Stems creeping, ˂flowering branches erect˃, sparsely hairy, eglandular or sparsely to moderately short-stipitate-glandular, not pruinose. Leaves deciduous, simple or ternate; stipules broadly elliptic to ovate, 5–10 mm; leaflets 3(–5), blade reniform or orbiculate, terminal lobe or leaflets broadly obovate to obovate-cuneate, 1.5–4(–6) × 1.5–4(–6) cm, base cordate, 3(–5)-lobed, margins coarsely doubly dentate, apex rounded to acute, abaxial surfaces sparsely hairy on veins, eglandular. Inflorescences 1–2-flowered. Pedicels sparsely to moderately hairy, short-stipitate-glandular. Flowers bisexual; petals white, broadly elliptic to obovate to orbiculate, (5–)8–10(–12) mm; filaments filiform; ovaries densely hairy, ˂styles filiform, glabrous˃. Fruits red, hemispheric, 1 cm; drupelets 5–15, weakly coherent, falling separately or as loose units free from torus. 2n = 14.

Flowering May–Aug. Moist to dry, semiopen forests, wet meadows, roadsides, dry sand; 800–2000 m; B.C.; Calif., Oreg., Wash.

Rubus lasiococcus is recognized by its creeping, unarmed stems, simple 3-lobed to 3-foliate leaves, small flowers, white petals, and densely hairy ovaries.


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