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

2. Rubus arcticus Linnaeus, Sp. Pl. 1: 494. 1753.

Arctic raspberry

Herbs, 0.5–3 dm, unarmed. Stems erect, ˂thin, weak, ± woody basally˃, glabrous or sparsely hairy, eglandular, not pruinose. Leaves deciduous, simple and usually 3-lobed or ternate; stipules ovate to lanceolate, 4–8 mm; blade margins dentate, serrate, or doubly serrate, abaxial surfaces sparsely to moderately pubescent, eglandular. Inflorescences axillary, 1–3-flowered. Pedicels glabrous or sparsely to moderately pubescent, eglandular or stipitate-glandular. Flowers bisexual; petals pink to rose or magenta, obovate to oblanceolate, 8–25 mm; outer filaments dilated basally, inner filiform; ovaries glabrous or sparsely hairy, ˂styles filiform˃. Fruits reddish to dark purple, globose, to 1 cm diam., rarely larger; drupelets (10–)15–30, weakly coherent, separating with torus attached.

Subspecies 3 (3 in the flora): North America, Eurasia.

The type specimen of Rubus alaskensis L. H. Bailey has long glandular hairs on the stems and has unusually large leaflets. It may represent a hybrid between R. arcticus and R. idaeus subsp. strigosus or some other species of Rubus.

1 Leaves simple, usually 3-lobed.   2c Rubus arcticus subsp. stellatus
+ Leaves usually ternate   (2)
2 (1) Central leaflets ovate to rhombic, bases rounded to attenuate, not cuneate, apices usually acute; flowers 1–3; petals obovate, apex entire or slightly emarginate.   2a Rubus arcticus subsp. arcticus
+ Central leaflets ovate to obovate, bases cuneate, apices usually rounded; flowers solitary; petals oblanceolate to obovate, apex slightly to strongly emarginate.   2b Rubus arcticus subsp. acaulis

Lower Taxa


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