Rubus arcticus subsp. acaulis (Michx.) Focke

Rubus acaulis Michx. FL Bor. Am. 1: 298, 1803
Rubus pistillatus Smith, Exot. Bot. 2: 53. 1804. Manteia acaulis Raf. Sylva Tell. 161. 1838. Rubus arcticus T. & G. Fl. N. Am. 1: 452. 1840. Rubus arcticus grandiflorus Ledeb. Fl. Ross. 2: 70. 1844.
A herbaceous, unarmed, sub-dioecious perennial, with branched, scaly, creeping rootstock ; stem 3-12 cm. high, simple, erect, scarcely flexuous, more or less pubescent, scaly below, 2-4leaved and usually 1 -flowered; stipules obovate, elliptic, or lanceolate, 2-8 mm. long; petioles 2-6 cm. long; leaflets 3, thin, green on both sides, sparingly appressed-pubescent on both sides, 2-5 cm. long, unevenly serrate or those of the lower leaves crenate-serrate, mostly rounded or obtuse at the apex, only the upper ones sometimes acute, all more or less petioluled ; petiolule of the terminal one often 5-7 mm. long; lateral leaflets broadly obovate, sometimes 2-cleft, the terminal one rhombicor flabelliform-obovate; flowers usually solitary; peduncles 2-5 cm. long; sepals narrowly lanceolate, often attenuate, 8-10 mm. long, in anthesis reflexed; petals spatulate or oblanceolate, 10-13 mm. (rarely only 8-10 mm.) long, rose-colored, with distinct somewhat yellowish claws; stamens numerous; filaments dilated, clavate, incurved; pistils many; receptacle flat; drupelets coherent, 20-30; putamen smooth, 4 mm. long.
Type locality: Sphagnum bogs near Hudson Bay.
Distribution: Arctic and subarctic America, from Labrador, Island of St. Pierre, and the Gaspe Peninsula to northern Minnesota, Wyoming, British Columbia, and Alaska; also in eastern Siberia.