White Stem Raspberry

Rubus leucodermis Dougl.; (Hook. Fl. Bor.-Am. 1: 178, as
synonym. 1832) T. & G. Fl. N. Am. 1: 454. 1840.
Rubus occidentalis Hook. Fl. Bor. Am. 1: 178. 1832.
Rubus occidentalis leucodermis Focke, Abh. Nat. Ver. Bremen 4: 147. 1874.
Melanobatus leucodermis Greene, Leaflets 1: 243. 1906.
Stems biennial, erect, 1-2 m. high, yellowish and glaucous, glabrous, armed with stout, flat, recurved prickles; leaves of the turions usually pedately 5-foliolate; stipules setaceous; petioles, petiolules, and midveins prickly; petioles 4-8 cm. long, slightly pubescent when young; terminal leaflet broadly ovate, 6-10 cm. long, acute, rarely short-acuminate, often somewhat lobed, coarsely double-serrate with triangular teeth, rounded or subcordate at the base; petiolule 3-6 cm. long; lateral leaflets similar but narrower and merely rounded at the base, their petiolules 2-3 cm. long; lower leaflets usually subsessile; floral branches usually with yellowish bark, their leaves 3-foliolate, the leaflets smaller, 3-6 cm. long, the terminal one with a petiolule 1-2 cm. long, the lateral ones sessile or subsessile; corymbs usually few-flowered, terminal, or with a few branches in the upper leaf-axils; pedicels tomentose, prickly, but not glandular; hypanthium and calyx tomentose, not glandular; sepals lanceolate, long-acuminate, 7-8 mm. long, in fruit merely spreading; petals white, oblong or elliptic, somewhat clawed, shorter than the sepals; fruit hemispheric, dark reddish-purple or nearly black, with a bloom; drupelets rather numerous, tomentose.
Type locality: Oregon.
Distribution: British Columbia to Montana, Utah, and central California.