This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Rubus arcticus L. Sp. Pl. 494. 1753.
R. acaulis Michx. Fl. Bor. Am, 1: 298. 1803.
Stems erect, simple or branched from the base, herbaceous, 3'-10' high, unarmed, finely pubescent, sometimes leafless below. Stipules oval or ovate, obtuse, 2"-4" long; leaves slender-petioled, 3-foliolate (rarely 5-foliolate); leaflets sessile or short-stalked, rhombic-ovate or obovate, coarsely and unequally serrate or slightly lobed, 9"-18" long; flowers solitary, or occasionally 2, terminal, slender-peduncled, pink, or rarely white, 6"-12" broad, sometimes dioecious; sepals acute, equalling or shorter than the obovate, entire or emarginate clawed petals; fruit light red, of several or numerous persistent or tardily deciduous drupelets, edible, fragrant.
In peat-bogs and damp woods, Quebec to Manitoba and British Columbia, and throughout arctic America. Also in northern Europe and Asia. Strawberry-leaved bramble. The petals of the American plant are mostly longer-clawed than those of the European. Summer.
Rubus saxatilis var. canadensis Michx. Fl. Bor. Am. 1:
Stem trailing or ascending, unarmed, annual, herbaceous, or slightly woody and sometimes branched below, 6'-18' long, somewhat pubescent. Stipules oval, entire or few-toothed, 3"-5" long; leaves peti-oled, pedately or pinnately 3-foliolate, rarely 5-foliolate; leaflets rhombic-ovate, glabrous or nearly so, acute, the lateral ones mostly rounded, the terminal ones cuneate at the base, all sharply and often doubly serrate; peduncles slender, 1-3-flowered, glandular-pubescent; flowers 4"-6" broad; petals 5-7, white, spatulate-oblong, erect, rather longer than the acuminate reflexed sepals; fruit red-purple, about 6" long.
In swamps, Newfoundland to Alaska, south to New Jersey, Iowa and Nebraska. Intermediate between blackberries and raspberries. May-July. Running raspberry. Mulberry. Plum-bog-. swamp- or pigeon-berry. Dewberry. Fruit ripe July-Aug.
Rubus parvifolius Walt. Fl. Car. 149. 1788. Not L.
Shrubby, erect or nearly so, 1°-3° high, much branched, armed with stout straight or recurved prickles, the young shoots and lower surfaces of the leaves densely whitish-pubescent. Stipules linear; leaves petioled, 3-5-foliolate; leaflets thick, rugose above, l'-2' long, obovate or rarely oval, obtuse, dentate, especially above the middle, the terminal one cuneate; peduncles mainly terminal, 2-5-flowered; flowers white or pinkish, nearly 1' broad; petals exceeding the sepals; fruit brownish-black, often 1' long, delicious.