Rosa acicularis Lindl.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Colonial; stems to 1(–2) m, usually densely beset with straight, slender, unequal prickles, even on the flowering lateral branches; stipules pubescent, glandular on the margin, when young densely covered with short-stipitate glands, as also the bracts; rachis usually pubescent and glandular; lfls 5 or 7(9), elliptic to ovate or obovate, 1.5–4.5(–8) cm, usually doubly serrate, often glandular; fls usually solitary on lateral branches from stems of the previous year; hypanthium and pedicel glabrous, or the pedicel seldom stipitate-glandular; pet pink or deep rose, 1.5–3 cm; sep persistent, becoming erect and connivent; hips 1–2 cm thick, dark blue or purplish; 2n=42. Upland woods, hills, and rocky banks; N.B. and Que. to Alas. and Eurasia, s. to W.Va., Mich., nw. Ill., Io., and N.M. The Amer. plants, as here described, are var. bourgeauiana Crép., or subsp. sayi (Schwein.) W. H. Lewis. (R. bourgeauiana; R. sayi)