Rosa polyanthema

Rosa polyanthema Lunell, Am. Midi. Nat. 3 : 138. 1913
Stem erect, 5-15 dm. high, covered with numerous slender prickles or bristles, otherwise glabrous, the branches from the upper axils usually soon overtopping the inflorescence; stipules adnate to the petioles, very narrow, entire, densely pubescent beneath, glandular on the margins, the free portion lanceolate, short-villous and more or less glandular, often glandularbristly; leaflets 7-11, mostly 9, oval or obovate, cuneate at the base, obtuse or acutish at the apex, 2.5-5 cm. long, serrate, glabrate or nearly so above, short-pubescent beneath; flowers corymbose; pedicels 2-4 cm. long; hypanthium globose, glabrous, in fruit 15-20 mm. broad; sepals lanceolate, caudate-attenuate, usually entire, about 1.5 cm. long, tomentose within, glandular and pubescent without, after anthesis ascending, and persistent; styles distinct, persistent, not exserted; achenes inserted in the bottom and on the lower part of the sides of the hypanthium.
Type locality : Banks of the Missouri, not far from Bismarck, Burleigh County, North Dakota. Distribution: Type locality and vicinity.