Prickly Rose

Rosa bourgeauiana Crepin (Bull. Soc. Bot. Belg. 14: 9, hyponym. 1875); Rydb. Fl. Rocky Mts. 442. 1917.
Rosa majalis Borrer; Hook. Fl. Bor. Am. 1: 200. 1832. Not R. majalis Herrm. 1762. Rosa Sayi S. Wats. Proc. Am. Acad. 20: 340. 1885. Not R. Sayi Schw. 1824. Rosa acicularis Bourgeauiana Crepin. Bull. Soc. Bot. Belg. 15: 30. 1876. Rosa acicularis Sayi Rehder; L. H. Bailey, Cycl. Am. Hort. 1555. 1902.
Stem usually low, 3 or 10 dm. high, densely covered with straight bristles or weak prickles, but without infrastipular prickles; stipules adnate, usually dilated, 15-20 mm. long, slightly, if at all, pubescent, usually glandular-granuliferous beneath, glandular-dentate or glandular-ciliate, the free portion lanceolate or ovate; petioles and rachis somewhat pubescent and glandular; leaflets usually 5 or 7, broadly elliptic, 1.5-5 cm. long, usually rounded or obtuse at both ends, nearly sessile, more or less double-serrate with glandular teeth, thin, glabrous or nearly so above, paler, slightly pubescent, and glandulargranuliferous beneath; flowers usually solitary, rarely 2 or 3; pedicels 1-3 cm. long, glabrous; hypanthium subglobose or rounded-elliptic, glabrous, in fruit 12-15 mm. broad, with very short neck; sepals lanceolate, caudate-acuminate, about 2 cm. long, tomentose within and on the margin, slightly if at all glandular, after anthesis erect, connivent, and persistent; petals broadly obcordate, 2-2.5 cm. long, rose-colored; styles distinct, persistent, not exserted; achenes inserted in the bottom and on the sides of the hypanthium.
Type locality: Basin of Saskatchewan.
Distribution: Ontario to Colorado, Montana, and Mackenzie.

Rosa collaris Rydb. Fl. Rocky Mts. 441. 1917
Stem bristly but not copiously so, yellowish green, about 1 m. high; branches also some what bristly or unarmed; stipules mostly dilated, adnate, glandular-dentate, 1-2 cm. long, slightly puberulent, the free portion ovate or lanceolate, acute; petiole and rachis somewhat puberulent and glandular; leaflets mostly 5, oval, coarsely serrate, 1-3 cm. long, glabrous above, finely puberulent beneath; flowers solitary or 2-4 together; pedicels 1-2 cm. long, glabrous; hypanthium small, ellipsoid, contracted into a rather long neck, glabrous; sepals 8-10 cm. long, lanceolate, attenuate with rather short tips, tomentose along the margin, glabrate on the back, in fruit erect and persistent; achenes rather few, inserted both in the bottom and on the sides of the hypanthium.
Type locality: Pinehurst, Idaho. Distribution: Idaho and eastern Washington.