506 NORTH AMERICAN FLORA [VoLUME 22 
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 dis- 
tinct, 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. 
45. Rosa Bushii Rydberg, sp. nov. 
Stem terete, branched, about 1 m. high, densely bristly but not prickly, dark-brown; 
stipules adnate, entire, narrow or the upper dilated, 1-1.5 cm. long, grayish-pubescent; rachis 
and petiole pubescent but not glandular; leaflets obovate or elliptic, 1-2.5 em. long, acute at 
the base, obtuse or rounded at the apex, finely serrate, dark-green, glabrous or sparingly 
pubescent above, softly pubescent beneath; flowers corymbose; pedicels 1-2.5 cm. long, gla- 
brous; hypanthium pear-shaped, acute at the base, in fruit 10-12 mm. thick, glabrous; sepals 
narrowly lanceolate, caudate-acuminate, glandular-hispid on the back, in age erect and per- 
sistent; styles not exserted, distinct, persistent; achenes inserted on the side walls as well as in 
the bottom of the hypanthium. 
Type collected at Courtney, Missouri, July 2, 1909, Bush 5860 (type in herb. N. Y. Bot. Gard.). 
46. 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 em. 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. 
47. Rosa Butleri Rydberg, sp. nov. 
Stem about 1 m. high, densely bristly, dark-brown, terete, without infrastipular prickles; 
branches usually also densely bristly; lower stipules narrow, the upper dilated, adnate, glandu- 
lar-denticulate on the margins, glandular-pruinose on the back, the free portion lanceolate or 
ovate, ascending; petiole and rachis glandular-pruinose; leaflets 5 or 7, obovate, rounded at 
the apex, cuneate at the base, 1-4 cm. long, coarsely serrate except towards the base, dark- 
green and glabrous above, paler, sparingly pubescent and glandular-pruinose beneath; flowers 
mostly solitary; pedicels 1-3 cm. long, glabrous; hypanthium glabrous, ellipsoid, with a distinct 
neck; sepals narrowly lanceolate, caudate-attenuate and often with dilated tips, 2-3 cm. 
long, after anthesis erect and persistent; petals rose-colored, obcordate, about 3 cm. long; 
styles distinct, persistent, not exserted; achenes inserted in the bottom and on the sides of 
the hypanthium. 
TYPE LOCALITY: Helena, Montana, June 28, 1908, B. T. Butler 796 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Western Montana and southwestern British Columbia. 
48. Rosa Engelmanni S. Wats. Garden & Forest 2: 376. 1889. 
Rosa acicularis Engelmanni Crépin; L. H. Bailey, Cycl. Am. Hort. 1555. 1902. 
Stem low, 3-5 dm. high, densely bristly but rarely prickly; floral branches usually also 
bristly; stipules adnate, rather narrow or the upper more or less dilated, rarely pubescent, 
but conspicuously glandular-granuliferous and glandular-ciliate, 1-2 cm. long, the free portion 
usually ovate; petioles and rachis more or less glandular; leaflets 5 or 7, oval, 1-3 cm. long, 
