514 NORTH AMERICAN FLORA [VoLUME 22 
ular-denticulate on the margin, the free portion ovate, 5—7.5 mm. long; rachis and petiole 
finely pubescent and with sessile glands; leaflets 5—7, oval or ovate, 2—3.5 em. long, acute or 
obtuse, glabrous and dark-green above, sparingly and finely pubescent and paler beneath, 
coarsely and simply serrate; flowers mostly solitary; pedicels 2-3 cm. long, glabrous and 
smooth; hypanthium glabrous, obovate, usually acute at the base, without distinct neck, when 
ripe fully 2 cm. long and 15-18 mm. broad; sepals narrowly lanceolate, acuminate, finely 
pubescent on the back, tomentose within, glandular on the margins, erect and persistent in 
fruit; petals obcordate, 2—2.5 cm. long, rose-colored; styles numerous, distinct, not exserted. 
TYPE LOCALITY: Four-miles Hill, Routt County, Colorado. 
DISTRIBUTION: Mountains of Colorado (and Utah?). 
69. Rosa columbiana Rydberg, sp. nov. 
Stem brown, about 1 m. high, armed with recurved strong prickles 5-10 mm. long and 
broad at the base; stipules 1-2 cm. long, adnate, dilated, glandular-dentate on the margin 
and glandular-pruinose on the back; petiole and rachis more or less glandular-pruinose; leaflets 
5-7, broadly oval, 1-4 cm. long, occasionally double-toothed, glabrous above, sparingly pubes- 
cent and glandular-granuliferous beneath; flowers solitary or in pairs; pedicels 1-2 cm. long, 
glabrous; hypanthium globose, glabrous, in fruit about 12 mm. thick, without a distinct neck; 
sepals ovate-lanceolate, caudate-attenuate, about 2 cm. long, rarely if at all sparingly glandular 
on the back, villous on the margin, in fruit erect and persistent; petals obcordate, about 2.5 
cm. long; styles persistent, distinct, not exserted. 
Type collected in the valley of Little Potlatch River, Latah County, Idaho, June 13, 1892, 
Sandberg, MacDougal & Heller 381 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Oregon, Washington, and western Idaho. 
70. Rosa myriadenia Greene, Leaflets 2: 263. 1912. 
Stems low, with spreading branches, dark-brown, glabrous, armed with paired infra- 
stipular prickles, which are slender, terete, 5—8 mm. long, distinctly curved; leaves 5-foliolate; 
stipules broad, about 1 cm. long, adnate, strongly glandular on the margin and the back; 
petioles and rachis densely glandular and slightly prickly; leaflets oval, 1-2 cm. long, doubly 
serrulate with gland-tipped teeth, dark-green and glabrous above, paler and rather densely 
pilose beneath, as well as glandular on the veins; flowers solitary or 2 or 3 together; pedicels 
glabrous, 1 cm. long or less; hypanthium globose, subglabrous, with a short neck; sepals 
lanceolate, caudate-attenuate, conspicuously glandular-hispid or even prickly on the back; 
petals obcordate, about 1.5 cm. long; styles persistent, distinct, not exserted. 
TYPE LOCALITY: Huckleberry Mountain, Jackson County, Oregon. 
DISTRIBUTION: Known only from the type locality. 
71. Rosa spinosissima L. Sp. Pl. 491. 1753. 
Rosa cinnamomea I,. Syst. Nat. ed. 10. 1062. 1759. Not R. cinnamomea LL. 1753. 
Stem slender, 1-2 m. high, brown, terete, armed with short curved prickles; floral branches 
1-2 dm. long, often unarmed; stipules dilated, more or less convolute, about 2 cm. long, dentate 
on the margins, finely puberulent; rachis and petiole tomentulose; leaflets 5 or 7, rarely 3, 
elliptic, simply serrate, dull-green, sparingly puberulent above, densely-pubescent beneath, 
1.5—4 cm. long; flowers solitary or few together; pedicels 2-3 cm. long, glabrous; hypanthium 
globose, glabrous, in fruit 12-15 mm. thick, scarlet; petals dark rose-colored, 2—2.5 cm. long, 
obcordate; sepals lanceolate, attenuate, 2 cm. long, glabrous on the back, tomentose on the 
margins, in fruit erect and persistent; styles distinct, persistent, not exserted; achenes inserted 
both in the bottom and on the sides of the hypanthium. 
TYPE LOCALITY: Europe. 
DISTRIBUTION: Europe and northern Asia; cultivated and occasionally escaped in the eastern 
states and Wisconsin. 
ILLUSTRATIONS: Fl. Dan. pl. 1214; Engl. Bot. pl. 2388; Schrank, Fl. Monac. pl. 40; Redouté, 
Roses 1: 133, pl.; 1: pl. opp. 105 (double); Lindl. Ros. Monog. pl. 5; Cycl. Am. Hort. f. 2159, f. 2160; 
Willm. Gen. Rosa #l. opp. 141; pl. opp. 143. 
