ROSE FAMILY 441 



Leaflets very thin, scarcely paler beneath, with distinct reticulations. 



Leaflets not very thin, pale and indistinctly reticulate beneath. 



30. R. leucopsis. 



1. R. arkansana Porter. Stem erect, 2-4 dm. high, copiously bristly, 

 mostly simple, killed back to near the root; glabrous or nearly so, glandular- 

 toothed; rachis and petiole glabrous or sparingly pilose, sometimes glandular; 

 leaflets elliptic, 1.5-6 cm. long, glabrous and shining, coarsely and sharply ser- 

 rate; hypanthium subglobose, glabrous, without a neck, in fruit 12-15 mm. broad; 

 sepals somewhat glandular on the back; petals obcordate, 2-2.5 cm. long. Plains 

 and canons: Colo. Kans. Wis. Minn. Plain Submonl. Je-Jl. 



2. R. Lunellii Greene. Stem erect, simple, 1-3 dm. high, densely bristly; 

 sepals glabrous or nearly so, sometimes glandular, entire or gland-toothed on the 

 margins ; petiole and rachis glabrous or sparingly puberulent, sometimes glandu- 

 lar; leaflets elliptic or oval, serrate, 1-2.5 cm. long, glabrous on both sides or 

 sparingly pubescent on the veins beneath; hypanthium globose, glabrous, in 

 fruit orange-red and 10-12 mm. thick; sepals glandular on the back; petals 

 rarely 2 cm. long, obcordate. Plains and hills: Man. N.D. S.D. Plain 

 Submont. Je-Jl. 



3. R. suffulta Greene. Stem erect, 3-5 dm. high, usually simple, dying 

 back to near the ground, densely bristly, green; stipules densely and finely pubes- 

 cent, glandular-dentate on the margins; leaflets obovate, 1.5-4 cm. long, light 

 green, finely and rather densely pubescent on both sides or in age glabrate above, 

 densely serrate; rachis and petiole finely pubescent; hypanthium globose, gla- 

 brous or rarely bristly, in fruit about 1 cm. broad; sepals somewhat glandular on 

 the back; petals obcordate, 2-2.5 cm. long. R. arkansana S. Wats., not Porter. 

 R. pratincola and R. heliophila Greene. Prairies and plains: 111. Tex. N.M. 

 Wyo. Alta. Man. Plain Submont. Je-Au. 



4. R. alcea Greene. Stem low, 1-3 dm. high, terete, densely bristly, even 

 the floral branches; stipules puberulent, and glandular-hispid and even bristly 

 on the back, glandular-ciliate on the margins, rather broad; rachis and petiole 

 puberulent and glandular; leaflets obovate, 1-2 cm. long, serrate above the middle, 

 glabrous above, finely and densely pubescent and strongly veined beneath; 

 hypanthium globose, glandular-bristly; sepals glandular-hispid on the back; 

 petals obcordate, 15 mm. long. Plains: Sask. N.D. Man. Colo. Plain. 



5. R. collaris Rydb. Stem bristly, but not copiously so, yellowish green, 

 about 1 m. high; stipules glandular-dentate, slightly puberulent; petiole and 

 rachis somewhat puberulent and glandular; leaflets mostly 5, oval, coarsely ser- 

 rate, 1-3 cm. long, glabrous above, finely puberulent beneath; hypanthium small, 

 ellipsoid, contracted into a rather long neck, glabrous; sepals 8-10 cm. long, 

 lanceolate, attenuate, with rather short tips, glabrate on the back. River 

 banks: Ida. Jl. 



6. R. Engelmannii S. Wats. Stem low, 3-5 dm. high, densely bristly, 

 but rarely prickly; stipules rarely pubescent, conspicuously glandular-granu- 

 liferous and glandular-ciliate; petiole and rachis more or less glandular; leaflets 

 5 or 7, oval, 1-3 cm. long, doubly glandular-serrate, shining above, paler beneath; 

 hypanthium decidedly ellipsoid or pear-shaped, in fruit 8-10 mm. thick, and 12- 

 15 mm. long, with a distinct neck; sepals slightly if at all glandular; petals broadly 

 obcordate, about 2.5 cm. long. Woods: Colo. s Mont. N.D. Submont. 

 Mont. Je-Jl. 



7. R. acicularis Lindl. Stem low, about 1 m. high, densely covered with 

 straight bristles or weak prickles; stipules pubescent, more or less glandular- 

 granuliferous and glandular-ciliate; leaflets 3-7, usually 5, elliptic or oval, 1.5-5 

 cm. long, simply and regularly serrate, dull and glabrous above, pale and finely 

 and densely pubescent beneath; hypanthium glabrous, pear-shaped or elliptic, 

 in fruit 1-1.5 cm. broad and 1.5-2 cm. long, usually with a neck; sepals pubescent 

 and more or less glandular on the back; petals obcordate, 2-2.5 cm. long. Woods: 

 Alaska Wyo. Mich. N.Y. Boreal Mont. Je-Au. 



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