56 RypDBERG: NOTES ON ROSACEAE 
Hypanthium subglobose, without a neck 
Leaflets casero ol eee ha and pubes- 
cent beneath; fruit 1.5 cm. t i 24. R. Bourgeauiana. 
Leaflets villous beneath; fruit ae I cm. 
thick. 25. R. acicularioides. 
Leaflets thick, strongly reticulate, and rugose; 
branches and even the prickles pubescent. 26. R. rugosa. 
Stem unarmed or when young covered with more or 
ess deciduous bristles. 
Sepals erect or connivent in fruit. 
Leaflets decidedly but finely pubescent be- 
neath. 27. R. blanda. 
Leaflets apa on both sides, shining. 28. R. subblanda. 
Sepals reflexed in fru 
Leaflets ciel oNarsient or short-pilose; ; 
9-15 mm. long; petals 1.7-2cm.long. 29. R. Williamsii. 
‘paats glabrous or nearly so; sepals 2-5 cm. 
ong; petals 2.5-3.5 cm. long. 30: johannensis. 
Infrastipular prickles present, more or less curved. 
Flowers mostly solitary; petals 2.5 cm. long or more: 
leaflets densely pubescent beneath. 31. R. spinosissima. 
Flowers corymbose; petals about 2 cm. long; leaflets finely 
puberulent beneath. 32. R. palustriformis. 
21. RosA ARKANSANA Porter 
Collected in Wisconsin. 
22. ROSA SUFFULTA Greene 
Collected near the Bureau of Standards, Washington, D. C. 
This and the preceding species belong to the prairies and plains 
west of the Mississippi River and will be treated in a subsequent 
article. 
23. RosA AcICULARIS Lindley 
This species was originally described from Siberian material, 
but Alaskan specimens match exactly Lindley’s figure and so do 
specimens from Siberia. Specimens from the southern and eastern 
limits of its range differ a little, in having smaller and less firm 
leaflets, less glaucous beneath, and smaller flowers. They differ 
from R. Engelmannti and R. Bourgeauiana in the leaflets, which are 
narrower and decidedly pubescent beneath; from the former in 
the simple teeth and the lack of glandular granules on the lower 
ieaf-surfaces, and usually in the larger fruit; and from the latter 
In the elongate fruit with a distinct neck. All specimens from 
