ROSA IN NORTH DAKOTA I37 



b. Petioles, petiolules and rachis gla- 

 brous, lower surface of leaf and median 



nerve glabrous or nearly so 7. R. deserta. 



b. Petioles, petiolules, rachis and lower 

 median nerve of leaflet glandular-hispid, 

 leaflets pubescent and resinous be- 

 neath S. R. poetica sp. nov. 



a. Leaf-rachis not at all, or irregularly 

 prickly. Leaflets densely pubescent beneath. 

 b. Spines stout and straight or some- 

 what curved. . . .9. R. terrens {R. Maximiliani Nees?). 

 b. Spines straight and slender. 



c. All the parts very crowded. In 

 rolling prairies, ravines, thickets 



and open woods 10. R. suhnuda. 



c. The parts not crowded at all. 

 In dense woodland, bordering 

 rivers 11. R. naiaduni sp. nov. 



I. Rosa heliophila Greene. 



Vide leaflets II, 132 (191 1), to replace the untenable name 

 R. pratincola, to be found in Pittonia IV, 13, (1899), previously 

 applied to a species of European origin. As this is the common 

 prairie rose, growing everywhere on high and low virgin prairie, 

 and also in cultivated fields, it is without doubt the plant suggested 

 by our present governor, L. B. Hanna in 1907 and approved by 

 the legislature as the State Flower of North Dakota. 



2. Rosa heliophila var. foliosissima. Vide Midi. Nat. 

 157, (1912). 



3. Rosa Ltinellii Greene. Vide Leaflets II, 132, (191 1). 



4. Rosa gratiosa. Vide Midi. Nat. II, 154, (1912). 



5. Rosa gratiosa var. dulcissima. 



Though the pinnatifid outer sepals are a constant character 

 in the shrub used as type, and though they are a strong character 

 in other species, they are irreliable in this special group of roses, 

 and I have for this reason reduced the species described in Midi. 

 Nat. II. 2S7, (1912) to variety rank. 



