ROSA PRATINCOLA GREENE 307 



prickliness of the sterile and fertile branches. Naked and 

 I)rickly flowering branches may be found on the same plant. 



Leaves 



Number of leaflets. — The maximum number of leaflets is com- 

 monly 11 though it may be 7 or 9. On individual plants the 

 variation may be 5 to 7; 5 to 9; 7 to 9; 7 to 11 and 9 to 11. 



LengtJi of leaflets. — The average length is about 2.5 cm. They 

 vary from 1.5 to 4.5 cm. 



Surface. — The upper and lower surfaces usually have a grayish 

 cast due to the presence of soft hairs. However, both may be 

 glabrous. On an individual plant there may be naked and scant 

 pubescent surfaces, both upper and lower. 



Rhachis 



Surface. — The rhachises are frequently covered with short hairs 

 but occasionally, scattered among these hairs, there are stipitate 

 glands or prickles. 



On one plant the rhachises may be naked and glandular-hispid; 

 pubescent and glandular-hispid ; pubescent, occasionally prickly, 

 and glandular-hispid ; or pubescent and occasionally prickly. 



Stipules 



Form. — The several types of stipules are shown on the plate, 

 narrow, medium, and rather dilate. The narrow stipule is the 

 prevailing form. Narrow and dilate stipules are occasionally 

 found on the same plant. 



Margin. — The margins of the stipules may be ciliate, ciliate and 

 glandular-hispid, or ciliate and glandular-toothed. 



Inflorescence 



Form. — Seldom does R. pratincola bear a solitary flower; it is 

 usually a corymb, sometimes of twenty to thirty buds and flowers. 

 The pedicels are short and commonly glabrous, only a small per 

 cent being glandular-hispid and a few pubescent. A few glandular- 

 hispid hypanthiums were found, the remainder being glabrous. 



Color of buds and flozvcrs.— The varied hues and markings defy 

 accurate representation with paper and pencil. A mere outline 

 of the extent of variation is all that will be attempted. 

 . The range is typified for large areas by the colors of the buds 

 and flowers found along a half mile of prairie roadside in Dickin- 



