148 UNIVERSITY OF MISSOURI STUDIES [296 



236. ROSA L. Rose. Brier. 



576. R. pratincola Greene. Prairie rose. 



Common on the plains and mesas, 5100-6000 ft. (Daniels, 



58). 

 Minnesota to Alberta; Kansas to Colorado. 



576a. R. pratincola angustiarum Cockerell, n. var. Castle 

 Rock rose. 



Boulder Canon, 7340 ft. (near Castle Rock), Sept. 22, 1907, 

 growing close to R. Engelmanni Wats. 



Low bush. Flowers corymbose, often four together. 



Sepals foliolar-tipped, narrow tomentose, with scattered 

 large dark marginal stalked glands, these last present or absent 

 on same branch. No lateral lobes. Length of sepals prox. 17 

 mm. Sepals in fruit erect. 



Fruit depressed globose, very shiny, with no sign of a neck. 

 r Long, (mm.) 11. 91/0. 11. 10. 10. Meas- 



Five fruits -/ ured while fresh. 



( Lat. (mm.) 13. 11. 12. 10 ^,. ioi/2- 



Twigs and peduncles deep crimson. Penduncles minutely 

 hairy. 



Branches with straw colored, fairly numerous, straight slen- 

 der prickles, the larger ones about 7 mm., long; infrastipular 

 prickles normally absent. 



Stipules broad, to 8)4 mm., margins dentate, more or less 

 glandular. 



Leaflets: a series of leaves counted showed leaflets: 11. 9. 9. 

 10. 9. 9. 7. 5. II. 9. II. 9. 9. II. 9. 9. II. II. 9. 3, 



Leaflets; cuneate basally, simply and strongly toothed, very 

 finely but closely pubescent beneath. Terminal leaflet long. 

 26., lat. I2,y2 mm. 



Frequently one or two leaflets from between auricles of sti- 

 pules, as in R. suffulta. Stipules convolute as in R. IVoodsii, 

 but leaves not shining. (Cockerell, MS., Oct. 1907.) 



576b. R. pratincola setulosa Cockerell. N. var. 

 Fruit bristly. Bluebell Caiion (Cockerell), 1910. 



