ROSACEAE. 187 



9. SIBBALDIA L. 



i. Sibbaldia procumbens L. On alpine peaks and in arctic regions from 

 Greenl. and Alaska to N. H., Colo, and Calif.; also in Europe and Asia. 

 Alt. 10,000-14,000 ft. Massif de 1'Arapahoe; Red Mountain, south of Ouray; 

 Silver Plume; Mt. Harvard; West Spanish Peak; Tennessee Pass, seven 

 miles west of Leadville; near Pagosa Peak; Boreas; Cameron Pass; Little 

 Kate Basin, La Plata Mountains; Beaver Creek; Leroux Creek; Rabbit-Ear 

 Range; Berthoud Pass. 



10. DASIPHORA Raf. SHRUBBY CINQUEFOIL. 



i. Dasiphora fruticosa (L.) Rydb. (Potentilla fruticosa L.) In meadows 

 and on rocks from Lab. and Alaska to N. J., N. M. and Calif. Alt. about 

 10,000 ft. Vicinity of Como; North Park; Berthoud Pass. 



ii. CHAMAERHODOS Bunge. 



i. Chamaerhodos erecta (L.) Bunge. On dry plains from Sask. and Alaska 

 to Colo. Alt. up to 9000 ft. South Park, southeast of Jefferson. 



12. DRYMOCALLIS Tourr. 



Petals white; leaves densely and coarsely hairy. i. D. arguta. 



Petals yellow ; leaves sparingly and finely pubescent. 



Corolla 15-20 mm. in diameter; petals much exceeding the sepals. 



2. D. fissa. 

 Corolla 10-15 mm. in diameter; petals slightly if at all exceeding the sepals. 



3. D. glandulosa. 



1. Drymocallis arguta (Pursh) Rydb. On prairies, plains, meadows and 

 hillsides from N. B. and Mackenzie to D. C. and Colo. Table Rock; Steam- 

 boat Springs. 



2. Drymocallis fissa (Nutt.) Rydb. (Potentilla fissa Nutt) In the moun- 

 tains from Mont, to Colo. Alt. 6000-12,000 ft. Near Narrows, Rist Canon; 

 Horsetooth Gulch ; Dixon Canon ; Beaver Creek ; Table Rock ; Empire ; Bear 

 Creek Canon; Wyoming State line; Pennock's mountain ranch; Beaver 

 Creek; summit of North Park Range, Larimer Co. 



3. Drymocallis glandulosa (Nutt.) Rydb. (Potentilla glandulosa Nutt) 

 In the mountains from Alb. and B. C. to S. D., N. M. and Calif. Leroux 

 Creeks, Delta Co.; Rist Canon. 



13. GEUM L. AVENS. 

 Petals yellow, clawless. 



Upper internode of the style long-hairy ; lower not glandular ; petals 5-7 mm. 



long. i. G. strictum. 

 . Upper internode of the style sparingly short-hairy ; lower more or less glandular- 



puberulent ; petals 4-5 mm. long. 2. G. oregonense. 



Petals pink or purplish, more or less clawed. 3. G. rivale. 



i. Geum strictum Ait. In low meadows and among bushes from Newf. 

 and B. C. to Pa., Mo. and Mex. Alt. 4000-10,000 ft. Headwaters of Sangre 

 de Cristo Creek; Mancos; Stove Prairie, Larimer Co.; Moon's ranch; Buena 

 Vista ; Victoria ; Piedra ; Gunnison ; Parlin, Gunnison Co. ; Silver Plume ; 



