ROSACEAE. 183 



Leaves nearly equally white on both sides ; upper leaflets not decurrent. 



31. P. Hippiana. 

 Leaves greener above ; upper 3 leaflets more or less decurrent on the rachis. 



32. P. propinqiia. 

 Bractlets much shorter than the acuminate sepals ; leaves merely floccose ; hence 



dull. 



Leaves thick, densely floccose; pistils numerous. 33. P. effusa. 



Leaves thin ; tomentum sparse and more or less deciduous ; pistils few. 



34. P. coloradensis. 

 Leaves grayish silky. 



Stem stout, erect, 6-7 dm. high ; leaflets obovate or oblong, coarsely serrate, the 



upper decurrent on the rachis. 35. P. ambigens. 



Stem 1-4 dm. high ; leaflets cuneate, toothed at the apex only, conduplicate, 

 none decurrent. 36. P. crinita. 



1. Potentilla paradoxa Nutt. (P. supina Am. auth. ; not L.) In wet places 

 from Ont. and Wash, to N. M. ; also Mex. and western Asia. Steamboat 

 Lake. 



2. Potentilla rivalis Nutt. In wet places from Sask. and Ore. to Mex. 

 Alt. up to 8000 ft. Lee's Lake; along the Conejos River, north of Antonito; 

 Ft. Collins; Quimby; along the Platte River, Denver; Georgetown; New 

 Windsor. 



3. Potentilla leucocarpa Rydb. (P. milligrana Engelm. ; not Dougl.) In 

 wet meadows from 111. and Wash, to N. M. and Calif. Poudre Canon ; Mid- 

 dle Park; Steamboat Springs. 



4. Potentilla lateriflora Rydb. (P. biennis Rydb., in part; not Greene) In 

 loose soil from Ass. and B. C. to Colo, and Ariz. Alt. about 8000 ft. 

 Gunnison. 



5. Potentilla monspeliensis L. (P. norvegica hirsuta T. & G.) In fields 

 and waste places from Lab. and Alaska to D. C. and Mex. Alt. up to 8000 

 ft. Along Conejos River, north of Antonito; Rist Canon; Soldier Canon; 

 Gypsum ; La Porte ; Ft Collins ; Rocky Ford ; near Boulder ; Gunnison ; Iron- 

 ton Park; Ruxton Park; New Windsor; Pagosa Springs; Green Mountain 

 Falls ; Pike's Peak ; Placer Gulch ; Beaver Creek. 



6. Potentilla concinna Richardson. (P. humifusa Nutt.) Dry hills and 

 mountains from Sask. and Alb. to Colo, and Utah. Alt. 5000-10,000 ft. 

 Devil's Causeway; North Park; Empire; Lake City; Georgetown; Cameron 

 Pass; Mt. Abram; Cumberland Mine, La Plata Mountains; Little Kate 

 Mine; West Spanish Peak; Little Veta Mountain; headwaters of Sangre de 

 Cristo Creek; Spicer, Larimer Co. 



7. Potentilla bicrenata Rydb. Dry mountains of N. M. and Colo. 

 " Colorado." 



8. Potentilla quinquefolia Rydb. (P. nivea subquinata Lange; P. nivea 

 pentaphylla Lehm.) On dry mountains from Greenl. and B. C. to Colo. 

 Alt. 10,000-14,000 ft Cumberland Mine, La Plata Mountains; West Spanish 

 Peak; Mt. Hesperus; Hahn's Peak. 



9. Potentilla dissecta Pursh. (P. diversifolia Lehm.) On hills and moun- 

 tain sides from Sask. and B. C. to Colo, and Calif. Alt up to 13,000 ft 

 Lake City; headwaters of Clear Creek; Cameron Pass; Lake City; Caribou; 

 Willis Gulch; Pagosa Springs; Carson; Alpine Tunnel; Buffalo Pass Park; 

 Mt. Princeton; Little Kate Mine; Ouray; Estes Park; Spicer. 



