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. propinqua. 

 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 Caiion ; 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 Caiion; Soldier Caiion; 

 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. nivca 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. (F 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. 



