88 MEMOIRS FEOM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Illustrations : Lehm. Men. Pot. pi 16. Plate 34, /. 1, dissection of flower, /. 2 ; 

 pistil,/. 3; stamen, /; 4; fruiting hypanthium, /. 5. 



Somewhat tufted. Stems several from the stout caudex, few-flowered, 1-3 dm. high, 

 villous with spreading white hairs. Stipules ovate to elliptic, 10-15 mm. long, the 

 lower scarious and brown, the upper silky and white-torn entose. Basal lea^'es stout- 

 petioled, ternate, densely silky above and densely white-tomentose and with prominent 

 A'oins beneath ; leaflets 2-1 cm. long, broadly cuneate, obovate or nearly orbicular, the 

 lateral ones much oblique, coarsely toothed. Stem leaves few, smaller and subsessile. 

 Flowers 2-3 cm. in diameter. Hypanthium densely villous, in fruit 15-20 mm. in diam- 

 eter ; bractlets elliptic or broadly ovate, equalling or exceeding the triangular-ovate 

 sepals. Petals yellow, broadly obcordate, exceeding the sepals by one-half 



Watson follows Regel & Tiling in placing P. villosa as a variety under P. fragifonnh. 

 The two resemble each other in one important character, viz., the broadly oval obtuse 

 bractlets, which, as well as the calyx, enlarge considerably in fruit. P. villom differs 

 from P. fragiformis, however, in the leaves as well as in the flowers; those of the former 

 are much thicker, densely silky above (rarely glabrate), and densely floccose and with 

 prominent veins beneath. The flowers are about one-half larger than those of frajji- 

 fonnis. It dilfers from all the species of the group in the large flowers, 2-3 cm. wide, 

 stout habit, large leaves and broad bractlets. P. villosa is a nati^'e of Alaska and adja- 

 cent Asia, but is also found in the mountains of British (Jolumbia, A^ancouver Island and 

 AVashington. 



Potentilla villosa chrysocoma. 



PotentUIa villoma aurca Lehm. Pug. Stirp. 9 : 67. 1851. Not P. aurca L. 

 Lehm. Rev. Pot. 171. 



Pubescence of the whole plant yellow. It approaches P. Vahliana in some respect. 

 Alaska: B. J. Bretherton (Kodiak), 1894; Ferd. Bishofi" (Sitka) 1865-6; Esch- 

 scholtz (Unalaska). 



70. Potentilla uniflora Ledeb. 

 PotenflUa uniflora Ledeb. Mem. Acad. Petersb. 5: 543. 1812. 

 Lehm. Mon. 29 & 183; Ser. in DC. Prod. 2 : 572; Sprengel, Syst. Yeg. 2 : 541. 

 Potentilla macrantha uniflora Don, Gard. Diet. 2 : 550. 1832. 

 Potentilla nivea r Torr. & Gray, Fl. N. Am. 1 : 441. In part. 1840. 

 Potentilla villom uniflora Ledeb. Fl. Eoss. 2: 58. 1844. 



Potentilla nirea j macraufha f uniflora Lehm. Del. Sem. Hort. Hamb 1850" 11 

 1850. Stirp. Pug. 9: 68; Rev. Pot. 167. ' ' ' 



