9 



POTENTILLA RECTA L. Sp. PI. 497- 1753- 



It somewhat resembles P. Niittallii in pubescence and general 

 habit, but differs in being paler and in its large pale yellow petals. 

 It is of European origin and occurs sparingly in the Eastern 

 States to the District of Columbia and to Ohio. 



The Argcntcae resemble in general habit the preceding group.. 

 The plants are very leafy, the leaflets generally 5 or those of the 

 upper leaves only 3, the flowers many and small, and the petals 

 scarcely exceed the sepals. The group is European, only P. 

 .argentea being also a native of North America. 



POTENTILLA INTERMEDIA L. Mant. i: 76. 1 767. 



This species very much resembles P. Monspeliensis, especi- 

 ally var. Noivegica, and has in this country been mistaken for it 

 It differs mainly in the mostly 5-foliolate leaves, the perennial 

 root and the style. The species is sparingly introduced in the 

 East. Some of the specimens are : 



Neiv Jersey diud Neiv York: Addison Brown, 1881 and 1880. 



POTENTILLA INCLINATA Vill. Hist. PI. Dclph. 3 : 567. 1 789. 



P. canescens Besser, Prim. Fl. Galic. i : 330. 1809. 



It much resembles the preceding species, but differs in a more 

 slender and simple stem and the grayish pubescence. The only 

 specimens collected on this continent that I have seen are those 

 collected in Ontario by Fowler. 



POTENTILLA ARGENTEA L. Sp. PL, 497- 1753- 



p. argentea is one of the easiest to identify, by its small flowers, 

 deeply dissected leaves, which are white-tomentose, especially be- 

 neath, and have revolute margins. It is a native of Europe and 

 Asia, as well as of America. In this country it extends from Nova 

 Scotia and the District of Columbia to Dakota and Kansas. 



POTENTILLA coLLiNA Wibel, Prim. FI. Werth., 267. 1799. 



This is another species that has been collected in the country 

 at least once, viz., by J. M. Holzinger (no. 30) at Winona, Minn., 

 in 1887- It differs from P. argentea, which it most resembles, by 

 its prostrate or spreading habit, less white-tomentose leaves, which 

 have broader lobes, and flat, not revolute margins. 



