Rydberg : Further Studies on the Potentilleae 181 



Mem 



lumbia Uni, 2: 86. 1898 



Potentilla nivea var. arenosa Lange Consp. Fl. Gr. 236. Not 

 Turcz, 



The specimens collected by Warming and Holm were deter- 

 mined by Lange as P. nivea arenosa Turcz. but that variety is 

 described as having glomerate flowers, which is not the case in 

 Warming and Holm's specimens. These do not differ from the 

 common form of P. nivea Altaica except that the flowers are some- 

 what smaller. In fact they are as like the figure in Ledeb. Icon. 

 Fl. Ross. 4 : 329 as I have seen. If Lange's determination in 

 this case were correct the varieties Altaica and arenosa must be 

 united. I think, however, that the latter is quite different and re- 

 stricted to Asia. The following specimens belong here and are 

 not recorded in Conspectus Florae Groenlandicae : 



Greenland : Amaralik Fjord, 183 1,/. Vahl ; Scoresby Sound, 

 1892, N. Hartz ; Kakatsiak, 1885, S. Hanson; Christianshaab, 

 1884, Warming & Holm; rocks behind Kuanersuit on Disco, 



^> 



1898, M. Pedersen 2702-5, 2707-9 (?) ; * Christianshaab, 1833, 

 / Va/zl(?).f 



Potentilla nivea pallidior Sw. Sum. Veg. Scand. 19. 1874 



Potentilla nivea snbviridis Ledeb. Fl. Ross. 2:57. 1844. 



The following specimens belong here : 



Greenland: Scoresby Sound, 1892, N. Hartz; Godhavn, 

 1 87 1, Th. Fries. 



" Potentilla subquinata (Lange) 



Potentilla nivea pentaphylla Lehm. Nov. Stirp. Pug. 9 : 69. 

 '851. Not P. pentaphylla Richt 181 5 ; P. nivea subquinata 

 La nge, Consp. Fl. Groenl. 9. 1880 ; P. nivea quinquefolia Rydb. 



All of Mr. Pedersen's specimens are sterile and without fully developed leaves. 

 They are remarkable for their long branching caudices and may belong to the variety of 

 the next species described below or perhaps to an undescribed species. They cannot 



°e determined satisfactorily. 



t This was determined by Lange as var. trostrata but it does not agree with Rott- 

 boell's description especially as to the glomerate heads, sinuate-dentate leaves, revolute 

 margins and purple veins. I refer this doubtfully here as it differs from all other speci- 

 mens seen in the narrow leaflets. 



