Potentilla nivea L.

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Potentilla niVEa Altaica (Bunge) Rydb. Mem. Dep. Bot. Co-
lumbia Uni. 2: 86. 1898
Potentilla nivea var. arenosa Lange Consp. FI. 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.
FI. 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 Fjprd, 1831,7! Vahl; Scoresby Sound,
1892, N Hartz; Kakatsiak, 1885, 5*. Hanson; Christianshaab,
1884, Warming <5* Holm; rocks behind Kuanersuit on Disco,
1898, M. Pedersen 2J02-5, 2107—9 (?) ; * Christianshaab, 1833,
J. Vahl (?). t
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f This was determined by Lange as var. tirostrata but it does not agree with Rott-
boell’s description especially as to the glomerate heads, sinaate-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.
* All of Mr. Pedersen’s specimens are gterflgand 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
be determined satisfactorily.
; oLy/¡^ Piantae groenlandicae
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4 GROENi OCCIDENT.; Disco,
£ f. f 1898* Le°-Morten Pederson- Nr
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