Collection of Arctic Plants. 387 
ROSACEZ. 
17. Dryas octopetala. Linn. Sp. Pl. p. 717. 
Var. minor, folus parvis angustis profunde crenatis. 
Found on mountains in the south of Europe, as the Py- 
renees, the alps of Switzerland, Savoy, Austria, Britain, Ice- 
land, Lapland, Siberia, Greenland, &c.; high mountains in 
the north-western part of Canada (Pursh); and the woody 
country of North America, between latitude 54” and 64° north 
(Richardson). 
In Britain this plant prefers a calcareous or limestone soil. 
I possess specimens with the lower half of the leaves crenate, 
while the upper are entire; thus appearing to unite the two 
species octopetala (or chamedryfolia, as Pursh calls it, the 
number of petals being variable,) with the integrifolia (tenella 
of Pursh). 
18. Potentilla nivea B, supra in Pl. of Greenland. 
POLYGONEZ. 
19. Polygonum viviparum, supra in Pl. of Greenland. 
20. Oxyria reniformis, supra in Pl. of Greenland. 
AMENTACEZÆ. 
21. Salir polaris. Wahl. Fl. Lapp. p. 261. t. 13. f. 1. 
This appears to have been first discovered in Spitzbergen 
by Martins; afterwards by Wahlenberg and Liljeblad in Lap- 
land. These, I believe, are the only stations for this interest- 
ing plant. : 
VOL. XIV. SE The 
