Arctic Plants: Morphology and Synonymy 63 b 



climate. Kjellman * has expressed the view that the plant like several others 

 reached the arctic countries at a time, when the climate was more suitable to its 

 existence. Nathorst has reached the same conclusion relative to its occurrence 

 m Spitzbergen. 



Figure S. 



1. PeiasUes frigida (L.) Fr., showing the rhizotne, the leafy shoots, and the base of a flower 

 bearing stem; natural size; specimen from T^ee river. 2. Same species, showing the 

 matured foliage; two-thirds of the natural size; specimen from Herschel island. 3, 4 and 

 5. Basal leaves of Senedo resedifoUus Less.; natural size; specimens from Hersche island. 



Arnica alpina (L.) Olin. 



Several very tall specimens, measuring from 25 to 30 cm. in height, and 

 bearing three heads were collected at Bernard harbour and on the south coast 

 of Coronation gulf. There is a horizontally creeping rhizome of considerable 

 length, densely covered with remnants of leaves, and with many slender, un- 

 branched, secondary roots proceeding from the lower face of the internodes. At 

 the apex of the rhizome a few pairs of opposite, green leaves are situated sur- 

 rounding the base of the flower-bearing stem. Characteristic of Arnica is that 

 the rhizome bears only green leaves, none scale-like. 



1 Ur Polarvaxternas lif. (I.e. p. 504). 



