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INTRODUCTION TO PLANT GEOGRAPHY 



[chap. 



F"u;. 122. — Lichen barrens m lire uplands ol central Baffin Island, looking south. 

 Note the virtual absence of higher plants and the abundance of persistent snow- 

 patches on north-facing slopes. 





Fig. 123. — Monotonous tract of prairie-like fell-field in the vicinity of the Magnetic 

 North Pole, Prince of Wales Island, Canadian Arctic Archipelago. The sparse 

 vegetation consists of scattered diminutive herbs, terricolous Lichens, and occa- 

 sional tufts of Arctic Avens, all growing in open formation. 



