THE WILLOWS AND POPLARS 



87 



Fig. 17. Sketch Map of Europe Showing the Southern Limits of the 



Continental Ice Sheet, the Present Distribution (lined areas) and 



THE Pleistocene Occurrences of Salix polaris (Modified 



FROM Nathorst, 1891) 



1. Vicinity of Edinburgh. 



2. Localities in Yorkshire. 



3. Localities in Norfolk and Suffolk. 



4. Devonshire. 



5. Numerous localities in the Alps. 



6. Localities in Bavaria. 



7. Localities in Jutland. 



8. Localities in Zeeland. 



9. Numerous localities in North Germany. 



10. Localities in Esthonia, Livonia and Vitebsk. 



11. Numerous localities in Schonen, Gotland and Jemtland. 



12. Felek in Hungary. 



