338 



INTRODUCTION TO PLANT GEOGRAPHY 



[chap. 



Great Lakes and the upper reaches of the Gulf of St. Lawrence 

 and westwards beyond the Mississippi ; (2) in temperate western 

 Europe whence they extend eastwards to the LTrals as a wedge 

 between the northern coniferous forests and the southern steppes, 

 reappearing in the Caucasus region ; (3) in northern Japan and 

 adjacent parts of eastern continental Asia ; and (4) in the southern 



Fig. 94. — Leafless condition »t nu.vcd dcciJuoLu^ .■.ununer loic.^i in northeastern 

 United States — in winter. 



hemisphere in limited parts of Patagonia, southern Chile, and Tierra 

 del Fuego. In all these regions there is a cool to severe winter 

 but otherwise temperate and moist climate, with some precipitation 

 all the year round, and a total of from 70 to 151 or more cm. (approxi- 

 mately 28 to 60 inches) annually. 



In contrast to the situation in most tropical forests, the trees in 

 deciduous summer forests form only a single main stratum or storey. 



