COLORADO WILD FLOWERS 5 



handsome. There are many lakes and ponds. The climate resembles 

 that of Hudson's Bay. 

 5. Alpine zone — above the limit of tree growth. Flowering herbs are 

 numerous; those in drier situations are small and matted with a pro- 



Fig. 5. — Prickly Poppy (Argemone intermedia) 

 A tall, coarse plant with large white flowers and a sticky, yellow juice. Common 

 along roadsides and railway tracks of the plains region, seldom extending any distance 

 into the foothills. (One-sixth natural size.) 



fusion of brightly-colored flowers. The climate is very cold, summers 

 are short and winters long. 



In each of the zones named above it is ^possible to recognize a great 

 many special kinds of plant formation depending on soil-moisture, shade 



