BUMBLEBEE-FLOWERS 



linated by bumblebees, are funnel-formed. The gentians bloom 

 at the close of autumn and are very abundant in the Alps, 

 where they display broad expanses of blue color. The closed 



Fig. 4i2. Jewelweed. Impatiens hiflora 

 A bumblebee-flower 



gentian never opens, and on a cold morning the temperature 

 within the corolla-chamber is often several degrees above that 

 of the outside atmosphere. The fringe on the edge of the co- 

 rolla of the fringed gentian prevents the ingress of small injuri- 

 ous insects. (Fig. 43.) 



83 



