FBETILIZATION. 



167 



by hairs, h in IV, or by appendages, A in VI. Those flowers 

 which have one or more sepals or petals prolonged into spurs, 

 like the nasturtium and the columbine, are inaccessible to 

 most insects except those which have a tongue, or a sueking- 



FiG. 149. — BrsmcMng Hairs from the Outside of tlie CoroUa of the Com- 

 mon Mullein (magniiled). 

 dr^ a gland. 



tube long enough to reach to the nectary at the bottom of the 

 spur. The large sphinx moth, shown in Fig. 160, which is a 

 common visitor to the flowers of the evening primrose, is an 



Fig. 150. — A Sphinx Moth, with a Long Sucking-Tuhe. 



example of an insect especially adapted to reach deep into 

 long tubular flowers. 



