482 STRUCTURE AND LIFE HISTORIES 



on the tube of the irregular, two-lipped corolla, which 

 bears a well-developed spur at the base*^(Fig. 367). Not 

 infrequently abnormal flowers are found with five spurs, 



Fig. 366. — The toad-flax, or butter-and-eggs (Linaria vulgaris). 



or with none, and other attendant modifications of the 

 corolla (Figs. 368 and 369). -Such flowers are called 

 pelories, since they are thought to be variations indicating 

 the character of the ancestral form from which they are 



