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 



