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 
