THE FLORAL ENVELOPES. 

 Fig. 39. Fig. 40. 



133 



little notch at its summit proves; the lower, of three. "When the 

 two lips are thus gaping and the throat open, the corolla is 

 said to be ringent, as in Lamium amplexicaule ; but when the 

 mouth is closed by the approximation of the two lips, by an 

 elevated protuberance of the lower called the palate, as in the 

 snap-dragon or toad-flax b, the corolla is designated as per- 

 sonate or masked. When a tubular corolla is split down on 

 one side in such a way as to form a strap-shaped process with 

 several tooth-like projections at its apex, it becomes ligulafe 

 {ligula, a little tongue,) or strap-shaped. (Fig. 40, d.) This 

 kind of corolla is well seen in composite flowers such as the 

 dandelion, in which all the flowers forming the head are 

 ligulate. In the Compositse there are often two kinds of florets 

 associated in the same head. Thus the outer florets which form 

 the white ray of the Ox-eye daisy (Leucanthemum) are ligulate, 

 whilst those which form the yellow disk are tubular, (c.) 



The largest flower in the world is the Kafflesia Arnoldii, 

 (Fig. 41,) which was discovered by Sir Thomas Stamford 



12* 



