236 



ORGANOGRAPHY. 



3. Ligulate or strap-shaped. — This is a tubular corolla which 

 is partly split open on one side, so as to become strap -shaped 

 ifigs. 476 and 477). This occurs commonly in the florets of 

 the Composite, either in the whole of those constituting the 

 capitulum, as in the Dandehon ( Leontodon), or only in a part, 

 as in the florets of the ray of Chrysanthemum (^Jig. 477). The 



Fig. 476. 



Fig. 477. 



Fig. 478. 



Fig. 479. 



Fig. 476. Ligulate corolla of a Composite flower Fig. 477. Ligulate 



corolla of Ox-eye (Chrysanthemuvi > Fig. 478. Digitaliform or glove- 

 shaped corolla of Fox-glove (Digitalis purpurea). 



apex of a ligulate corolla has frequently five teeth indicating 



the component petals (y?^. 476). 



Besides the above described forms 

 of regular and irregular monopctalous 

 corollas, others also occur, some of which 

 are but slight modifications of them, and 

 arise from irregularities in certain parts in 

 the ju-ogress of tlieir development. Thus 

 in the Fox-glove (Digitalis) {fig. 478), 

 the general appearance of the corolla is 

 somewhat bell-shaped, but it is longer 

 than that form, and slightly irregular, and 

 has been supposed to reseml)lc tlic finger 

 of a glove ; it lias tlicrefore received the 

 name of digitaliform or glove-shaped. In 

 the Speedwell ( Verotiica) (fig. 479), the 

 corolla is nearly rotate, but the divisions 



Fig. 479. Irregular rotate 

 corolla of ypeedwell 

 t I'^cronica). 



