OEGAKS OF SEPBODUCTION. 229 



Fig. 474. Fig. 475, Fig. 476. 



AA ^M\ 



Fig. 474. Lierulate corolla of a Composite flower. Fig. 475. Ligulate 



corolla of Ox-eye (Chrysanthemum). Fig. 476. Digitaliform or glove- 

 shaped corolla of Fox-glove {,Digitalis purpurea . 



Besides the above-described forms of Fig. 477. 



regular and irregular monopetalous corol- 

 las, others also occur, some of which are 

 but slight modifications of them, arising 

 from irregularities being produced in cer- 

 tain parts in the progress of their develop- 

 ment. Thus in the Fox-glove {Digitalis) 

 (Jig. 476), the general appearance of the 

 corolla is somewhat bell-shaped, but it is 

 longer than this form, and slightly ir- 

 regular, and has been supposed to resem- 

 ble the finger of a glove ; it has therefore 

 received the name of digitaliforra ov glove- ^ig_ 477. irregular rotate 

 shaped. In the Speedwell (Vero?iica) {Jig . '^y^J^^^^^^^f SpeedweU 

 477). the corolla is nearly rotate, but the ' ^'''^"*'^" • 

 divisions are of unequal size ; in the Eed Valerian {Centranthus), 

 the corolla is irregularly salver-shaped {Jig. 479) ; and some other 

 unimportant irregularities may be also found in the corollas of 

 other plants, but these require no special notice. 



ANOMALOUS Forms, and Appe>t)ages of Petals. — The 

 corolla, like the calyx, whether polypetalous or monopetalous, is 

 subject to various irregularities, arising from the expansion or 



