VARIOUS FORMS OF COROLLA. * 73 



constitutes the upper part. Its form varies very much : some- 

 times it is rounded^ sometimes acute, sometimes hollow, and at 

 other times its base is prolonged like a spur. Like the calyx, 

 the corolla is sometimes regular, sometimes irregular; sometimes 

 it is cadu'cous; that is, it falls as soon as it is expanded or blown; 

 at other times it fades in the flower before it is detached, and is 

 then said to be marcescent, and we generally distinguish an in- 

 ferior, straight portion, which, in monopetalous flowers, consti- 

 tutes the tube; a superior part which is more or less flaring, 

 called limb, and a circular line which separates the latter from 

 the tube, and bears the name of throat. 



The general form of the corolla varies much ; the following 

 are its principal modifications. 



VARIETIES OF THE COROLLA. 



Corollas are monope'talous, when they are formed of a single 

 petal, and polype'talous, when they consist of several petals. 



MONOPETALOUS COROLLAS are either regular or irregular. 



31. The principal forms of REGULAR MONOPETALOUS COROLLAS, 

 are the following : 



~ ' 



Tabular, when the tube is long, as in the 

 lily. 



Campanulate, or bell-shaped, as in the 

 annexed figure (85). (From the Latin, cam- 

 pana, a bell.) Example: the campanula. 



Fig. 85. -CAMPANULATE. 



Infundibular, or funnel-shaped, as in the flower 

 of the tobacco (fig. 86). 



(Infundibular, from the Latin, infundibulurn, a 

 funnel.) 



Fig. 86. 



INFUNDIBULAR, 



31. What is a tubular corolla? When is it campanulate? When is it 

 infundibular? When is it cyathiform ? What is a hypocrate'rilbrm 

 corolla ? What is a rotate corolla ? What is an urce'olate corolla? What 

 i a scu'tellate corolla ? 

 7 



