COROLLA. 



65 



claw being analogous to the petiole, and the lamina to the ex- 

 panded part of the leaf. The structure of petals is like that of 

 leaves, except that the cellular tissue is more delicate, and the 

 iibrous system, or veins, consists of spiral vessels without 

 woody fiber ; they have sometimes breathing pores, or stomata. 

 The lamina (Fig. 72, a) is the upper, and usually the thinner 

 part of the petal ; its margin is sometimes entire^ as in the rose ; 

 sometimes crenate, as in the pink. The claio (Fig. 72, V) is 

 the lower part of the petal, and inserted upon the receptacle ; 

 it is sometimes very short, as in the rose ; in the petal of the 

 pink (Fig. 72) it is long and slender. The limb and tube of 

 monopetalous corollas corresj)ond to the claw and lamina of the 



Fig. 74, Fig. 75. Fig. 76. 



Fig. 72. 



polypetalous. The corolla is superior when inserted above the 

 germ, inferior when below. It is Tegular^ when each division 

 corresponds to the other, as in the rose and pink. When the 

 parts do not correspond with each other, a corolla is irregiclar^ 

 as in the pea and the labiate flowers. 



72. Gamopetalous corollas may, according to their forms, be 

 divided as follows : Bell-form {campamolate) ; here the tube is not 

 distinct, but the corolla gradually spreads from the base. Fig. 

 73 is the representation of a bell-form corolla ; it is monopeta- 

 lous ; the limb {a) is five-parted ; calyx (J), five-parted ; corolla 

 superior : the blue-bell of the gardens oflers a fine illustration 

 of this kind of corolla. Furvnelform^ having a tubular base, 

 and a border opening in the form of a funnel, as the morning- 

 glory (Fig. 74). Gup-sliajped^ diftering from funnel-shaped, in 

 having its tube and border less spreading ; and from bell-form, 

 in not having its tube apj)ear as if scooped out at the base 

 (Fig. 75). Salverform^ from an ancient drinking-glass called 

 a salver / this has a flat, spreading border, proceeding from 

 the top of a tube (Fig. 76). Wheelform^ having a short "border 

 without any tube or with a very short one (Fig. 77) ; this kind 

 of corolla may be seen in the mullein. Labiate^ or lipped (so 

 called from a fancied resemblance to the lips of an animal), 

 consists of two parts ; such corollas are said to be personate^ 

 having the throat closed ; or ringent^ with the throat open, as 

 at Fig. 78 : this kind of corolla resiilts from the imequal co- 



72. Gamopetalous corollas. 



