. XII.] 



THE COROLLA. 



69 



may sometimes find a difficulty in determining whether tho co- 

 rolla is in one piece or more ; for monopetalous flowers often have 

 deep divisions, extending almost to the base of the corolla; but 

 a corolla must be divided at the base, or be in separate pieces, 

 in order to be considered as polypetalous. It is a good rule to 

 consider the parts into which a corolla naturally falls, as so 

 many petals, 



277. Monopetalous corollas (see Fig. 44,) consists of the tube, 

 throat, and limb. The tube, is the lower part, having more or 

 less the form of a tunnel. The throat is the entrance into the 

 tube ; it is either open, or closed by scales or hairs. The liinb 

 is the upper border of the corolla. 



Fig. 43. 278. Polypetalous corollas consist of 



several petals. Each petal consists of 

 two parts, the lamina and claw. 



279. The lamina, (Fig. 43, a) is the 

 upper and usually thinner part of the pe- 

 tal ; its margin is sometimes entire, or 

 without divisions, as in the Rose ; some- 

 times notched, or crenate, as in the Pink. 

 The lamina corresponds to the limb of 

 monopetalous corollas. 



280. The claw (Fig. 43, &,) is the lower 

 part of the petal, and inserted upon the 

 receptacle ; it is sometimes very short as 

 in the Rose ; in the Pink, as seen at Fig. 

 43, it is long and slender. The claw is 



analogous to the tube of monopetalous corollas. 



281. The corolla is superior when it is inserted above the 

 germ ; inferior, when below. It is regular when each divi- 

 sion corresponds to ihe other. The Rose and Pink have regular 

 corollas. When the part? do not correspond with each other, a 

 corolla is irregular, as in the Pea and Violet. 



Different forms of Monopetalous Corollas. 



Monupetalous corollas may, according to their forms, be di- 

 vided as follows ; 



277. What are the parts of a monopetalous corolla 1 



278. What are the parts of a polypetalous corolla 1 



279. What is the lamina 1 

 230. What is the claw'? 



281. What is meant by the terms inferior and superior, regulai 

 and irregular, when applied to the corolla 1 



