Oh. XH.J . TE COROLLA. 69 



may sometimes find a difficulty in determining whether thr co- 

 rolla is in one piece or more; tor monopetaious flowers often have 

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

 i corolla mu^t be divided at the base, or be in separate pieces, 

 n order to he considered as poiypelalous. It is a good rule to 

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

 many petals 



277. Munopetalous coroUas (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 Unit* 

 is the upper border of the -corolla. 



Fig. 43. 278. Pvlypetalous corollas consist of 



several petals. Each petal consists ot 

 two parts, the lamina and claw. 



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

 upper and usually thinner part of the pt- 

 tal ; its margin is sometimes entire, of 

 without di visions, 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, b.) is theiower 

 part of the petal, and inserted upon f he 

 receptacle ; it is sometimes very short as 

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

 43, it is long and slender. The claw is 



analogous to the tube of monopetalous corollas. 



281. The corolla is superior when it is i*isertd above the 

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

 Fion corresponds to ihe other. The Rose and Pink have regulai 

 corollas. When die parts do not correspond with each, other, a 

 corolla -is irregular , as in the Pea and Violet. 



Different forms of Monopetalous Corollas. 



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

 vided as folio w-s; 



277. Wbutare the parts of a monopeta!ous corolla? 



278. What are the parts of a polypeialous corolla? 



279. What is the lamina 1 

 2HO. What is the claw 1 



981. What is meant by the terras inferior and superior, 

 ai irfggujar, wbo applied to ih-ecor&lla t 



