CALYX AND COROLLA. 



oorolla; * - 



monopetalous corolla, (in 

 which the petals have grown 

 together to form a tube, and 

 are only separate at the top) 

 is shown at a; whilst b 

 shows the separate condition 

 of the petals, which is occa- 

 sionally seen as the conse- 

 quence of a want of adhesion 

 between their edges. Dif- 

 ferent kinds of flowers, too, exhibit every variety, between the 

 completely-separate and the completely-adherent condition of the 

 sepals and petals ; and these differences are often very useful, in 

 distinguishing them from each other. 



457. Outside the calyx, is not unfrequently to be found 

 another whorl of leafy bodies, more resembling in their aspet 

 the ordinary leaves of the plant ; these are called bracts, arid are 

 well seen in the Strawberry, where they surround and alternate 

 with the sepals of the calyx. When no complete circle of them 

 is seen, one or two are often present, and then they are generally 

 larger. They do not always immediately surround the flower,; 

 but are often to be found at the bottom of the flower-stalk. In 



Fig. 92 are shown 

 the Bracts, as they 

 occur in the lame 

 and Hellebore ; in 

 the former case (#) 

 we see the base of 

 the flower -stalk 

 sheathedby a single 

 leaf, which closely 

 resembles the ordi- 

 nary leaf of the 

 plant; in the latter 

 (b) t we see the flower itself enclosed in similar leaves. In Fig. 93 

 the bracts of two umbelliferous * plants are represented ; these 



* By Umbelliferous plants is meant that tribe, in which the flower-stalks 



FIG. 92. 



