78 M)MK.NCI. \TURE OF THE FI.oM | 



OF THE COROLLA. 



19. Corollas differ from several circumstances, but 

 principally in the number and division of their petals, 

 their equality, figure, margin, proportion, duration and 

 colour. 



20. Petals: According to the number of its petals, 

 the corolla is either monopetalous, dipetalous, tripetalous, 

 or polypetalous. 



a. Monopetalous consisting of only one petal, as in the convol- 

 vulus, tobacco, thorn-apple, and many others. The lower part 

 (F. 10, g.) of a monopetalous corolla, is called the tube; and the 

 border, c c, or upper part, the limb. 



b. Dipetalous consisting of two petals, as in the enchanter's 

 night shade. 



c. Tripetalons-consisting of three petals, as in sagittaria. 



d. Polypetalous when there are more than three petals, as in 

 the marsh-marygold, lily, tulip and others. The lower part of a 

 polypetalons corolla, (F. 3, a), is called the unguis, or claw ; and the 

 upper spreading part, (b,) the border. 



21. Dicinions: With regard to the divisions of the 

 petals of a corolla, they may be bifid or two- cleft, trifid 

 or three-cleft, and many-cleft; or they may be bipartite, 

 tripartite, or laciniated. 



a. Bifid or two-cleft when each petal is divided into two, as in 

 duckweed and enchanter's night-shade. 



b. Trifid or three-cleft when each petal is divided into three 

 parts. 



c. Many-cleft when each petal is divided into mrre than three 

 pnrts : thus, the petals of the common ragged-robin have four clefts, 

 those of the primrose five clefts, and those of the winter-green 



