144 



PARTICULAR FORMS OF FLOWERS 



242. Rotate flowers of potato. 



carpels may follow the rule. Flowers on 

 the plan of 5 are said to be pentamerous; 

 those on the plan of 3 are trimerous 

 (merous is from Greek, signifying "mem- 

 ber"). In descriptive botanies 

 these words are often written 

 5-merous and 3-merous. 



292. The corolla often as- 

 sumes very definite or distinct 

 forms when gamopetalous. It 

 may have a long tube with a 

 wide-flaring limb, when it is 

 said to be funnelform, as in 



morning-glory (Fig. 240) and pumpkin. If the tube is 



very narrow and the limb stands at right angles to it, the 



corolla is salverform, as in phlox. (Fig. 241.) If the tube is 



very short and the limb wide-spreading and 



nearly circular in outline, the corolla is rotate 



or wheel-shaped, as in potato. (Fig. 242.) 

 293. A gamopetalous corolla or gamo- 



sepalous calyx is often cleft in such way as to 



make two prominent parts. Such parts are 



said to be lipped or labiate. Each of the lips 



or lobes may be notched or toothed. In 5- 



merous flowers, the lower lip is usually 3-lobed 



and the upper one 2-lobed. Labiate flowers 



are characteristic of the mint family (Fig. 



213), and the family therefore is called the 



Labiatse. (Properly, labiate means merely 



lipped, without specifying the number of lips 



or lobes; but it is commonly used to designate 



2-lipped flowers.) Strongly 2-parted poly- 



petalous flowers may be said to be labiate; 



but the term is oftenest used for gamopeta- 

 lous corollas. 



243. 



Personate flowers 

 of snapdragon. 



