THE FLOWER — ITS PARTS AND FORMS 1 39 



Various Forms of Corolla. — The corolla often assumes 

 very definite or distinct forms, especially when gamopet- 

 alous. It may have a long tube with a wide-flaring limb, 

 when it is said to be funnelform, as in morning-glory 

 and pumpkin. If the tube is very narrow and the limb 

 stands at right angles to it, the corolla is salverform, as 

 in phlox. 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. 



A gamopetalous corolla or gamosepalous 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-membered flowers, 

 the lower lip is usually 3-lobed and the upper one 2-lobed. 

 Labiate flowers are characteristic of the mint family (Fig. 

 185), and the family therefore is called the Labiatae. (Lit- 

 erally, labiate means merely "lipped," without specifying the 

 number of lips or lobes ; but it is commonly used to desig- 

 nate 2-lipped flowers.) Strongly 2-parted polypetalous 

 flowers may be said to be labiate ; but the term is of ten- 

 est used for gamopetalous co- 

 rollas. 



Labiate gamopetalous flowers 

 that are closed in the throat (or 

 entrance to the tube) are said to 

 be grinning or personate (per- 

 sonate means masked). Snap- Fig. 186. -Personate flower 



' ^ OF rOAUFLAX. 



dragon is a typical example; 



also "^-oadflax or butter-and-eggs (Fig. 186), and many 

 related plants. Personate flowers usually have defin- 

 ite relations to insect pollination. Observe how an 

 insect forces his head into the closed throat of the toad- 

 fax. 



