THE FLOWER — ITS PARTS AND FORMS 139 



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 funnelforrn, 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 Labiate. (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 often- 

 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, or person- Fia ^6. -Personate Flower 



r of Toadflax. 



like). Snap-dragon is a typical 



example; also toadflax or butter-and-eggs (Fig. 186), and 

 many related plants. Personate flowers usually have 

 definite relations to insect pollination. Observe how an 

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

 flax. 



