MONOPETALOUS COROLLAS. 47 



crown. It is fitly applied to that whorl of the floral envelopes 

 situated between the calyx and the stamens, upon the delicate 

 texture and hues of which chiefly depend the beauty of the 

 flower. 



101. The divisions of the corolla are called petals. Like the 

 sepals of the calyx, they are either distinct, or united by their 

 adjacent edges to a greater or less extent, as in the morning 

 glory. When they are distinct, the corolla is said to be polypet- 

 alous ; otherwise, monopetalous, a term which is as greatly mis- 

 applied in this case as monosepalous is to the calyx, since no true 

 corolla can consist simply of a single petal. 



102. A petal consists of two parts ; the daw, which is the 

 narrow part at the base, answering to the stalk of a leaf, and 

 the lamina, which is the expanded portion supported by the 

 claw, and answers to the blade of the leaf. The claw is some- 

 times very long, as in the pink, and often is wanting, as in the 

 rose. 



103. When the petals are confluent into a monopetalous 

 corolla, the united claws form that part of it which is called the 

 tube, and the lamina constitute the upper, expanded portion of 

 it, which is called the limb or border. Both of these parts are 

 exhibited in the Phlox. 



104. Monopetalous corollas are regular when all the parts 

 correspond to each other in shape, size, and cohesion; and 

 irregular when they do not. Both these kinds assume various 

 forms (Fig. 14), which have received appropriate names, as 

 follows : 



1. Campanulate (bell-shaped), having the tube wide, and 

 swelling abruptly at the base, as in the bell-flower (Cam- 

 panula). 



2. Infundibuliform (funnel-form), tubular at the base, but 

 gradually enlarging towards the border. Ex. morning glory, 

 tobacco. 



3. Hypocrateriform (salver- form), the tube ending abruptly in 

 a border spreading horizontally. Ex. Phlox. 



4. Rotate (wheel-form), limb regular, or nearly so, spreading, 

 with a very short or imperceptible tube. Ex. mullein. 



5. Labiate (lipped). This corolla has its limb deeply cleft 



5 



