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 claw, 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 asad ooabe 
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 lim’ or border. “Both of these parts are 
exhibited in the Phlox. { a 
404. Monopetalous corollas are regular when all the parts 
correspond to each other in shape, size, and cohesion; and 
_ trregular 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 (faunnel-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 
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