140 THE VEGETABLE WORLD. 
and that the pieces of the internal whorl are developed simul- 
taneously. It has been decided from this fact that, in spite of 
appearances, there is 
in the Lily a calyx 
and a corolla; in other 
words, the Lily has a 
petaloid corolla. 
In Rushes, on the 
other hand, contrary 
” to what takes place in 
the Lily, we find a 
sort of double calyx. 
Considerations analo- 
gous to those men- 
tioned have led bota- 
nists to concede to 
these plants a true 
corolla. We must 
admit, then, that in 
_ ® the Lily the calyx is white and petaloid, and in Rushes that the 
corolla is green and sepaloid. 
Let us glance at the principal forms of the corolla when it is 
monopetalous and regular. The six principal forms which the 
corolla assumes need not be otherwise described than by the 
annexed figures and the denominations which indicate them. The 
corolla is infundibuliform, that is, like a funnel, in the Tobacco- 
plant (Fig. 177), tubular in the Comfrey (Fig. 178), campanulate 
or bell-shaped in Bindweed (Fig. 179) and the Campanula, 
hypocrateriform or salver-shaped in the Lilac (Fig. 180) or in the 
Jessamine, rosaceous in Borage (Fig. 181) or in the Willow-herb, 
urceolate or urn-shaped in the Arbutus (Fig. 182). 
When the corolla is monopetalous ‘and irregular, its principal 
_ forms are reduced to three. In the Sage (Fig. 183), or the Dead 
Nettle, &c., the limb of the corolla placed at the summit of a more 
or less elongated tube is divided transversely into two parts called 
lips (/abia) ; the upper lip, presenting two divisions, is formed by 
two petals united almost to the summit; the lower lip, presenting 
three divisions, is formed by three petals joined more or less high 
Fig. 176.—Petaloide corolla of Lilium, 
