48 THE FLOWER. 
into two irregular segments, called the upper and lower lip. If 
the lips be widely separate, they are said to be ringent (ringo, 
to grin). Ex. monkey-flower. If the upper and lower sides are 
pressed together, personate (persona, a mask); Ex. snap dragon. 
If the upper lip is arched, it is termed the helmet or galea. Ex. 
Lamium. This form of the corolla almost universally char- 
acterizes the plants of the large and important natural order 
Labiate. 
FIG: 14.— Forms of corollas; 1, Campanula rotundifolia; 2, tobacco; 3, Convolvulus; 
4, Veronica ; 5; sage ; 6, Gaultheria procumbens ; 7, Phlox ; 8, cabbage ; 9, rose ; 10, Lathyrus. 
105. Several forms of polypetalous corollas have also re- 
ceived appropriate names, and are described as follows. The 
last only is regular. 
1. Cruciform (cruz, a cross), consisting of four petals spread- 
ing at right angles to each other. Plants with this corolla con- 
stitute the large natural order Cruciferee, which corresponds to 
the 15th class in the artificial arrangement. Of this kind is the 
mustard ( Sinapis). 
2. Rosaceous, like the rose. A regular corolla, consisting of 
five or more petals, spreading horizontally, attached to the 
receptacle by very short claws. Ex. rose, apple. 
3. Liliaceous, like the lily. The Perianth consists of six parts, 
each gradually bending outwards in such a manner as to resem- 
ble the campanulate. Ex. lily, tulip (Fig. 4). 
