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 

 Labiatas. 



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 irregular. 



1. Cruciform (crux, a cross), consisting of four petals spread- 

 ing at right angles to each other. Plants with this corolla con- 

 stitute the large natural order Cracifera3, which corresponds to 

 the 15th class in the artificial arrangement. Of this land 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). 



