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 

 Labiatse. 



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 Craciferae, 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). 



