48 



THE FLOWER. 



into two irregular segments, called the upper and lower lip. If 

 the Ups be widely separate, they are said to be ringent {ringOy 

 to grin). Ex. monkey-flower. If the upper and lower sides are 

 pressed together, j^crsofiate (^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 

 Labiata?. 



FIG. 14. — Forms of corollas ; 1, Campanula rotundifolia ; 2, tobacco ; 3, Convolvulus ; 

 4j Veronica ; 5, sage ; 6, Gaultheria procumbens ; 7, Phlox ; 8, cabbage ; 9, rose ; 10, LalhjTus. 



10-5. Several forms of polypetalons corollas have also re- 

 ceived appropriate names, and are described as follows. The 

 last only is hregular. 



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 Cruciferse, "vvhich corresponds to 

 the l'5th class in the artificial aiTaugement. 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. ii7mceow5, lik« the lily. The Perianth consists of six parts, 

 each gradually bending outwards in such a manner as to resem- 

 ble the campanulate. Ex. lily, tuhp (Fig. 4). 



