SECT. I. THE FLOWER. Qfr 



flat and expanding, as in the Primrose ; or it is 

 twisted, as in the Periwinkle ; or cleft, as in Ana- 

 gallis. If the segments into which the border is 

 cleft are equal, the corolla is said to be regular, as 

 in Solanum tuberosum ; and if they are unequal, 

 it is said to be irregular, as in Echium vulgare. 

 The irregular border is sometimes divided into two 

 principal parts called lips, as was the case also in 

 the calyx, giving origin to the denomination of 

 Labiate flowers. The upper lip is again oftentimes 

 subdivided into two smaller segments, and the 

 under lip into three, as in Verbena officinalis. 



Such is the character of the several parts of the 

 monopetalous corolla taken in detail ; but botanists 

 have found it necessary to attend also to the general 

 outline of the whole, as constituting one indi- 

 vidual organ. The following are the most frequent 

 forms. 



The regular monopetalous corolla is tubular, but Regular. 

 somewhat dilated at the orifice, as in many of the 

 Heaths ; or bell-shaped,, as in Campanula ; or glo- 

 bular, as in the Arbutus ; or club-shaped, as in 

 Erica tubiflora ; or funnel-shaped, as in Pulmo- 

 naria ; or cup-shaped, as in Simphytum offidnale ; 

 or salver-shaped, as in Hottonia ; or wheel-shaped, 

 as in A nag a Ills. 



The irregular monopetalous corolla is difform, Irregular. 

 that is tubular, but expanding towards the summit, 

 and divided into several unequal segments, as in 

 Bluebottle ; or semiflosculous, that is tubular at 



