334 MONOPETALOUS COROLLA. [BOOK i. 



form a sort of spurious monopetalous corolla, as in Malva 

 and Camellia, such a corolla has been occasionally called 

 catapetalous ; but this term is never used, all such corollas 

 being considered polypetalous. 



When the petals are confluent into a monopetalous corolla, 

 they constitute what is called a tube / the orifice of which is 

 the faux or throat. The principal forms of such a corolla 

 are rotate (fig. 94.), hypocrateriform (fig. 92.), infundibu- 

 liform (fig. 95.), campanulate (fig. 96.), and labiate (fig. 93.). 

 When the divisions of a monopetalous corolla do not, as in 

 Campanula, spread regularly round their centre, but part 

 take a direction upwards, and the remainder a direction 

 downwards, as in Labiates, the upper form what is called the 

 upper lip, and the lower, the lower Up, or labellum ; the latter 

 term is chiefly applied to the lower lip of Orchidaceous plants. 

 If the upper lip is arched, as in Lamium album, it is termed 

 the galea or helmet. When the two lips are separated from 

 each other by a wide regular orifice, as in Lamium, the 

 corolla is said to be labiate or ringent ; if the upper and lower 

 sides of the orifice are pressed together, as in Antirrhinum, it 

 is personate or masked, resembling the face of some grinning 

 animal. In the latter the lower side of the orifice is elevated 

 into two longitudinal ridges, divided by a depression corre- 

 sponding to the sinus of the lip ; this part of the orifice is 

 called the palate. In ringent and personate corollas the 

 orifice is sometimes named the rictus; but this term is 

 superfluous and little used. 



A petal consists of the following parts : the limb or lamina ; 

 and the unguis or claw. The claw is the narrow part at the 

 base which takes the place of the foot-stalk of a leaf, of which 

 it is a modification; the limb is the dilated part supported 

 upon the claw, and is a modification of the blade of a leaf. 

 In many petals there is no claw, as in Rosa ; in many it is 

 very long, as in Dianthus. When the claw is present, the 

 petal is said to be unguiculate. In some unnaturally de- 

 formed flowers the limb is absent, as in the garden variety 

 of Rose, called R. (Eillet, in which the petals consist wholly 

 of claw. 



According to the manner in which the petals of a polype- 



