30 AN INTRODUCTION 



CHAP. XVII. 



OF THE DIFFERENT STRUCTURES OF THE 



RECEFTACLE. 



IT is in the class Syngenesia, which contains the 

 compound flowers, that the varieties of the Recep- 

 tacle are principally to be considered. 



In respect to its FIGURE, it is either, plane, flat, 

 as inAchillea; convex, rounding, as in Matricaria; 

 or conic, shaped like a cone, as in Anthemis and 

 Melampodium. 



In respect to its SURFACE, it is either naked, as in 

 Matricaria ; punctate, dotted, as in Tragopogon ; 

 yillose, shaggy, as in Andryala ; setose, bristly, as in 

 Centaurea ; or paleaceous, chaffy, as in Hypochaeris 

 and Anthemis. 



In some simple flowers, the fruit has separate Re- 

 ceptacles, as in Magnolia, Uvaria and Michelia. 



CHAP. XVIII. 



OF THE SINGULARITIES IN THE STUCTURES OF 

 THE PARTS OF FRUCTIFICATION. 



BY a singular structure of the parts of Fructifica- 

 tion, is to be understood such a one as is observed 

 but in very fev." Genera ; it is directly opposed to 

 the natural structure explained in Chap. 10. For 

 instances of this we may mention the Arum, whose 

 stamina are within the pistilla ; the Adoxa, whose 

 germen separates the corolla from the calyx ; the 

 Salvia, whose filaments are articulate, jointed ; the 

 Eriocaulon, whose stamina are placed on the germen, 

 and whose corolla and calyx are below the sermen ; 



