' THE PARTS OF A FLOWER. 239 



Octagynia, eight pistils. 



Enneagynia, nine pistils. 



Decagynia, ten pistils. 



Dodecagynia, from twelve to twenty pistils. 



Polygynia, many pistils. 

 In the 14th class, Didynamia, the orders, which 

 are two, depend upon the seeds being contained in 

 seed-vessels or not. They are called — 



Gymnospermia, when the seeds are naked; and 

 Angiospermia, when they are inclosed in a seed- 



The orders of the 15th class, Tetradynamia, are 

 also two, and are determined by the shape of the 

 seed-vessels or pods : — 



The first has broad short pods, and is called . 

 Siliculosa. 



The second has long pods, and is named, Siliquosa. 



In the 16th, 17th, and 18th classes, the orders are 

 known by the number of stamens. 



The 19th class, Syngenesia, contains 5 orders: — 



1 St. Polygamia Equalis, having all the florets alike. 



2d. Polygamia Superflua, florets of the centre per- 

 fect ; those of the margin having pistils only, but all 

 producing perfect seeds, as in the Daisy. 



.3d. Polygamia Frustranea, florets of the centre 

 perfect, those of the margin neuter; as in the Blue 

 Bottle. 



4th. Polygamia Necessaria, florets of the disk with 



