30 ORDERS. 



In the second, Icosandria, twenty or more sta- 

 mens, tlieir filaments inserted 

 by sets in the calyx. 



In the third, Polyatidria, the stamens are 



numerous, and unconnected 

 with the calyx. 



The five orders of the nineteenth class, (Syngenesia) 

 are characterized by the structure of ihe flowers. 



Order 1. Polygamia cEqualis, every floret having 

 stamens and pistils, as in Succory, 

 (Cichorium) fig. 1, pi. 22. 



2. Polygamia superflua, florets of the disk 



or centre, having stamens and pistils, 

 those of the circumference furnished 

 with a pistil only, as in the Daisy, 

 (Bellis) fig. 2. 



3. Polygameafrustranea, florets of the disk 



having stamens and pistils, those of the 

 circumference neither, as in Knapweed, 

 (Centaurea) fig. 3. 



4. Polygamia 7iecessaria, florets of the disk 



with stamens only, those of the radius 

 with a pistil only, as in Marygold. 



5. Polygamia segregata, resembles Polyga- 



mia Eequalis, except that each floret 

 has its proper calyx, and all the florets 

 collectively a common calyx, as in the 

 Globe thistle, fig. 4. 



