400 SYSTEMATIC BOTANY. 



Class 5. Pentandria, those with five stamens, as the Cowslip, 

 Nightshade, and Vine. (Fig. 504.) This is a very 

 extensive class. 



Class 6. Hexandria, those with six stamens, as the Lily Order 

 of the Natural System. (Fig. 508.) 



Class 7. Heptandria, those with seven stamens, as the Horse- 

 chestnut {fig. 891), and Trientalis. 



Class 8. Octandria, those with eight stamens, as the Heath, 

 Ivy, and Eue. {Fig. 564.) 



Class 9. Etmeandria, those with nine stamens, as the Flowering 

 Eush {fig. 576), and Khubarb. 



Class 10. Decandria, those with ten stamens, as the Pink, and 

 Sediojn. {Fig. 767.) 



Class 1 1 . Dodecandria. This class includes all plants possessing 

 the characters above described, which have flowers 

 containing from twelve to nineteen stamens, as the 

 Asarabacca, and Mignonette. 



The two succeeding classes include plants with hermaphrodite 

 flowers, having twenty or more unconnected stamens, which 

 vary as to their mode of insertion ; but the names of the classes 

 are not here exactly descriptive. Thus: — 



Class 12. Icosandria, (literally twenty stamens). This includes 

 all plants which have twenty or more stamens to the 

 flower, and inserted on the calyx or 'perigynous, as 

 in the Rose Order. {Fig. 530.) 



Class 13. Polyandria, (literally many stamens), those which have 

 twenty or more stamens inserted on the thalamus — 

 that is hypogynous ; as in the Buttercup {figs. 843 

 and 844), Poppy, and Anemone. 



The characters of the two succeeding classes depend upon the 

 relative length of the stamens, the flowers being also herma- 

 phrodite; thus: — 



Class 14. Didynamia, includes plants with four stamens to the 

 flower, two of which are long and two short, — or, in 

 other words, didyjiamous, as in the Poxglove {fig. 

 545), and Dead-nettle. 



Class 15. Tctr adynamia, includes plants with six stamens, o'^ 

 which four are long and two short — or, in other 

 words, tetradynamous; as in the Wallflower and 

 Cruciferous Plants generally. {Fig. 544.) This 

 class corresponds to the natural order Cruciferse, 



The names of the two latter classes are derived from the 

 Greek, and signify in the former class that the two longer, and 

 in the latter that the four longer stamens, are more powerful 

 than the shorter. 



