Classes	Characters
12.	Icosandria	Stamens 20 or more, attached to the calyx
13.	Polyandria	Stamens 20 or more, attached to the receptacle
14.	Didynamia	Stamens didynamous
15.	Tetradynamia	Stamens tetradynamous
16.	Monadelphia	Stamens united in a bundle
17.	Diadelphia	Stamens united in two bundles
18.	Polyadelphia	Stamens united in more than two bundles
19.	Syngenesia	Stamens united by anthers
20.	Gyandria	Stamens adnate to the carpels
21.	Monoecia	Plants monoecious
22.	Dioecia	Plants dioecious
23.	Polygamia	Plants polygamous
24.	Cryptogamia	Plants with concealed flower