XI. Dodecandria: stamens from twelve to twenty; as in agrimony.
XII. Icosandria: twenty or more stamens, inserted upon the inner side of the calyx; as in the rose and apple.
XIII. Polyandria: twenty or more stamens, inserted upon the receptacle or point of union of all the parts of the flower; as in the crowfoot and anemone.
The relative length of the stamens determines the next two classes.
XIV. Didynamia: four-stamens, of which two are shorter; as in thyme and foxglove.
XV. Tetradynamia: six stamens, of which two are shorter; as in cabbage and wallflower.
Three classes are indicated by having the stamina connected by their filaments.
XVI. Monadelphia: stamens united by their filaments into a single body or set; as in mallows.
XVII. Diadelphia: stamens united into two distinct sets; as in fumitory.
XVIII. Polyadelphia: stamens united into three or more bundles; as in hypericum and cistus.