LINNEAN CLASSES AND ORDERS. 43 



3. Trigynia : Mignonette, (Reseda.) 



4. Tetragynia. ^ 



5. Pentagynia.^ 



6. Dodecagynia is exemplified in the House-leek, 



(Sempervivum.) 



TWELFTH CLASS.— IcosANDRiA. 



Stamens 20 or more, proceeding from the Calyx. 

 Flowers united. Orders 5.* 



Monogynia. Digynia. Trigynia. Pentagynia. 

 Polygynia. 



\. Monygynia : ex. Cherry, (Prunus.) 



2. Digynia : ex. Hawthorn, (Crataegus.) 



3. Trigynia : ex. Mountain-ash, (Sorbus.) 



4. Pentagynia : ex. Spiraea. 



5. Polygynia : ex. Bramble, (Rubus) Strawberry, 



(Fragraria) and Avens, (Geum.) 



• All the plants in this class belong to the natural order Rosaccce. 



