KEY TO THE ORDERS 9 



Filaments free. Tiliacese. 



Filaments monadelplious. Sterculiaceae. 



Series II. Discifloral, Flowers usually bisexual and regular; calyx 

 inferior, petals distinct or connate at the very base, with usually a perigynous 

 or hypogyuous disk or row of glands between their insertion and the ovary. 

 Stamens inserted on or at the inner or outer base of the disk, or between 

 the glands, or on the petals. 

 Flowers regular. 



Fruits of separate carpels. 



Leaves gland-dotted. Rutacero. 



Leaves not gland-dotted. 

 Leaves opposite. 



Leaves pinnate Zygophyllacera. 



Leaves simple. Ooriariere. 



Leaves alternate, exstipnlate, compound. 



Stamens inserted chiefly outside the disk. 



Simarubese. 

 Stamens inserted chiefly inside the disk. 



S a p i n dace ne. 

 Fruits syncarpous. 



Herbs. 



Terrestrial. 



Leaves stipulate, stamens many. 



Tiliacepe. 



Leaves stipulate. Geraniacese. 



Leaves exstipnlate. Line re (Linum). 



Aquatic herbs, disk adnate to the ovary. 



Whole plant floating. Onagrariese (Trapci). 



Leaves and flowers only floating. 



NymphseaceaB. 

 Trees or shrubs. 



Stamens 5 or fewer, opposite or on the petals. 

 Leaves simple. 



