CIRCiEA. 



Calyx. Perianthium 1 leaf, superior, deciduous. Tube thread- 

 shaped, very short. Border with 2 divisions, segments 

 sharp, egg-shaped, concave, bent outwards. 



Corolla. Petals 2, inversely heart-shaped, expanding, equal, 

 mostly shorter than the calyx. 



Stamina. Filaments 2, hair-like, upright, as long as the calyx 

 Anthera roundish. 



Pistillum. Germen turban-shaped, beneath. Style thread- 

 shaped, as long as the antherae. Stigma blunt, notched at 

 the end. 



Pertcarpium. Cepsula betwixt egg and turban-shaped, co- 

 vered with strong hairs, with 2 cells and 2 valves, opening 

 from the base upwards. 



Seeds solitary, oblong, narrow towards the base. 

 N. B. Calyx properly 2 leaved. 



LEMNA. 



Flower with Stamina. 



Calyx. 1 leaf, circular, opening at the side, obliquely dila 

 ted outwardly, blunt, expanding, depressed, large, entire. 



Corolla, none. 



Stamina. Filaments 2, awl-shaped, crooked, as long as the 

 calyx. Anthera: double, globular, short, permanent. 



Pistillum. Germen egg-shaped. Style short. Stigm a indis- 

 tinct. 



Pericarpium, barren. 



Flower with a Pistillum on the same plant. 



Calyx, as above. 



Corolla, none. 



Pistillum. Germen somewhat egg-shaped. Style short, per- 

 manent. Stigma simple. 



