LINN^AN KEY. 



MONANDRIA, 



I. Monogynia, 



1. Acsena. Calyx lobes valvate. Style ter- 

 minal. Akene enclosed in the calyx. 



2. Hippuris. Calyx superior. Aquatic. 



n, Digyni % Trigynia and Tetragynia, 



1. Acaena. Calyx lobes valvate. Akenes 

 enclosed in the calyx. Styles of akenes 

 terminal. 



2. Callitriche. Fruit a 4-coccous schizo- 

 carp. Aquatic. 



3. Chenopodium. Perigonium 3-5-parted. 

 Fruit a utricle enclosed in the persistent 

 perigonium. 



4. Festuca. Glumaceous. 



5. Cyperus. Glumaceous, trigynous. 



DIANDRIA. 

 I, Monogynia, 

 A. Floral parts incomplete, inferior. 



1. Salicornia. Perigonium gamosepalous, 

 opening by a slit and immersed in an ex- 

 cavation of the rachis. 



