LINN^AN KEY. 



MONANDRIA. 



I. Monogynia. 



1. Acsena. — Calyx lobes valvate. Style ter- 

 minal. Akeiie enclosed in the calyx. 



2. Hippuris. — Calyx superior. Aquatic. 



II. Digyni i, Trigynia and Tetragynia. 



1. Acsena. — Calyx lobes valvate. Akenes 

 enclosed in tlie calyx. Styles of akenes 

 terminal. 



2. Callitriclie. — Fruit a 4-coccous scliizo- 

 carp. Aquatic. 



3. Clienopodium. — Perigonium 3-5-parted. 

 Fruit a utricle enclosed in the persistent 

 perigonium. 



4. Festuca. — Glumaceous. 



5. Cyperus. — Glumaceous, trigynous. 



DIANDRIA. 

 I. Monogynia. 



A. F loral parts incomjMe, inferior. 



1. Salicornia. — Perigonium gamosepalous, 

 opening by a slit and immersed in an ex- 

 cavation of the rachis. 



