(25) 



3. Acaena. Calyx lobes valvate, tube spin- 

 ose. Style terminal. Akene enclosed 

 in the calyx tube. 



4. Negundo. Per igouiuni small, 5-dentate. 

 Fruit a samara. Tree. 



5. Abrouia. Flowers capitulate. Involucre 

 oo-pliyllous. Perigonium gamosepalous, 

 salver-shaped. 



II. Digynia, 



A. Flowers incomplete. 



1. Siueda (Schoberia). Perigonium 5~ 

 parted, not appendlculate. Embryo 

 spiral. 



2. Chenopodium. Perigonium 5-parted, 

 not appendiculate. Embryo annular. 



3. Acrena. Calyx lobes valvate, tube spin- 

 ose. Fruit, 2 akenes, enclosed in the 

 calyx tube. 



B. Floivers complete, gamopetalom; floral parts 



infeiior. 



a. Ovaries 2. Seeds oo. 



1. Apocynum, Ovaries distinct at the 

 base but united by their stigma. Five 

 scales in the tube of the corolla opposite 

 to the corolla lobes. 



2 



