( -25) 



3. Acneua. — Calyx lobes valvate, tube spin- 

 036. Sh'le terminal. Akene enclosed 

 in the calyx tube. 



4. Negundo. — Perigonium small, 5-dentate, 

 Fruit a samara. Tree. 



5. Abronia. — Flowers capitulate. Involucre 

 oo-pliyllous. Perigonium gamosepalous, 

 sal ver-sli aped. 



n. Digynia. 



A. Flowers incomplete. 



1. Suieda (Sclioberia). — Perigonium 5- 

 parted, not appendiculate. Embryo 

 spiral. 



2. Chenopodium. — Perigonium 5-parted, 

 not appendiculate. Embryo annular. 



3. xlcasna. — Calyx lobes valvate, tube spin- 

 ose. Fruit, 2 akenes, enclosed in the 

 calyx tube. 



B. Flowers complete, gamopetalons; floral parts 



inferior. 



a. Ovaries £. Seeds ac. 



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 



