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c. Floral parts polypetalous, inferior. 

 aa. Floral parts irregular. 



1. Viola. Calyx 5-sepalous. Corolla 5-pet- 

 alous. Capsule 3-valved, placentae 3; 

 each ex-seeded. 



2. JEsculus. Calyx 5-dentate. Corolla 4- 

 5-petalous. Capsule 3-valved, 1-seeded, 

 Tree. 



bb. Floral parts regular. 



1. Acer. Fruit a 2-seeded samara. Trees. 

 Shrubs. 



2. Vitis. Petals coherent at the apex, and 

 caducous at the base, inserted on a disc. 

 Fruit baccate. 



3. Euonymus. Petals 5, inserted on the 

 calyx. Stamens alternating with the 

 petals, inserted on a glandular disc. 

 Fruit capsular. Shrubs. 



4. Ehamnus. Petals 4-5 with short claws, 

 inserted on the calyx. Stamens oppo- 

 site to the petals. Fruit a drupe with 

 several pyrense. Trees. Shrubs. 



5. Ceanothus. Calyx and disc adnate to 

 the base of the ovary. Stamens oppo- 

 site to the petals. Petals with long 

 claws cucullate. Fruit a capsule, 3- 

 celled; cells 1-seeded. Capsule septici- 

 dal. Trees. Shrubs. 



