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3. Acawna.—Calyx lobes valvate, tube spin- 
ose. Style terminal. Akene enclosed 
in the calyx tube. 
4. Negundo.—Perigonium small, 5-dentate. 
Fruit a samara. Tree. 
5. Abronia.—Flowers capitulate. Involucre 
o-phyllous. Perigonium gamosepalous, 
salver-shaped. 
Il. Digynia. 
A. Flowers incomplete. 
1. Suda (Schoberia). —Perigonium 65- 
parted, not appendiculate. Embryo 
spiral. 
2. Chenopedium.— Perigonium 5-parted, 
not appendiculate. Lmbryo annular. 
3. Acena.—Calyx lobes valvate, tube spin- 
ose. Fruit, 2 akenes, enclosed in the 
calyx tube. 
B. Flowers complete, gamopetalous; floral parts 
inferior. 
a. Ovaries 2. Seeds ow. 
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 
