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5. Actea.—Calyx 4-sepalous. Anthers ad- 
nate, introrse. Ovary 1. Placenta ven- 
tral. Style 0. Berry o-seeded. 
B. Petals 5. 
1. UHelianthemum.—Calyx double. Exter- 
nal sepals 2, sometimes 0; internal 3,con- 
torted in wstivation. Capsule 3-valved. 
C. Petals 6. 
1. Argemone.—Calyx 38-sepalous. Fila- 
ments filiform. Stigmas radiate. 
2. Platystemon.—Calyx 3-sepalous. Fila- 
ments flattened their entire length, 
ovary at last separating into its com- 
ponent carpidia. 
3. Platystigma.—Calyx 3-sepalous. Fila- 
ments flattened only at the base, ovary 
not separating but ripening into a 3- 
valved capsule. 
II. Di-, Tri-, Tetra-, Penta-, Polygnia, 
A. Ovaries ventrally dehiscent. Fruit a follicle. 
a. Flowers irregular. 
1. Delphinium. Calyx petaloid. Superior 
sepal calcarate. 
b. Flowers regular. 
1. Platystemon.—Sepals 3, caducous. Pet- 
als 6. Filaments flattened. Carpidia at 
first united into an oo-celled ovary. 
