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TETRADYNAMIA. 
I. Siliculosa. 
A. Fruit a 2-articulate lomentum. 
1. Cakile.—Both articles of the lomentum 
anceps. 
B. Fruit a schizocarp. 
1. Senebiera.—Silicula 2-seeded, margin 
not winged. 
C. Fruit an indehiscent silicula. 
1” Thysanocarpus.—Silicula 1-seeded, mar- 
gin winged. 
D. Silicula regularly dehiscent, dorsally com- 
pressed, septum narrow. 
1. Lepidium.—Cells 1-seeded. 
2. Capsella.—Cells oo-seeded. 
E. Silicula regularly dehiscent, laterally com- 
pressed, septum broad. 
1. Alyssum.—Cells 1-4-ovulate. 
IL Siliquosa. 
A. Siliqua indehiscent. 
1. Raphanus.—Siliqua moniliform. 
B. Siliqua regularly dehiscent. 
1. Cardamine.—Siliqua laterally com- 
pressed. Valves linear’ without nerves. 
Ovules in each cell o, 1-seriate. 
