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8, Sisymbrium L- HEDGE-MUSTARD. 



Siliqua linear, with concave, 3-nerved valves. 

 Seeds oo, 1-seriate in each valve. 



1. S. OFFICINALE Scop. Branches divari- 

 cate; siliqua closaly appressed to the axis of 

 the raceme; petals yellow. 0. Common all 

 the year round. 



Ballast weed from Europe. 



2. S. ACUTANGULUM DC. Branches ascend- 

 ing; siliqua erect; petals yellow. 0. Mission 

 Dolores. San Jose. Summer. 



Ballast weed, native of the Mediterranean re- 

 gion. 



3. S. EEFLEXUM Nutt. Branches but few; 

 siliqua deflexed; petals yellow, white or red. 

 0. Presidio. Saucelito. Alameda. Summer. 



9, Cakile Tourn. SEA-ROCKET. 

 Fruit a 2-articulate lomentum. 

 1. C. AMERICANA Nutt. Petals rose-colored. 

 0. Berkeley salt marshes. Summer. 



10, Barbarea K. Br. WINTER-CRESS. 



Siliqua linear, 4-augular with concave, 1- 

 nerved valves. Seeds oo, compressed, 1-seriate 

 in each valve. Flowers yellow. 



1. B. VULGABIS B. Br. 2. San Mateo. 

 Summer, 



