(224) 



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; siliqaa closdly appressed to the axis of 

 the raceme; petals yellow. — 0. Common all 

 the year round. 



Ballast weed from Europe. 



2. S. ACUTANGULUM DO. Branches ascend- 

 iug; siliqua erect; petals yellow. — 0. Mission 

 Dolores. San Jose. Summer. 



Ballast weed, native of the Mediterranean re- 

 gion. 



3. S. REFLEXUM Nutt. Branches but few; 

 siliqua deflexed; petals yellow, white or red. — 

 0. Presidio. Saucelito. xllameda. Summer. 



9. Cakile Tomu. Sea-Rocket. 

 Fruit a 2-articulate lomentum. 

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

 0. Berkeley salt marshes. Summer. 



10. Barbarea K- Er. Winter-Ckess. 



Siliqua linear, 4-angular with concave, 1- 

 nerved valves. Seeds oo, compressed, 1-seriate 

 in each valve. Flowers yellow. 



1. B. VULGARIS R. Br. — U- San Mateo. 

 Summer. 



