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1. L. NITIDUM Nutt. Siliculci shining, gla- 

 brous; petals whitish. — 0. Common. Spring. 



2. L. LATIPES Hook. Silicula strongly re- 

 ticulated; petals greenish. — 0. Marin Coun- 

 ty. Summer. 



5. Capsella Veut. Shepherd's-pukse. 



Silicula clorsally compressed, with carinate, 

 1-nerved valves and narrow replum. Seeds 

 several. Flowers white. — 0. 



1. C. BURSA-PASTORis L. — Common all the 

 year round. 



Ballast weed, introduced from Europe. 

 6. Tropidocarpum Hook. 



Siliqua dorsally compressed, linear, with 1- 

 nerved, carinate valves, and very narrow re- 

 plum. Seeds 00. Flowers yellow. — 



1. T. GRACILE Hook. — Marin county. Sum- 

 mer. 



7. Nasturtium K Br. Water Cress. 



Siliqua linear, with concave valves, and only 

 rudimentary nerve. Seeds oo, 2-seriate in each 

 valve. — Aquatic. 



1. N. OFFICINALE R. Br. Petals white. — 2;. 

 Common all the year round. 



Introduced from Europe, at present perfectly 

 naturalized. 



