( 223 ) 



1. L. NITIDUM Nutt. Silieula 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 Vent. SHEPHERD'S-PUBSE. 



Silicula dorsally compressed, with carinate, 

 1-nerved valves and narrow replum. Seeds 

 several. Flowers white. 0. 



1. C. BUBSA-PASTOBIS 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 oo. Flowers yellow. 



1. T. GBACILE Hook. Marin county. Sum- 

 mer. 



7. Nasturtium R Br. WATER-CRESS. 



Siliqua linear, with concave valves, and only 

 rudimentary nerve. Seeds GO, 2-seriate in each 

 valve. Aquatic. 



1. N. OFFICINALE B. Br. Petals white. 2. 

 Common all the year round. 



Introduced from Europe, at present perfectly 

 naturalized. 



