(225) 



11. Brassica L. Mustard. 



Siliqua linear, with concave, more tlian 1- 

 nerved valves. Seeds co, globose, 1-seriate in 

 each valve. Flowers yellow. 



1. B. CAMPESTRis L. Uj)per leaves clasping, 

 auriculate. — ©. Common. Summer. 



Native of Europe, but escaped from cul- 

 tivation and naturalized. 



2. B. NIGRA Boiss. All leaves petioled. — 0. 

 Very common. Summer. 



Black mustard. Probably like the former 

 escaped from cultivation, but at present a trou- 

 blesome weed, plentiful enough to impart a 

 disagreeable taste to milk and honey. 



12. Erysimum L. 

 Siliqua linear, 4-angular, with carinate, 1- 

 nerved valves. Seeds cc, globose, 1-seriate in 

 each valve. Flowers yellow. 



1. E. ASPERUM DC. 0. Common. Sum- 

 mer. 



13. Caulanthus Watsou. 



Sepals equally saccate. Petals undulate. 

 Siliqua elongated, terete, sessile; valves 1- 

 nerved. Seeds oo, oblong, 1-seriate in each 

 valve. 0. 



1. C. PROCERUS Watson. Petals greenish 

 white. Common. Summer. 

 10a 



