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11. Brassica L. MostTarp. 
Siliqua linear, with concave, more than 1- 
nerved valves. Seeds o, globose, 1-seriate in 
each valve. Flowers yellow. 
1. B. campestris L. Upper leaves clasping, 
auriculate.-—@©. Common. Summer. 
Native of Europe, but escaped from cul- 
tivation and naturalized. 
2. 3B. nigra Boiss. All leaves petioled.—©. 
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 o, globose, l-seriate in 
each valve. Flowers yellow. 
1. KE, asperum DC. ©@©. Common. Sum- 
mer. 
13, Caulanthus Watson. 
Sepals equally saccate. Petals. undulate. 
Siliqua elongated, terete, sessile; valves 1- 
nerved. Seeds o, oblong, 1-seriate in each 
valve. ©O. 
1. ©. Procerus Watson. Petals greenish 
white. Common. Summer. 
10a 
