MISCELLANEOUS PLANTS. 237 



of pasture plants. On the coast of the Atlantic 

 there should be a place for this plant, and also on the 

 coast of the Pacific. But when it is to be used as a 

 spring pasture, it can only be grown in mild lati- 

 tudes. It should certainly be given careful experi- 

 mentation in the areas referred to. 



MUSTARD. 



The only species of mustard that have been 

 extensively grown as field crops are known as black 

 and white mustard, respectively. Black mustard 

 (Brassica nigra) is known also as brown or red 

 mustard. Formerly it was extensively grown for 

 the seed in Great Britain and certain other countries 

 of the continent of Europe, and in some localities it 

 is still looked upon as a valuable crop. It has been 

 objected to as a regular rotation crop, first, because 

 of its exhaustiveness on the land; second, because 

 of the liability to damage through discoloration of 

 the seed, as by rain when it is being harvested, and, 

 third, from the danger that plants from the seed will 

 spring up and make trouble in succeeding crops. 



White mustard (Brassica alba) is distinguished 

 from the black by its stems being covered with rough 

 leaves and by the pods terminating in a broad two- 

 edged beak. The seeds are of a pale yellow color. 

 This kind is also frequently grown for the seed. 

 A good crop in Great Britain yields from thirty 

 to forty bushels per acre. It is sometimes grown 

 for being plowed under. It is excellent for such a 

 use because of its rapid growth and bulky character, 

 because of the large proportion of the food which it 

 gathers from the air, and because of the ameliorating 



