OTHER CLOVERS 



417 



and is irrigated about every twelve days. According 



to Friiwirth the annual yield of hay in Italy is 7000 to 



10,500 pounds to an acre. It is 



usually sown with wheat, and the 



fields are maintained from 2 to 7 



years. 



This variety is considerably 

 less cold-resistant than ordinary 

 white clover, and was badly in- 

 jured by winter cold in Swiss 

 trials when ordinary white clover 

 was uninjured. 



SWEET CLOVER (Melilotus alba) 



499. Botany and description. 

 Sweet clover (Fig. 46) is also 

 known by many other names, 

 among them Bokhara clover, 

 melilot, white melilot, sweet 

 melilot, Siberian melilot, bee 

 clover, honey clover and galy- 

 gumber. In the South it is now 

 commonly called melilotus. It is 

 native to temperate Europe and 

 Asia as far east as Tibet, but is 

 now spread over much of the 

 United States and Canada, and 

 also in the south temperate zone 



of both hemispheres. Several varieties have been de- 

 scribed by botanists. 



Sweet clover is biennial in duration. The seedlings 

 appear in early spring under natural conditions and grow 

 2 E 



FIG. 46. Sweet clover. 



