190 



WEED FLORA OF IOWA 



Si 



Water 



Ash 



Ether extract 



Crude fiber 



Crude protein 



Nitrogen free extract 



10.18 

 2.S2 

 23.16 

 19.16 

 44.99 



Black Medio {Medicago lupulinaJj.). 



Description. — ^A proeumbent, pubescent, annual; compound 

 leaves trifoliate; leaflets wedge-shaped, obovate, toothed at the apex; 

 flowers yellow, in short spikes ; pods kidney-form, 1-seeded. 



Distribuiion. — ^Native from Europe, common in alfalfa fields in 

 the Rocky mountains and on the Pacific coast; common in waste 

 places in eastern North America; reported from a number of coun- 

 ties in Iowa, as "Wright, Kossuth and Story. 



Extermination. — This annual is not difficult to exterminate by 

 giving thorough cultivation ; care should be used in planting clover 

 and alfalfa seed, because this weed seed is a common impurity of 

 the latter. The seed also retains its vitality for some time. 



Chemical Composition.* 



FRESH OB AIR DRY MATERIAL,. 



•Compiled by Jenkins and Winton, Bull. Off. Exp. Sta., Bull. 11. 



