190 



WEEDS OF THE FARM AND GARDEN 



Mountains to the Pacific coast, largely introduced witi. 



clover seed. 



Yellow or Hop-clover (Trifolium agrarium, L.). A 



slender, much-branched annual ; procumbent or erect ; six 



inches to one foot long; stipules broad and pointed; 



leaves obovate or obcordate ; flowers yellow, like the pre- 

 ceding; pod one-seeded. 



Bur Clover or Toothed Medick (Medi- 

 cago hispida, Gaertn.). Nearly smooth 

 annual with long, deep, wiry roots ; 

 spreading or ascending branches and 

 few hairs; after the spring rains it pro- 

 duces an abundance of dense foliage ; 

 leaflets with a notch at the end, crenu- 

 late; dentate stipules; flowers small in 

 little heads, yellow; pods in a loose 

 spiral. Bur clover occurs occasionally 

 in the eastern states, but is most abun- 



dant on the Pacific coast, where it was 

 Fig. 121. Black . . , , j -.i A t 1 

 medick (Medicago earI 7 introduced with other leguminous 



lupulina), a trou- weedy plants. 



Wer Black Medick (Medicago lupulina, L.). 



(Ada Annual with pubescent or somewhat 

 hairy stems spreading on the ground ; 

 small leaflets, either notched at the end or pointed, with 

 stipules, ovate or lanceolate ; flowers yellow in an oblong 

 cylindrical head; pod one-seeded, curved, not spiny, 

 black ; not infrequent in the eastern states. Common in 

 California; considered a valuable plant. 



Common Vetch (Vicia saliva, L.). A smooth or slight- 

 ly hairy annual with simple stem growing from one to 

 two and one-half feet tall ; five to seven pairs of leaflets, 

 obovate-oblong to linear, notched at the tip, sometimes 

 mucronate ; one or two nearly sessile flowers borne in the 

 axils of the leaves, corolla violet-purple ; pod linear, sev- 

 eral seeded; seeds black. Quite generally distributed 



meadows. 

 Hayden.) 



