LEGUMINOS^E. 397 



4. Genista Gayana. 



Genista umbellata, Clos, in Gay, Fl. Chil. 2, p. 56, non Poir. 



Hab. High Andes of Chili, ahove Santiago, near the line of per- 

 petual snow. 



Our specimens accord with the character of the Q. umbellata of the 

 Flora Chilena, the name of which must be changed, as it is borne by 

 a much older species ; nor is that name appropriate for a plant which 

 has solitary and sessile flowers. It forms dense tufts, only a few 

 inches high; the stems imbricated throughout with the sheathing 

 bases of the small, trifid, rigid, and spinescent leaves. The pod 

 is ovate-lenticular, about three lines long, very smooth and shining, 

 one-seeded. 



31. ME DIC AGO, Linn. 



1. Medicago sativa, Linn. 



Hab. Kio Negro, North Patagonia: undoubtedly introduced from 

 Europe. 



2. Medicago lupulina, Linn. 



Hab. Chili; between Valparaiso and Santiago: doubtless intro- 

 duced. 



3. Medicago denticulata, Willd. 



Hab. Rio Negro, North Patagonia : introduced with cattle. Now 

 pretty widely diffused through all the temperate regions of the New 

 World that were colonized from the south of Europe. 



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