periwinkle constituents
 
Periwinkle

   Constituents:

    "Vincin, vincoside, tannins, and at least sixteen alkaloids." 
      Ref.  C p.85, .
    "Also vincamine, flavonoids, pectin, organic acids, several mineral
     salts, vitamin C, rubber, ursolic  acid, flowers have robinoside."
     Ref. D p.281
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