WordNet (r) 3.0 (2006):

garden sorrel
    n 1: low perennial with small silvery-green ovate to hastate
         leaves [syn: French sorrel, garden sorrel, Rumex
         scutatus]
    2: European sorrel with large slightly acidic sagittate leaves
       grown throughout north temperate zone for salad and spring
       greens [syn: sour dock, garden sorrel, Rumex acetosa]