Synonyms for Oyster Plant (same or very similar meaning)
WordNet sense 1 (edible root of the salsify plant):
salsifyWordNet sense 2 (Mediterranean biennial herb with long-stemmed heads of purple ray flowers and milky sap and long edible root; naturalized throughout United States):
vegetable oyster, Tragopogon porrifoliusFrom the ODE community, based on WordNetadd/edit