Mertensia maritima (oysterleaf, sea lungwort, sea bluebell), native to Europe and North America with leaves said to taste like oysters
Pseudopodospermum hispanicum (syn. Scorzonera hispanica, black salsify, black oyster plant), cultivated for its dark-skinned edible root
Acanthus mollis (bear's breeches), native to the Mediterranean
Tragopogon porrifolius (common salsify, vegetable oyster, purple salsify, Jerusalem star), cultivated for its light-skinned edible root
Tradescantia spathacea (formerly Tradescantia discolor) (oyster herb, boatlily, Moses in a basket, cradle lily, Moses in his cradle, Moses on a raft, Moses in the bulrushes, men in a boat, Moses-in-cradle, salsify)