To see a list of plants referenced in a play, go to the "CANON PLAYS" tab and click on the play. To remove the list, click on the play again.
To see a list of plays that have a reference to a plant, go to the "CANON PLANTS" tab and click on the plant. To remove the list, click on the plant again.
More information about the plants can be obtained from The plant-lore & garden-craft of Shakespeare by Henry Nicholson Ellacombe.