The lily is a flower with a stylized heraldic form. It was the flower of the Virgin Mary and was a symbol of purity and virtue; in period heraldry, though not found as early as the rose, it was second only to the rose in popularity. Lilies are found in the arms of Mayo, 1504 [Parker 371].
Though possibly related in origin to the fleur-de-lys, the two were considered distinctly different charges by the end of period: the grant of arms to Eton College, 1449, has both lilies and a fleur-de-lys, so specified [Hope 67].
Society armory also includes examples of more naturalistic lilies, distinguished in blazon by their breed: e.g., “arum lily” or “tiger lily”. These are drawn as found in nature, but no heraldic difference is granted for them. See also iris, tulip.
Rothin in flamska bears: Or, a lily gules.
Alais Llewella du Bois bears: Per pale argent and vert, two lilies slipped and leaved counterchanged.
Leonora Monadh bears: Vert, three lilies and a bordure Or.
Susannah of York bears: Argent, a lily slipped and leaved purpure.