Cowslip (Primula veris):

Venus. Cattle were once adorned with cowslips to encourage healthy milk production. Cowslip flowers were believed to bring luck in love to the wearer. In Suffolk, milkmaids would wash their faces in milk in which cowslip petals had been infused on Beltane, believing that it would make their faces glow and attract their beloved during the Beltane celebrations. Were traditionally woven into funeral wreaths to be laid on the deceased one’s grave at the full moon, for thirteen moons after his or her death. Posies of cowslips, placed under the pillow, were said to allow contact with the dead in dreams.