 He points to a connection between Persephone, who might have been gathering Daffodils (confused with the Asphodel in English tradition), before being taken under the Earth by Pluto.When Persephone was captured, the Daffodils, originally white in colour, turned yellow.So, the 'shrouded in snow' phrase may refer to the "coldness and frigidity of the situation in which she is trapped"; to the white flowers that covered her head as she was being dragged off; to the covering of snow on the ground during Winter prior to the re-appearance of the flowers.