[437-5] A corollary here means more than enough.
[437-6] Pertly means alertly.
[437-7] Iris was the fleet messenger of the Greek gods. She had beautiful golden wings, and as she flew across the heavens, she left the many-colored rainbow as her trail.
[437-8] Ceres was the Greek goddess of the earth, who especially watched over the growth of grain and fruits. She it is who brings rich harvests, or when her attention is called away, permits drought to kill the vegetation.
[438-9] Stover is fodder. A mead thatched with stover is a meadow covered with rich grass and hay.
[438-10] The common marsh-marigold was called peony in some localities.
[438-11] Reeds were called twills in some localities.
[438-12] The frequent rains of April make the ground like a water-soaked sponge.
[438-13] This passage means: “Thy banks with edges bordered with marsh-marigolds and reeds which rainy April trims to make cold crowns for chaste nymphs.”
[438-14] Lass-lorn means forsaken by his lass.