[Old Fr. primerole, from L. primula; corrupted in spelling as if from L. prima rosa.] A beautiful early-flowering plant, closely allied to the cowslip, common in meadows and on the banks of streams of England. The evening primrose is a biennial herb from 3 to 6 feet high, resplendent with yellow flowers which open at sundown, common in upland meadows, along fence-rows, and in sunny wastes.