The name cowslip is not derived from the lips of the cow, but, according to Skeat, the great Anglo-Saxon authority, it comes from an Anglo-Saxon word meaning dung and was given to the plant because it springs up in meadows where cows are pastured.
"The common field Cowslip," says Parkinson, "I might well forbear to set down, being so plentiful in the fields; but because many take delight in it and plant it in their gardens, I will give you the description of it here. It hath divers green leaves, very like unto the wild Primrose, but shorter, rounder, stiffer, rougher, more crumpled about the edges and of a sadder green color, every one standing upon his stalk which is an inch or two long. Among the leaves rise up divers long stalks, a foot or more high, bearing at the top many fair, yellow, single flowers with spots of a deep yellow at the bottom of each leaf, smelling very sweet.
"In England they have divers names according to several countries, as Primroses, Cowslips, Oxlips, Palsieworts and Petty Mullins. The Frantic Fantastic, or Foolish, Cowslip in some places is called by country people Jack-an-Apes-on-Horseback, which is a usual name given by them to many other plants, as Daisies, Marigolds, etc., if they be strange or fantastical, differing in form from the ordinary kind of the single ones. The smallest are usually called through all the North Country Birds' Eyen, because of the small yellow circle in the bottoms of the flowers resembling the eye of a bird."
OXLIP (Primula eliator). The oxlip combines the qualities of primrose and cowslip. "These two plants," writes a botanist, "appear as divergent expressions of a simple type, the cowslip being a contracted form of primrose, the sulphur yellow and the fine tawny, watery rays of the latter brightened into well defined orange spots. In the oxlip these characters anastomose."
Thus, partaking of the character of primrose and cowslip, the oxlip is considered by some authorities a hybrid. "The oxlip and the polyanthus," says Dr. Forbes Watson, "with its tortoiseshell blossoms, are two of the immediate forms; the polyanthus being a great triumph of the gardener's art, a delightful flower, quite a new creation and originally produced by cultivation of the primrose." In England the oxlip is found in woods, fields, meadows, and under hedges. Though a spring flower it lingers into summer and is found in company with the nodding violet, wild thyme, and luscious eglantine on the bank where Titania loved to sleep lulled to rest by song.[29] Perdita speaks of "bold oxlips" ("The Winter's Tale," Act iv, Scene iii); and compared With the primrose and cowslip the flower deserves the adjective.
"Oxlips in their cradles growing," in the song in "The Two Noble Kinsmen,"[30] which Shakespeare wrote with John Fletcher, shows great knowledge of the plant, for the root-leaves of the oxlip are shaped like a cradle.
Parkinson writes: "Those are usually called oxlips whose flowers are naked, or bare, without husks to contain them, being not so sweet as the cowslip, yet have they some little scent, although the Latin name doth make them to have none."
[29] "A Midsummer Night's Dream"; Act II, Scene II.
[30] Act I, Scene I.