Difference between Marsh Marigold and Cowslip

MARSH MARIGOLD vs COWSLIP: NOUN

Caltha palustris, a perennial plant with bright yellow flowers.
A golden-flowered plant, Caltha palustris: in the United States also called cowslip. See Caltha and gowan.
Any of several plants of the genus Caltha of the buttercup family, especially C. palustris, which grows in wetlands and has bright yellow flowers.
Swamp plant of Europe and North America having bright yellow flowers resembling buttercups

A plant in the buttercup family, Caltha palustris, growing in wet, boggy locations.
A low-growing plant, Primula veris, with yellow flowers.
Bear's-ear (Primula Auricula).
A pretty flower of the West (Dodecatheon Meadia), belonging to the same order (Primulaceæ) with the English cowslip.
In the United States, the marsh marigold (Caltha palustris), appearing in wet places in early spring and often used as a pot herb. It is nearer to a buttercup than to a true cowslip. See Illust. of Marsh marigold.
A common flower in England (Primula veris) having yellow blossoms and appearing in early spring. It is often cultivated in the United States.
In the United States, the more common name of the marsh-marigold, Caltha palustris.
The popular name of several varieties of Primula veris, a favorite wild flower found in British pastures and hedge-banks, and cultivated in the United States. It has umbels of small, buff-yellow, scented flowers on short pedicels. Its flowers have been used as an anodyne.
A Eurasian primrose (Primula veris) having fragrant yellow flowers, widely cultivated as an ornamental and long used in herbal medicine.
Swamp plant of Europe and North America having bright yellow flowers resembling buttercups
Early spring flower common in British isles having fragrant yellow or sometimes purple flowers

A perennial plant of the genus Caltha (Caltha palustris), growing in wet places and bearing bright yellow flowers. In the United States it is used as a pot herb under the name of cowslip. See cowslip.

Eupatorium, Oxeye daisy, Dusty miller, Highbush cranberry, Kangaroo paw, Pussy willow, Grape hyacinth, Trout lily, Wood anemone, Water dragon, Meadow bright, May blob, Kingcup, Caltha palustris, Cowslip

Nasturtium, Dusty miller, Wood anemone, Delphinium, Polyanthus, Pot marigold, Primula, Meadow bright, Caltha palustris, Kingcup, Water dragon, May blob, Primula veris, Paigle, Marsh marigold

Deciduous holly, Sumacs, Lungwort, Swamp milkweed, Snowberry, Eupatorium, Dusty miller, Highbush cranberry, Kangaroo paw, Pussy willow, Grape hyacinth, Trout lily, Wood anemone, Kingcup, Cowslip

Saxifrage, Tradescantia, Fritillary, Hippeastrum, Syringa, Lungwort, Nasturtium, Dusty miller, Wood anemone, Delphinium, Polyanthus, Pot marigold, Primula, Kingcup, Marsh marigold

Marsh Marigold is an herbaceous perennial with an upright spreading habit of growth.
The biggest difference is that lesser celandine spreads into a thick mat, while marsh marigold does not.

Amongst the grasslands abutting the walks lies a multitude of wild flowers including Cowslip, Milkwort, Scabious and Wild Parsnip.
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She reminded me of a scared cowslip that had been cut and laid in the sun an hour.