MARSH-MARIGOLD; a genus of the digynia order, belonging to the polyandria clas of plants. There is only one species known, which grows naturally in most boggy lands in many parts of England and Scotland. There is a variety, with very double flowers, which for its beauty is preferred in gardens. It is propagated by parting the roots in autumn. It should be planted in a moist soil and shady situation; and as there are often such places in gardens where few other plants will thrive, so these may be allowed room, and during their season of flowering will afford an agreeable variety. The flowers gathered before they expand, and preserved in salted vinegar, are a good substitute for capers. The juice of the petals, boiled with a little alum, stains paper yellow. The remarkable yellowness of the butter in spring is supposed to be caused by this plant; but cows will not eat it, unless compelled by extreme hunger; and then, Boerhaave says, it occasions such an inflammation, that they generally die. Upon May-day, the country people throw the flowers upon the pavement before their doors. Goats and sheep eat this plant; horses, cows, and swine, refuse it.

CALTROP, in botany. See Tribulus.