BUTTER-NUT

butter-nut, the product of _caryocar nuciferum_, a native of tropical south america. the large nuts, known also as saowari or suwarow nuts, are the hard stone of the fruit and contain an oily nutritious seed. the genus _caryocar_ contains ten species, in tropical south america, some of which form large trees affording a very durable wood, useful for shipbuilding. [illustration: a, leaf of butterwort (_pinguicula vulgaris_) with left margin inflected over a row of small flies. (after darwin.) b, glands from surface of leaf by which the sticky liquid is secreted and by means of which the products of digestion are absorbed.]