 Clingstone varieties of fruits in the genus "Prunus" are preferred as table fruit and for jams, because the flesh of clingstone fruits tends to be more tender and juicy throughout.Tryma is a specialized term for such nut-like drupes that are difficult to categorize.Hickory nuts ("Carya") and walnuts ("Juglans") in the Juglandaceae family grow within an outer husk; these fruits are technically drupes or drupaceous nuts, thus are not true botanical nuts.