Prunus apricots, of cherries, and of plums, all of which have cultivars developed for commercial fruit and nut production. The almond is not a true nut, the edible part is the seed. Other species are occasionally cultivated or used for their seed and fruit. A number of species, hybrids, and cultivars are grown as ornamental plants, usually for their profusion of flowers, sometimes for ornamental foliage and shape, and occasionally for their bark. The Tree of 40 Fruit has forty varieties grafted on to one rootstock. Species such as blackthorn ("Prunus spinosa"), are grown for hedging, game cover, and other utilitarian
Prunus africana buttock", because the two lobes of the fruit resemble the human gluteus maximus muscles. In 1965, Cornelis Kalkman moved "Pygeum" to "Prunus", and this classification has the authority for now. However, a recent cladistic study notes of "Pygeum": "its relationships to "Prunus" remain to be tested by molecular cladistics." "Prunus africana" is known by the common names African cherry, pygeum (from its former scientific name, "Pygeum africanum"), iron wood, red stinkwood, African plum, African prune, and bitter almond. In other languages spoken where it grows, it is known as "tikur inchet" in Amharic, "mkonde-konde" in Chagga, "muiri" in Kikuyu, "entasesa"