Oyster Nut or Queen’s Nut
This vine from the pumpkin family from eastern Africa is the source of an exquisite nut known as oyster nut: a large, flat nut that rivals almonds in flavor intensity with a taste somewhere between a macadamia and a pumpkin seed. The vines are vigorous perennials that grow very quickly and start producing after about one and a half years. They are dioecious, so male and female plants are required to produce fruits. The fruits ripen in about 4-6 months from the time of flowering and ripe fruits gradually split open to reveal the awesome seeds. With its large leaves, it is also a desirable ornamental. Strangely, it is hardly known outside of its native range.