Portrait of Taufa'ahau Tupou IV in uniform.

Sweet potatos. The inscription "Fakalahi meʻakai" means in Tongan "Grow more food".

The sweet potato (Ipomoea batatas) is a dicotyledonous plant that belongs to the morning glory family Convolvulaceae. Its large, starchy, sweet-tasting, tuberous roots are a root vegetable. In some parts of the English-speaking world, sweet potatoes are locally known by other names, including "yam" and kumara. The young leaves and shoots are sometimes eaten as greens. The sweet potato is only distantly related to the potato (Solanum tuberosum) and does not belong to the nightshade family Solanaceae, but that family is part of the same taxonomic order as sweet potatoes, the Solanales.