The family Lycophyllaceae usually has blue, purple and white flowers, and a few have other colors. There are often appendages in the corolla tube that close the throat, which is the characteristic of this picture. Sweet potato is a raceme, scattered, veinless or bracteate, at the lower part of the flower stalk; Calyx is deeply 5-lobed, and the lobes are slightly prolonged in fruit; Corolla is small, blue or white, tube is shorter than calyx, throat has small scales 5, lobes 5.