The genus Commelina contains around 215 species of clumping, perennial herbaceous plants commonly known as dayflowers because of their short flower lifespan. They are often grown as annuals, producing flowers one at a time, that last less than a day. Flowers are small, 3-petalled, saucer shaped and encased in a spathe-like modified leaf structure. Flower structure is only symmetrical in one plane, with the petals differing in size and shape across the flower, with two larger top petals and a reduced lower petal which is also often coloured differently to the top petals. Flowers come in a range of colours including blue, purple, yellow, pink and white.