Commelina tuberosa is an herbaceous plant in the dayflower family found in Central and South America, but grown worldwide as an ornamental plant. It is characterized by its purple-splotched spathes with free margins, its bright blue petals of equal size, its tuberous roots, and its four to ten flowered lower cymes. In the wild, it is encountered in moist fields, open forests, or pine-oak forests. The species is sometimes considered to include the species Commelina coelestis, Commelina dianthifolia, and Commelina elliptica, such as in the Flora Mesoamericana. When these are treated as separate, they are often referred to as the "Commelina tuberosa complex". Horticulturally, the species are often treated as separate entities because of their differing habits and leaf shapes. In this sense, Commelina tuberosa is a low-growing plant with long narrow leaves.
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- Cullen, James; Knees, Sabina G.; Cubey, H. Suzanne (2011), The European Garden Flora, Flowering Plants 1 (2 ed.), Cambridge University Press, p. 319, ISBN 978-0-521-76167-3
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