Oldenlandia corymbosa, commonly known as flat-top mille graines or diamond flower, is a species of plant in the family Rubiaceae. It is an annual herb with ascending or erect stems which are 4-angled. Its genome size is 273.7 megabase pairs. It is a commonly used herb in China and India for treating sore eyes, anthelmintic, antirheumatic, depurative, digestive, diuretic, pectoral, fever, jaundice, child birth, and stomachic medicine, while the roots are reported to have vermifuge properties.

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