Murdannia is a genus of annual or perennial monocotyledonous flowering plants in the dayflower family. The genus is one of the largest in the family. They are most easily distinguished from other genera in the family by their three-lobed or spear-shaped antherodes (i.e. non-functional anthers). Also, along with the closely related genus Anthericopsis, it is the only genus with staminodes (i.e. non-functional stamens) opposite the petals. The genus is named in honor of Murdan Aly, plant collector and former director of the herbarium at Saharunpore, India.