(Croomia japonica)
Croomia japonica is a plant species native to China and Japan. Croomia is a genus of primitive angiosperm herbs in the Stemonaceae family, first described as a genus in 1840. Once included in its own family, Croomiaceae, Croomia has also previously been included in Dioscoreaceae. Croomia is native to China, Japan, and the southeastern United States. The plants grow in moist, shady woods. Their small flowers are borne beneath the leaves.