Disporum viridescens
Disporum viridescens is a species of flowering plant in the genus Disporum. Like other species in the genus, it grows from a rhizome. The plant is , with a stem that may branch. The leaves are more-or-less ovate in shape with a very short petiole (stalk). One or two open flowers are borne at the ends of stems; they have greenish white tepals which are  long. Flowering is in late spring to early summer (May to June in the northern hemisphere). Black berries around  in diameter appear a few months later. Plants grow in woodland or on grassy slopes at altitudes up to  in northeastern China, eastern Russia, Japan, and Korea. References

viridescens
Flora of Japan
Flora of Korea
Flora of China
Flora of Russia
Plants described in 1911