玛瑙珠（学名：Solanum diphyllum），又名黄果龙葵，为茄科茄属下的一个种。

Solanum diphyllum, commonly known as the twoleaf nightshade, is a species of nightshade native to the Americas. It is cultivated as an ornamental plant for its clusters of dark green round fruits that turn a bright yellow when ripe.