Fu Liguo, Yu Yong-fu and Riedl, Harald. 1999. Ephedraceae. In Wu Zheng-yi and Peter H. Raven (eds.). Flora of China, Volume 4. Beijing: Science Press; St. Louis: Missouri Botanical Garden.

The Flora is available online. Go to www.efloras.org, pick "Flora of China", and search for the taxon of interest by its scientific name.