3 literature references:

Author: Farjon, A.
Year: 2010
Title: A Handbook of the World's Conifers
Source: E.J. Brill, Leiden
Author: Wu, Z.Y. & Raven, P.H. (eds.)
Year: 1999
Title: Flora of China, Vol. 4
Source: Science Press, Beijing & Missouri Botanical Garden Press, St. Louis
Author: Schroeter, A.L. & Panasiuk, V.A.
Year: 1999
Title: Dictionary of plant names
Source: Koeltz Scientific Books, Koenigstein