Literature references

2 literature references:

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: Eckenwalder, J.
Year: 2009
Title: Conifers of the world
Source: Timber Press, Portland, Oregon