Ulmus 'Nigrescens' (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ulmus 'Nigrescens'" in English language version.

refsWebsite
Global rank English rank
6th place
6th place

archive.org

  • Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. 24 (6–8). Arnold Arboretum, Harvard University: 41–80. Retrieved 16 February 2017.