Attributes / relations provided by
♦ 1Wood Janka Hardness Scale/Chart J W Morlan's Unique Wood Gifts
♦ 2Jérôme Chave, Helene C. Muller-Landau, Timothy R. Baker, Tomás A. Easdale, Hans ter Steege, Campbell O. Webb, 2006.
Regional and phylogenetic variation of wood density across 2,456 neotropical tree species. Ecological Applications 16(6), 2356 - 2367
♦ 3Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P.
ScaleNet 4 November 2009
♦ 4Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014).
Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.