Attributes / relations provided by
♦ 1i-Tree Species v. 4.0, developed by the USDA Forest Service's Northern Research Station and SUNY-ESF using the Horticopia, Inc. plant database.
♦ 2Wood Janka Hardness Scale/Chart J W Morlan's Unique Wood Gifts
♦ 3USDA Plants Database, U. S. Department of Agriculture
♦ 4Wood Technology Transfer Fact Sheets U.S. Department of Agriculture - Forest Service
♦ 5HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández
♦ 6Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P.
ScaleNet 4 November 2009
♦ 7"Call of the Bloom", Susan McGrath, National Geographic, March 2014