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.
♦ 2Plants For A Future licensed under a
Creative Commons Attribution 4.0 License♦ 3Wood Janka Hardness Scale/Chart J W Morlan's Unique Wood Gifts
♦ 4USDA Plants Database, U. S. Department of Agriculture
♦ 5Forest Inventory and Analysis DB version 5.1, May 4, 2013, U.S. Forest Service
♦ 6Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P.
ScaleNet 4 November 2009
♦ 7Spermophilus variegatus, Emily C. Oaks, Paul J. Young, Gordon L. Kirkland, Jr., and David F. Schmidt, MAMMALIAN SPECIES No. 272, pp. 1-8 (1987)
♦ 8HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández