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.
♦ 2USDA Plants Database, U. S. Department of Agriculture
♦ 3Forest Inventory and Analysis DB version 5.1, May 4, 2013, U.S. Forest Service
♦ 4Kattge, J. et al. (2011b)
TRY - a global database of plant traits Global Change Biology 17:2905-2935
♦ 5The Cactus Ferruginous Pygmy-Owl: Taxonomy, Distribution, and Natural History, Jean-Luc E. Cartron, W. Scott Richardson, Glenn A. Proudfoot, USDA Forest Service Gen. Tech. Rep. RMRS-GTR-43. 2000