Author Affiliations +
James P. Riser II,1 Chris Kline2
1Plant Biologist, USDA Forest Service, Rocky Mountain Research Station, Forestry Sciences Lab, 800 E. Beckwith Ave., Missoula, MT, 59801
2Senior Instructional Specialist, Boyce Thompson Arboretum, 37615 U.S. Highway 60, Superior, AZ 85273