1. USDA Forest Service, Southern Research Station, 81 Carrigan Drive, Aiken Center, University of Vermont, Burlington, VT 05405
2. University of Vermont, Department of Plant Biology, Burlington, VT
3. USDA Forest Service, Southern Research Station, Bent Creek Exp. Forest, NC
4. USDA Forest Service, Southern Research Station, RTP, NC
5. USDA Forest Service, National Seed Laboratory, Dry Branch, GA