1. Department of Botany; University of British Columbia; 6270 University Boulevard Vancouver BC V6T 1Z4 Canada
2. Agroforestry Development Centre; Agriculture and Agri-Food Canada; Indian Head SK S0G 2K0 Canada
3. Greenwood Resources; Portland OR 97201 USA
4. Department of Forest and Conservation Sciences; University of British Columbia; 6270 University Boulevard Vancouver BC V6T 1Z4 Canada
5. Department of Wood Science; University of British Columbia; 6270 University Boulevard Vancouver BC V6T 1Z4 Canada