American Association for Advancement of Science
http://www.aaas.org/

American Institute of Biological Sciences
http://www.aibs.org/core/index.html

American Society of Plant Physiologists
http://www.aspp.org/

American Society of Plant Taxonomists
http://www.csdl.tamu.edu/FLORA/aspt/aspthome.htm

Botanical Society of America
http://www.botany.org/

National Science Teacher’s Association
http://www.nsta.org/