Center for Aquatic & Invasive Plants, 7922 NW 71st St., Gainesville, FL 32653, (352) 392-1799, Fax (352) 392-3462, varamey@nersp.nerdc.ufl.edu, http://plants.ifas.ufl.edu. Randall K. Stocker, director.

Midwest Aquatic Plant Management Society, PO Box 100, Seymour, IN 47274, (812) 497-2410, Fax (812) 497-2460, www.mapms.org.

USDA ARS Aquatic Weed Control Laboratory, Robbins Hall, UC Davis, Davis, CA 95616, (530) 752-6260, (530) 752-4604, http://wric.ucdavis.edu/exotic/exotic.htm.