Plant ID sources

NRCS PLANTS Database

http://plants.usda.gov/index.html

AQUAPLANT - This web site was designed to help pond owners and their advisors in the identification and management of aquatic vegetation.
http://aquaplant.tamu.edu/index.htm

Good discussion of curly leaf pondweed. The link provided in the thread below is a must watch educational video about too many plants in a pond and grass carp all presented by Sandman. Watch it.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=347346#Post347346

Here is a good discussion of use of glysophate for controlling cattails and other emergent plants around the pond-lake shoreline.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=349287#Post349287

Here is a link to a very good 213 page handbook (pdf) of Biology and Control of Aquatic Plants written by 23 plant experts throughout the USA (mostly University professors). The handbook has 13 chapters, 6 Appendices and a glossary. Chapter 13 is a monograph and discusses in detail 10 common invasive noxious aquatic weeds. The handbook costs $19.95 as a hard copy publication. See it free at:
http://www.aquatics.org/aerf_handbook.pdf

Note to readers the original link was incorrect and a thoughtful member pointed out my error and I reposted this with the correct link to the Plant Management Handbook.