It might be this one:
http://www.aquaticscape.com
Oops. I just went there, and it looks like they've taken those "mouseover"
plant maps down. Maybe it got to be too much work to maintain. Bummer. If
they couldn't keep it updated, I wish they'd just left up one version. It was
really neat.
Leigh
http://www.fortunecity.com/lavender/halloween/881/