Great Duckweed
Spirodela polyrhiza
Size: to 0.1"
Habitat: floating free at surface
Notes: Among the smallest seed plants; important food for many waterfowl.
ShipBuildingHistory.com is a resource that I have often used to look up many of the reefs and a few of the wrecks in this website. I recently sent in an update, and received a notice that the author had passed away. The next thing that usually happens in these cases is that the website disappears when the hosting goes unpaid, so I immediately grabbed a copy for myself.
That's when I found that the original site was almost a terabyte in size, and 95% of that was formatting. So I cleaned it up, and cleaned it up, and cleaned it up, and added some navigation structures and other niceties that you would expect. Then I posted my copy as a sub-site here:
More: ShipBuildingHistory.com ...