Water Milfoil
Myriophyllum
Floating herb at Lake Baringo, Rift Valley, Kiserian, Kenya, Africa. October 2016.
As can be seen in the photo, the water in Lake Baringo is very turbid. As a result submerged plants would not get sufficient light, giving an advantage to floating plants. Milfoils float because their long stems enclose channels filled with air/gas. Milfoils superficially resemble seaweeds and algae which are non-vascular, non-flowering plants.