Plant Id?

[onemisterchristian]

Anyone know what kind of plant the treeish one is.
plant

 

[onemisterchristian]

?

 

[pseud]

I think it might be Myriophyllum mattogrossense but I'm not entirely sure...

 

[WendyinWichita]

Water Sprite is the common name. I don't have access to my books at the moment so don't know the proper name.

 

[red-devil0602]

Ceratopteris thalictroides