4 Plant Id Please!

[GoldfishAttentionSpan]

I got these plants from a river here in Florida

This plant looks like it might be dying
Plant 1

Plant 2

Plant 3- the little bitty leaf-looking things- they float and have small roots trailing from them

I think this might be foxtail?

I would really appreciate the help!

Can these plants go in brackish water?

 

[roseykat5]

plant 3 is definately duckweed i have it in my tank take care it will multiply like crazy from what ive been told and will over take your tank but iff u keep it down u be ok
i hve had some started like 50 and now i have 100 give or take ive had it for a mth so in few mths time it will triple that and then double each week or so i dont know

 

[ICEEGRL]

The first one looks like rotalla to me, and the second one I think starts with an h. I can't think of the name right now though. I am not sure though.
Sorry I wasn't more help.

 

[Gill]

plant 2 looks like pennywort

 

[Christine1014]

I would have guessed moneywort on the first one. It's in pretty bad shape, though.

 

[RadaR]

Pic 1 - Some sort of Elodea

Pic 2 - Cardamine lyrata

Pic 3 - Duckweed

Pic 4 - Not sure, could be hornwort.

 

[GoldfishAttentionSpan]

I ended up throwing out the first plant because it looked dead and on the verge of rotting (it was falling apart) so I just have the others now.