A few more plants I don't know

[Bicyclemaster]

These are plants that I receved from a friend when I first made my aquarium. He didn't knew wheir name either.

 

[ember04]

2 is pearl weed i think
4 is a type of ludwigia

 

[itiwhetu]

Pictures one and two look like Hygrophila polysperma, Picture 3 is what I would call Java moss. Picture 4 is Ludwigia repens I feel but it could be one of the other Ludwigias just as easily