The first looks like it might be an anubius species. Perhaps the broadleaved anubias (A. barteri). But it could also be Purple Waffle (Hemigraphis exotica). I need a better photos to see for sure. Just judging by the other two I tend toward the latter. I say this becuase they are not aquatic plants so perhaps that one isn't either. The anubias is, but the purple waffle isn't.
The second one looks like bamboo (not a true aquatic species by the way).
The last looks like a house plant...maybe Green Sandy (Dracaena borquensis).
I am thinking you have three non-aquatic species...sorry...
I could be wrong but that's what they look like to me. I double checked against a couple of plant books I have and that seems to be the case. I am always hessitant to say I'm 100% sure because subtle variations in structure can make all the difference in ID and photos don't always show these.
If it is anubias it will be fine, if it is the other, it will rot over time.
If it is anubias be sure not to cover the roots. Anubias roots need to be open to the water. If you tie the plant to a piece of drift wood or rock the roots will actually grab onto it. I have a small anubias (A. nana) in my 6 gallon tank I'm currently building and it's on a bit of wood.
While the three species I think it is are not aquatic they are hardy and known to be able to live submerged for several months. The problem is that after that they die and fall apart.