Peace Lily. These guys survive quit nicely in only water. There was a fad a few years ago where people would put a beta fish in a clear vase with a peace lily sticking out the top. I know this because I had two of the and I had them for years. You don't need the fish, the lily will still work.
Pic of peace lily:
http://ohmyapt.apartmentratings.com/images/peace_lily.jpg
Peace lily in a betta vase: (water only)
http://www.aquariumfish.net/information/betta_fish_vase.htm
Lucky bamboo (Dracenia) will also survive in only water.
http://www.clearlooks.com/images/lucky_bamboo.jpg
I would imagine that any bog plant would work as well. Some of these are what you would find in aquariums.
List of bog plants:
http://www.backyardgardener.com/bog/bogplants.html
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Flower plant that just needs water no dirt?
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