Hi Amy,
I'd love to see a picture of your rescued plant.* You will have to reduce the size or you can post the pictures at a free site like photobucket.com and then post the url here for your album.
In the meantime, if the soil is dry, water until the water runs through the drainage holes.* Don't let it sit in water for more then 5 or 10 minutes.*
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.