I recently read about Indian Spinach and was wondering what plant it is. After some searching on Google, landed upon http://www.medindia.net/alternativemedicine/ayurvedaanddiet/Herbal-Plants/Indian-spinach.asp.
Its a wonderful site containing descriptions on a collection of Herbal Leaves. If you can follow the Tamil language, the names in Tamil are also present, making life more comfortable. It also gives information on problems solved by the herbs, and a nice recipe to turn the herbal leaves into a nice dish for dinner.