Hydrocotyle leucocephala, or Brazilian Pennywort, is one of the less demanding stem plants.
 
This little gem is found  in the shallows of crystal clear rivers, and also in the moist, compressed undergrowth of the jungle. In aquariums it grows very quickly, and is highly recommended for beginner aquarists. As soon as the shoots reach the water’s surface, they continue to grow and spread. Due to this rapid growth, the stems need frequent cutting and replanting.