Hydrocotyle leucocephala, Brazilian pennywort, is native to wet and boggy areas in Central and South America. It is very easy to cultivate, which makes it an optimal aquarium plant that has been around in the hobby for a very long time.
The leaves of H. leucocephala are roundish and grow on a tendril-like stem. This pennywort is one of the easiest aquarium plants and can be recommended to beginning aquarium keepers without any reservation. It does well in almost any water parameters and doesn't have high requirements regarding lighting and CO2 concentration. Even high temperatures are not really a problem, which makes it a great candidate for planted Discus tanks.
Its leaves turning yellow at the edges are a sure sign of iron deficiency, which can easily be remedied by adding an iron fertilizer to the water, though.