Anubias nana is a short plant with broad leaves. Its dark green colors make it an attractive plant and it will help keep your tank water clean and oxygenated.
Anubias is a genus of aquatic and semi-aquatic flowering plants in the family Araceae, native to tropical central and western Africa. They primarily grow in rivers and streams, but can also be found in marshes. They are characterized by broad, thick, dark leaves that come in many different forms.  They are a very hardy plant which can be easily propagated although they are slow growers.
Please note that because this is a natural product shapes of the picture are an indication only.