Cryptanthus is a genus of plants found in the Bromeliaceae family. Cryptanthus bromeliads are unique in that they only grow terrestrially as opposed to many other bromeliads that can grow mounted on a substrate. Cryptanthus are more commonly known as Earth Stars, a name they received because of the shape of their foliage. Most Cryptanthus grow close to the ground and can be as small as three inches in height. However, there are some species of Cryptanthus that can grow as tall as three feet.