Cryptpcorynes are popular aquarium plants, known in the aquarium hobby since the early 20th century. They are also studied by people who do not keep aquariums who typically grow them emersed as part of an general interest in Aroids. Other Aroids are Spathiphyllum ("peace lily") and Anthurium. I like (and have) these plants too, but there are a few of us that believe plants of the genus Cryptocoryne are the elegant kings of the Aroid family. Certainly these are my favorite plants of all time.