The strange questions are really out today. Another individual just asked how many Anthurium species grow in water as aquatic species since they wanted to grow one in their aquarium. I have been asked this question many times and the answer is NONE! In South and Central America you can find some species such as Anthurium sagittatum Anthurium riparium, Anthurium amnicola, Anthurium werfii, and Anthurium antiquiense growing as riparins in high water during the rainy season and a few will exist for a long time that way. There are species such as Anthurium amnicola and a few of the others mentioned that grow as rheophytes living with their roots attached to moderate or large stones in streams that have a fast water flow but again, these aren't truly aquatic in the strict sense of the term. The downstream side of a rock sitting in water is where the highest spray and humidity is found. If the plant has its roots in the water it would be able to collect highly oxygenated air as a result of the turbulence moving around the rock. The downstream side of the rock is a safer place to exist since the force of the water is much lower as opposed to the upstream side and the plant would suffer less damage while using the rock as a shield. However, the Anthurium is not truly living aquatically in the water since it is attached to the rock near the water's surface. Instead of being aquatic the specimen is a form of a lithophyte or rock dweller (litho-FIT) that uses a specialized position in the river or stream to gain both dissolved nutrients as well as a higher source of oxygen. Botanist Dr. Tom Croat has repeated more than a few times there is no such thing as an aquatic Anthurium species and he is recognized as the world's leading authority in Anthurium species. This entire subject appears to date back to an ad placed in a few garden magazines some years ago offering Anthurium regale grown in water. The ad was poorly written and did not accurately quote the grower! The grower was Dr. Mardy Darian in southern California and Dr. Darian clearly stated in several personal telephone conversations he had grown his seeds in sphagnum moss which was placed in clay pots sitting in very shallow water. The moss acted as a wick to bring the water up to the roots. This is a common way to germinate Anthurium seeds but it is not the way Anthurium species grow year-round in the wild. Most Anthurium species grow on the branches of a tree as epiphytes. Others are terrestrial species but none grow aquatically in water. Virtually all the epiphytic species can be also grown in soil if the soil mix is porous and not soggy. If you try to grow an Anthurium such as Anthurium sold as "Flamingo Flower" in water the poor plant will die a slow death. There are Anthurium plants sold in Hawaii which have been rooted to porous volcanic stone and the stones are left sitting in shallow water. The purpose is to bring water through the stone to the roots of the Anthurium but is not designed to promote aquatic growth. By the way, many Anthurium species grow attached to stone in nature but they are in a rain forest with lots of rain! Sorry about that, but the notion of an "aquatic Anthurium" is not a good idea to try although I fully expect to receive some rebuttal on this subject.