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Limnobium laevigatum is a floating aquatic plant, which can be mistaken for water hyacinth (Eichornia crassipes) due to their superficial similarity.Juvenile plants grow in rosettes of floating leaves that lie prostrate upon the water surface, a distinguishing character of the juvenile plant is the presence of spongy aerenchyma tissue upon the abaxial surface (underside) of the leaf.
Floating plants are those that are not anchored to the soil at all, but are free-floating on the surface. In water gardening, these are often used as a provider of shade to reduce algae growth in a pond. These are often extremely fast growing/multiplying. Examples of these are: Mosquito ferns (Azolla spp.) Water-spangle (Salvinia spp.)
Ceratopteris is a fairly popular aquarium plant, often sold under the name "water sprite." It may be grown as an emersed but natant (floating) plant, or as an immersed plant rooted in the substrate. Under the right conditions the plants will grow fully emerse erect leaves.
Luronium natans is a species of aquatic plant commonly known as the floating water-plantain. It is the only recognized species in the genus Luronium , native to western and central Europe, from Spain to Britain to Norway east to Ukraine.
Riccia fluitans, the floating crystalwort, [3] is an aquatic floating plant of the liverwort genus Riccia which is popular among aquarists as a retreat for young fry and is used in live-bearing tanks. It can be found floating in ponds, and often forms thick mats on and under the water surface.
Other notable invasive plant species include floating pennywort, [58] Curly leaved pondweed, [57] the fern ally Water fern [57] and Parrot's feather. [59] Many of these invasive plants have been sold as oxygenating plants for aquaria or decorative plants for garden ponds and have then been disposed of into the environment. [57]
Glyphosate applied to floating leaves after emergence during late spring or summer has been used as a chemical control for N. peltata. [18] Nonetheless, repeated applications are necessary, [18] and spraying floating leaves shows 40-50% control for a single season. [3] Dichlobenil is more effective than glyphosate in controlling N. peltata. [3]
C. thalictroides is widely used as an aquarium plant, [4] and is prized for its versatility, being used both as a floating plant and a plant that can be rooted in the substrate. [10] The plant can be used as manure for rice. [4] C. thalictroides is used medicinally as a poultice for dermatological issues in Malaysia and the Philippines. [4]