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Wolffia are free-floating aquatic plants with fronds that are nearly spherical to cylindrical in shape and lack airspaces or veins. [1] [3] They do not have roots. [1]Their rarely seen flowers originate from a cavity on the upper surface of the frond, and each flower has one stamen and one pistil.
Salvinia natans has two nickel-sized leaves lying flat against the surface of the water, and a third submerged leaf which functions as a root. Flotation is made possible by pouches of air within the leaves. Cuticular papillae on the leaves' surface keep water from interfering with the leaves' functioning, and serve to protect them from decay ...
Aquatic plants require special adaptations for prolonged inundation in water, and for floating at the water surface. The most common adaptation is the presence of lightweight internal packing cells, aerenchyma , but floating leaves and finely dissected leaves are also common.
These plants have a simple structure, lacking an obvious stem or leaves. The greater part of each plant is a small organized "thallus" or "frond" structure only a few cells thick, often with air pockets that allow it to float on or just under the water surface. Depending on the species, each plant may have no root or may have one or more simple ...
The plant can yield can reach 8–10 tonnes fresh matter per hectare in Asian paddy fields. 37.8 tonnes fresh weight/ha (2.78 t/ha dry weight) has been reported for A. pinnata in India. [14] Azolla floats on the surface of water by means of numerous small, closely overlapping scale-like leaves, with their roots
The leaves grow in joined sets of three, with two leaves floating on the surface and one leaf dissected, hanging underneath. [4] This species is rootless but the dissected leaves that hang down act as root-like structures and are longer than the floating leaves. [4] Fine white hairs grow uniformly on the leaf surface and serve to repel water.
Salvinia or watermosses [1] is a genus of free-floating aquatic ferns in the family Salviniaceae.The genus is named in honor of 17th-century Italian naturalist Anton Maria Salvini, and the generic name was first published in 1754 by French botanist Jean-François Séguier in Plantae Veronenses, a description of the plants found around Verona. [2]
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.