There are the tiny, delicate, lovely and hard to obtain hair grass.
Also there are plants that form a lump on their own, such as the broad-leaved, light green amazon sword, the serrated-edged aponogeton undulatum and the very useful plants that will thrive in great heat and even in dim light - the cryptocorynes.
Numerous aquarium plants just float on the surface of the water and are not rooted. They draw their nourishment from the air and the water. The favourites are riccia, azolla and duckweed. They are useful in providing shade in breeding and as oxygenators.
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