All of the following are true plants except seaweed halophytes(Kelp).
Kelp is the large brown seaweed halophyte algae that make up the class Laminariales. There are about 30 different genera.
Despite its appearance, kelp is not a plant - it is a heterophyletic species, a completely independent group of organisms.
Kelp grows in "underwater forests" (kelp forests) in shallow oceans, and is thought to have originated in the Miocene, 5-23 million years ago.
These organisms require nutrient-rich water with temperatures between 6 and 14°C (43 and 57°F).
They are known for their high growth rates - the genera Macrocystis and Nereocystis can grow as fast as half a meter per day, eventually reaching 30–80 meters (100–260 ft).
In the 19th century, the word "kelp" was closely associated with seaweed that could be burned to obtain soda ash (mainly sodium carbonate).
The algae used include species of the orders Laminariales and Fucales. The word "kelp" has also been used directly to refer to these processed ash.
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