The leaf is more round like, looks like straw. Cyperus helferi is a flat leaf with a center vein, and lighter green. The leaves on this form of eleocharis do not branch. They grow straight up and out of the water, or may arch over. It can easily reach three feet. Its also kept as a marginal pond plant. It is like a pond reed or rush, as many eleocharis species are.
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grow in the water and then out of the tank without changing forms.
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You mean like Anubias?
Not all plants change form, but are still able to adapt to underwater or above water.