That is Cyperus haspens, its actually a marginal/pond plant... what you see is the emersed crown which is usually above water. Its cut and attached to wood as a form of propagation.
Basically you will see it grow a long stalk all the way above the surface of your tank, then it will grow the crown above water.
This is what it will look like above your tank's water surface:
Photo Source: https://florafaunaweb.nparks.gov.sg/...l.aspx?id=1921








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