brook grass
noun
: an aquatic perennial grass (Catabrosa aquatica) that is widely distributed in the northern hemisphere and sometimes used for pasture, that roots at the lower nodes, and that has overlapping leaf sheaths, soft flat leaves, and a pyramidal inflorescence
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“Brook grass.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brook%20grass. Accessed 22 Nov. 2024.
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