knotgrass

knot·grass

any of several weedy plants (genus Polygonum) of the buckwheat family; esp., a common weed (P. aviculare) with slender stems, narrow leaves, and small axillary flowers
often called knot′weed·
a creeping grass (Paspalum distichum) growing in wet places in the S U.S.

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knotgrass

noun

A low-growing, weedy grass (Paspalum distichum) with spikelets arranged in two rows along the rachis.
Any of several weedy plants of the genus Polygonum having stems with nodes.

THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE, FIFTH EDITION by the Editors of the American Heritage Dictionaries. Copyright © 2016, 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.