knotgrass definition

  • noun:
    • A low-growing, weedy grass (Paspalum distichum) with spikelets arranged in two rows across the rachis.
    • some of a few weedy flowers of the genus Polygonum having stems with nodes.
    • An annual plant, Polygonum aviculare, within fields and wasteland
    • a common weed with jointed stems (Polygonum aviculare); knotweed.
    • your dog lawn. See under dog.
    • A weed of virtually world-wide circulation, Polygonum aviculare: so-called through the numerous nodes in its stems as well as its thickly spreading habit.
    • By extension, any plant associated with the genus Polygonum, precisely knotweed.
    • In occasional use, a plant of several other genus more or less similar.
    • Couch-grass: a use of skeptical appropriateness.
    • low-growing weedy grass with spikelets over the leaf stems

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