knotgrass(redirected from Polygonum aviculare)
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1. A low-growing, weedy grass (Paspalum distichum) with spikelets arranged in two rows along the rachis.
2. Any of several weedy plants of the genus Polygonum having stems with nodes.
1. (Plants) Also called: allseed a polygonaceous weedy plant, Polygonum aviculare, whose small green flowers produce numerous seeds
2. (Plants) any of several related plants
1. a common knotweed, Polygonum aviculare, with small leaves and dry fruit that are eaten by birds.
2. a widespread creeping grass, Paspalum distichum, that forms large mats in shallow waters and ditches.