Polygonum aviculare rurivagum (Polygonum aviculare rurivagum)
Description
Common knotgrass is an annual herb with a semi-erect stem that may grow from 10 to 40�cm (4 to 16�in) high. The�leaves�are hairless and short-stalked. They are�longish-elliptical�with short stalks and rounded bases; the upper ones are few and are linear and stalkless. The�stipules�are fused into a stem-enclosing, translucent sheath known as an�ochrea�that is membranous and silvery. The�flowers�are regular, green with white or pink margins. Each has five�perianth�segments, overlapping at the base, five to eight stamens and three fused carpels. The fruit is a dark brown, three-edged nut. The seeds need light to germinate which is why this plant appears in disturbed soil in locations where its seeds may have lain�dormant�for years
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Magnoliopsida
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Order: Caryophyllales
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Family: Polygonaceae
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Genus: Polygonum
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