Prostrate Knotweed (Polygonum aviculare)

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Division - Magnoliaphyta
Class - Magnoliopsida
Subclass - Caryophyllidae
Order - Caryophyllales
Family - Polygonaceae
Genus - Polygonum


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This is a very common weed in Philadelphia, often appearing spreading from the cracks in pavement or sidewalks. It often collects small pieces of trash and generally looks scraggly. It gets small flowers on the underside, which, if visible at all from a standing position, look like mere white specks.

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