Prostrate Knotweed
Polygonum aviculare Linnaeus
Prostrate Knotweed: https://marylandbiodiversity.com/species/3538
Synonyms
Polygonum arenastrum
Polygonum articulata
Polygonum aviculare ssp. bellardii
Polygonum aviculare ssp. depressum
Polygonum bellardii