oval leaf knotweed

Polygonum arenastrum

Member of common knotgrass complex (complex Polygonum aviculare)
knotweeds (genus Polygonum)
knotweed family (family Polygonaceae)
dicots (class Magnoliopsida)
flowering plants (subphylum Angiospermae)

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• included here since iNaturalist includes purported local observations
• I can find no description of how this is different from prostrate knotweed (Polygonum aviculare)
• many sources consider this to be a subspecies/variety of prostrate knotweed (Polygonum aviculare)

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Chris’s observations: none

Not all sites include this taxon:

• Polygonum arenastrum → iNaturalist
• not listed → Calflora – CalPhotos – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora