Smooth Knotweed Persicaria glabra (Willdenow) M. Gomez  Synonyms: Polygonum densiflorum, Polygonum glabrum.
Dense-flowered Knotweed in Charles Co., Maryland (9/1/2009). Per Kerry: "It lacks bristles on the ocreae and has these large, forked racemes of flowers." Photo by Kerry Wixted. (MBP list)

Dense-flowered Knotweed blooming in Queen Anne's Co., Maryland (8/25/2013). Photo by Jim Brighton. (MBP list)

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