Common Persicaria: Jointweed.

Polygonum pennsylvanicum.

Buckwheat Family. July - Sept.

A plant of sprawling, branching habit, 1 - 3 feet high, common in waste places, moist soil.

Flowers

Pink or greenish, small, crowded on short, narrow, terminal spikes.

Leaves

Long, narrow, toothless, tapering toward the tip. Plant stems enlarged at the joints.

Pink Knotweed.

Pink Knotweed.

Lady's Thumb

Polygonum Persicaria.

Is a similar species, leaves usually marked with a dark triangle. Found throughout North America. Naturalized from Europe.