Irvine Lake, 8-30-12. © Ron Vanderhoff

Dotted Knotweed

Persicaria punctata

Native to California and is also found elsewhere in North America and beyond.

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Irvine Lake, 8-30-12. © Ron Vanderhoff

Irvine Lake, 8-30-12. © Ron Vanderhoff

Irvine Lake, 8-30-12. © Ron Vanderhoff

Hunt. Central Park, W side, 7-28-16. © Ron Vanderhoff

Hunt. Central Park, W side, 7-28-16. © Ron Vanderhoff