Photo 97022555, (c) Peter Zika, some rights reserved (CC BY-NC), uploaded by Peter Zika

Attribution © Peter Zika some rights reserved Uploaded by peterzika Source BioDiversity4All Associated observations Photos / Sounds 6 photos What Nuttall's Knotweed (Polygonum nuttallii) Observer peterzika Date September 8, 2020 11:43 AM PDT Place South Fork Stillaguamish River, Snohomish County, Washington, USA (Google, OSM) Date Added September 24, 2020 05:19 PM PDT 2 IDs Research Grade View Sizes small medium large original