Polygonum majus February 28, 2020December 24, 2019 by rcarr Scientific NamePolygonum majus (Meisn.) PiperFamilyPolygonaceaeCommon NamesPalouse knotweed, wiry knotweedEastern WashingtonNativeSynonymsNoneConservation StatusNotes Click on any image to enlarge it. W. of Cheney off Baker rd 0.4 mi E of Ritchey rd. – Spokane Co., WA – 7/17/2009W. of Cheney off Baker rd 0.4 mi E of Ritchey rd. – Spokane Co., WA – 7/17/2009W. of Cheney off Baker rd 0.4 mi E of Ritchey rd. – Spokane Co., WA – 7/17/2009Sand dunes west of the mouth of Rock Creek, w of Roosevelt, WA; N 45.70340 W 120.46707; Klickitat Co.; 6/15/2012Sand dunes west of the mouth of Rock Creek, w of Roosevelt, WA; N 45.70340 W 120.46707; Klickitat Co.; 6/15/2012Sand dunes west of the mouth of Rock Creek, w of Roosevelt, WA; N 45.70340 W 120.46707; Klickitat Co.; 6/15/2012Sand dunes west of the mouth of Rock Creek, w of Roosevelt, WA; N 45.70340 W 120.46707; Klickitat Co.; 6/15/2012Sand dunes west of the mouth of Rock Creek, w of Roosevelt, WA; N 45.70340 W 120.46707; Klickitat Co.; 6/15/2012S of Vantage, WA; Ca. 0.6 mi S of Wanapum Dam; N 46.86242 W 119.97033; Kittitas Co.; 6/17/2013S of Vantage, WA; Ca. 0.6 mi S of Wanapum Dam; N 46.86242 W 119.97033; Kittitas Co.; 6/17/2013S of Vantage, WA; Ca. 0.6 mi S of Wanapum Dam; N 46.86242 W 119.97033; Kittitas Co.; 6/17/2013S of Vantage, WA; Ca. 0.6 mi S of Wanapum Dam; N 46.86242 W 119.97033; Kittitas Co.; 6/17/2013S of Vantage, WA; Ca. 0.6 mi S of Wanapum Dam; N 46.86242 W 119.97033; Kittitas Co.; 6/17/2013Cliff base N of W bridge at Kamiah, ID along Hwy 12 and Woodland Rd.; N 46.23109 W 116.01592; Idaho Co.; 6/7/2015Cliff base N of W bridge at Kamiah, ID along Hwy 12 and Woodland Rd.; N 46.23109 W 116.01592; Idaho Co.; 6/7/2015Cliff base N of W bridge at Kamiah, ID along Hwy 12 and Woodland Rd.; N 46.23109 W 116.01592; Idaho Co.; 6/7/2015Cliff base N of W bridge at Kamiah, ID along Hwy 12 and Woodland Rd.; N 46.23109 W 116.01592; Idaho Co.; 6/7/2015