| Scientific Name | Polygonum douglasii Greene |
| Family | Polygonaceae |
| Common Names | Douglas’ knotweed, Douglas’s knotweed |
| Eastern Washington | Native |
| Conservation Status | |
| Notes |
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Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 
Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 
Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 
Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 
Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 
Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 
Along Hwy 129 0.38 mi S of Field Springs State Pk; 46.08782N 117.17684W; Asotin Co., WA; 7/25/2012 North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 
North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 
North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 
North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 
North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012 North edge of Mcdowell Lake; ca. 10.5 air mi. SE of Colville, WA; N 48.46953 W 117.68309; Stevens Co.; 8/25/2012