Distribution of Virginia Knotweed (Polygonum virginianum) specimens in the ISM Herbarium |
Polygonum virginianum Records for Hancock County, Illinois- ISM accession# 21945
- Collector: Brinker, Robert R.
Date: 10 Aug 1945 - ISM accession# 49853
- Collector: Winterringer,glen S.
Date: 16 Aug 1956
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