Distribution of Illinois Pondweed (Potamogeton illinoensis) specimens in the ISM Herbarium |
Potamogeton illinoensis Records for Cass County, Illinois- ISM accession# 42487
- Collector: Rexroat, Rollo T.
Date: 01 Jul 1953 - ISM accession# 45333
- Collector: Rexroat, Rollo T.
Date: 20 Aug 1954 - ISM accession# 55341
- Collector: Rexroat, Rollo T.
Date: 03 Sep 1957 - ISM accession# 74895
- Collector: Rexroat, Rollo T.
Date: 13 Jul 1959
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