Distribution of White Milkweed (Asclepias perennis) specimens in the ISM Herbarium |
Asclepias perennis Records for Pope County, Illinois- ISM accession# 12939
- Collector: Whiting, Alfred F.
Date: 11 Jul 1939 - ISM accession# 12940
- Collector: Whiting, Alfred F.
Date: 11 Jul 1939 - ISM accession# 33169
- Collector: Winterringer,glen S.
Date: 10 Aug 1950
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