| Classification | Polygonaceae: Polygonum |
| Classification 1 | Polygonaceae: Persicaria |
| Classification 2 | Polygonaceae: Polygonum |
| Harvard University Herbaria Barcode(s) | 00036735 |
| Type Status | Holotype |
| Collector | M. L. Fernald & B. H. Long |
| Collector number | 16766 |
| Country | United States of America |
| State | Massachusetts |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Massachusetts: Barnstable County: Barnstable |
| Locality | Half-way Pond |
| Date Collected | 1918-09-04 |
| Habitat | Wet peaty shores and hollows |
| Container | Flora of Massachusetts |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/d618cdc5-1961-41d9-acef-520579b6e333 |
| Harvard University Herbaria Barcode | 00036735 |
| Herbarium | GH |
| Family | Polygonaceae |
| Determination | Polygonum hydropiperoides var. opelousanum (Riddell) W. Stone |
| Determination Remarks | [is label name] |
| Family | Polygonaceae |
| Determination | Polygonum opelousanum var. adenocalyx Stanford |
| Determined by | [E. E. Stanford (scripsit) annotation on sheet, W. T. Kittredge, 2019] |
| Date Determined | 1924 |
| Annotation Text | Type |
| Family | Polygonaceae |
| Determination | Persicaria hydropiperoides (Michaux) Small |
| Determined by | Kittredge, Walter Tobey |
| Date Determined | 2019 |
| Determination Remarks | [is Current name] |
| Family | Polygonaceae |
| Type Status | Holotype |
| Holotype of | Polygonum opelousanum var. adenocalyx Stanford |
| Verified by | Kittredge, Walter Tobey |
| Date Determined | 2019 |
| Determination Remarks | [is filed under name] |
| Taxon Reference | (for Polygonum opelousanum var. adenocalyx Stanford) Rhodora 1926. 28(326): 28. |
| Sex | not determined |
| Phenology | FlowerAndFruit |
| Preparation Type | Sheet |
| Preparation Method | Pressed |
