| Classification | Elatinaceae |
| Harvard University Herbaria Barcode(s) | 00067223 |
| Type Status | Isosyntype |
| Collector | R. S. Williams |
| Collector number | 855 |
| Country | United States of America |
| State | Montana |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Montana |
| Locality | Lake in Lower Sand Coulee, Big Belt Mountains |
| Date Collected | 1891-09-03 |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/e09e4706-66c3-4cc3-bb3a-22782fb2c990 |
| Harvard University Herbaria Barcode | 00067223 |
| Herbarium | GH |
| Family | Elatinaceae |
| Type Status | Isosyntype |
| Isosyntype of | Elatine williamsii Rydberg |
| Determination Remarks | [is filed under name] |
| Taxon Reference | (for Elatine williamsii Rydberg) Mem. New York Bot. Gard. 1900. 1: 260. |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Sheet |
| Preparation Method | Pressed |
