Herbarium specimen: Groenlandia densa
| Taxon: | Groenlandia densa (L.) Fourr. ("Opposite-leaved Pondweed") named by James Edgar Dandy 1946 |
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| Collection date: | 1832 |
| Locality: | Great Britain, VC53 South Lincolnshire, Sleaford, TF0645 |
| ex herb: | Warrington Museum Mr William Wilson |
| Institution: | Manchester Museum (MANCH) |
| Accession number: | MANCH.346867.Kk892 |

