Herbarium specimen: Groenlandia densa
| Taxon: | Groenlandia densa (L.) Fourr. ("Opposite-leaved Pondweed") named by James Edgar Dandy 1946 |
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| Locality: | Great Britain, Sussex, East or West Sussex |
| ex herb: | Warrington Museum Mr William Wilson |
| Institution: | Manchester Museum (MANCH) |
| Accession number: | MANCH.346913.Kk892 |
