Lookalike guide
New Zealand pygmyweed vs Water starwort
Both form bright green mats in ponds and ditches.
Water starwort (Callitriche species): Native pond plant.
| Feature | New Zealand pygmyweed | Water starwort |
|---|---|---|
| Leaves | Small, fleshy, narrow, in pairs fused at the base | Spoon-shaped rosettes at stem tips |
| Mats | Dense, choking, year-round | Looser |
Quick test
Fleshy paired needle-like leaves suggest pygmyweed — send a photo to be sure.