Najas marina
Notifiable organism
Spiny naiad, holly-leaved naiad, sawtooth
- Scientific Name
- Najas marina
- Origin
- Almost cosmopolitan
- Type
- Weed
- Plant Life-form Type
- Submerged
- Taxonomy
- L.
- Presence
- Not known to be in NZ
- Habitat
- Fresh and brackish water, and may be annual or perennial depending on the seasonality of the habitat
- Temperature (°C)
- 16 - 22
- pH range
- 7.0 - 7.5
- Hardness (ppm)
- 100 - 200
- Notes
- Potentially a major weed in New Zealand. Often found in stagnant water with a high percentage of organic mud.
- Propagation
- Plant fragments and seed
- Features
- N. marina is a rooted submerged aquatic plant and maybe annual or perennial depending on the habitat. It has stems up to 100 cm long, with a spiny appearance and few roots. The leaves are sessile, seemingly opposite or whorled, linear to lanceolate in shape (up to ca 4 to 6 cm long by 0.5 to 2.5 mm wide) and generally stiff. The leaf margins are coarsely toothed (triangular). Plants are dioecious, the male flowers have a spathe, the female flowers without.
- Source
- TIFBIS