Description: Water milfoils are submerged aquatic species with feathery leaves, although the flower spikes are held above the water. The flowers are small and unremarkable.

All occur in still or slow-moving water (lakes, ponds, flooded quarries, drainage ditches, slow streams etc). Myriophyllum alterniflorum is frequent in lakes and rivers; the rare, short-leaved var. americanum occurs in base-rich conditions.

All names: Myriophyllum alterniflorum DC.; Myriophyllum alternifolium DC.

Distribution Map from NBN: Myriophyllum alterniflorum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Myriophyllum alterniflorum at iNaturalist World Species Observations database.