Flora of Northern Ireland
  • Myriophyllum alterniflorum DC. - Alternate Water-milfoil - Halogaraceae
Myriophyllum alterniflorum
(Map updated: March 2008)

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.

NBN Atlas mapping: Species account : NBN Atlas UK Species Observations database

iNaturalist: Species account : iNaturalist World Species Observations database