Description: This is thought to be the hybrid between Apium inundatum and Apium nodiflorum. It is a rare plant, much less common than its supposed parents. Most records are from Lough Neagh and Lough Erne. It resembles Apium inundatum in size but the submerged leaves are not finely divided.

All names: Apium inundatum x nodiflorum (A. x moorei) (Syme) Druce; Apium x moorei (Syme) Druce; Apium inundatum x nodiflorum

Distribution Map from NBN: Apium inundatum x nodiflorum at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Apium inundatum x nodiflorum at iNaturalist World Species Observations database.