Ceratophyllum submersum L., commonly known as the soft hornwort, is a submerged, free-floating aquatic plant.
A very dense submerged population of the soft hornwort was discovered in a pond near Sanem on 21st June 2015 by German botanists Jörg Zoldan and Annette Steinbach-Zoldan during a survey for the nature conservation organisation SICONA-Ouest. The pond had been artificially created in 2010.
- Herbarium number MNHNL22119. ↩