CF Water Cress Rorippa nasturtium aquaticum

Observation - CF Water Cress Rorippa nasturtium aquaticum - UK and Ireland. Description: Crucier (mustard smell) with lyrate pinnate leaves in eutrophic freshwaters in Co. SLigo. Keyed to Rorrippa n.-aquaticum, but the fimbibrillate leaf margin doesnt fit and is curious...? I know these plants are plastic, can anyone confirm

Crucier (mustard smell) with lyrate pinnate leaves in eutrophic freshwaters in Co. SLigo. Keyed to Rorrippa n.-aquaticum, but the fimbibrillate leaf margin doesnt fit and is curious...? I know these plants are plastic, can anyone confirm