Great Yellow-cress - Rorippa amphibia
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Species Description
Widespread and fairy frequent in the South and scarce in the North. Habitat includes: Calcareous, wet places; usually winter flooded sites which dry out in the Summer such as the margins of rivers / streams, canals, ponds, lakes, reservoirs, marshland etc. Flowers: June to August. Perennial. Seed germination rate is poor so mainly spreads vegetatively via fragments.