Water-violet - Hottonia palustris
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Species Description
Widespread and locally common in England and Wales, becoming rare in Scotland. Habitat includes: Clear still, shallow, base-rich (not eutrophicated) water bodies, such as ponds, ditches, lakes, grazed marshes, floodplains etc. Growing habit: Heterostylous Stoloniferous Perennial. It requires crosses between pins and thrums to set seed. Height: Up to 1 m.
Stace 4:
Hottonia palustris L. - Water-violet.
Stems to 1m or more, floating under water, rooting at nodes; flowers in tiered whorls on erect peduncle, 15-25mm across, lilac with yellow throat; (2n=20). Native; shallow ponds and ditches; scattered in England and Wales, locally common East England, very locally naturalised in Ireland and Isle of Man.