Stellaria palustris resembles the very common stellaria holostea, differing in the narrower, hairless leaves and the more deeply divided petals, as well as the habitat.
Main flower color:
England, Ireland, southern Scotland and east Wales, though only very locally common
Up to 60 cm
Marshes and fens
Five green sepals, with hairless white margins, and five white petals, divided to the base into obovate lobes. Three styles and ten stamens. Flowers are solitary, attached by long, slender, hairless pedicels
Opposite, narrow, linear, greyish-green, with smooth margins. On smooth stems, square in cross-section
May to August