Still wondering - slender marsh bedstraw?? help needed please!

Still wondering - slender marsh bedstraw?? help needed please!

Observation - Still wondering - slender marsh bedstraw?? help needed please! - UK and Ireland. Description: OK, have keyed this out with rose but not confident of the outcome. Very slender bedstraw approx to 30cm. Stems slightly rough. Flowers both 4 and 5 lobed, white, appox 3mm across. Leaves no more than 1cm long, single veined, mostly in 4s, not mucronate w

OK, have keyed this out with rose but not confident of the outcome. Very slender bedstraw approx to 30cm. Stems slightly rough. Flowers both 4 and 5 lobed, white, appox 3mm across. Leaves no more than 1cm long, single veined, mostly in 4s, not mucronate with tiny forward facing prickles along edges. Suggested distribution does not include Wales though & nationally rare?? Habitat is right - growing in damp meadow.