Some similarities to : Marsh Stitchwort (Stellaria palustris) which also likes wet ground, but that grows in base-rich (alkaline) soils such as fens and wet lowland grassland (rather than having a preference for acidic soils). Marsh Stitchwort is slightly longer at 60cm (rather than 40cm) and has linear-lanceolate leaves (rather than elliptic/oval) and the petals are longer than the sepals (or just slightly longer) rather than shorter. Moreover, the petals, although cleaved almost to the base, are so angled as to appear as 10 evenly-spaced petals (rather than split so wide apart that adjacent petal halves almost meet).

Slight resemblance to : Water Chickweed (Myosotion aquaticum) but that is usually far bigger at 20-100cm (rather than the 5-20cm of Bog Stitchwort), grows in wettish basic soils (rather than much preferring acidic soils).

Has characters which are intermediate between Stitchworts and Chickweeds. A native perennial plant often found on acid soils in mires and bogs, in ditches or depressions, on wet tracks, or beside streams. Either decumbent or ascending. The size of the flowers is variable; in some conditions they are much smaller than others!