Anagallis tenella, the bog pimpernel is an evergreen perennial  member of the family Primulaceae with creeping stems that root at the nodes when they come into contact with the soil surface. Native to western Europe including England, in damp turf, bogs and beside ponds and lakes. The cultivar 'Studland' was collected in Dorset and has flowers a deeper shade of pink than the more normal forms found.

A. tenella can be found under a number of synonyms - A. palustris (swampy or marshy) showing its liking for damp, boggy places, A. repens ( creeping or crawling) showing its typical growth habit and A. serpyllifolia ( thyme-leaved) describing its folial similarity to Thyme. The flowers which are tubular at the base with five spreading lobes to at least half the corolla length, tend to open in sunshine, closing by late afternoon. A useful pot-plant for late Spring/early Summer shows - below is a plant from the 2011 Summer Show Mid-west shown by Brian Russ