Marsh Lousewort
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Pedicularis palustris
Common & widespread in Britain.
The flower is reddish-purple and up to 2.5 cm (1 in) long, with five petals fused into a tube, the upper lip being slightly shorter than the lower lip.
The fruit is a capsule.
The other subspecies, Pedicularis palustris subsp. karoi, which occurs in the east of the range, is an annual plant and has smaller flowers.
This species can be distinguished from Common Lousewort (Pedicularis sylvatica) by having two calyx lobes rather than four, and four small teeth at the tip of the upper lip rather than two.
It is also taller and more erect, and is found in wetter locations.
Flowers from May-September.