Orange Foxtail - Alopecurus aequalis
Often decumbent, it has 'kneed' L shaped stems that grow parallel to the ground before turning upwards. The lemma has a very short awn that is included in the glumes or very slightly protruding. Anthers are bright orange.
Marsh Foxtail has longer awns which are sometimes bent and the anthers are not such a vivid orange colour.

Detailed photographs required showing awns and anthers if in flower.
Most frequent on drying mud but found in a wide variety of habitats associated with freshwater, including the margins of ponds, ditches, reservoirs and flooded gravel-pits. It has also recently been found as a weed in aquatic garden centres.
Flowering June to September.
Annual.
It seems to be fairly widespread in England, but less frequently recorded elsewhere in Britain.
Scarce or under recorded in Leicestershire and Rutland.
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015