Alopecurus geniculatus is a species of grass known by the common name water foxtail or marsh foxtail.
It is native to much of Eurasia and introduced into North America, South America, and Australia. It grows in moist areas.
Environmental conservation
Alopecurus geniculatus is a component of purple moor grass and rush pastures a type of Biodiversity Action Plan habitat in the UK. It occurs on poorly drained neutral and acidic soils of the lowlands and upland fringe. == Nonindigenous spread ==
Nonindigenous spread
The grass has spread significantly in the United States since it was first introduced. == Hybrid ==
Hybrid
Alopecurus geniculatus is known to hybridize with other members of the Alopecurus genus. Alopecurus x haussknechtianus is a hybrid between A. geniculatus and A. aequalis, Alopecurus x brachystylus is a hybrid between A. geniculatus and A. pratensis, Alopecurus x plettkei is s hybrid between A. geniculatus and A. bulbosus (Botanical Society of Britain and Ireland 2016). ==References==