Nigel Cattlin / Black grass (Alopecurus myosuroides) growing as agricultural weed amongst Winter wheat (Triticum aestivum) crop. Berkshire, England, UK. May.

Nigel Cattlin / Black grass (Alopecurus myosuroides) growing as agricultural weed amongst Winter wheat (Triticum aestivum) crop. Berkshire, England, UK. May.

Nigel Cattlin / Black grass (Alopecurus myosuroides) growing as agricultural weed amongst Winter wheat (Triticum aestivum) crop. Berkshire, England, UK. May 2016.

Nigel Cattlin / Black grass (Alopecurus myosuroides) growing as agricultural weed amongst Winter wheat (Triticum aestivum) crop. Berkshire, England, UK. May.

Nigel Cattlin / Blackgrass (Alopecurus myosuroides) flowering spikes growing as weed amongst Winter wheat (Triticum aestivum) crop. Berkshire, England, UK. June.

Nigel Cattlin / Blackgrass (Alopecurus myosuroides) amongst annual arable weeds, growing after Barley (Hordeum vulgare) crop harvest.

Nigel Cattlin / Meadow foxtail (Alopecurus pratensis), three flower spikes with anthers and stamens.

Ingo Arndt / Squirreltail Barley (Hordeum jubatum) grasses, Patagonia, Argentina

Rod Williams / Meadow foxtail (Alopecurus pratensis) Sutcliffe Park Nature Reserve, Eltham, London. May

Matthew Maran / Meadow foxtail / Foxtail grass (Alopecurus pratensis) Hampstead Heath, London, England, UK. June.

Simon Colmer / Marsh foxtail (Alopecurus geniculatus) flower, Sussex, UK. June.

Pascal Tordeux / Meadow Foxtail / Foxtail Grass (Alopecurus pratensis) flowering, a perennial grass. Picardie, France, May.

Kevin Schafer / Tickseed (Coreopsis calliopsidea) and Foxtail (Vulpia sp), Carrizo Plain National Monument, California

Tim Fitzharris / Indian Paintbrush (Castilleja coccinea) and Foxtail Barley (Critesion jubatum) field, Texas

Tim Fitzharris / Squirreltail Barley (Hordeum jubatum) among wind and rain eroded tufa towers, Mono Lake, California

Tim Fitzharris / Squirreltail Barley (Hordeum jubatum) and Tufa Towers silhouetted at dawn, Mono Lake, California

TOM MANGELSEN / Yarrow {Achillea millefolium} and foxtail grass, Grand Teton NP, Wyoming, USA

Tim Fitzharris / Paintbrush (Castilleja sp) and Bulbous Barley (Hordeum murinum), Hill Country, Texas

Linda Pitkin / Marsh foxtail (Alopecurus geniculatus) in flower. Surrey, UK. July.

Nigel Cattlin / Blackgrass (Alopecurus myosuroides) seedling, arable annual grass weed with a single tiller.

Nigel Cattlin / Green foxtail (Setaria viridis) bowing heads of flowering grass weeds in a Soybean (Glycine max) crop, Illinois, USA.

Linda Pitkin / Meadow foxtail (Alopecurus pratensis), in a meadow, Horton Country Park, Surrey, England, May.

Linda Pitkin / Orange foxtail (Alopecurus aequalis), locally rare plant, at edge of pond, Nore Hill, Surrey, England, June.

Linda Pitkin / Meadow foxtail (Alopecurus pratensis) in flower, Horton Country Park, Epsom, Surrey, England, May.

Nigel Cattlin / Meadow foxtail (Alopecurus pratensis) in a group in grassland, Berkshire, England, UK, May

Nigel Cattlin / Meadow foxtail (Alopecurus pratensis) in a group in grassland, Berkshire, England, UK, May