Fabrice Cahez / Field cow-wheat (Melampyrum arvense) in flower, Vosges, France, May.

Fabrice Cahez / Field cow-wheat (Melampyrum arvense) in flower, Vosges, France, May.

Paul Harcourt Davies / Field cow-wheat (Melampyrum arvense) Campo Imperatore, Abruzzo, Italy June 2016

Paul Harcourt Davies / Field cow-wheat (Melampyrum arvense) Campo Imperatore, Abruzzo, Italy June.

Sven Zacek / Carpet of Wood cow-wheat (Melampyrum nemorosum) in a spruce grove, Valgamaa, Estonia, July.

MYN / Dirk Funhoff / Field Cow-wheat (Melampyrum arvense), Ilbesheim, Rhineland-Palatinate, Germany, May. meetyourneighbours.net project

Terry Whittaker / Heath fritillary butterfly (Melitaea athalia) on Common cow-wheat (Melampyrum pratense) a larval food plant, Blean Woods, Kent, UK, July.

Terry Whittaker / Heath fritillary butterfly (Melitaea athalia) on Common cow-wheat (Melampyrum pratense) Blean Woods, Kent, UK, July.

Wild Wonders of Europe / Bartocha / Cow wheat (Melampyrum nemorosum)flower, Carpathian Mountains, Romania, August

MYN / Marko Masterl / Wood cow-wheat (Melampyrum nemorosum) in flower, Slovenia, Europe, July. meetyourneighbours.net project

Ernie Janes / Field cow wheat (Melampyrum arvense) flowering, Chilterns, Buckinghamshire, UK, June

Andy Sands / Field Cow Wheat (Melampyrum arvense) growing abundantly among poppies - Field Cow Wheat is a rare arable weed. Bedfordshire, England, June.

Andy Sands / Field Cow Wheat (Melampyrum arvense) growing at edge of cornfield. This species is a rare, arable weed. Bedfordshire, England, UK, June.

Ernie Janes / Field cow-wheat (Melampyrum arvense) flowers amongst Feverfew, UK

Ernie Janes / Field cow-wheat (Melampyrum arvense) flowers in grassland, rare flower, Buckinghamshire, UK

Ernie Janes / Seeds of Field cow wheat (Melampynum arvense) collected, very rare flower, UK

Ernie Janes / Botanist extracting seed from Field Cow Wheat (Melampyrum sp) which is nearly extinct in UK

Andy Sands / Field Cow wheat (Melampyrum arvense) close up of flowers, growing at edge of cornfield. This species is a rare, arable weed. Bedfordshire, England, UK, May

Andy Sands / Field Cow wheat (Melampyrum arvense) in flower at edge of cornfield. This species is a rare, arable weed. Bedfordshire, England, UK, May

Andy Sands / Field Cow wheat (Melampyrum arvense) in flower at edge of cornfield. This species is a rare, arable weed. Bedfordshire, England, UK, May

Andy Sands / Heath Fritillary (Melitaea athalia) one of the rarest British butterflies, on flower of Cow-wheat (foodplant), Kent, England, UK

Andy Sands / Heath Fritillary (Melitaea athalia) one of the rarest British butterflies, on flower of Cow-wheat (foodplant), Kent, England, UK

Gary K. Smith / Common cow wheat {Melampyrum pratense} May, UK

Philippe Clement / Crested cow wheat {Melampyrum cristatum} La Brenne, France.

Philippe Clement / Field cow wheat flowering in field {Melampyrum arvense} France

Philippe Clement / Field cow wheat flower {Melampyrum arvense} France

Staffan Widstrand / Field cow-wheat (Melampyrum arvense) in flower, Gelderse Poort, near Nijmegen, The Netherlands. July.

Sven Zacek / Wood cow-wheat (Melampyrum nemorosum) in bloom in Karula National Park, Valgamaa county,Southern Estonia.