Nick Upton / Three racehorses in training, racing along gallops past fields of flowering Linseed (Linum usitatissimum), Marlborough Downs, Wiltshire, UK, July.

Paul Harcourt Davies / Yellow Flax (Linum capitatum) in flower, in canyon on Campo Imperatore, Gran Sasso, Appennines, Abruzzo, Italy

Paul Harcourt Davies / Perennial Flax (Linum narbonsense ) in flower, Gran Sasso, Appennines, Abruzzo, Italy, May

Paul Harcourt Davies / Yellow flax (Linum flavum) in flower, by a wall. Apennine mountains, Italy, Europe.

Paul Harcourt Davies / Yellow flax (Linum flavum) flowering in Apennine mountains, Italy, Europe.

Wild Wonders of Europe / Lilja / Tree flax (Linum arboreum) in flower, Imbros, Crete, Greece, April 2009

David Noton / Flax {Linum usitatissimum} Dorset, England, UK

Tim Fitzharris / Blue Flax (Linum perenne) flowers, North America

Tim Fitzharris / Blue Flax (Linum perenne) flowers, North America

Mark Hughes / Tui (Prosthemadera novaeseelandiae) feeding on flax nectar, Karori Wildlife Sanctuary, Wellington, New Zealand

Pascal Tordeux / Narrow Leafed Flax (Linum tenuifolium). French Alps, June.

Yva Momatiuk & John Eastcott / Common Flax (Linum usitatissimum) growing in wetland, Mount Aspiring National Park, South Island, New Zealand