Nick Upton / Horseshoe vetch (Hippocrepis comosa) flowering in a chalk grassland meadow, Wiltshire, UK, May.

Nick Upton / Horseshoe vetch (Hippocrepis comosa) flowering in a chalk grassland meadow, Wiltshire, UK, May.

Nick Upton / Horseshoe vetch (Hippocrepis comosa) flowering in a chalk grassland meadow, Wiltshire, UK, May.

MYN / Dirk Funhoff / Horseshoe vetch (Hippocrepis comosa) flower, Lorsch, Hessen, Germany. June. Meetyourneighbours.net project

MYN / Dirk Funhoff / Horseshoe vetch (Hippocrepis comosa), Lorsch, Hessen, Germany. Meetyourneighbours.net project

Philippe Clement / Horseshoe vetch (Hippocrepis comosa) in flower showing red and orange early stage, Gran Paradiso National Park, Italy, June

Daniel Heuclin / Horseshoe whip snake (Hemorrhois hippocrepis) coiled, Souss, Morocco.

Daniel Heuclin / Horseshoe whip snake (Hemorrhois hippocrepis) portrait, Souss, Morocco.

Daniel Heuclin / Horseshoe whip snake (Hemorrhois hippocrepis) coiled, Morocco.

Luis Quinta / Horseshoe whip snake (Coluber hippocrepis) Portugal, April.

Nick Upton / Germander speedwell (Veronica chamaedrys) flowering in a chalk grassland meadow, with defocused Horsehoe vetch flowers (Hippocrepis comosa) in the background, Wiltshire, UK, May.

Alex Mustard / A portrait of a horseshoe leatherjacket (Meuschenia hippocrepis) Kangaroo Island, South Australia, Australia. Investigator Strait, Great Australian Bight.