Edwin Giesbers / Star clover (Trifolium stellatum) flower with pink flower in background, Menorca, Balearic Islands, Spain

Edwin Giesbers / Star clover (Trifolium stellatum) flower, Menorca, Balearic Islands, Spain, Europe

Wild Wonders of Europe / Benvie / Haresfoot clover (Trifolium arvense) in flower, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Wild Wonders of Europe / Schandy / Alibek glacier in Alibek vally with Purple trefoil (Trifolium) growing in the foreground, near Dombay, Caucasus, Russia, July 2008

Michael Durham / Honey Bee (Apis mellifera) worker collecting nectar from Red Clover (Trifolium pratense) flowers, note the pollen baskets on the legs, northwest Oregon

Paul Harcourt Davies / Species rich alpine meadow including Sainfoin (Onobrychis arenaria), Meadow clary (Salvia pratensis), Clovers (Trifolium spp), Hoary plantain (Plantago media), Bird's-foot trefoil (Lotus sp) and Y...

Paul Harcourt Davies / Species rich alpine meadow with flowers including Meadow clary (Salvia pratensis), Yellow rattle (Rhinathus sp), Sainfoin (Onobrychis arenaria), Bird's-foot trefoil (Lotus sp), Clover (Trifolium s...

Paul Harcourt Davies / Species rich alpine meadow with flowers including Meadow clary (Salvia pratensis), Yellow rattle (Rhinathus sp), Sainfoin (Onobrychis arenaria), Bird's-foot trefoil (Lotus sp), Clover (Trifolium s...

Paul Harcourt Davies / Species rich alpine meadow with flowers including Meadow clary (Salvia pratensis), Yellow rattle (Rhinathus sp), Oxeye daisy (Leucanthemum vulgare), Clover (Trifolium sp) and Bird's-foot trefoil (...

Mike Read / Mountain clover (Trifolium montanum) and Bird's-foot trefoil (Lotus sp). Alpine meadow, Plateau de Beurre, Vercors Regional Natural Park, France. June.

Robert Thompson / Gypsy moth (Lymantria dispar) caterpillar on Clover (Trifolium sp) flower. Catlar, Pyrenees Orientales, south west France. May.

Phil Savoie / Buff tailed bumblebee (Bombus terrestris)taking off from Clover (Trifolium sp.) Monmouthshire Wales UK, June.

Phil Savoie / Buff tailed bumblebee (Bombus terrestris) flying to Clover (Trifolium sp.), Monmouthshire, Wales, UK, June.

Phil Savoie / Buff tailed bumblebee (Bombus terrestris), Clover (Trifolium sp.), Monmouthshire, Wales, UK, June.

Phil Savoie / Buff tailed bumblebee (Bombus terrestris) flying to Clover (Trifolium sp.) flowers, in unmown lawn, Monmouthshire, Wales, UK, June.

Phil Savoie / Clover (Trifolium sp) flowers in unmown lawn, Monmouthshire, Wales, UK, June.

Phil Savoie / Clover (Trifolium sp) flowers in unmown lawn, Monmouthshire, Wales, UK, June.

Phil Savoie / Clover (Trifolium sp) flowers in unmown lawn, Monmouthshire, Wales, UK, June.

Phil Savoie / Buff tailed bumblebee (Bombus terrestris) flying to Clover (Trifolium sp.) in unmown meadow, Monmouthshire, Wales, UK. June.

MYN / Paul Harcourt Davies / Star Clover (Trifolium stellatum) fruiting heads, near Ferla, Sicily. May. Meetyourneighbours.net project

Wild Wonders of Europe / Widstrand / Narrow-leaved crimson clover (Trifolium angustifolium) Velebit Nature Park, Rewilding Europe area, Velebit mountains, Croatia

Colin Varndell / White clover flowers (Trifolium sp) Dorset, UK June

Alex Hyde / White Clover (Trifolium repens) against a white background. Peak District National Park, UK. September.

Colin Varndell / Hop trefoil (Trifolium campestre) flowering, Dorset, UK, July

MYN / Marko Masterl / Mountain clover (Trifolium montanum) in flower, Slovenia, Europe, June. meetyourneighbours.net project

MYN / Carsten Krieger / White Clover (Trifolium repens) flower, County Clare, Ireland, August. meetyourneighbours.net project

Ernie Janes / Meadow cranesbill (Geranium pratense) Lady's mantle (Alchemilla sp) and Clover (Trifolium sp) flowering, Norfolk, UK, July

Colin Varndell / Haresfoot Clover (Trifolium) in bloom. Norfolk, UK, July.

Wild Wonders of Europe / Wothe / Four Clover (Trifolium montanum) flowers, Poloniny National Park, Western Carpathians, Slovakia, Europe, May 2009

Adam Burton / Field of flowering clover (Trifolium) near Copplestone in rural Devon, England.

Shattil & Rozinski / Dwarf clover {Trifolium nanum} flowering on alpine tundra, Colorado, USA

Shattil & Rozinski / Alpine clover {Trifolium dasyphyllum} flowering on alpine tundra, Colorado, USA

Philippe Clement / Zigzag clover in flower {Trifolium medium} Belgium

Philippe Clement / Zigzag clover flower {Trifolium medium} Belgium

Aflo / N-2310 Four leaf clover leaf {Trifolium}

Aflo / N-2309 Four leaf clover leaves {Trifolium sp}

Aflo / N-1703 Water droplets on Clover leaves {Trifolium sp}

Aflo / N-2206 Four leaf clover {Trifolium sp}

Georgette Douwma / Four leaved clover - digitally manipulated image

Pascal Tordeux / White Sweet Clover (Melilotus alba) Picardy, France, July.

Visuals Unlimited / Four leaf clover.

Nigel Cattlin / Leaf Spot (Pseudopeziza sp) on White Clover leaves (Trifolium repens).

Visuals Unlimited / Cross-section of a young Clover stem (Trifolium sp) showing vascular bundles. LM X20

Visuals Unlimited / Cross-section of a mature Clover stem (Trifolium sp). LM X10.

Visuals Unlimited / Cross-section of a mature Clover stem (Trifolium sp). LM X10.

Robin Chittenden / Niobe fritillary butterfly (Argynnis niobe) on Clover (Trifolium sp) flower, Pyrenees, France, July

Walter Soestbergen/ BIA / Banded Demoiselle (Calopteryx splendens) on Clover (Trifolium sp) flower, Utrecht, Netherlands