Bernard Castelein / Raft spider (Dolomedes fimbriatus) on Tansy (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium August

Ann & Steve Toon / Cornfield annual summer wildflowers growing on one of the plant charity Landlife's National Wildflower Farms, St Helens, Merseyside, UK, June.

Paul Harcourt Davies / Cornflowers (Centaurea cyanus) and poppies (Papaver rhoeas) growing on fallow fields near Orvieto, Umbria, Italy. June 2010

Paul Harcourt Davies,Paul Harcourt Davies / Cornflowers (Centaurea cyanus) growing on fallow fields near Orvieto, Umbria, Italy, June. Taken with fisheye lens

Diane McAllister / Cosmos (Cosmos bipinnatus), Bachelor buttons / Cornflowers (Centaurea cyanus), and Common poppies (Papaver rhoeas) in a small meadow. Nevada, USA, July

Bernard Castelein / Tansy (Tanacetum vulgare) flowering in grassland on misty morning, sun visible through trees. Peerdsbos, Brasschaat, Belgium. July 2018.

Bernard Castelein / Tansy (Tanacetum vulgare) flowering in grassland on misty morning, sun shining through trees. Peerdsbos, Brasschaat, Belgium. July 2018.

Nick Upton / Thongweed (Himanthalia elongata), young buttons in a rockpool. Near Falmouth, Cornwall, England, UK. September.

Robert Thompson / Black bulgar fungus (Bulgaria inquinans) growing amongst mosses, Tollymore Forest, County Down, Northern Ireland, UK. September.

Nick Upton / Black bulgar fungus (Bulgaria inquinans) growing from a rotting log in woodland, Gloucestershire, UK, October.

Nick Upton / Black bulgar fungus (Bulgaria inquinans) growing from a rotting log in woodland, Gloucestershire, UK, October.

Andy Sands / Black bulgar or Bachelor's Buttons (Bulgaria inquinans) a jelly fungus that grows on fallen Oak, Ash and other hardwood trees, Hertfordshire, Englkand, UK, September. Focus Stacked

Andy Sands / Black bulgar or Bachelor's Buttons (Bulgaria inquinans) a jelly fungus that grows on fallen Oak, Ash and other hardwood trees, Hertfordshire, Englkand, UK, September. Focus Stacked

Andy Sands / Black bulgar or Bachelor's Buttons (Bulgaria inquinans) a jelly fungus that grows on fallen Oak, Ash and other hardwood trees, Hertfordshire, Englkand, UK, September. Focus Stacked

MYN / Dirk Funhoff / Common tansy (Tanacetum vulgare), Büchelberg, Pfalz, Germany. September. Meetyourneighbours.net project

Bernard Castelein / Goldenrod crab spider (Misumena vatia) on Tansy (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium August

Bernard Castelein / Raft spider (Dolomedes fimbriatus) on Tansy (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium August

Rod Williams / Hoverfly (Sphaerophoria scripta) feeding on Tansy (Tanacetum vulgare) Brockley, Lewisham, London UK August

Rod Williams / Long hoverfly (Sphaerophoria scripta) feeding on Tansy (Tanacetum vulgare) flowers, Brockley, Lewisham, London, England, July.

Rod Williams / Long hoverfly (Sphaerophoria scripta) feeding on Tansy (Tanacetum vulgare) flowers, Brockley, Lewisham, London, England, July.

Rod Williams / Hoverfly (Sphaerophoria taeniata) feeding on Tansy (Tanacetum vulgare) flowers, Brockley, Lewisham, London, England, July.

Rod Williams / Two Seven-spot ladybirds (Coccinella septempunctata) feeding on Tansy (Tanacetum vulgare) Brockley, Lewisham, London, England, July.

Philippe Clement / Common tansy (Tanacetum vulgare) in flower, Belgium

Philippe Clement / Common tansy (Tanacetum vulgare) in flower, Belgium

Philippe Clement / Common tansy (Tanacetum vulgare) in flower, Belgium

Nick Upton / Black bulgar fungus (Bulgaria inquinans) growing on rotting oak log, GWT Lower Woods reserve, Gloucestershire, UK, October.

Nick Upton / Black bulgar fungus (Bulgaria inquinans) growing on rotting oak log, GWT Lower Woods reserve, Gloucestershire, UK, October.

Rod Williams / Tansy (Tanacetum vulgare) Ladywell Fields, Lewisham, South East London, England, UK, July

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) navel, close up. Fernandina Island, Galapagos, May.

Nick Upton / Sea thong (Himanthalia elongata) mature plants and juvenile 'buttons' exposed at low tide, Crail, Fife, UK, July

Nick Upton / Sea thong (Himanthalia elongata) mature plants and young 'buttons' exposed at low tide alongside a variety of red algae, with kelp beds in the background, Crail, Fife, UK, July

Nick Upton / Sea thong (Himanthalia elongata) mature plants and young 'buttons' exposed at low tide alongside a variety of red algae, with kelp beds in the background, Crail, Fife, UK, July

Nick Upton / Young Sea thong (Himanthalia elongata) 'buttons' on intertidal rocks exposed at low tide, Crail, Fife, UK, July

Nick Upton / Young Sea thong (Himanthalia elongata) 'buttons' on intertidal rocks exposed at low tide, Crail, Fife, UK, July

Nick Upton / Young Sea thong (Himanthalia elongata) 'buttons' on intertidal rocks exposed at low tide, Crail, Fife, UK, July

Nick Upton / Young Sea thong (Himanthalia elongata) 'buttons' on intertidal rocks exposed at low tide, Crail, Fife, UK, July

Benoit Stichelbaut / Crew trimming the sails with an electric winch aboard 118ft schooner "Magistral", 2002.

MYN / David Wong / Scaly Buttons (Leptorhynchos squamatus) flower head, Canberra, ACT, Australia, October. meetyourneighbours.net project

MYN / David Wong / Scaly Buttons (Leptorhynchos squamatus) flowers, Canberra, ACT, Australia, October. meetyourneighbours.net project

Bryan and Cherry Alexander / Three decorated buttons carved from mammoth ivory and used on traditional Dolgan clothing. Central Siberia, Russia.

Juergen Freund / Confiscated Samong top shells (Tectus / Trochus niloticus) used to make mother of pearl buttons and other objects. The species is CITES protected, and illegal fishermen often harvest the shells from T...

George McCarthy / Black bulgar / Batchelor's buttons fungus {Bulgaria inquinans} growing on bark of tree, UK

Juergen Freund / Blue buttons {Porpita porpita} various color morphs, Indo-pacific

Juergen Freund / Blue buttons {Porpita porpita} various color morphs, Indo-pacific

Duncan Mcewan / Batchelor's Buttons / Black Bulagar fungus (Bulgaria inquinans) on dead oak, Scotland

George McCarthy / Batchelor's buttons fungus / Black bulgar {Bulgaria inquinans} UK

Onne van der Wal / Electric winch buttons on the deck aboard cruising yacht. Rhode Island, USA.

Onne van der Wal / Electric winch buttons on the deck aboard cruising yacht. Rhode Island, USA.

Onne van der Wal / Foot buttons to control the electric winches aboard a superyacht.

Pascal Tordeux / Tansy / Mugwort / Bitter Buttons (Tanacetum vulgare) in flower. Picardy, France, July.

Axel Gomille / Poppies (Papaver rhoeas) and Cornflowers (Centaurea cyanus) in flower along edge of farmland, Mecklenburg-Western Pomerania, Germany. June.

Bernard Castelein / Raft spider (Dolomedes fimbriatus) resting on Tansy flowers (Tanacetum vulgare), Klein Schietveld, Brasschaat, Belgium. August.

Alan Williams / Buttonweed (Cotula coronopifolia), an invasive species native to South Africa and New Zealand, introduced to Europe and North America, covering the sandy beach at Hoylake, Wirral, Merseyside, UK. July...

Alan Williams / Buttonweed (Cotula coronopifolia), an invasive species native to South Africa and New Zealand, introduced to Europe and North America, growing on sandy beach at Hoylake, Wirral, Merseyside, UK. July.

Bernard Castelein / Two Crickets (Phaneroptera sp.) feeding on Tansy (Tanacetum vulgare) in the rain, Klein Schietveld Nature Reserve, Brasschaat, Belgium. August.

Philippe Clement / Plasterer bee / Davies' colletes (Colletes daviesanus) collecting pollen and pollinating Tansy (Tanacetum vulgare) in flower, Belgium. August.

Philippe Clement / Tansy / Common tansy (Tanacetum vulgare) in flower, Belgium. August.

Philippe Clement / Female European hoverfly (Helophilus pendulus) pollinating Tansy (Tanacetum vulgare) in flower, Belgium. August.

Philippe Clement / Female European hoverfly (Helophilus pendulus) pollinating Tansy (Tanacetum vulgare) in flower, Belgium. August.

Will Watson / Black bulgar (Bulgaria inquinans) on Sessile oak (Quercus petrea), Warren Wood, Herefordshire, England, November. Focus stacked.

Alex Hyde / Galls of the Silk Button gall wasp (Neuroterus numismalis) on the underside of an oak leaf. A single wasp will emerge from each gall. Neuroterus numismalis has two generations per year, the first sexu...

Alex Hyde / Galls of the Silk Button gall wasp (Neuroterus numismalis) on the underside of an oak leaf. A single wasp will emerge from each gall. Neuroterus numismalis has two generations per year, the first sexu...

Pal Hermansen / Tansy flowers (Tanacetum vulgare) Photograph taken with the Kirlian technique, a technique which allows imaging of electrical coronal discharge.

Dave Watts / Scaly buttons (Leptorhynchos squamatus). Tasmania, Australia. November.

Guy Edwardes / Black bulgar fungus (Bulgaria inquinans). Dorset, England, UK. October.

Guy Edwardes / Black bulgar fungus (Bulgaria inquinans). Dorset, England, UK. October.

Linda Pitkin / Black bulgar fungus (Bulgaria inquinans). Selsdon Wood Nature Reserve, Surrey, England, UK. October.

Paul Harcourt Davies / Aconite-leaved buttercup (Ranunculus aconitifolius). Dolomites, Italy. June.

Nigel Cattlin / Oxeye daisies (Chrysanthemum vulgare) a single flower in a group of daisies with white ray and yellow disc florets, Berkshire, England, UK, June

Linda Pitkin / Tansy (Tanacetum vulgare) on bank of River Thames. Hampton Wick, Richmond Upon Thames, England, UK. July.

Linda Pitkin / Bachelor's buttons fungus (Bulgaria inquinans), Abinger Roughs NT, Surrey, England, October

David Hall / Lined chiton (Tonicella lineata) with Orange Social Tunicates (Metandrocarpa taylori) and pale orange-yellow California sea pork (Aplidium californicum), Browning Pass, Queen Charlotte Strait, British...