Albert Lleal / Poinsettia (Euphorbia pulcherrima) leaf, 5x magnification, showing rib and veination, Barcelona, Spain

Albert Lleal / Poinsettia (Euphorbia pulcherrima) leaf, 2x magnification, showing rib and veination, Barcelona, Spain

Pete Oxford / Amerindian woman, Winifred Brown, model released, using a Matape to strain liquid from mashed Cassava to make Cassava flour, Katoka, Rupununi, Guyana, February 2010. Model released

Pete Oxford / Macushi woman preparing cassava bread from Cassava / Yuca (Manihot esculenta), crop is harvested, peeled, grated, squeezed to a matape, sieved, and roasted into a large flat piece of bread, Fairview...

Wild Wonders of Europe / della Ferrera / Marsh spurge (Euphorbia palustris) flowering in water, Northern part of Livanjsko Polje, Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Lilja / Greek spiny spurge (Euphorbia acanthothamnos) Imbros, Crete, Greece, April 2009

Wild Wonders of Europe / Lilja / Tree spurge (Euphorbia dendroides) plants in flower, Topolia, Crete, Greece, April 2009

Wild Wonders of Europe / Lilja / Tree spurge (Euphorbia dendroides) flowers, Topolia, Crete, Greece, April 2009

Wild Wonders of Europe / Benvie / Crab spider (Misumena sp) on Euphorbia, Queyras, France, June 2009

Wild Wonders of Europe / Relanzón / Sweet tabaiba / Tabaiba dulce (Euphorbia balsamifera) growing on cliff top, Punta Gorda coast protected area, Northwest La Palma, Canary Islands, Spain, March 2009

Luiz Claudio Marigo / Candelabra trees {Euphorbia candelabrum} Lake Nakuru NP, Kenya

Luiz Claudio Marigo / Candelabra trees {Euphorbia candelabrum} Lake Nakuru NP, Kenya

Mark Moffett / Dicot (Omphalea sp) vine tendril wrapping around supporting branch in tropical rainforest, Barro Colorado Island, Panama

Nigel Cattlin / Dog's mercury (Mercurialis perennis). Berkshire, England, UK. April.

Heather Angel / Day gecko (Phelsuma sp.) with extended tongue lapping up nectar from crown of thorns (Euphorbia milii) flower, Madagascar

Nick Upton / Large Mediterranean spurge (Euphorbia characias characias) flowering amongst limestone boulders. Supramonte mountain range, near Urzulei, Sardinia, Italy. June.

Heather Angel / Monarch butterflies (Danaus plexippus), three nectaring on Poinsettia (Euphorbia pulcherrima), resting on red bracts. In butterfly house, Xishuangbanna, Yunnan Province, China.

Heather Angel / Ant (Formicidae sp) feeding on Euphorbia (Euphorbia atropururea), pollen on head. Tenerife, Canary Islands.

Heather Angel / Euphorbia (Euphorbia jolkinii) leaves turning red in autumn. Napa Hai, Shangri-la, Yunnan Province, China. September.

Heather Angel / Euphorbia (Euphorbia jolkinii) leaves turning red in autumn. Napa Hai, Shangri-la, Yunnan Province, China. September.

Duncan Murrell / Ants with symbiotic relationship with Mahang bitik (Macaranga maingaiyi), Sabangau (peat-swamp) Forest, Kalimantan, Indonesia.Ants live inside its hollow stem. In return, these ants kill and eat other...

Nick Upton / King Juba's spurge (Euphorbia regis-jubae), flowering below Famara cliffs, Lanzarote, Canary Islands, February.

Nick Upton / King Juba's spurge (Euphorbia regis-jubae) and Balsam spurge (Euphorbia balsamifera), flowering below Famara cliffs, Lanzarote, Canary Islands, February.

Nick Upton / Balsam spurge / Sweet tabaiba (Euphorbia balsamifera) bushes growing on ancient lava flows with Monte Corona volcanic peak in the background, Malpais de la Corona, Lanzarote, Canary Islands, February.

Nick Upton / Balsam spurge / Sweet tabaiba (Euphorbia balsamifera) bushes growing on ancient lava flows with Monte Corona volcanic peak in the background, Malpais de la Corona, Lanzarote, Canary Islands, February.

Pedro Narra / Lioness (Panthera leo) resting in Candelabra euphorbia (Euphorbia ingens) tree, Queen Elizabeth NP, Uganda.

Andy Sands / Wood spurge (Euphorbia amygdaloides) Close up of flowers ancient woodland indicator species, Hertfordshire, England, UK, April. Focus Stacked

Robin Chittenden / Portland spurge (Euphorbia portlandica), Dorset, UK. April.

Ernie Janes / Rubber tree (Hevea brasiliensis) tapping with bucket full of latex, Thailand.

Ernie Janes / Rubber tree (Hevea brasiliensis) tapping with bucket full of latex, Thailand.

Ernie Janes / Rubber tree (Hevea brasiliensis) tapping with bucket full of latex, Thailand.

Eric Baccega / African fish eagle (Haliaeetus vocifer) perched on euphorbia, Queen Elizabeth National Park, Uganda.

Eric Baccega / African fish eagle (Haliaeetus vocifer) perched on euphorbia, Queen Elizabeth National Park, Uganda.

Nick Upton / Jandia spurge / Cardon de Jandia (Euphorbia handiensis) a rare Red Data Book listed Fuertventuran endemic plant found only in two valleys in the far south of the island, Barranco Gran Valle, Jandia pe...

Nick Upton / Jandia spurge / Cardon de Jandia (Euphorbia handiensis) a rare Red Data Book listed Fuerteventuran endemic plant found only in two valleys in the far south of the island, Barranco Gran Valle, Jandia p...

Nick Upton / Jandia spurge / Cardon de Jandia (Euphorbia handiensis) a rare Red Data Book listed Fuertventuran endemic plant found only in two valleys in the far south of the island, Barranco Gran Valle, Jandia pe...

Kim Taylor / Cypress spurge (Euphorbia cyperissias), Apennines, Italy. Apennines, Italy, May.

Chris Mattison / Pencil milkbush (Euphorbia mauritanica) growing among Quiver trees (Aloidendron dichotomum), near Leliesfontein, Namaqualand, South Africa

Chris Mattison / Pencil milkbush (Euphorbia mauritanica) growing among Quiver trees (Aloidendron dichotomum), near Leliesfontein, Namaqualand, South Africa

Jean E. Roche / Euphorbia (Euphorbia sp.) plants growing after fire, Etang de Berre, Provence, France

Jean E. Roche / Painted euphorbia (Euphorbia linifolia) Pomegues Island, Frioul Archipelago, Marseille, France April.

Robert Thompson / Sea spurge (Euphorbia paralias) Ballywhoriskey Point, Co. Donegal, Northern Ireland. October.

Dong Lei / Wild Euphorbia flowers, Sanjiangyuan National Nature Reserve, Qinghai Hoh Xil UNESCO World Heritage Site, Qinghai-Tibet Plateau, Qinghai Province, China.

Ernie Janes / Garden flowers, Bergenia 'Overture' and Spurge (Euphorbia characias subsp. characias) 'Humpty Dumpty' England, UK.

Ernie Janes / Spurge (Euphorbia characias subsp. wulfenii) in garden with Tulips (Tulipa) and urn, England, UK.

Ernie Janes / Wallflowers (Erysimum) 'Bowles's Mauve' and Spurge (Euphorbia characias subsp. characias) 'Humpty Dumpty' in flower in garden. England, UK.

Ernie Janes / Mediterranean spurge (Euphorbia characias) and Hyacinths in flower growing in container pots, Norfolk, England, UK, March.

Ernie Janes / Cultivated garden tulips (Tulipa) with raindrops and Spurge (Euphorbia) in the background in garden. England, UK.

Sue Daly / Sea spurge (Euphorbia paralias) Sark, British Channel Islands, May.

Adrian Davies / Sandbox tree (Hura crepitans) detail of bark, Trinidad.

Loic Poidevin / Grove Snail (Cepaea nemoralis) on Mediterranean spurge (Euphorbia characias) flower, Vendee, France, April

Ingo Arndt / Savanna with candelabra tree (Euphorbia candelabrum) termite mounds, safari vehicle and rainbow, Masai Mara Game Reserve, Kenya, Africa

Ingo Arndt / Savanna with Candelabra Tree (Euphorbia candelabrum) termite mounds, safari vehicle and rainbow, Masai Mara Game Reserve, Kenya, Africa

Constantinos Petrinos / Large Mediterranean spurge (Euphorbia characias) Mount Pelion, Greece, March 2008.

Ann & Steve Toon / Lebombo euphorbia (Euphorbia confinalis), Kruger national Park, South Africa. Vulnerable species.

Fabrice Cahez / Euphorbia flower (Euphorbia amygdaloides) covered in morning dew, Vosges forest, France, May.

Paul Harcourt Davies / Spurge hawkmoth (Hyles euphorbiae) Italy. September.

Enrique Lopez-Tapia / Rubber tree (Hevea brasiliensis) tapping from a plantation within the limits of Gunung Leuser National Park, Indonesia, UNESCO World Heritage site, November.

Nick Upton / Castor oil plant (Ricinus communis) with red female and white male flowers, Gran Canaria, Canary Islands, June.

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stand on volcanic coastal mountains of the Tamadaba Natural Park. Gran Canaria UNESCO Biosphere Reserve, Gran Canaria, Canary Islands. June...

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stands and other Euphorbias among volcanic rocks in the coastal mountains of the Tamadaba Natural Park. Gran Canaria UNESCO Biosphere Reser...

Claudio Contreras / Manchineel Tree (Hippomane mancinella), Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean,...

Claudio Contreras / Spurge (Euphorbia anthonyi), Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, Western Me...

Claudio Contreras / Spurge (Euphorbia anthonyi) on lava, Clarion Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, We...

Philippe Clement / Female flowers of Castorbean / Castor-oil-plant (Ricinus communis) native to the southeastern Mediterranean Basin, Eastern Africa, and India, July.

Jen Guyton / Man selling mandioca, or cassava root, on the side of the road near Nampula, Mozambique. June 2011

Alan Williams / Sea Spurge (Euphorbia paralias), Dee Estuary, Hoylake, Wirral, UK, June.

Alan Williams / Sea Spurge (Euphorbia paralias), Dee Estuary, Hoylake, Wirral, UK, June.

Daniel Heuclin / Chips of Manioc (Manihot esculenta) drying, Sumatra. July 2016.

Daniel Heuclin / Chips of Manioc (Manihot esculenta) drying, Sumatra. July 2016.

Edwin Giesbers / Succulent (Euphorbia ferox) occurs in South Africa. Botanic Garden Amsterdam, the Netherlands, August 2013.

Lorraine Bennery / Spurge hawkmoth caterpillar (Hyles euphorbiae) on one of its foodplants (Euphorbia sp.), Loire river, France, September.

Yva Momatiuk & John Eastcott / Spurge (Euphorbia virosa) cactii, Namib Desert, Namibia

Adrian Davies / Berthelot's spurge (Euphorbia berthelotii) La Gomera, Canary Islands. Endemic to La Gomera.

Adrian Davies / Berthelot's spurge (Euphorbia berthelotii) La Gomera, Canary Islands. Endemic to La Gomera.

Adrian Davies / Berthelot's spurge (Euphorbia berthelotii) La Gomera, Canary Islands. Endemic to La Gomera.

Martin Gabriel / Euporbia handiensis, an endangered Euphorbia species endemic to the southern part of Fuerteventura, growing in its natural environment, Fuerteventura, Canary Islands, Spain

Martin Gabriel / Euporbia handiensis, an endangered Euphorbia species endemic to the southern part of Fuerteventura, growing in its natural environment, Fuerteventura, Canary Islands, Spain

Martin Gabriel / Euporbia handiensis, an endangered Euphorbia species endemic to the southern part of Fuerteventura, Canary Islands, Spain

Martin Gabriel / Euphorbia handiensis, an endangered Euphorbia species endemic to the southern part of Fuerteventura, Canary Islands, Spain, December.

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stand with many seed pods, Tenerife, May.

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stand with many seed pods, Tenerife, May.

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stand with many seed pods, Tenerife, May.

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stand with many seed pods in coastal scrubland, Tenerife, May.

Nick Upton / Canary Island spurge / Hercules club (Euphorbia canariensis) stand with many seed pods, Tenerife, May.

Chris Mattison / Canary / Honey spurge (Euphorbia mellifera) La Gomera, Canary Islands, Spain

Chris Mattison / Cardon (Euphorbia canariensis) and other succulent plants, growing on lava flow, Punta de Teno, Tenerife, Canary Islands, Spain.

Chris Mattison / Sweet / Balsam spurge (Euphorbia balsamifera) growing on lava flow, Punta de Teno, Tenerife, Canary Islands, Spain.

Chris Mattison / Cardon (Euphorbia canariensis) Punta de Teno, Tenerife, Canary Islands, Spain

Stephen Dalton / Wood spurge (Euphorbia amygdaloides) Sussex, UK

Nick Upton / Broad-leaved Glaucous Spurge / Myrtle spurge (Euphorbia myrsinites) flowering on limestone mountain top, Mount Olympus, Lesbos, Greece, May 2013.

Nick Upton / Broad-leaved Glaucous Spurge / Myrtle spurge (Euphorbia myrsinites) flowering on limestone mountain top, Mount Olympus, Lesbos, Greece, May 2013.

Nick Upton / Broad-leaved Glaucous Spurge / Myrtle spurge (Euphorbia myrsinites) clumps flowering on limestone mountain top, Mount Olympus, Lesbos, Greece, May 2013.

Mike Read / Wood spurge (Euphorbia amygdaloides) Garston Wood RSPB reserve near Shaftesbury, Dorset UK May

Michael Hutchinson / Petty spurge (Euphorbia peplus) growing through tarmac, Bristol, UK, January.

Pete Oxford / Cassava (Manihot esculenta) roots being washed by Wai-wai woman, Guyana