Jeff Foott / Indian Rhubarb (Darmera peltata) growing on rock in river, Cascade Creek, Yosemite National Park, California

Cyril Ruoso / Chacma Baboon (Papio ursinus) stealing rhubarb from shopper, Cape Town, South Africa. Sequence 2 of 6

Nigel Cattlin / Butterbur (Petasites hybridus) flowering on bank of Kennet and Avon Canal, near Hungerford, Berkshire, England, UK. April.

Nigel Cattlin / Butterbur (Petasites hybridus), on bank of Kennet and Avon Canal, Hungerford, Berkshire, England, UK. March.

Nigel Cattlin / Butterbur (Petasites hybridus), on bank of Kennet and Avon Canal, Hungerford, Berkshire, England, UK. March.

Juan Manuel Borrero / Carvao aqueduct with Chilean rhubarb (Gunnera tinctoria) at base. Devasa mountain range, Sao Miguel Island, Azores, Portugal. 2019.

Juan Manuel Borrero / Chilean gunnera (Gunnera tinctoria) at edge of footpath, woman hiking along path. Devasa mountain range, Sao Miguel Island, Azores, Portugal. 2019.

Heather Angel / Alexander's rhubarb (Rheum alexandrae) and Dwarf purple rhododendron (Rhododendron impeditum) in wet valley. Large bracts on rhubarb protect tiny flowers from UV rays. Near Lake Kangding Xian Cuo,...

Heather Angel / Alexander's rhubarb (Rheum alexandrae) and Dwarf purple rhododendron (Rhododendron impeditum) in wet valley with low cloud. Large bracts on rhubarb protect tiny flowers from UV light. Near Lake Ka...

Felis Images / Noble rhubarb (Rheum nobile) plant, Sikkim, India.

Felis Images / Noble rhubarb (Rheum nobile) plant, Sikkim, India.

Felis Images / Noble rhubarb (Rheum nobile) plant, Sikkim, India.

Adrian Davies / Chilean rhubarb (Gunnera manicata) leaf in autumn showing remnant of green.

Jouan Rius / Rhubarb (Rheum rhabarbarum) growing in vegetable garden, France, August.

Ernie Janes / Indian Rhubarb (Darmera peltata) flowers in garden. England, UK.

Ernie Janes / Indian Rhubarb (Darmera peltata) flowers in garden. England, UK.

Nick Upton / Donje Bare glacier lake fringed with Bulrushes (Typha latifolia), Alpine dock / Monk's rhubarb (Rumex alpinus), Heartleaf / Giant oxeye daisy (Telekia speciosa) and dense mixed forest, Zelengora mount...

Ernie Janes / Rhubarb forcing pots in garden, England, UK, July.

MYN / Niall Benvie / Common butterbur (Petasites hybridus) Scotland, UK,

Dong Lei / Noble rhubarb (Rheum nobile), close up of flowers and leaves, Mount Namjagbarwa, Yarlung Zangbo Grand Canyon National Park, Tibet, China.

Dong Lei / Noble rhubarb (Rheum nobile), Mount Namjagbarwa, Yarlung Zangbo Grand Canyon National Park, Tibet, China.

Dong Lei / Nobile rhubarb (Rheum nobile), Mount Namjagbarwa, Yarlung Zangbo Grand Canyon National Park, Tibet, China.

Dong Lei / Noble rhubarb (Rheum nobile) leaf and flowers, Mount Namjagbarwa, Yarlung Zangbo Grand Canyon National Park, Tibet, China.

Dong Lei / Alexander rhubarb (Rheum alexandrae) Daocheng County, Sichuan Province, Qinghai-Tibet Plateau, China, August.

Dong Lei / Alexander rhubarb (Rheum alexandrae) Daocheng County, Sichuan Province, Qinghai-Tibet Plateau, China, August.

Adrian Davies / Chilean rhubarb leaf (Gunnera manicata) dead in winter, showing pattern of veins.

Willem Kolvoort / Butterbur (Petasites hybridus) along a small brook, central Holland. April.

Willem Kolvoort / Butterbur (Petasites hybridus) along small brook, central Holland. April.

Colin Varndell / Lesser burdock (Arctium minus) flowers, Dorset, UK, July.

Alex Hyde / Lesser Burdock (Arctium minus) seedheads (burrs) showing velcro-like hooks that catch on animal fur, Peak District National Park, Derbyshire, UK. April.

Ernie Janes / Old terracotta forcing pots on rhubarb patch. UK, June.

Angelo Gandolfi / Brazilian rhubarb (Gunnera manicata), State of Santa Catarina, Brazil, September.

Angelo Gandolfi / Brazilian rhubarb (Gunnera manicata), State of Santa Catarina, Brazil, September.

Chris Mattison / Butterbur (Petasites hybridus) on the River Wye at Millers Dale, Derbyshire, Peak District, March.

Dong Lei / Noble rhubarb (Rheum nobile) at alpine lake, Yarlung Zangbo Grand Canyon National Park, Nyingchi Prefecture, Qinghai Tibet Plateau, Tibet, China, June.

Alex Hyde / Butterbur (Petasites hybridus) in flower, in habitat, Lathkill Dale, Peak District National Park, Derbyshire, UK. April.

Alex Hyde / Butterbur flowers (Petasites hybridus) Peak District National Park, Derbyshire, UK. April.

Ernie Janes / Giant Hogweed (Heraculum mantegazziamum) growing near the sea, with woman walking dog in distance, Norfolk, England, July 2013.

Nick Upton / Lesser burdock (Arctium minus) with red stems and purple tinged spiny bracts on the flowerheads, about to flower in rough grassland near the coast, Gower Penisula, Wales, UK, July.

Rod Williams / Hoverflies (Helophilus pendulus) mating on rhubarb leaf, Lewisham, London,

Cyril Ruoso / Chacma Baboon (Papio ursinus) stealing rhubarb from shopper, Cape Town, South Africa. Sequence 2 of 6

Ernie Janes / Forced Rhubarb (Rheum rhaponticum) growing in garden, Norfolk, UK, March

Kevin Schafer / Darwin's Fox (Pseudalopex fulvipes) portrait amongst Chilean Rhubarb / Nalca (Gunnera tinctoria) in temperate rainforest, Chiloe Island, Chile, November, Critically Endangered

Kevin Schafer / Darwin's Fox (Pseudalopex fulvipes) portrait amongst Chilean Rhubarb / Nalca (Gunnera tinctoria) leaves, in temperate rainforest, Chiloe Island, Chile, November, Critically Endangered

Luiz Claudio Marigo / Giant Rhubarb (Gunnera manicata) on the slope of the road to Aparados da Serra National Park, Santa Catarina State, Southern Brazil.

Luiz Claudio Marigo / Giant Rhubarb (Gunnera manicata) on the slope of the road to Aparados da Serra National Park, Santa Catarina State, Southern Brazil.

Gary K. Smith / Rhubarb patch with terracotta forcer, in country garden, Norfolk, July

Gary K. Smith / Traditional Rhubarb bed with terracotta forcing pots, Norfolk, UK, April

Nick Turner / Carrots and Rhubarb for sale in Farmers Market, Bristol, UK.

Cyril Ruoso / Chacma Baboon (Papio ursinus) stealing mango from shopper, Cape Town, South Africa. Sequence 4 of 6

Cyril Ruoso / Chacma Baboon (Papio ursinus) with stolen mango and rhubarb, Cape Town, South Africa. Sequence 6 of 6

Cyril Ruoso / Chacma Baboon (Papio ursinus) stealing rhubarb from shopper, Cape Town, South Africa. Sequence 3 of 6

Pascal Tordeux / Rhubarb (Rumex alpinus / Rheum rhaponticum / rhabarbarum). French Alps, July.

Dr. Axel Gebauer / Chinese rhubarb (Rheum tanguticum), Koko Nor lake, Tso Ngonbo, Qinghai Hu, Qinghai Province, Tibet, Amdo, China

Doug Wechsler / Rhubarb weevil (Lixus concavus) resting on leaf, portrait, Pennsylvania, USA. May.

Nigel Cattlin / Rhubarb (Rheum sp.), covered crown with forced young stems and leaves shooting in early spring, Berkshire, UK. March.

Nigel Cattlin / Rhubarb (Rheum sp.), covered crown with forced young stems and leaves shooting in early spring, Berkshire, UK. March.

Nigel Cattlin / Rhubarb (Rheum sp.), stems shooting in late winter, Berkshire, UK. February.

Will Watson / Butterbur (Petasites hybridus) male flowers, Herefordshire, England, UK. March. Focus stacked.

Will Watson / Butterbur (Petasites hybridus) male flowers, Herefordshire, England, UK. March. Focus stacked.

Linda Pitkin / Female flowers of Butterbur (Petasites hybridus), Surrey, England. March.

Linda Pitkin / Female flower of Butterbur (Petasites hybridus), Surrey, England. March.

Linda Pitkin / Female flower of Butterbur (Petasites hybridus), Surrey, England. March.

Ashley Cooper / Gunnera (Gunnera tinctoria) leaf close up, Holehird Gardens, Windermere, Lake District National Park, Cumbria, UK. July.

Nigel Cattlin / Umbels of flowers of poisonous Giant hogweed (Heracleum mantegazzianum) plant against blue sky, Devon, England, UK, June.

Colin Varndell / Giant hogweed (Heracleum mantegazzianum) in bloom, Dorset, UK, June.

Nigel Cattlin / Umbels of flowers of poisonous and notifiable plant giant hogweed (Heracleum mantegazzianum) against blue sky, Devon, England, UK, June.

Alex Hyde / Butterbur (Petasites hybridus) in flower on river bank, Lathkill Dale, Peak District National Park, Derbyshire, UK. March.

Mike Read / Brimstone butterfly (Gonepteryx rhamni) male feeding on Lesser burdock (Arctium minus) Westhay Moor Nature Reserve, Somerset Wildlife Trust Reserve, Avalon Marshes, Somerset Levels and Moors, Somerset...

Linda Pitkin / Butterbur (Petasites hybridus), female flowers on bank of River Wandle, Croydon, London, England, UK. March.

Linda Pitkin / Butterbur (Petasites hybridus), female flowers on bank of River Wandle,Surrey, England, UK. March.

Nigel Cattlin / Flower of common butterbur (Petasites hybridus) an early flowering composite plant, Devon, England, UK, January

Nigel Cattlin / Flower spikes and young leaves of common butterbur (Petasites hybridus) an early flowering composite plant, Devon,England,UK, January.

Nigel Cattlin / Mature rhubarb (Rheum rhaponticum) plant with young red stems before harvest, Devon, England, UK, April

Adrian Davies / Chinese rhubarb (Rheum palmatum) Seeds, on white background, backlit. Each seed approx 5mm in size.

Nick Upton / Black garden ant (Lasius niger) feeding on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Nick Upton / Close-up of a Common red soldier beetle (Rhagonycha fulva) nectar feeding on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Nick Upton / Common red soldier beetles (Rhagonycha fulva) mating while nectar feeding on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Nick Upton / Common red soldier beetle (Rhagonycha fulva) nectar feeding on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Nick Upton / Common red soldier beetles (Rhagonycha fulva) nectar feeding and looking for mates on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Nick Upton / Common red soldier beetles (Rhagonycha fulva) nectar feeding and looking for mates on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Nick Upton / Common red soldier beetles (Rhagonycha fulva) mating while nectar feeding on Common hogweed flowers (Heracleum sphondylium), Wiltshire, England, UK, July.

Linda Pitkin / Butterbur (Petasites hybridus), male flower. A rare/ scarce plant in Surrey. The Weypole, Box Hill, Surrey, England, March..

Linda Pitkin / Butterbur (Petasites hybridus), female flowers, England: Surrey, on bank of River Wandle, Croydon, near boundary with Beddington, March

Linda Pitkin / Butterbur (Petasites hybridus), female flower, England: Surrey, on bank of River Wandle, Croydon, near boundary with Beddington, March