Juergen Freund / Timelapse of a Cairns birdwing (Ornithoptera euphorion) butterfly caterpillar metamorphosing into a chrysalis, Queensland, Australia, April.

Juergen Freund / Timelapse of a Cairns birdwing (Ornithoptera euphorion) butterfly caterpillar emerging from egg on an Dutchman's pipe (Aristolochia) leaf and feeding, Queensland, Australia, April.

Jose B. Ruiz / Birthwort / Dutchman's Pipe (Aristolochia sempervirens), Alcal de Guadara, Seville, Spain

Geoff Simpson / Dutchman's pipe{Hypopitys monotropa} Peak District NP, Derbyshire, UK - saprophytic plant lacking in chlorophyll

Heather Angel / Brazilian Dutchman's pipe flower (Aristolochia gigantea) with green inflated pouch. Flower smells of carrion to attract fly pollinators. Cultivated in glasshouse, Surrey, England, UK. Native to Br...

Heather Angel / Brazilian Dutchman's pipe flower (Aristolochia gigantea) with green inflated pouch. Flower smells of carrion to attract fly pollinators. Cultivated in glasshouse, Surrey, England, UK. Native to Br...

Eladio Fernandez / Dutchman's pipe (Aristolochia passiflorifolia) Camaguey, Cuba, July.

Mike Read / Andalusian Dutchman's pipe (Aristolochia baetica) Quinta do Lago part of Ria Formosa Nature Reserve, Algarve, Portugal, February.

Paul Harcourt Davies / Birthwort (Aristolochia clematitis) Umbria, Italy, June.

Paul Harcourt Davies / Yellow bird's nest (Monotropa hypopitys) growing in pine needles. This plant is parasitic upon fungi. Forca D'Ancarano, Norcia, Umbria, Italy, June.

Paul Harcourt Davies / Yellow bird's nest / Dutchman's pipe (Monotropa hypopitys) flowers growing in pine needles. Parasitic plant on fungi. Forca D'Ancarano, Norcia, Umbria, Italy, June.

Paul Harcourt Davies / Yellow bird's nest / Dutchman's pipe (Monotropa hypopitys) flower growing in pine needles. This species is parasitic on fungi. Forca D'Ancarano, Norcia, Umbria, Italy. June.

Dong Lei / Dutchman's pipe (Monotropa hypopitys) flowers, Jiuzhaigou National Nature Reserve, Sichuan Province, China, August.

Philippe Clement / Close up of European birthwort (Aristolochia clematitis) in flower, native to Europe, June

Dong Lei / Dutchman's pipe (Monotropa hypopitys) Lijiang Laojunshan National Park, Yunnan, China, July.

Dong Lei / Dutchman's pipe (Monotropa hypopitys) Lijiang Laojunshan National Park, Yunnan, China, July.

Adrian Davies / Birthwort (Aristolochia rotunda), Provence, France, May.

Adrian Davies / Birthwort (Aristolochia rotunda), Provence, France, May.

Simon Colmer / Dutchman's pipe (Aristolochia elegans), Budongo Forest Reserve, Uganda. A medicinal plant used traditionally to treat malaria and snake bite.

Paul Harcourt Davies / Cretan Birthwort (Aristolochia cretica) a plant endemic to Crete, April and Karpathos, near Plakias, Crete, April

Gary K. Smith / Dutchman's pipe(Hypopitys monotropa) saprophyte plant lacking chlorophyll, growing under mature pines on coastal dunes, North Norfolk, UK, June

Gary K. Smith / Dutchman's pipe(Hypopitys monotropa) saprophyte plant lacking chlorophyll, growing under mature pines on coastal dunes, North Norfolk, UK, June

Gary K. Smith / Dutchman's pipe(Hypopitys monotropa) saprophyte plant lacking chlorophyll, growing under mature pines on coastal dunes, North Norfolk, UK, June

Gary K. Smith / Dutchman's pipe(Hypopitys monotropa) saprophyte plant lacking chlorophyll, growing under mature pines on coastal dunes, North Norfolk, UK, June

MYN / Niall Benvie / Birthwort / Dutchman's pipe flower {Aristolochia sp} Spain meetyourneighbours.net project

Jose B. Ruiz / Birthwort / Dutchman's Pipe (Aristolochia sempervirens) Alcalá de Guadaíra, Seville, Spain

MYN / Niall Benvie / Dutchman's pipe{Hypopitys monotropa} Scotland, UK, July

Niall Benvie / Flower of Dutchman's pipe Aristolochia cretica) Crete

Doug Wechsler / Dutchman's pipe/ Pinesap {Hypopitys monotropa} saprophytic. Olympic NP WA, USA

Michael & Patricia Fogden / Ecuadorian Dutchman's Pipe (Aristolochia pichinchensis) flower in rainforest, Ecuador

Robert Thompson / Yellow birds' nest / Dutchman's pipe (Hypopitys monotropa) growing under beech trees, Castle Calwell, County Fermanagh, Northern Ireland, UK, August

Guy Edwardes / Southern festoon butterfly (Zerynthia polyxena) newly emerged adult, resting on Birthwort (Aristolochia clematitis) stem, near Bratsigovo, Bulgaria. May.

Guy Edwardes / Southern festoon butterfly (Zerynthia polyxena) newly emerged adult, resting on its food plant, Birthwort (Aristolochia clematitis), near Bratsigovo, Bulgaria. May.

Guy Edwardes / Five Southern festoon butterfly (Zerynthia polyxena) eggs laid on Birthwort (Aristolochia clematitis) leaf, near Bratsigovo, Bulgaria. May.

Guy Edwardes / Southern festoon butterflies (Zerynthia polyxena), newly emerged adults resting on their foodplant, Birthwort (Aristolochia clematitis), near Bratsigovo, Bulgaria, May.

Paul Harcourt Davies / Pale birthwort (Aristolochia pallida) in flower, Selva di Lamone, Lazio, Umbria, Italy. March.

Paul Harcourt Davies / Pale birthwort (Aristolochia pallida), Foresta Umbra, Gargano, Puglia, Italy. April.

Alan Williams / Yellow bird's-nest (Hypopitys monotropa) saprophytic plant growing in damp woodland, near Wrexham, North Wales, UK. June 2019.

Alan Williams / Yellow bird's-nest (Hypopitys monotropa) saprophytic plant growing in damp woodland, near Wrexham, North Wales, UK. June 2019.