Cyril Ruoso / Rafflesia (Rafflesia arnoldii) flowers, Bukit Barisan Selatan National Park, Sumatra, Indonesia

Paul Harcourt Davies / Cytinus (Cytinus hypocistus) in flower, a species parasitic on the roots of various Cistus species. Akrotiri, Chania, Crete, April

Paul Harcourt Davies / Cytinus (Cytinus hypocistus) a species parasitic on the roots of various Cistus species. Akrotiri, Chania, Crete, April

Chris Mattison / Flower of Hydnora (Hydnora africana) a rare plant parasitic on species of the genus Euphorbia. Cornellskop, Richtersveld, South Africa.

Christian Ziegler / Rafflesia (Rafflesia Keithii) flower, Sabah, Borneo, Malaysia

Christian Ziegler / Rafflesia (Rafflesia Keithii) flower attracts flies, Sabah, Borneo, Malaysia

Christian Ziegler / Rafflesia (Rafflesia pricei) flower, Sabah, Borneo, Malaysia

Jouan & Rius / Closed bud of Rafflesia flower (Rafflesia keithii) in Gunung Gading NP, Borneo, Sarawak, Malaysia

Jouan & Rius / Close up of Rafflesia flower (Rafflesia keithii) in Gunung Gading NP, Borneo, Sarawak, Malaysia

Jouan & Rius / Fly on Rafflesia flower (Rafflesia keithii), flies are pollinators of the flowers, Gunung Gading NP, Borneo, Sarawak, Malaysia

Jouan & Rius / Rafflesia flower (Rafflesia keithii) in Gunung Gading NP, Borneo, Sarawak, Malaysia

Chien Lee / Rafflesia (Rafflesia arnoldii) flower growing on hillside, Bukittinggi, Sumatra, Indonesia