Jussi Murtosaari / Migrant hawker (Aeshna mixta) Raasepori, Uusimaa, Etela-Suomi / South Finland, Finland. August

Simon Colmer / Madagascar periwinkle (Catharanthus or Vinca roseus) Medicinal plant: used to cure hypertension, kidney failure, malaria and diabetes. Used in the treatment of leukemia.

Daniel Heuclin / Madagascar Periwinkle / Cacapoule (Catharanthus roseus) growing in an Amerindian village. Introduced to French Guiana as a medicinal plant for treatment of leukemia, lymphoma, and diabetes. August 200...

Kevin Schafer / Rosy Periwinkle (Catharanthus roseus) leaves and flowers used for anti-cancer medicine, Madagascar

Ingo Arndt / Rosy Periwinkle (Catharanthus roseus) pair in bloom, plants are harvested for medicinal use, Madagascar

Ingo Arndt / Rosy Periwinkle (Catharanthus roseus) in bloom, plants are harvested for medicinal use, Madagascar

Adrian Davies / Madagascar periwinkle (Catharanthus roseus) which is cultivated for herbal medicine

John Cancalosi / Madagascan Periwinkle (Catharanthus roseus)

John Cancalosi / Madagascan Periwinkle (Catharanthus roseus)

Pete Oxford / Isalo National Park with Rosy periwinkle (Catharanthus roseus) in bloom in foreground and Sandstone Massif in background, MADAGASCAR

Pete Oxford / Isalo National Park with Rosy periwinkle (Catharanthus roseus) in bloom in foreground and Sandstone Massif in background, MADAGASCAR

Doug Wechsler / Madagascar / Rosy periwinkle (Catharanthus roseus)source of cancer cure, Madagascar

Pete Oxford / Rosy Periwinkle (Catharanthus roseus) a medicinal plant in bloom, Isalo Massif, Isalo National Park, Madagascar

Nick Garbutt / Two Malagasy children holding posie of Rosy Periwinkles {Catharanthus roseus}, southern Madagascar

Nick Garbutt / Madagascar Periwinkle {Catharanthus roseus} Madagascar

Gerry Ellis / Rosy Periwinkle (Catharanthus roseus) in bloom, plants are harvested for medicinal use, Madagascar

Pete Oxford / Madagascar periwinkle (rosy) {Catharanthus roseus} Madagascar source of cancer drug