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Aside from genetics Pontecorvo's life long passion was alpine plant photography and ecology. He set aside each summer for pursuits to some of the world's most spectacular alpine regions, and his collection contains thousands of slides of alpine flowers and their habitats which he was using to research a book on plants at high altitudes (sadly this was never finished). He visited various mountains and national parks in the USA in the 1950s and 1960s, in the 1970s he travelled to Iran to study the flora of the Fars region and Mt Elburz. He explored the Himalayas in India and the Tien Shan and Kunlun mountains in China in the 1980s. These trips were organized with the help of The Royal Society or at the invitation of local academies and were often combined with lecture tours and courses. Ponte often made excursions to mountains a precondition for accepting invitations.
