The plants of the peninsula includes original Gondwanan species , plants that have developed since the breakup of Gondwana and species from Indo-Malaya and from across the Torres Strait in New Guinea . Most variety is found in the rainforest areas . The flora of the peninsula includes original Gondwanan species , plants that have emerged since the breakup of Gondwana and species from Indo-Malaya and from across the Torres Strait in New Guinea with the most variety being found in the rainforest areas .