Calvin to propose the exploitation of E. tirucalli for producing oil. This usage is particularly appealing because of the ability of E. tirucalli to grow on land that is not suitable for most other crops. Calvin estimated that 10 to 50 barrels of oil per acre was achievable. In the 1980s the Brazilian national petroleum company Petrobras began experiments based on these ideas. It has also been used in the production of rubber, but neither have been very successful. Gallery See also List of ineffective cancer treatments List of vegetable oils Biodiesel References External links tirucalli tirucalli Least concern plants Plants described in 1753 Taxa named by Carl Linnaeus Flora of Africa