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Brassica napus produced a bitter oil unfit for human consumption, until Canadian researchers bred a variety known as "Canadian Oilseed, Low-Acid" – or canola for short. Pictured here are rapeseed oil plants in Yuma, Arizona. (Photo by Eric Lyons) Brassica napus produced a bitter oil unfit for human consumption, until Canadian researchers bred a variety known as "Canadian Oilseed, Low-Acid" – or canola for short. Pictured here are rapeseed oil plants in Yuma, Arizona.