orchids contains calcium oxalate crystals, which are thought to be the main causative agent of contact dermatitis in vanilla plantation workers. Gallery References Further reading Ecott, Tim (2004). Vanilla: Travels in Search of the Luscious Substance. London: Penguin, New York: Grove Atlantic Rain, Patricia (2004). Vanilla: The Cultural History of the World's Favorite Flavor and Fragrance. New York: J. P. Tarcher/Penguin. External links Kew Species Profile: Vanilla planifolia (vanilla) History, Classification and Lifecycle of Vanilla planifolia Spices at UCLA History & Special Collections "The Present State of the West-Indies: Containing an Accurate Description of What Parts Are Possessed by the Several Powers in Europe" by Thomas Kitchin, 1778, in which Kitchin discusses vanilla "Vanillanomics – Watching global market forces at work in the far reaches of Madagascar" by Bloomberg Businessweek, December 2019 Crops originating from indigenous Americans Crops originating from Mexico Crops originating from Pre-Columbian North America Mesoamerican cuisine Mexican cuisine Non-timber forest products Pollination management Spices