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• Plant defense against herbivory — Poison ivy produces urushiol to protect the plant from herbivores. In humans this chemical produces an allergic skin rash, known as urushiol induced contact dermatitis …   Wikipedia

• Robert Brown (botanist) — Robert Brown FRS (21 December, 1773 ndash; 10 June, 1858) was a Scottish scientist who is acknowledged as the leading botanist to collect in Australia during the first half of the 19th century. He also is credited with the first observation of… …   Wikipedia