Johannes Elias Teijsmann

Jun 1, 1808 - Jun 22, 1882

Johannes Elias Teijsmann was a biologist, botanist and plant collector. He was born in Arnhem, The Netherlands.
His surname is sometimes spelled Teysmann, although he himself spelled it Teijsmann.
Teijsmann travelled to Java in 1830 as gardener of Governor General Johannes van den Bosch. He was appointed the director - hortulanus - of the 's Lands Plantentuin in Buitenzorg the following year, a post he held until 1869. He took part in important botanical expeditions throughout maritime Southeast Asia. Teijsmann was also part of a Dutch fact-finding mission to Siam.
He is notable for the introduction of cassava plants as a food source to alleviate famines in the then Dutch East Indies. Together with his collaborator Justus Carl Hasskarl, he introduced the cultivation of Cinchona trees for the production of quinine to treat malaria. There was bitter conflict between Teijsmann and two fellow botanists, Johann Eliza de Vrij and Franz Wilhelm Junghuhn on the effectiveness of various Cinchona species in the treatment of malaria. Nevertheless, successful experimentation on the plant was carried out in the new Cibodas Gardens which eventually made Java the largest producer of kina.
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