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Cornelis Gijsbert Gerrit Jan "Kees" van Steenis (31 October 1901, Utrecht – 14 May 1986) was a Dutch botanist. Van Steenis wrote many publications on the flora of the Maritime Southeast Asia region, among others about taxonomy and plant geography. Besides his expeditions in the Malay region, he also traveled in Australia and New Zealand.
Biography
Van Steenis attended high school in Utrecht from 1915 to 1920. He obtained his masters and PhD at the University of Utrecht in 1925 and 1927, respectively. From 1927 to 1946, Van Steenis was botanist at the herbarium of 's Lands Plantentuin in Bogor, Indonesia.
From 1935 to 1942 he was co-editor of The Tropical Nature, the magazine of the Dutch East Indian Natural History Society. From 1946 to 1949 he was active in the Netherlands, where he was engaged in the organization of Flora Malesiana, a description of the flora of Maritime Southeast Asia and New Guinea. From December 1949 to November 1950 he lived again in Bogor (formerly Buitenzorg).
From 1950 until his death in 1986 he was director of the Flora Malesiana Foundation. In 1951 he was appointed professor of tropical botany and plant geography on behalf of the Royal Tropical Institute in Amsterdam. From 1953 he was a professor in these subjects at the University of Leiden. From 1962 to 1972 he was Professor and Director of the National Herbarium of the Netherlands as a successor of Herman Johannes Lam. Van Steenis was succeeded in this position by Kees Kalkman.
On 5 June 1950 he was a corresponding member of the Royal Dutch Academy of Sciences, but already canceled this membership on 1 December of that year. He was also a corresponding member of the Botanical Society of America.
The Van Steenis Building of the University of Leiden, the Rubiaceae genus Steenisia, and the street Cornelis van Steenishof in Oegstgeest are named after him.
His great nephew is Huw van Steenis the British banker.