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Carl Emil Hansen Ostenfeld (born Carl Emil Ostenfeld-Hansen) (August 3, 1873 - January 16, 1931) was a Danish systematic botanist. He graduated from the University of Copenhagenmarker under professor Eugenius Warming. He was a keeper at the Botanical Museum 1900-1918, when he became professor of botany at the Royal Veterinary and Agricultural College. In 1923, by the early retirement of Raunkiær's, Ostenfeldt became professor of botany at the University of Copenhagen and director of the Copenhagen Botanical Gardenmarker, both positions held until his dead in 1931. He was a member of the Royal Danish Academy of Sciences and Letters and served on the board of directors of the Carlsberg Foundation.

Ostenfeldt is known as an explorer of the Danishmarker flora, including marine plankton, as well as the flora of Western Australiamarker.

Ostenfeld participated in the International Phytogeographic Excursion to the British Islesmarker in 1911. The party studied the flora of parts of Irelandmarker, including Killarneymarker, Connemara and The Burrenmarker.

About a dozen plant species and C.H. Ostenfeld Land in East Central Greenland is named after him.

Selected scientific works

  • Ostenfeld, C.H. & Johannes Schmidt (1901) Plankton fra det Røde Havmarker og Adenbugten. Videnskabelige meddelelser fra Dansk Naturhistorisk Forening 1901: 141-182.


  • Gelert, O. & Ostenfeld, C.H. (1902) Flora Arctica - containing description of the flowering plants and ferns, found in the Arctic regions, with their distribution in these countries, illustrated by numerous figures in the text.
    • Part 1. Pteridophyta, Gymnospermae and Monocotyledones. Copenhagenmarker, 1902.


  • Ostenfeld, C.H. (1908) On the immigration of Biddulphia sinensis Grev. and its occurrence in the North Sea during 1903-1907 and on its use for the study of the direction and rate of flow of the currents. Meddelelser fra Kommissionen for Danmarks Fiskeri- og Havundersøgelser: Serie Plankton 1 (6): 1-44.






  • Ostenfeld, C. E. H. (1916) Contributions to West Australian Botany, part I: Introduction, The sea-grasses of West Australia. Dansk Botanisk Arkiv, 2(6): 1-44


  • Ostenfeld, C. E. H. (1918a) Contributions to West Australian Botany, part II: Stray notes from the tropical West Australia. Dansk Botanisk Arkiv, 2(8) : 1-29


  • Ostenfeld, C. E. H. (1918b) Contributions to West Australian Botany, part II: A revision of the West Australian species of Triglochin, Crassula (Tillaea) and Frankenia. Dansk Botanisk Arkiv, 2(8) : 30-55


  • Ostenfeld, C. E. H. (1921) Contributions to West Australian Botany, part III : Additions and notes to the flora of extra-tropical W. Australia. Biologiske Meddelelser, Kongelige Danske Videnskabernes Selskab, 3(2): 1-144


  • Ostenfeld, C. H. (1923) Critical Notes on the Taxonomy and Nomenclature of Some Flowering Plants from Northern Greenland (II Thule Expedition 1916-1918). Meddelelser om Grønland, 64


  • Ostenfeld, C. H. (1923) Flowering Plants and Ferns from Wolstenholme Sound (ca. 76°30' N. Lat.) and Two Plant Lists from Inglefield Gulf and Inglefield Land (77°28' and 79°10' N. Lat.) (II Thule Expedition 1916-1918). Meddelelser om Grønland, 64: 189-206




  • Ostenfeld, C.H. (1926) The flora of Greenland and its origin. Biologiske Meddelelser, Kongelige Danske Videnskabernes Selskab, 6, 1-71


  • Ostenfeld, C.H. (1931) The distribution within Denmark of the higher plants Results of the topographic-botanical investigation. 1: A brief historical survey of the investigation. Det Kongelige Danske Videnskabernes Selskabs Skrifter, Naturvidenskabelig og Mathematisk Afd., 9. Række, 3(1)




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