Carl Hansen Ostenfeld

Carl Hansen Ostenfeld

Carl Emil Hansen Ostenfeld (born Carl Emil Ostenfeld-Hansen) (3 August 1873 – 16 January 1931) was a Danish systematic botanist. He graduated from the University of Copenhagen 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, Ostenfeld became professor of botany at the University of Copenhagen and director of the Copenhagen Botanical Garden, both positions held until his death 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.

Ostenfeld is known as an explorer of the Danish flora, including marine plankton, as well as the flora of Western Australia.

Ostenfeld participated in the International Phytogeographic Excursion to the British Isles in 1911. The party studied the flora of parts of Ireland, including Killarney, Connemara and The Burren.

The standard author abbreviation Ostenf. is used to indicate this individual as the author when citing a botanical name.

About a dozen plant species are named after him. Also some localities in Greenland bear names that commemorate him:

• C.H. Ostenfeld Land in Northeast Greenland 75°15′N 21°32′W / 75.25°N 21.533°W / 75.25; -21.533
• C.H. Ostenfeld Nunatak in Wordie's Glacier, Northeast Greenland 74°17′N 22°56′W / 74.283°N 22.933°W / 74.283; -22.933