Ludwig Eduard Theodor Lösener (23 November 1865 – 2 June 1941) was a German botanist who collected widely in the field in Germany: Amrum island (1912), the Alps, the Black Forest, Bavaria, Rügen island and Tyrol in modern Austria.
In 1941, botanist Albert Charles Smith published the genus Loeseneriella, in the family Celastraceae, in his honour.
[1] The standard author abbreviation Loes.
is used to indicate this person as the authority when citing a botanical name.
The International Plant Names Index lists more than 1800 taxa attributed to him.