Carl Otto Robert Peter Paul Graebner (29 June 1871 in
Aplerbeck
Aplerbeck is a borough (''Stadtbezirk'') of the city of Dortmund in the Ruhr district of North Rhine-Westphalia, Germany. Since 1929, it has been a suburb of Dortmund, located in the city's south-east. The river Emscher, a tributary of the Ruhr ( ...
– 6 February 1933 in
Berlin
Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...
) was a German
botanist
Botany, also called , plant biology or phytology, is the science of plant life and a branch of biology. A botanist, plant scientist or phytologist is a scientist who specialises in this field. The term "botany" comes from the Ancient Greek wo ...
.
In 1895 he obtained his doctorate in Berlin, successively working as an assistant and then as
curator
A curator (from la, cura, meaning "to take care") is a manager or overseer. When working with cultural organizations, a curator is typically a "collections curator" or an "exhibitions curator", and has multifaceted tasks dependent on the parti ...
(1904) at the botanical gardens. During the 1890s he performed botanical investigations in
Jerichower Land
Jerichower Land is a district (''Kreis'') in the north-east of Saxony-Anhalt, Germany. Its neighbouring administrative units are (clockwise from the south): the districts of Anhalt-Bitterfeld, Salzlandkreis, the city of Magdeburg, the districts of ...
and
Vorharz
Vorharz is a ''Verbandsgemeinde'' ("collective municipality") in the Harz district, in Saxony-Anhalt, Germany. It is situated east of Halberstadt. It was created on 1 January 2010. The seat of the ''Verbandsgemeinde'' is in Wegeleben.
The ''Verba ...
with
Paul Ascherson (1834–1913).
He later became a professor at the
Botanical Garden and Museum in Berlin-Dahlem, from where he conducted