Karl Hermann Zahn (3 December 1865, Baiertal – 8 February 1940,

Haigerloch Haigerloch () is a town in the north-western part of the Swabian Alb in Germany. Geography Geographical location Haigerloch lies at between 430 and 550 metres elevation in the valley of the Eyach (Neckar), Eyach river, which forms two loops in a ...

) was a German

botanist Botany, also called plant science, is the branch of natural science and biology studying plants, especially Plant anatomy, their anatomy, Plant taxonomy, taxonomy, and Plant ecology, ecology. A botanist or plant scientist is a scientist who s ...

who was a leading authority regarding the genus ''

Hieracium ''Hieracium'' (), known by the common name hawkweed and classically as (from ancient Greek ἱέραξ, 'hawk'), is a genus of flowering plant in the family Asteraceae, and closely related to dandelion (''Taraxacum''), chicory (''Cichorium''), ...

'' (

hawkweed ''Hieracium'' (), known by the common name hawkweed and classically as (from ancient Greek ἱέραξ, 'hawk'), is a genus of flowering plant in the family Asteraceae, and closely related to dandelion (''Taraxacum''), chicory (''Cichorium''), ...

). He received his education in

Karlsruhe Karlsruhe ( ; ; ; South Franconian German, South Franconian: ''Kallsruh'') is the List of cities in Baden-Württemberg by population, third-largest city of the States of Germany, German state of Baden-Württemberg, after its capital Stuttgart a ...

(1884–85), and beginning in 1891, worked as a high school teacher in

Heidelberg Heidelberg (; ; ) is the List of cities in Baden-Württemberg by population, fifth-largest city in the States of Germany, German state of Baden-Württemberg, and with a population of about 163,000, of which roughly a quarter consists of studen ...

. He later taught high school classes in

Freiburg im Breisgau Freiburg im Breisgau or simply Freiburg is the List of cities in Baden-Württemberg by population, fourth-largest city of the German state of Baden-Württemberg after Stuttgart, Mannheim and Karlsruhe. Its built-up area has a population of abou ...

and in

Donaueschingen Donaueschingen (; Low Alemannic German, Low Alemannic: ''Eschinge'') is a German town in the Black Forest in the southwest of the States of Germany, federal state of Baden-Württemberg in the Schwarzwald-Baar ''Districts of Germany, Kreis''. It ...

. In 1923 he was appointed professor of

geometry Geometry (; ) is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician w ...

chemistry Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and chemical compound, compounds made of atoms, molecules a ...

and material technology at

Karlsruhe University of Applied Sciences With around 7,000 students, Karlsruhe University of Applied Sciences (Hochschule Karlsruhe - HKA) is the second largest university of applied sciences in the German federal state of Baden-Württemberg (as of winter semester 2022/2023). It is a fo ...

Published works

* ''Die Hieracien der Schweiz'', 1906 – Hieracium of

Switzerland Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...

. * ''Les Hieracium des Alpes maritimes'', 1916 – Hieracium of the

Maritime Alps The Maritime Alps ( ; ) are a mountain range in the southwestern part of the Alps. They form the border between the regions of France, French region of Provence-Alpes-Côte d'Azur and the regions of Italy, Italian regions of Piedmont and Liguria ...

. * ''Compositae-Hieracium'', (published in 12 editions from 1921 to 1957). Zahn made valuable contributions involving ''Hieracium'' towards

Adolf Engler Heinrich Gustav Adolf Engler (25 March 1844 – 10 October 1930) was a German botanist. He is notable for his work on plant taxonomy and phytogeography, such as ''Die natürlichen Pflanzenfamilien'' (''The Natural Plant Families''), edited with K ...

's "''

Das Pflanzenreich Heinrich Gustav Adolf Engler (25 March 1844 – 10 October 1930) was a German botanist. He is notable for his work on plant taxonomy and phytogeography, such as ''Die natürlichen Pflanzenfamilien'' (''The Natural Plant Families''), edited with ...

''", as well as to Ascherson and Graebner's "''Synopsis der mitteleuropäischen Flora''". ---- Zahn edited and distributed the

exsiccata Exsiccata (Latin, ''gen.'' -ae, ''plur.'' -ae) is a work with "published, uniform, numbered set of preserved specimens distributed with printed labels". Typically, exsiccatae are numbered collections of dried herbarium Biological specimen, spe ...

series ''Hieraciotheca Europaea edita e Carolo Hermanno Zahn'' (1906–1914).

References

{{DEFAULTSORT:Zahn, Karl Hermann 1865 births 1940 deaths People from Wiesloch 19th-century German botanists 20th-century German botanists