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Rolf Martin Theodor Dahlgren (7 July 1932 – 14 February 1987) was a
Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...
-
Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish ance ...
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 ...
and
professor Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin as a "person who pr ...
at the
University of Copenhagen The University of Copenhagen ( da, Københavns Universitet, KU) is a prestigious public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in ...
from 1973 to his death.


Life

Dahlgren was born in
Örebro Örebro ( , ) is the List of urban areas in Sweden by population, sixth-largest city in Sweden, the seat of Örebro Municipality, and capital of the Örebro County. It is situated by the Närke Plain, near the lake Hjälmaren, a few kilometers in ...
on 7 July 1932 to
apothecary ''Apothecary'' () is a mostly archaic term for a medical professional who formulates and dispenses '' materia medica'' (medicine) to physicians, surgeons, and patients. The modern chemist (British English) or pharmacist (British and North Ameri ...
Rudolf Dahlgren and wife Greta née Dahlstrand. He took his
MSc MSC may refer to: Computers * Message Sequence Chart * Microelectronics Support Centre of UK Rutherford Appleton Laboratory * MIDI Show Control * MSC Malaysia (formerly known as Multimedia Super Corridor) * USB mass storage device class (USB MSC ...
degree in Biology in (1955) and
PhD PHD or PhD may refer to: * Doctor of Philosophy (PhD), an academic qualification Entertainment * '' PhD: Phantasy Degree'', a Korean comic series * ''Piled Higher and Deeper'', a web comic * Ph.D. (band), a 1980s British group ** Ph.D. (Ph.D. albu ...
degree in Botany in (1963) at
Lund University , motto = Ad utrumque , mottoeng = Prepared for both , established = , type = Public research university , budget = SEK 9 billion Scania Scania, also known by its native name of Skåne (, ), is the southernmost of the historical provinces of Sweden, provinces (''landskap'') of Sweden. Located in the south tip of the geographical region of Götaland, the province is roughly conte ...
,
Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...
on 14 February 1987.


Career

He continued working on
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
n plants during expeditions in 1956-57 and 1965–66, while affiliated with the ''Botanical Museum'' in Lund as ''
docent The title of docent is conferred by some European universities to denote a specific academic appointment within a set structure of academic ranks at or below the full professor rank, similar to a British readership, a French " ''maître de conf ...
''. In 1973, he became
professor Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin as a "person who pr ...
of
botany 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 w ...
at the
University of Copenhagen The University of Copenhagen ( da, Københavns Universitet, KU) is a prestigious public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in ...
. Here, he developed his
system A system is a group of Interaction, interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment (systems), environment, is described by its boundaries, ...
of
Angiosperm Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...
classification, based on many more characters simultaneously than previous systems, most notably many
chemical A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., wi ...
plant traits (see also
chemotaxonomy Webster's Dictionary, Merriam-Webster defines ''chemotaxonomy'' as the method of biology, biological classification based on similarities and dissimilarity in the structure of certain chemical compound, compounds among the organisms being classifi ...
). Although the system was first presented in
Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish ance ...
, it rapidly gained widespread acceptance, particularly due to the instructive diagrams, so-called Dahlgrenograms. His work on family circumscription in the
Monocotyledons Monocotyledons (), commonly referred to as monocots, (Lilianae ''sensu'' Chase & Reveal) are grass and grass-like flowering plants (angiosperms), the seeds of which typically contain only one embryonic leaf, or cotyledon. They constitute one of t ...
, published with
Harold Trevor Clifford Trevor Clifford (1927-2019) was an Australian botanist and taxonomist, distinguished for his work on the hybridisation of species and palaeobotany. Early life Harold Trevor Clifford was born in Melbourne, Australia on April 18, 1927. His fat ...
and Peter Frederick Yeo, has had profound influence well into the molecular age. A Rolf Dahlgren Memorial Symposium was held 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 ...
,
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later in 1987. The couple had three children, Susanna, Helena and Fredrik. In 1986, he was elected member of
Royal Swedish Academy of Sciences The Royal Swedish Academy of Sciences ( sv, Kungliga Vetenskapsakademien) is one of the Swedish Royal Academies, royal academies of Sweden. Founded on 2 June 1739, it is an independent, non-governmental scientific organization that takes special ...
. The
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
n monotypic plant genus ''
Dahlgrenodendron ''Cryptocarya'' is a genus of evergreen trees belonging to the laurel family, Lauraceae. The genus includes more than 350 species, distributed through the Neotropical, Afrotropical, Indomalayan, and Australasian realms. Overview The genus incl ...
'' (J.H. Ross) J.J.M. van der Merwe & A.E. van Wyk was named to him honour in 1988


List of selected publications

* * * * Dahlgren R. (1975b). The distribution of characters within an angiosperm system. I. Some embryological characters. Botaniska Notiser 128: 181–197 * in * Dahlgren, R., 1977b. A note on the Taxonomy of the 'Synpetalae' and related groups. Publications of the Cairo University Herbarium, 7–8: 83- 102. * Dahlgren. R., Nielsen, B. J., Goldblait, P. & Rourke, J. P., 1979. Further notes on Retziaceae, its chemical contents and affinities.
Annals of the Missouri Botanical Garden The ''Annals of the Missouri Botanical Garden'' is a long-established major peer-reviewed journal of botany, established in 1914 by the Missouri Botanical Garden, under the directorship of botanist and phycologist, George Thomas Moore, and still p ...
, 66: 545-556 * Dahlgren, R., Jensen, S. R., & Nielsen, B. J., 1976. Iridoid compounds in Fouquieraceae and notes on its possible affinities. Bolaniska Notiser 129: 207-212. * * * Dahlgren R.(1983). "General Aspects of Angiosperm Evolution and Macrosystematics". Nordic Journal of Botany 3: 119-149 * *
Additional excerpts
*


See also

*
Dahlgren system One of the modern systems of plant taxonomy, the Dahlgren system was published by monocot specialist Rolf Dahlgren in 1975 and revised in 1977, and 1980. However, he is best known for his two treatises on monocotyledons in 1982 and revised in 19 ...
*
Chemotaxonomy Webster's Dictionary, Merriam-Webster defines ''chemotaxonomy'' as the method of biology, biological classification based on similarities and dissimilarity in the structure of certain chemical compound, compounds among the organisms being classifi ...


References


Citations


Sources

* * *


External links


Example DahlgrenogramPortrait photo (Rolf Dahlgren is the person to the right)
{{DEFAULTSORT:Dahlgren, Rolf 20th-century Danish botanists 20th-century Swedish botanists Members of the Royal Swedish Academy of Sciences 1932 births 1987 deaths Lund University alumni University of Copenhagen faculty