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 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 ...
and
professor
Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other tertiary education, post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin ...
at the
University of Copenhagen
The University of Copenhagen (, KU) is a public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in Scandinavia, after Uppsala University.
...
from 1973 to his death.
Life
Dahlgren was born in
Örebro
Örebro ( ; ) is the seventh-largest city in Sweden, the seat of Örebro Municipality, and capital of Örebro County. It is situated by the Närke Plain, near the lake Hjälmaren, a few kilometers inland along the small river Svartån, and ...
on 7 July 1932 to
apothecary
''Apothecary'' () is an Early Modern English, archaic English term for a medicine, medical professional who formulates and dispenses ''materia medica'' (medicine) to physicians, surgeons and patients. The modern terms ''pharmacist'' and, in Brit ...
Rudolf Dahlgren and wife Greta née Dahlstrand. He took his
MSc degree in Biology in (1955) and
PhD
A Doctor of Philosophy (PhD, DPhil; or ) is a terminal degree that usually denotes the highest level of academic achievement in a given discipline and is awarded following a course of graduate study and original research. The name of the deg ...
degree in Botany in (1963) at
Lund University
Lund University () is a Public university, public research university in Sweden and one of Northern Europe's oldest universities. The university is located in the city of Lund in the Swedish province of Scania. The university was officially foun ...
. He was killed in a car crash in
Scania
Scania ( ), also known by its native name of Skåne (), is the southernmost of the historical provinces of Sweden, provinces () of Sweden. Located in the south tip of the geographical region of Götaland, the province is roughly conterminous w ...
,
Sweden
Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...
on 14 February 1987.
Career
He continued working on
South Africa
South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
n plants during expeditions in 1956-57 and 1965–66, while affiliated with the ''Botanical Museum'' in Lund as ''
docent
The term "docent" is derived from the Latin word , which is the third-person plural present active indicative of ('to teach, to lecture'). Becoming a docent is often referred to as habilitation or doctor of science and is an academic qualifi ...
''. In 1973, he became
professor
Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other tertiary education, post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin ...
of
botany
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 ...
at the
University of Copenhagen
The University of Copenhagen (, KU) is a public university, public research university in Copenhagen, Copenhagen, Denmark. Founded in 1479, the University of Copenhagen is the second-oldest university in Scandinavia, after Uppsala University.
...
. Here, he developed his
system
A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its open system (systems theory), environment, is described by its boundaries, str ...
of
Angiosperm
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed within a fruit ...
classification, based on many more characters simultaneously than previous systems, most notably many
chemical
A chemical substance is a unique form of matter with constant chemical composition and characteristic properties. Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combin ...
plant traits (see also
chemotaxonomy
Merriam-Webster defines ''chemotaxonomy'' as the method of biological classification based on similarities and dissimilarity in the structure of certain compounds among the organisms being classified. Advocates argue that, as proteins are more c ...
). Although the system was first presented in
Danish, 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 flowering plants whose seeds contain only one embryonic leaf, or cotyledon. A monocot taxon has been in use for several decades, but with various ranks and ...
, published with
Harold Trevor Clifford 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 of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...
,
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
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 () 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 responsibility for promoting nat ...
. The
South Africa
South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. Its Provinces of South Africa, nine provinces are bounded to the south by of coastline that stretches along the Atlantic O ...
n monotypic plant genus ''
Dahlgrenodendron'' (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 ...
, 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 198 ...
*
Chemotaxonomy
Merriam-Webster defines ''chemotaxonomy'' as the method of biological classification based on similarities and dissimilarity in the structure of certain compounds among the organisms being classified. Advocates argue that, as proteins are more c ...
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
Academic staff of the University of Copenhagen