Alexandre Louis Simon Lejeune (23 December 1779 in

Verviers Verviers (; wa, Vervî) is a city and municipality of Wallonia located in the province of Liège, Belgium. The municipality consists of the following districts: Ensival, Heusy, Lambermont, Petit-Rechain, Stembert, and Verviers. It is also the ...

– 28 December 1858 in Verviers) was a physician and

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 1801 he entered the school of medicine in

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...

, but was subsequently forced to abandon his studies due to military conscription. After finishing his military duties in late 1804, he relocated to

Ensival Ensival ( wa, Enzivå) is a town of Wallonia and a district of the municipality of Verviers, located in the province of Liège, Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Nort ...

as a physician. Three years later, he settled permanently in his hometown of Verviers. With Richard Courtois (1806–1835), he was co-author of "Compendium florae belgicae". He was a mentor to

Marie-Anne Libert Marie-Anne Libert, (born 7 April 1782 in Malmedy, province of Liège, died 14 January 1865 in Malmedy) was a Belgian botanist and mycologist. She was one of the first women plant pathologists. She is sometimes referred to as "Anne-Marie Libert." ...

, who he introduced to Augustin Pyramis de Candolle. Libert named the genus ''Lejeunea'' (family

Lejeuneaceae Lejeuneaceae is the largest family of liverworts. Most of its members are epiphytes found in the tropics, while others can be found in temperate regions. The main characteristics of the family are that: #The leaves are incubous. #Amphigastrium ...

) in Lejeune's honor in 1820.

Botanical works

* ''Flore des environs de Spa'', 1811 - Flora native to the environs of

Spa A spa is a location where mineral-rich spring water (and sometimes seawater) is used to give medicinal baths. Spa towns or spa resorts (including hot springs resorts) typically offer various health treatments, which are also known as balneoth ...

. * ''Revue de la flore des environs de Spa'', 1824 - Review of flora native to the environs of Spa. * ''De Libertia, novo graminum genere, Commentatio'' 1825 - On the genus ''

Libertia ''Libertia'' is a genus of monocotyledonous plants in the family Iridaceae, first described as a genus in 1824.

''. * ''Compendium florae belgicae'' (with Richard Courtois); Leodii, Apud P. J. Collardin, 1828–1836 - Compendium of Belgian flora.Biodiversity Heritage Library
publications

References

External links

IPNI
List of plants described and co-described vy Lejeune. {{DEFAULTSORT:Lejeune, Alexandre Louis Simon 1779 births 1858 deaths People from Verviers 19th-century Belgian botanists Scientists of the Austrian Netherlands