Armen Takhtajan (born 1910), aka Armen Leonovich Takhtadjan or Takhtadzhian, is a Soviet-Armenian botanist, one of the most important figures in 20th Century plant evolution and systematics and biogeography. His other interests include morphology of flowering plants, paleobotany, and the flora of the Caucasus.-1... Soviet redirects here. ... Botany is the scientific study of plant life. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999 in the... Divisions Land plants (embryophytes) Non-vascular plants (bryophytes) Marchantiophyta - liverworts Anthocerotophyta - hornworts Bryophyta - mosses Vascular plants (tracheophytes) Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongues Seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering plants Adiantum pedatum (a fern... A speculative phylogenetic tree of all living things, based on rRNA gene data, showing the separation of the three domains, bacteria, archaea and eukaryotes. ... Plant taxonomy is the science that finds, describes, classifies and names plants. ... Biogeography is the science which deals with patterns of species distribution and the processes that result in such patterns. ... Comparative anatomy is the study of similarities and differences in organisms. ... Classes Magnoliopsida- Dicots Liliopsida- Monocots The flowering plants (also called angiosperms) are a major group of land plants. ... Paleobotany (from the Greek words paleon = old and botanikos = of herbs) is the branch of paleontology dealing with the recovery and identification of plant remains from geological contexts, and their use in the reconstruction of past environments and the history of life. ... The Entholinguistic patchwork of the modern Caucasus - CIA map The Caucasus, a region bordering Asia Minor, is located between the Black Sea and the Caspian Sea which includes the Caucasus Mountains and surrounding lowlands. ...

Takhtajan worked at the Komarov Botanical Institute in Leningrad, where he developed his 1940 classification scheme for flowering plants, which emphasized phylogenetic relationships between plants. His system did not become known to botanists in the West until after 1950, and in the late 1950s he began a correspondence and collaboration with the prominent American botanist Arthur Cronquist, whose plant classification scheme was heavily influenced by his collaboration with Takhtajan and other botanists at Komarov. The Komarov Botanical Institute is the leading botanical institution in Russia. ... Saint Petersburg (Russian: Санкт-Петербу́рг, English transliteration: Sankt-Peterburg), colloquially known as Питер (transliterated Piter), formerly known as Leningrad (Ленингра́д, 1924–1991) and Petrograd (Петрогра́д, 1914–1924), is a city located in Northwestern Russia on the delta of the river Neva at the east end of the Gulf of Finland... 1940 (MCMXL) was a leap year starting on Monday (the link is to a full 1940 calendar). ... Classes Magnoliopsida- Dicots Liliopsida- Monocots The flowering plants (also called angiosperms) are a major group of land plants. ... A phylogeny (or phylogenesis) is the origin and evolution of a set of organisms, usually of a species. ... The term Western world or the West can have multiple meanings depending on its context. ... 1950 (MCML) was a common year starting on Sunday (link will take you to calendar). ... // Events and trends This map shows two essential global spheres during the Cold War in 1959. ... Arthur C. Cronquist (1919–1992) was a North American botanist who wrote An Integrated System of Classification of Flowering Plants (1981) and The Evolution and Classification of Flowering Plants (1988). ...

The "Takhtajan system" of flowering plant classification treats flowering plants as a division (phylum), Magnoliophyta, with two classes, Magnoliopsida (dicots) and Liliopsida (monocots). These two classes are subdivided into subclasses, and then superorders, orders, and families. The Takhtajan system is similar to the Cronquist system, but with somewhat greater complexity at the higher levels. He favors smaller orders and families, to allow character and evolutionary relationships to be more easily grasped. The Takhtajan classification system remains influential; it is used, for example, by the Montréal Botanical Garden. A system of plant taxonomy, the Takhtajan system of plant classification was published by Armen Takhtajan, in several versions from the 1950s onwards. ... This article discusses categorisations of organisms. ... Classes Magnoliopsida- Dicots Liliopsida- Monocots The flowering plants (also called angiosperms) are a major group of land plants. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Magnoliopsida is the botanical name for a class: this name is formed by replacing the termination -aceae in the name Magnoliaceae by the termination -opsida (Art 16 of the ICBN). ... Liliopsida is the botanical name for a class. ... The Cronquist system is a scheme for the classification of flowering plants (or angiosperms). ... Some weeping willows at the Montreal Botanical Garden The Jardin botanique de Montréal or Montreal Botanical Garden is a large botanical garden in Montreal, Quebec, Canada. ...

Takhtajan also developed a system of floristic regions. A floristic province is a geographic area with a relatively uniform composition of plant species. ...

Takhtajan is a member of the Russian Academy of Sciences, as well as a foreign associate of the U.S. National Academy of Sciences since 1971. When authorship is included in citing botanical names the standard abbreviation Takht. may be attached to the names he has published. Russian Academy of Sciences: main building Russian Academy of Sciences (Росси́йская Акаде́мия Нау́к) is the national academy of Russia. ... President Harding and the National Academy of Sciences at the White House, Washington, DC, April 1921 The National Academy of Sciences (NAS) is a corporation in the United States whose members serve pro bono as advisers to the nation on science, engineering, and medicine. ... 1971 (MCMLXXI) was a common year starting on Friday (the link is to a full 1971 calendar). ... In botanical nomenclature, author citation refers to the person (or team) who valid published the name, i. ...

Selected works

• A. Takhtajan, Th.J. Crovello and A. Cronquist (1986). Floristic Regions of the World.
• A. Takhtajan (1991). Evolutionary Trends in Flowering Plants
• A. Takhtajan (1997) Diversity and Classification of Flowering Plants