Q. Show Takhtajans System of Classification?
Another important phytogenetic system was proposed by Takhtajan, the famous Russian Palaeobotanist working at Komarov Botanical Institute, Leningrad, U.S.S.R. For the first time he proposed the system in 1942rnainly based o n the structural types of Gynoecium and placentation. Afterwards, he put forward a modified system in 1954 in Russian language and then the translated version of English in 1958. This modified system was mainly based on phylogenetic principles. Soon after he made another attempt to revise the system in the light of evolutionary trends in Angiosperms, which appeared in 1964. This, too, was not the last word but Takhtajan again revised and updated version of his system appeared in 1980.
Before we take into account the outline of the system it seems proper to point out the important and significant points of the system as new terms were employed by Takhtajan in his system:
i) Magnoliophyta (Angiosperms) are regarded to be monophyletic in origin.
ii ) Magnoliopsida (Dicots) are considered as a primitive group than Liliopsida (Monocots).
1) Mognoliophyta (Angiosperms) has 419 Families and is divided into 2 classes viz.
i) Magn,oliopsida (Dicots) and
ii) Liliopsida (Monocots)
2) Magnoliopsida (Dicots) is further divided into 7 subclasses, 20 super orders, 71 Orders and 342 Familes.