Question

merits and demerits of Conquist's system of classification​

Answer 1

Answer:

Merits:-

There is general agreement of Cronquist’s system with that of other contemporary systems like Takhtajan. Dahlgren and Thorne.

Detailed information on anatomy, ultra structure phytochemistry and chromosome morphology was presented in the revision of the classification in 1981 and 1988

The system is highly phylogenetic.

Nomenclature is in accordance with the ICBN.

The family Asteraceae in Dicotyledons and Orchidaceae in Monocotyledons are generally regarded as advanced and are rightly placed towards the end of respective groups.

The relationships of different groups have been described with diagrams which provide valuable information on relative advancement and size of the various subclasses,

The family Winteraceae (vessel-less wood present similar to Pteridosperms) placed at the beginning of dicotyledons is favoured by many authors.

The subclass Magnoliidae is considered as the most primitive group of Dicotyledons. The placement of Dicotyledons before Monocotyledons finds general agreements with modem authors

As the text is in English, the system has been readily adopted in different books.

Demerits:-

Though highly phylogenetic and popular in U.S.A., this system is not very useful for identification and adoption in Herbaria since Indented keys for genera are not provided.

Dahlgren (1983, 89) and Thorne (1980, 83) treated angiosperms in the rank of a class and not that of a division

Superorder as a rank above order has not been recognised here, though it is present in other contemporary cinssifications like Takhtajan, Thorne and Dahlgren

The subclass Asteridae represents a loose assemblage of several diverse sympetalous fanvities.

Ehrendorfer (1983) pointed out that the subclass Hamamelidae does not represent an ancient side branch of the subclass Magnoliidae, but is remnant of a transition from Magnoliidae to Dilleniidae, Rosidae, and Asteridae.

There is a difference in opinion with other authors regarding the systematic position of some orders like Typhales, Arales. Urticales etc.

Explanation:

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