HUTCHINSON SYSTEM OF CLASSIFICATION DR. PIYUSH KUMAR RAI - - PowerPoint PPT Presentation

HUTCHINSON SYSTEM OF CLASSIFICATION

• DR. PIYUSH KUMAR RAI

DEPARTMENT OF BOTANY SEMESTER - IV PAPER - BOT CC410 PATNA WOMEN’S COLLEGE PATNA UNIVERSITY, PATNA

JOHN HUTCHINSON (1884-1972) A British Botanist Who was Associated with the Royal Botanic Garden at Kew, England

• He proposed a system of Classification which was based on Bentham and

Hooker and Bessey.

• It is the best know and accepted Phylogenetic system of classification.
• He orginally presented the system in his two volume work The families of

flowering plants.

• Vol – 1 : Dealing with the Dicotyledons in (1926)
• Vol- 2 : Dealing with the Monocotyledons in (1934)
• It was revised in 1948 in his British Flowering Plants and

again in his second edition of The Familier of Flowering plants.

PRINCIPLE ADOPTED BY HUTCHINSON (1959)

• Evolution of both upward and downward .
• Evolution does not necessarily involve all organs of

the plant at the same time .

• Evolution has generally been consistent
• Tree and shrub are probably more Primitive than

herbs .

• Perennial are older than biennial .
• Aquatic flowering plants are as rule more recent than

terrestrial and the same may be said of epiphytes, saprophytes and Parasities .

• Collateral vascular bundles arranged in a cylinder.

• Leaves precede compound leaves.
• Bisexual precede unisexual flower and the dioecious is

probably more recent than the monoecious condition.

• Solitary flower is more Primitive and form it syncarpy has

resulted .

OUT LINE OF HUTCHINSON CLASSIFICATION

• Phylum : Angiospermae
• Sub phylum l : Dicotyledons
• Division I : Lignosae (54 order) : Order 1 Magnoliales-

Order 54 Vertenales.

• Division ll : Herbaceae : Order 55 Ranales- order 82

Lamiales.

• Subphylum Il : Monocotyledons
• Division l: Calyciferae (12 order) : Order 83 Butomater to
• rder 94 .
• Division ll: Corolliferae (14 order) : order 95 liliales to
• rder 108 orchidales
• Division lll: Glumiflorae (3 order) : order 109: juncales to
• rder 111 Graminales.

MERIT OF HUTCHINSON SYSTEM OF CLASSIFICATION

• The families and order in the this system are if small size

and comprise only very closely texa .

• This system is in conformity with the modern view of the

Phylogeny of Angiosperm as it considers the Ranales and Mognoliales as the starting point among dicot.

• In this system monocot are discussed after dicots .
• Reshuffling or genera and families.
• Placing of gymnosperm before angiosperms in flowering

plants .

DEMERITS OF HUTCHINSON SYSTEM OF CLASSIFICATON

• Dicots have been divided into two major groups Lignosae

and Herbaceae in this system . This kind of classification is

• utdated as the habit used to be the main basis of

classification in the past era of Aristotle.

• Secondly it also the families that have close affinities.
• This system is not much utility from the point of view of

plant classification.

Thank – you