Course - BSc Botany Semester - IV Paper name Plant Systematics/ - - PowerPoint PPT Presentation

• Course - BSc Botany
• Semester - IV
• Paper name – Plant Systematics/ BOT CC 410
• Topic – Hutchinson system of classification
• Faculty Name – Dr Piyush kumar Rai
• e.Mail I’d raipiyush518@gmail.com

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 known and accepted Phylogeqnetic 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 Families of Flowering plants.

PRINCIPLE ADOPTED BY HUTCHINSON (1959)

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

the plant at the same time .

• Evolution has generally been consistent
• Trees and shrubs are probably more primitive than

herbs .

• Perennials are older than biennials .
• 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 is primitive.

• Sìmple leaves precede compound leaves.
• Bisexual precede unisexual flower and the dioecious is probably more

recent than the monoecious condition.

• Solitary flower is primitive.
• Apocarpy is primitive and syncarpy is advanced

OUTLINE OF HUTCHINSON CLASSIFICATION

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

Order 54 Verbenales.

• Division ll : Herbaceae(28 orders) : Order 55 Ranales-
• rder 82 Lamiales.

• Subphylum Il : Monocotyledons
• Division l: Calyciferae (12 order) : Order 83 Butomales to
• rder 94 Zingiberales.
• 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 this system are of small size and comprise only

very closely related taxa .

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

Angiosperm as it considers the Ranales and Magnoliales as the starting points among dicot.

• Monocots are discussed after dicots in this system.

• Reshuffling of 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 separates the families that have close

affinities.

• This system has not much utility from the point of view of

plant classification.

Thank – you