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Brief Notes on World Floristic Region

Hansen (1920) divides 8 zones on either side of equator. The three latitude zohes are (1) Polar (2) Temperate (3) Tropical.

1280px-flora-at-cape-peninsula.jpg

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1. Equator:

0 -15.0 degree on either side of equator.

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2. Tropical zone:

15 – 23.5 degree on either side of equator.

3. Subtropical zone:

23.5 – 34.0 degree on either side of equator.

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4. Warm temperate zone:

34.0 – 45.0 degree on either side of equator.

5. Cold temperate zone:

45.0 – 58.0 degree on either side of equator.

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6. Subarctic zone:

58.0 – 66.5 degree on either side of equator.

7. Arctic zone:

66.5 – 72.0 degree on either side of equator.

8. Polar zone:

72.0 – 90 degree on either side of equator.

Distribution of Plant along altitudes:

0 – 600 m: Zone of plums & bananas.

600 – 1250 m: Tree ferns and figs.

1250 – 1900 m: Pines, miscellaneous.

1900 – 2600 m: Evergreen trees

2600 – 3200 m: Deciduous trees.

3200 – 3800 m: Coniferous trees.

3800 – 4450 m: Alpine shrubs.

4450 – 5050 m: Alpine herbs.

5050 – Above: Ice and snows.

Chief Vegetation Belt of the Earth

On the basis of climate and geographical conditions the earth is usually divided into four broad vegetation belts:

A. Arctic Zone: Two types:

1. Arctic proper: North Pole.

2. Sub arctic: Southern arctic to North Temperate Zone.

B. North Temperate Zone:

between 30°N latitude and 55°N latitude, two major zones:

(1) North temperate of the eastern zone:

04 zones:

(a) Western and Central Europe.

(b) Mediterranean

(c) Northern Africa.

(d) Himalayas, eastern Asia and Japan.

(2) North temperate to the Western hemisphere.

C. Tropical Zone:

Two sub zones –

(a) Palaeotropic –

(a) Tropical Africa, (b) Tropical Asia.

(b) Neotrophic

D. South Temperate Zone:

Africa, Australia, New Zealand.

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