Generally in the flora of any region content two major components one is its endemic plants content and the other is the exotic and naturalized floristic elements, besides these there are some some plants which are originated in that region and then it spread to other country. Dr. D. Chatterjee (1940 and 1960) in his work exhibit the route of migration of different floristic elements from different parts of the world in India. I am very interesting to know such migration route of the plants from different parts of the world to India and also wants a list of the exotic plants of the Indian subcontinent along with their native country and the time of immigration.
It need to see the book of
Vavilov, L. E. Rodin, Semyon Reznick, Paul Stapleton, Doris Love.
1997.
Five Continents .
this book, published in English, contains descriptions by Academician NI Vavilov of the expeditions he made between 1916 and 1940 to five continents, in search of new agricultural plants and confirmation of his theories on plant genetic diversity.
Dear Sunit Mitra,
Please go through the attachment for the answer.
Best of Luck
The biogeographical classification of India has been attempted variously by earlier workers (Hooker 1854, Clarke 1898, Chatterjee 1940, Puri 1960, Rodgers & Panwar I988, Rao 1994). They have unanimously pointed out the enormous variation in vegetation pattern. According to Rodgers and Panwar (1988) the Indian region is divided into 10 biogeographic zones, each with its own unique but distinct natural vegetation representing three basic biomes and two natural realms as identified by Udvardy (1975).
The flowering plants of India represent 6% of the world’s known flowering plants (Nayar 1977). However, after critical analysis, subsequent phyto-geographers have convincingly concluded that India has a flora of its own and as many as 33% taxa of Indian flora are endemic to the present political boundaries of India. The total endemic genera represent 6.5% in India. For understanding the migration route of plants from different parts of the world to India following valuable publication may help you:
1. Hajra P K and Rao R R .1990. Distribution of vegetation types in northwest Himalaya with brief remarks on phytogeography and floral resource conservation; Proc. Indian Acad. Sci. 100 263-277.
2. Jain S K .1986. The grass flora of India - A synoptic account of uses and phytogeography; Bnll. Bot. Snro. India 28 229-240.
3. Nayar M P. 1977. Changing patterns of Indian Flora; Bull. Bot. Surv. India 19 145-154.
4. Nayar M P. 1980. Endemism and patterns of distribution of endemic genera (angiosperms); 1'. Econ. Tax. Bot. pp. 199-110.
5. Rao R R. 1994. Biodiversity in India (Floristic Aspects) pp. 315 (Dehra Dun : Bishen Singh Mahendra Pal Singh).
6. Rao R R. 1997. Diversity of Indian flora. Proc. Indian Acad. Sci. B 63: 127-138.
7. Schuster R M. 1976. Plate Tectonics and its bearing on the Geographical Origin and Dispersal of Angiosperms; in Origin and Early Evolution of Angiosperms pp. 48-138 ed C B Beck (London: Columbia Univer. Press).
Dear Arvind
Tahnks to provide me the necessary LIterature, but my query is not answered, in your literature you mentio that Arnebia hispidissima DC. is an Exotic and Coldenia procumbens L. is a Native of the VAranasi District, but my question is how can explain what is the native place of Arnebia when and how it comes to my country. I need this literature.
with regards
Sunit
Exotic flora are either introduced deliberately or accidentally. In India Parthenium hysterophorus was introduced accidentally with imported food grains from USA while Lantana camara and Eichhornia crassipes were introduced deliberately as ornamental plants.
Please go through the attachment which may be helpful to you. Also go through the following research articles.
1. Nagar, PS, SJ Pathak and SM Pandya (2004). The alien flora of the Barda hills and its surroundings in Gujarat, India. Indian Journal of Forestry 27(1): 25-38.
2. Tomar, A, H Singh and V Singh (2008). Exotic elements in the flora of Baghpat district, Uttar Pradesh. Indian Journal of Forestry 31(3): 463-471.
I would suggest: Floristic regions of the World (1986) by Takhtajan. He uses endemic plant families/genera/species to delineate floristic regions.
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