Plant species found on different phytogeography lead to speciation and sometimes endemism also.But some morphological similarity will exist even though they were different species from the same genera. Then how geneflow occur in western ghats, eastern ghats, north and north eastern part of indian phytogeographical zones eventhough they consist of barriers like geographical gaps, plateaus and mountains ? is they have some other factors for speciation and endemism ?
Since the question is of a rather general nature the answer is also of a general nature. In conventional terms biogeographers have addressed such patterns in terms of the ancestor arriving before the current barriers or overcoming the barriers and dispersing between. One has to analyze case by case. The Winkworth et al paper is a good example of the age of taxa being under represented as molecular ages only give minimal divergence estimates so their model of recent evolution is suspect.
I would predict that many of the species and higher taxonomic differences between the regions of India go back to early Indian evolution, at least to the Oligocene/Eocene collection between India and Asia.
I nice tectonic example for India in animals is the frog family Sooglossidae found on the Seychelles and Nasikabattrachidae found in Western Ghats that forms a clade. The ancestor of these two groups would have inhabited the Seychelles-Western Ghats region before the Seychelles existed as islands or before Western Ghats existed as mountains. Interestingly geologists recently confirmed a sunken continental basement beneath the Seychelles region.
Biogéographie des plantes montre la voie d'isolement, s'il existe les barrières orographiques ou dans le cas des iles - barrière maritimes.
Autres facteurs pour la spéciation et l'endémisme - ce sont d'autres barrières :
morphologique - physiologyques - geneniques (pour la pollinisation croisée) etc.
Geological history of an area is the key - I fully agree with the comment by John Grehan.
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