a brief report of flora of north-east india state . with examples
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WWF has identified the entire Eastern Himalayas as a priority Global 200 ecoregion. Conservation International has upscaled the Eastern Himalaya hotspot to include all the eight states of Northeast India, along with the neighbouring countries of Bhutan, southern China and Myanmar.
The region has been identified by the Indian Council of Agricultural Research as a center of rice germplasm. The National Bureau of Plant Genetic Resources (NBPGR), India, has highlighted the region as being rich in wild relatives of crop plants. It is the center of origin of citrus fruits. Two primitive variety of maize, Sikkim Primitive 1 and 2, have been reported from Sikkim (Dhawan, 1964). Although jhum cultivation, a traditional system of agriculture, is often cited as a reason for the loss of forest cover of the region, this primary agricultural economic activity practiced by local tribes supported the cultivation of 35 varieties of crops. The region is rich in medicinal plants and many other rare and endangered taxa. Its high endemism in both higher plants, vertebrates, and avian diversity has qualified it as a biodiversity hotspot.
The following figures highlight the biodiversity significance of the region:[41]
51 forest types are found in the region, broadly classified into six major types – tropical moist deciduous forests, tropical semi-evergreen forests, tropical wet evergreen forests, subtropical forests, temperate forests, and alpine forests.
Out of the nine important vegetation types of India, six are found in the North Eastern Region.
These forests harbor 8,000 out of 15,000 species of flowering plants. In floral species richness, the highest diversity is reported from the states of Arunachal Pradesh (5000 species) and Sikkim (4500 species) amongst the North Eastern states.
According to the Indian Red Data Book, published by the Botanical Survey of India, 10 percent of the flowering plants in the country are endangered. Of the 1500 endangered floral species, 800 are reported from Northeast India.
Most of the North Eastern states have more than 60% of their area under forest cover, a minimum suggested coverage for the hill states in the country in order to protect from erosion.
Northeast India is a part of Indo-Burma hotspot. This hotspot is the second largest in the world, next only to the Mediterranean Basin, with an area 2,206,000 square kilometres (852,000 sq mi) among the 25 identified.[citation