A. A. Mao , J. Y. Yumnam , R. Gogoi , A. Pinokiyo

Abstract

Status and distribution of Rhododendrons in a fragile ecosystem (temperate mixed forest and sub-alpine forest) of Mount Esii and surrounding hill ranges were studied. Not surprisingly, these hill ranges supported 8 taxa of Rhododendrons having varied status in the world (2 endemic and endangered, 2 endemic and rare, 1 rare and 3 common taxa). Within the study area, they showed contiguous pattern of distribution and their occurrence were most prominent within the altitudinal range 2,700-2,820m. amsl The local endemic species, Rhododendron macabeanum had highest density (11.9), most frequent in its occurrence (80 %) and also possessed greatest IVI (132.48) thereby acting as the dominant cover among the species of Rhododendron in these hill ranges. Majority of the remaining taxa (R. maddenii ssp. Crassum and R. elliottii; R. triflorum var. bauhiniiflorum and R. johnstoneanum) showed a high degree of competition for space and nutrients and consequently characterized by slow growth rate. These hill ranges proved to be an efficient habitat for Rhododendrons and will serve the purpose of in-situ conservation of Rhododendrons in general and endemic ones in particular. The endemic and endangered or rare species with low IVI (R. triflorum var. bauhiniiflorum, R. johnstoneanum and R. elliottii) should be given immediate attention for ex-situ conservation.

Keywords

Rhododendrons, Endemic, Endangered, Mount Esii, Nagaland, Manipur

Full Text

     

A. A. Mao , R. Gogoi

Abstract

No abstract

Full Text

     

A. A. Mao , R. Gogoi

Abstract

Dzukou valley and surrounding hills situated between Manipur and Nagaland States are spread over an area of 27 sq. km. with a unique floristic wealth and biodiversity. The paper is an outcome of several exploration trips to the area. 335 species belonging to 223 genera and 114 families of sub-tropical evergreen, temperate and sub-alpine forest are enumerated. Of the taxa, two new generic record viz. Oriorchis Lindl. and Coeloglossum Hartm. For North East India and 24 species new record viz. Geranium tuberaria Jacquem, Malus sikkimensis (Wenzig) Balakr., Prunus rufa Hook.f., Astilbe rubra Hook.f. & Thomson.ex Hook.f., Rhododendron lepidotum Wall, ex G.Don, Rhododendron vaccinioides Hook.f., Primula deuteronana Craib, Primula stuartii Wall., Primula geraniifolia Hook.f., Euphorbia sikkimensis Boiss., Allium vietorialis L., Ligularia fischeri (Ledeb.) Turcz., Corybas himalaieus (King & Pantl.) Schltr., Oriorchis foliosa Lind., Parnasia wightiana Wall., Jasminum humile L. etc. for Nagaland and Manipur States. About 6% of the plants recorded were endemic to the area or endemic to eastern Himalaya.

Keywords

Floristic Study, Dzukou Valley And Surrounding Hills, Nagaland-Manipur, India

Full Text

     

R. Gogoi , Hussain Ahmed Barbhuiya

Abstract

During the present study a total of 29 species belonging to 18 genera from 10 families were recorded, out of which the family Pinaceae is found to be the largest with 7 species and 3 genera growing in the state. Out of 29 species 9 species are indigenous to the state and rest are introduced ones. All the indigenous species except Pinus kesiya showed depleting population in the wild and wanted its immediate and proper conservation.

Keywords

Gymnosperms, Meghalaya, Assam

Full Text

     

A. A. Mao , R. Gogoi

Abstract

The paper reports Lilium mackliniae, an endemic lily from north east India, its distribution and status in natural habitats. The main threats to the species and habitats due to frequent forest fire and rapid colonization by a dwarf bamboo after forest fire are discussed along with conservation measures which need to be taken for its protection.

Keywords

Lilium mackliniae, Endemic, Distribution, Status, North East India.

Full Text