Diversity and Ecology of Dendrobiums (Orchidaceae) in Chotanagpur Plateau, India (original) (raw)
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Taiwania, 2011
As part of All India Coordinated Research Project on Taxonomy of orchids (AICOPTAX) Chotanagpur Plateau was surveyed extensively for documentation of orchid species and distribution during 2002 -2006. Sixty three species were collected from the study area with Dendrobium as one of the largest group of epiphytic orchids comprising of 11 species, namely, Dendrobium aphyllum, D. bicameratum, D. cucullatum, D. crepidatum, D. formosum, D. fimbriatum, D. herbaceum, D. moschatum, D. peguanum, D. regium and D. transparens. Most of the species were found in the Sal (Shorea robusta) dominated forests. Stratified Random Sampling was used for ecological studies in the forested regions on the plateau. Results show that D. aphyllum was the most common amongst 11 species and it was distributed through out the altitudinal gradient, whereas, rest of the orchid species were found to be localised at comparatively higher altitudes. D. herbaceum was always found on the upper areas of the plateaus between 900-1000 m asl. D. crepidatum was seen in both epiphytic as well as lithophytic conditions, whereas D. moschatum were found growing as lithophytes along the streams. Rest of the species were epithytic. The paper also deals with some microhabitat features governing the distribution of these orchids on the plateau along with their key for identification.
Morphological diversity within Dendrobium (Orchidaceae) of Nepal
Annals of Plant Sciences, 2021
The morphological diversity within Dendrobium Sw., comprising 29 species of Nepal Himalaya, is presented. The paper provides detailed information about the range of diversity in vegetative and reproductive characteristics. An artificial key to the species is provided for their identification. According to the updated classification of Orchidaceae, genera like Epigeneium and Flickingeria of subtribe Dendrobiinae are merged into genus Dendrobium sensu lato. In the present investigation, the morphological diversity within 29 species of Dendrobium viz. D
Dendrobium tuensangense, a new species of Orchidaceae from Nagaland, Northeast India
Phytotaxa, 2017
Dendrobium tuensangense N. Odyuo & C. Deori (Orchidaceae), a new species from Tuensang district of Nagaland, Northeast India is described and illustrated. The new species is similar to D. dantaniense Guillaumin but differs in having uniformly elongate, slender stems, floral bracts ovate to elliptic acuminate, obtuse, shorter than the ovary and pedicel; sepals and petals pale cream coloured; side lobes papillose on dorsal and ventral side, papillae purplish, fan shaped, very broad, apex obtuse, margin erose; midlobe apex narrower, 1 mm broad; anther head with an acute projection of 0.5 mm long. It is also similar to Dendrobium bicameratum Lindl. but differs in having uniformly elongate, slender stems, an acute projection of 0.5 mm long on the anther head, sepals and petals pale cream coloured; side lobes papillose on dorsal and ventral side, papillae purplish, fan shaped, very broad, obtuse, margin erose.
The present paper deals with sixteen species of Indian Dendrobium Sw. from the Northeastern regions which are economically important from aesthetic value related industry. The detailed morphological characterization and the reproductive phenology are discussed. Vegetative characters reveal sizeable variations among the species which can be differentiated from one another. The height of the psuedobulb stem with nodes and internodes ranges from 15 cm to 130 cm, the maximum height was recorded in D. moschatum. The sessile lanceolate leaves with a maximum length were recorded in D. moschatum. The longest inflorescence was found in D. clavatum, interestingly in Dendrobium the longer the inflorescence the more the numbers of flower bearing. The flowers were exquisite and showy which exhibit different shapes and colours, the largest flower was recorded in D. formosum. Most of the species began to sprout new shoots during spring season. The low temperature, rainfall and humidity promote the flower bud initiation except in D. nobile, and D. heterocarpum favoured by moderate temperature and high humidity. The longevity of the flower ranges from 5 to 23 days with a maximum recorded in D. formosum. Post fertilization phenophase is the longest period exhibited by all the species under study, for instance seedpod initiation to maturity ranges from 56 to 120 days.
Dendrobium longicornu: an addition to the orchid flora of
Dendrobium is one of the largest genera of the Orchidaceae. Hitherto, 116 species of the genus have been reported from India, of which 17 (including 2 doubtful taxa) have been recorded from Western Himalaya and 7 from the Askot Wildlife Sanctuary (AWS). By this publication, we add Dendrobium longicornu to the flora of Western Himalaya. Résumé Dendrobium longicornu : une espèce supplémentaire pour la flore de l'Himalaya occidental-Le genre Dendrobium est l'un des genres les plus vastes parmi les Orchidaceae. Jusqu'ici 116 espèces ont été enregistrées pour l'Inde, dont 17 (en comptant deux taxons douteux) pour l'Himalaya occidental et 7 pour le sanctuaire AWS (Askot Wildlife Sanctuary). Le présent article ajoute une espèce, Dendrobium longicornu, à la flore de l'Himalaya occidental.