Nice information Pankaj ji
On Mon, Oct 21, 2013 at 7:30 PM, D.S Rawat <[email protected]>wrote: > Very useful information. > Dendrobium is well represented in Uttarakhand and D.amoenum is one of the > beautiful species in temperate forests. > DSRawat Pantnagar > > > On Monday, October 21, 2013 7:22:08 PM UTC+5:30, Dr Pankaj Kumar wrote: > >> Dendrobium is a huge genus of orchids. It was established by Olof >> Swartz in 1799 and today contains about 1,200 species. The genus >> occurs in diverse habitats throughout much of south, east and >> southeast Asia, including the Philippines, Borneo, Australia, New >> Guinea, Vietnam, Solomon Islands and New Zealand. The name is from the >> Greek dendron ("tree") and bios ("life"); it means "one who lives on >> trees", or, essentially, "epiphyte". >> In 1981, Briegar reclassified all terete-leaved Dendrobiums from >> Australia and New Guinea into a new genus, Dockrillia. The Winika >> orchid from New Zealand was formerly D. cunninghamii, but has now been >> moved into a monotypic genus Winika. In 1989, Clements upgraded the D. >> speciosum complex into individual species;[1] similarly, the D. >> bigibbum complex (which contains the well-known Cooktown Orchid of >> Australia, D. phalaenopsis) has recently been split up. However, as an >> illustration of the current revisions in the taxonomy of Orchidaceae >> these 'splits' have now been reversed and the currently accepted >> species, natural nothospecies and synonyms are presented on >> Wikispecies Dendrobium. >> >> Description >> Dendrobium species are either epiphytic, or occasionally lithophytic. >> They have adapted to a wide variety of habitats, from the high >> altitudes in the Himalayan mountains to lowland tropical forests and >> even to the dry climate of the Australian desert. >> >> This genus of sympodial orchids develop pseudobulbs, which vary in >> length from under a centimetre (e.g. Dendrobium leucocyanum) to >> several metres long (e.g. Dendrobium discolor), resembling canes. A >> few grow into long reedlike stems. Leaf bases form sheaths that >> completely envelope the stem. In the section Formosae (e.g. Dendrobium >> infundibulum), the sheaths and undersides of leaves are covered with >> fine short black hairs. Other species (e.g. Dendrobium senile), are >> covered with fine white hairs. >> >> In selected species, the short, ovate leaves grow alternately over the >> whole length of the stems, in others, the leaves are bunched towards >> the apex of the stem (e.g. Dendrobium tetragonum). The axillary >> inflorescence vary in length from insignificant to 1m long, and can >> carry from a few (1-4) (e.g. Dendrobium nobile) to as many as 100 >> (e.g. Dendrobium speciosum) flowers. Deciduous species carry their >> leaves for one to two years then typically flower on leafless canes, >> while canes of evergreen species usually flower in the second year and >> can continue to flower for a number of years (e.g. Dendrobium >> densiflorum). >> >> These orchids grow quickly throughout summer, but take a rest during >> winter. Dormant buds erupt into shoots from the base of the pseudobulb >> mainly in spring, and a few species in autumn. This is then followed >> by rapid growth of new roots. Reproduction is usually through seed, >> but a few species reproduce asexually through keikis produced along >> the stem, usually after flowering and sometimes as a result of injury >> to the growing tip. >> >> >> Source: >> http://en.wikipedia.org/wiki/**Dendrobium<http://en.wikipedia.org/wiki/Dendrobium> >> >> Best regards >> Pankaj >> >> -- >> ************************************************************* >> Pankaj Kumar, Ph.D. >> IUCN-SSC Orchid Specialist Group Asia >> >> Office: >> Conservation Officer >> Orchid Conservation Section >> Flora Conservation Department >> Kadoorie Farm and Botanic Garden (KFBG) Corporation >> Lam Kam Road, Tai Po, New Territories, Hong Kong. >> Residence: >> 151, 1st Floor, Tai Om Tsuen >> Lam Tsuen, Tai Po, New Territories, Hong Kong. >> >> email: [email protected]; [email protected] >> Phone: +852 2483 7128 (office - 8:30am to 5:00pm); +852 9436 6251 >> (mobile). Fax: +852 2483 7194 >> > -- > You received this message because you are subscribed to the Google Groups > "efloraofindia" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/indiantreepix. > For more options, visit https://groups.google.com/groups/opt_out. > -- Regards Dr Balkar Singh Head, Deptt. of Botany and Biotechnology & Horticulture Incharge Arya P G College, Panipat Haryana-132103 09416262964 -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/indiantreepix. For more options, visit https://groups.google.com/groups/opt_out.
