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
>
> 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] <javascript:>; [email protected] <javascript:>
> Phone: +852 2483 7128 (office - 8:30am to 5:00pm); +852 9436 6251
> (mobile). Fax: +852 2483 7194
>
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