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  • 4 Post By mr. suarez

Ceraia hymenantha

This is a discussion on Ceraia hymenantha within the Orchids of Other Genera IN BLOOM forums, part of the Orchid Photography category; This is a small and very compact, low-altitude Dendrobium relative that is widespread from Myanmar ...

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  1. #1
    mr. suarez's Avatar
    mr. suarez is offline Senior Member
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    Default Ceraia hymenantha

    This is a small and very compact, low-altitude Dendrobium relative that is widespread from Myanmar to the Philippines. The flowers are 1.7 cm across, very sweetly fragrant and lasts for only one day- although during rainy periods these blooms last for up to two. There are several flowering flushes during the bloom period, which takes place from May to July, and September to December.

    This species was previously known as Dendrobium hymenanthum. I made the move from Dendrobium to Ceraia in the German orchid magazine OrchideenJournal early last year. The species name was taken from two Greek words: hymen (membrane), and anthos (flower)- a reference to the thinly-textured flowers.

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  2. #2
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    Wally your close up photos so nice, em...again keep changing the classification and nomenclature.

  3. #3
    kiwiorchids's Avatar
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    grrr doesnt that just grind your gears! i am sick of nomenclature changes......it looks like it should be classed as dendrobium, reminiscient of kingianum, but you cant please em all!
    very pretty though! now i need to update my wishlist

  4. #4
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    Well, taxonomy will continue to evolve as long as science is around. Ceraia is actually a very old genus- erected in 1790 as Ceraja and is in fact older than Dendrobium which was founded in 1799- and encompasses species which are vegetatively and florally different from what we can call true dendrobiums. I know this is very generalized, but the differences include the following: stems which may or may not have pseudobulbs (vs. pseudobublous stems throughout in Dendrobium), persistent leaves (vs. deciduous), flowers which appear repeatedly from the same stem and inflorescence (you don't find this feature in the true dendrobiums), and small to medium-sized flowers that are short-lived (vs. medium-sized to large and long-lasting). Furthermore, many species in Ceraia flower in response to sudden changes in temperatures, like after heavy rains for instance, whereas Dendrobium bloom according to seasons.

    Nomenclature changes is also a matter of sticking to one's guns, on the part of the author. And if there are no such people who are willing to take the trouble, then all slipper orchids would have been under Cypripedium up to now, and currently accepted genera such as Psychopsis, Psygmorchis and Lockhardtia will still be referred to as oncidiums. Nevertheless it is still up to the user whether these changes will be accepted or not, because after all, these are essentially all just propositions.

  5. #5
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    uh huh, i see now. we just had an expert speaker at the orchid society tonight, and he told us the basic identification key of a Dendrobium. The first and foremost point was the lib has three lobes, 2 on the sides, and then the tip of the lip. This has very VERY small side lobes and very little in the way of one at the tip of the lip. Is this a section of Dendrobium? i noted "vs. pseudobublous stems throughout in Dendrobium" and Dockrillias have rhizomes with leaves, no pseudobulbs at all, yet they are a part of the wider Dendrobium genus.

  6. #6
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    Hi Jordan,

    I am interested to know who the expert speaker is, but furthermore I am a bit puzzled by the 'basic identification key' for Dendrobium, which includes a three-lobed lip. If you look at the cluster of species which comprise section Dendrobium, you will notice that the labellum is hardly three-lobed- in fact they are best described as 'entire', or having no lobes; at best these 'lobes' are vaguely defined. What then are these species? These are the ones centered around D. moniliforme, the type species for the genus Dendrobium. Dendrobium anosmum, D. cucullatum and D. nobile are just some of these related entities. If you have flowers of these, I suggest you tear out the labella then lay them flat on a table to gauge if the lip is truly and clearly three-lobed, or if it is just a figment of a healthy imagination.

    Just recently, a paper was published where a widely circumscribed Dendrobium is once again proposed. For a number of reasons, the arguments for a greater Dendrobium has not met wide approval amongst other students of orchidology because it is too widely defined that it allowed the inclusion of too many distinct plant groups which have nothing to do with the type section and its satellite groups. For example, Cadetia (a thread on Cadetia taylori is in this forum, maybe we can use this species to see how similar it is to D. moniliforme and its allies)), Flickingeria, among others have been incorporated into a greater Dendrobium. To quote a respected orchidologist friend of mine (who is also active in this forum), it would seem that "the taxonomy in the Dendrobiinae is now done with eyes shut".

    Wally

  7. #7
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    Wally, what beautiful flowers, and you really capture the thinness of the petals. It looks like it's not more than one cell deep in places! I also appreciate the knowledge you impart. The more I learn, the more I realize I need to learn! Thank you for all you share.

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    really lovely those and thanks for info Wally!

  9. #9
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    Great information Wally and a pretty orchid bloom! THanks!!

    Cheers,
    BD

  10. #10
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    Lovely flower and a great info Wally....

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