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  • 7 Post By Dorsetman
  • 1 Post By Chris in Hamilton
  • 2 Post By Dorsetman
  • 1 Post By ksriramkumar
  • 2 Post By Dorsetman

Dendrobium topaziacum

This is a discussion on Dendrobium topaziacum within the Cattleyas, Vandas, Dendrobiums IN BLOOM forums, part of the Orchid Photography category; I decided to extend my collection of Dendrobium species last year, and this is one ...

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  1. #1
    Dorsetman's Avatar
    Dorsetman is offline Senior Member
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    Default Dendrobium topaziacum

    Name:  Den-topaziacum.1.jpg
Views: 316
Size:  96.5 KBName:  Den-topaziacum.2.jpg
Views: 207
Size:  98.7 KBName:  Den-topaziacum.3.jpg
Views: 202
Size:  149.1 KBName:  Den-topaziacum.4.jpg
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Size:  55.8 KB

    I decided to extend my collection of Dendrobium species last year, and this is one of the ones I bought. I had expected a different colour - I had thought of topaz as a blue precious stone , but when I googled it just now, I found there are yellow ones too. My growth has extended the 2nd cane , now maybe 22 inches high, and produced 4 flower buds - each having a cluster of flowers, on the original , now leafless cane, which is some 15 inches high. seem to be quite long lasting.

  2. #2
    Chris in Hamilton's Avatar
    Chris in Hamilton is offline Senior Member
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    Lovely! Funny, when I think of topaz I always imagine a yellow stone.

  3. #3
    78Terp's Avatar
    78Terp is offline An Avant Gardner
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    I agree with Chris on both points. Lovely and also think of yellow/gold color as topaz.

  4. #4
    ksriramkumar is offline Senior Member
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    Looks awesome. I think the correct ID is Dendrobium bullenianum. topaziacum is a synonym.IOSPE PHOTOS

  5. #5
    Dorsetman's Avatar
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    There is an interesting and arguable question here. Synonymy does not. imply that one name is wrong !
    By way of illustration, odontoglossum crispum is an obsolete name, not a synonym for oncidium alexanderii.
    But the two are one and the same species, in their "when I was a young orchid grower" and current versions.

    Recently I had a discussion about "two" other dendrobium species,namely sulawiense and glomeratum. They were and perhaps still are ( if the situation has not changed very recently ) considered synonyms ( by the RHS. ,which is the International Authority on orchid names, and they are advised on taxonomy of species by Kew ) and the basis for that synonymy is the basis that they look to be identical, and insufficient is known about other factors which are taken into account, i.e where the two grow, etc. Looks are of course the basis of Morphological taxonomy, which is all we have in the absence cellular biology of the species in question . Now if they are sequenced, or at least the plastids are , which is the bit they do for the purpose, the dna profiles are compared, and if found to be insufficiently different , then priority will Dictate that the earlier of the two names is used and the other name will be obsolete, not synonymous. If otherwise, then there are two species : but until they are sequenced, then the two names exist as synonymous names.

    This discussion by the way was with a couple of members of the RHS orchid committee, and started off after one of them showed me, and sold to me a hybrid said to between glomeratum and some other species, and I commented that he flower looked identical to the sulawiense I have. He agreed that it was , and added that the other parent did not seem to have contributed anything, and then we went on to discuss synonymy as mentioned above.

  6. #6
    JDT's Avatar
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    Beautiful no matter the name or color, added to my wish list!

  7. #7
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    Really cool looking clusters on the canes. Very pretty, Geoff!

  8. #8
    ksriramkumar is offline Senior Member
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    Thanks for sharing this Geoff. I was not aware of this aspect of obsolete name and sequencing. I had recently flowered Dendrobium crassinode Benth. & Rchb. f. 1869 and I was told Dendrobium pendulum Roxb. 1832 is the correct name.

    I was given to understand that the same Dendrobium was identified by 2 different taxonomists. in this case, in 1832 first identified as pendulum and subsequently in 1869 as crassinode and hence the correct name should be Dendrobium pendulum Roxb. 1832

    Does this mean now that Dendrobium crassinode Benth. & Rchb is a obsolete name or does it mean that sequencing for these two are not compared yet?. Pls help me understand

    Quote Originally Posted by Dorsetman View Post
    There is an interesting and arguable question here. Synonymy does not. imply that one name is wrong !
    By way of illustration, odontoglossum crispum is an obsolete name, not a synonym for oncidium alexanderii.
    But the two are one and the same species, in their "when I was a young orchid grower" and current versions.

    Recently I had a discussion about "two" other dendrobium species,namely sulawiense and glomeratum. They were and perhaps still are ( if the situation has not changed very recently ) considered synonyms ( by the RHS. ,which is the International Authority on orchid names, and they are advised on taxonomy of species by Kew ) and the basis for that synonymy is the basis that they look to be identical, and insufficient is known about other factors which are taken into account, i.e where the two grow, etc. Looks are of course the basis of Morphological taxonomy, which is all we have in the absence cellular biology of the species in question . Now if they are sequenced, or at least the plastids are , which is the bit they do for the purpose, the dna profiles are compared, and if found to be insufficiently different , then priority will Dictate that the earlier of the two names is used and the other name will be obsolete, not synonymous. If otherwise, then there are two species : but until they are sequenced, then the two names exist as synonymous names.

    This discussion by the way was with a couple of members of the RHS orchid committee, and started off after one of them showed me, and sold to me a hybrid said to between glomeratum and some other species, and I commented that he flower looked identical to the sulawiense I have. He agreed that it was , and added that the other parent did not seem to have contributed anything, and then we went on to discuss synonymy as mentioned above.

  9. #9
    Dorsetman's Avatar
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    There is a Kew website - apps.kew.org which carries the World Checklist of monocotyledons . I looked up your two names on this, and the difference in reporting is quite interesting.
    D.crassinode is listed, ( published by Benson - who I think was a British soldier/explorer in the first half of the 19th century - a Major-General - Vanda bensonae is one he found and reported it as a marvel - growing happily in full sun, in a temperature up to 40 C....
    But D. pendulum is listed as "This name is accepted" - it was published by Roxburgh, 1832. So here it does look as though pendulum is correct, and crassinode is obsolete.

    I e-mailed a guy at Kew who is in this area - taxonomy etc - for his comments about all this ; if and when I get a response, I;'ll add it here.

  10. #10
    ksriramkumar is offline Senior Member
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    Thank you Geoff. I learned one more new aspect today about apps.kew.org. Thanks a ton. Appreciate your insight and thoughts.

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  2. Dendrobium bullenianum aka D. topaziacum
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    Last Post: November 7th, 2006, 08:27 AM

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