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  • 4 Post By Dorsetman
  • 2 Post By Chris in Hamilton
  • 1 Post By zainal abidin
  • 1 Post By JDT
  • 2 Post By Dorsetman

Name my dendrobium species...?

This is a discussion on Name my dendrobium species...? within the Cattleyas, Vandas, Dendrobiums IN BLOOM forums, part of the Orchid Photography category; A freebie, at one of my Societies - an ex-member brought in his plants and ...

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  1. #1
    Dorsetman's Avatar
    Dorsetman is offline Senior Member
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    Default Name my dendrobium species...?

    Name:  plant.jpg
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    A freebie, at one of my Societies - an ex-member brought in his plants and said help yourself... latelled as D.thyrsiflorum- Costa Rica - which was obviously wrong from the beginning ( Dendrobium is an old world genera not new world). But the plant did look like thyrsiflorum - spindle shaped bulbs, deeply ridged - perhaps a few more terminal leaves than usual, but maybe some kind of natural variant.
    But now it has flowered it is all wrong ; spike should be drooping - pendant, not upright. Flowers should be creamy white with a contrasting lip.

    Looks as though it had only ever flowered once before -only the latest three or four and largest bulbs are mine, so it was quite a big plant already ; no wonder the guy gave up !

    But what is it ? The Section is fairly clear, but I don't know of any flora dealing with Dendrobiums Section-by-Section. They are always alphabetical, and with 1500 or so species to trawl through, that would be a task and a half.
    So I thought I would draw on the expertise of members here ...

    Suggestions please ?

  2. #2
    Chris in Hamilton's Avatar
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    Looks like chrysotoxum Geoff. IOSPE PHOTOS Perhaps the spike would be more pendant if it were longer?

  3. #3
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    I concur with Chris.

  4. #4
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    I have 2 varieties of the chrysotoxum but unfortunately they have not bloomed for me yet still a little young, I am hoping that next spring they will. The only thing I can say is that the PB's and leaves do not look like yours, but yours is so much more matured so not sure.

    Beautiful blooms none the less!

  6. #6
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    I did think of chrysotoxum, but find it easy to get muddled between all the many yellow dendrobiums flowering in the Spring. So I looked at IOSPE. and for chrysotoxum, Jay says "with clustered, grooved, clavate or fusiform, to 12" [30 cm] long, many angled, apically thickened pseudobulbs enveloped by many white, membraneous sheaths carrying 2 to 3 , towards the apex, oblong to lanceolate, coriaceous, acute leaves . This quite wrong - no way are these spindle shaped bulbs described as clavate or fusiform . It is also quite noticeable that there are no white membraneous sheaths. And 2-3 leaves ? More like 9 or 10.

    I don't think we have got there yet !

  7. #7
    ksriramkumar is offline Senior Member
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    Cane on this looks smooth and does not match with chrysotoxum. Looks like a hybrid of chrysotoxum to me. Looking at the shape of the flower, I would imagine some aggregatum there too. may be chrysotoxum x aggregatum?

  8. #8
    Dorsetman's Avatar
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    Quote Originally Posted by ksriramkumar View Post
    Cane on this looks smooth and does not match with chrysotoxum. Looks like a hybrid of chrysotoxum to me. Looking at the shape of the flower, I would imagine some aggregatum there too. may be chrysotoxum x aggregatum?
    I just explored that possibility in Orchidwiz ; I have seen the two groing together in the wild, so thought that maybe a natural hybrid was known , but no.
    But the images for chrysotoxum, interestingly. include several with upright spikes, and several with canes very much like mine. So maybe this has been a wild goose chase. It is what it said.

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