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Thread: cp noob needs help distinguishing two petiolaris species... pics would help.

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    i dont do pots. amphirion's Avatar
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    cp noob needs help distinguishing two petiolaris species... pics would help.

    hello everyone,

    was wondering if i could get some cleared air regarding this subject matter-- how does one distinguish D. petiolaris with D. diliatatopetiolaris? cpphotofinder doesnt really help much as there is either too many pictures to sift through or nothing, at least that i see. reading taxonomic differences leave me scratching my head. would definitely appreciate info from someone who possesses both of these species to give me a side by side comparison of the leaves, flowers, size, whatever...

    much appreciated. cheers.
    " You keep using that word. I do not think it means what you think it means." -Inigo Montoya
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    mcmcnair's Avatar
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    I've wondered this myself. I have both in my collection and they are about the same size and coloration. The only thing I have noticed is that petiolaris seems to get a little bigger. Sorry that wasn't much help maybe there's a difference in petiole length or something like that
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    Hello, I must be going... Not a Number's Avatar
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    Download this file and key the characteristics out:
    http://lrm.nt.gov.au/__data/assets/p...ROSERACEAE.pdf

    One of the main keys used to be linear/near linear petioles (D. petiolaris) vs oblanceolate petioles (D. dilatatopetiolaris). However Kondo's original diagnosis appears to be incomplete as the petioles on D. dilatatopetiolaris are polymorphic and change from linear to oblanceolate with the age and flowering of the plant. It appears that many plants keyed out as D. petiolaris may actually be D. dilatatopetiolaris.

    In Lowrie's paper New species in Drosera section Lasiocephala (Droseraceae) from tropical northern Australia (search for it online) his taxonomic key shows the significant characteristic if the petioles are linear on D. petiolaris are wooly hairs on the inflorescence (including scape). D. dilatatopetiolaris has simple branched hairs on the scape and wooly dendritic hairs on the sepals and pedicels.

    So if the petioles are oblanceolate it is most likely D. dilatatopetiolaris (check for simple branched hairs on the scape). If the petioles are linear/near linear it is D. petiolaris if the scape has wooly hairs.
    Last edited by Not a Number; 09-27-2012 at 09:50 AM.
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    i dont do pots. amphirion's Avatar
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    @NaN: thanks. downloaded. though the pdf only seems to detail D. dilatatopetiolaris extensively, and not much is given about D. petiolaris, although that could be all that is necessary. darn dilatatopetiolaris being polymorphic.

    i also wish my plants flowered. they have not done anything like the sort since i got them, which could help distinguish between the species.

    @mcmcnair: you say you have both? did you obtain them through a primary source or by trade? size could be a possibility for distinguishing species as well, as i hear petiolaris is the giant out of all other species.
    " You keep using that word. I do not think it means what you think it means." -Inigo Montoya
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    mcmcnair's Avatar
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    my dilatatopetiolaris I got in a trade with Smitty and my petiolaris I ordered from a european vendor.
    NCSU's Carnivore Nut
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    Mason M.
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    Hello, I must be going... Not a Number's Avatar
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    Here's de Candolle's original description from 1824:

    not really worth translating from Latin

    Lowrie cites these works in his papers:
    http://www.environment.gov.au/biodiv...lia/vol08.html
    http://www.publish.csiro.au/paper/BRU9800209.htm

    The book is out of print but you can find a used copy. A reprint of the journal article can be bought for $25
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    i dont do pots. amphirion's Avatar
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    @mcmcnair: ah...im debating whether to get the petiolaris. i guess i might just buy it just to complete the collection.

    so...just for clarification, if i understand how the system goes, this plant below is a diliatatopetiolaris, despite being labeled as petiolaris, due to its oblanceolate petioles?
    http://www.flickr.com/photos/44489466@N00/5481364427

    and this one, would be petiolaris?
    http://www.flickr.com/photos/55059208@N07/6362708665/
    " You keep using that word. I do not think it means what you think it means." -Inigo Montoya
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    Hello, I must be going... Not a Number's Avatar
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    I'd consider the leave Oblanceolate "Oblanceolate leaves are at least 3x longer than wide, but broadest above middle". http://cite.nwmissouri.edu/nworc/fil...ape_print.html

    So either D. dilatatopetiolaris, D. aff dilatatopetiolaris or a hybrid more likely than D. petiolaris. But I'm no botanist or taxonimist. Leaf shape might be "near linear".
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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