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

  1. #9
    RL7836's Avatar
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    I never completely understood the delineation between the two. There were some plants that were obviously dilatatopetiolaris but Sean Spence felt strongly that the plant above also fell into this designation iirc. The conversations on CPUK are probably still available with a search... (or pm him for his thoughts).
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  2. #10
    Hello, I must be going... Not a Number's Avatar
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    Looking at the first picture again with a few hours in-between I'd now say the petioles are linear/near linear. Ha ha, that's how it goes. There is no scale but I'd guess the petioles are 2mm-4mm in width. Without inflorescence using Lowrie's key this is the best I can do:

    3 Leaves at anthesis densely covered with appressed hairs; petiole hidden by
    the dense hairy covering .............................................................................................................. 4
    3 Leaves at anthesis sparsely covered with appressed hairs; petiole visible
    through the hairy covering........................................................................................................... 6


    6 Lamina reniform, 15-20 mm wide .................................................................................. D. falconeri
    6 Lamina orbicular, suborbicular or transversely broadly elliptic to very
    broadly ovate, 2.5-7 mm wide ....................................................................................................... 7

    7 Lamina transversely broadly elliptic to very broadly ovate, 5.5-7 mm
    wide leaves appressed to the soil surface ................................................................ D. kenneallyi
    7 Lamina orbicular or suborbicular, 2.5-3.5 mm wide; leaves of the
    rosette more or less horizontal to the soil surface or erect to semi-erect ..................................... 8

    8 Leaves of the rosette more or less horizontal to the soil surface.................................................. 9
    8 Leaves of the rosette erect to semi-erect .................................................................................... 10
    9 Inflorescence (including scape) 5-15 cm long ........................................................D. darwinensis
    9 Inflorescence (including scape) 30-40 cm long........................................................ D. brevicornis

    10 Petiole oblanceolate ................................................................................................................... 11
    10 Petiole linear ............................................................................................................................... 12

    11 Inflorescence (including scape) up to 18 cm long; pedicels
    3-7 mm long ................................................................................................... D. dilatato-petiolaris
    11 Inflorescence (including scape) up to 45 cm long; pedicels
    1-2 mm long ........................................................................................................................D. fulva
    12 Inflorescence (including scape) glabrous .............................................................. D. broomensis
    12 Inflorescence (including scape) covered with woolly hairs ....................................... D. petiolaris


    With the second plant, again without benefit of scale or inflorescence from Lowrie's Key:

    3 Leaves at anthesis densely covered with appressed hairs; petiole hidden by
    the dense hairy covering .............................................................................................................. 4

    3 Leaves at anthesis sparsely covered with appressed hairs; petiole visible
    through the hairy covering........................................................................................................... 6
    4 Petiole oblanceolate, 2-4 mm wide ............................................................................... D. ordensis
    4 Petiole linear or very narrowly oblanceolate, < 2 mm wide ........................................................... 5
    5 Petiole linear, covered with dendritic hairs ..................................................................... D. lanata
    5 Petiole very narrowly oblanceolate, covered with non-dendritic hairs..................... D. derbyensis

    6 Lamina reniform, 15-20 mm wide .................................................................................. D. falconeri
    6 Lamina orbicular, suborbicular or transversely broadly elliptic to very
    broadly ovate, 2.5-7 mm wide ....................................................................................................... 7

    7 Lamina transversely broadly elliptic to very broadly ovate, 5.5-7 mm
    wide leaves appressed to the soil surface ................................................................ D. kenneallyi
    7 Lamina orbicular or suborbicular, 2.5-3.5 mm wide; leaves of the
    rosette more or less horizontal to the soil surface or erect to semi-erect ..................................... 8
    8 Leaves of the rosette more or less horizontal to the soil surface.................................................. 9

    8 Leaves of the rosette erect to semi-erect .................................................................................... 10
    9 Inflorescence (including scape) 5-15 cm long ........................................................D. darwinensis
    9 Inflorescence (including scape) 30-40 cm long........................................................ D. brevicornis

    10 Petiole oblanceolate ................................................................................................................... 11
    10 Petiole linear ............................................................................................................................... 12
    11 Inflorescence (including scape) up to 18 cm long; pedicels
    3-7 mm long ................................................................................................... D. dilatato-petiolaris
    11 Inflorescence (including scape) up to 45 cm long; pedicels
    1-2 mm long ........................................................................................................................D. fulva
    12 Inflorescence (including scape) glabrous .............................................................. D. broomensis
    12 Inflorescence (including scape) covered with woolly hairs ....................................... D. petiolaris



    Identifying species through 1 or 2 photographs is difficult. Not enough of the fine detail may be visible and the angle may not show if the leaves are semi-erect or not. This also illustrates the pitfalls of trying to identify species by comparing your plants to photographs. The appearance of a plant can vary tremendously due to the age, health and growing conditions. And often the photos are mislabeled or the plant pictured incorrectly identified to begin with.

    Sean Spence however is someone whose opinion on Drosera ID I well respect. He has the years of experience and expertise to be able to eyeball species from photographs with a high degree of accuracy. He is a member here, though seldom posts these days.

    It would also appear from the above key the inflorescence on D. dilatatopetiolaris is much shorter than D. petiolaris - only up to 18cm
    Last edited by Not a Number; 09-27-2012 at 04:29 PM.
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  3. #11
    i dont do pots. amphirion's Avatar
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    thanks a lot NaN. so basically the real tell tale sign would be inflorescences based on the key.
    " You keep using that word. I do not think it means what you think it means." -Inigo Montoya
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  4. #12
    Hello, I must be going... Not a Number's Avatar
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    A qualified es, unless there is a newer key.

    I guess if it doesn't fall into Lowrie's key it is either a hybrid or an affinis.
    Last edited by Not a Number; 09-27-2012 at 04:36 PM.
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