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Thread: Drosera ascendens - villosa - graomogolensis

  1. #1

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    Hi!

    Can anyone please tell me how to distinguish between Drosea ascendens, graomogolensis and villosa ? By looking on Fernando Rivadavia's pictures ( http://www.mcef.ep.usp.br/carnivo....sa.html ) i suppose the following :

    Drosera villosa is getting really big with upright leaves (similar to Drosera venusta). The petioles are longer, than in the other two.

    Drosera graomogolensis ist stem-forming.

    Drosera ascendens (or villosa ssp ascendens) doesn't form a stem and grows as a rosette.

    Are there any differences in the flowers or seeds as well ?

    Based on this, i would say, the plant i'm growing is not Drosera villosa, but Drosera ascendens. Here are two pictures :

    higher resolution


    higher resolution

    Christian

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    Hi Christian,

    Well, if you adopt Dr. Schlauer's revision of Drosera species as published in the 1995 CPN, then your plant must be legitimately referred to as simply D. villosa. There is no legitimate variteal status assigned to any members of D. villosa.

    For horticulturalists, we need to seggregate the different location forms: D. villosa is very variable across its range. Some have longer petioles, some less so. The plant in the photo appears to be the form found in the Serra Do Caparao according to personal communication with Fernando. This is the most commonly cultivated form in circulation, but there are others as well from different locations. All are simply D. villosa as far as legitimate publication are concerened.

    D. graomogolensis seems rather less variable from what I have seen. As to specific differences, there are many. Most obvious is the overall general form, D. graomogolensis has a more upright character, superficially similar to D. venusta, whereas the D. villosa you have forms flatter rosettes of a greater circumference. D. graomogolensis has shorter petioles as well.

    There are differences in both flowers and seeds as well. There are fine line drawings in the Silva and Giulietti's "LLevantamento Das Droseraceae do Brasil" Bol. Bot. Univ., Sao Paulo 16: 75-105 1997.

    In the photo below, D. graomogolensis is on the lower left, D. villosa "var. ascendens" is on the right. Don't go by the color, both plants become equally as red. The D. graomogolensis in the photo was recently acquired when this photo was taken.




    Some additional photos of these species in habitat may be found on my website at:

    http://f1.pg.photos.yahoo.com/ph.....view=t

    These come courtesy of Robert Gibson and Fernando Rivadavia: Robert provided the photos, and Fernando edited the photos for accuracy. If you are a yahoo member, you can view the full file size (sign up is free and worth it to be able to see them. Yahoo mail also offers free webspace, in case you are interested, and I am on Yahoo messenger service as well.).



    "Grow More, Share More"

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    Hello all, Zach here,
    not to add to this confusion, but Christian, your plants look very similar to my D.montana tomentosa. My plants have grown quite green from a lack of light, but the leaves are around the same shape and petiole length is about the same size. Any ideas?
    Taproot, Anti-Flag, The Casualties, Alkaline Trio, Eleventeen, Deadsy, AFI...what's not to love?

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    errr, scratch that lol,

    I have looked more closely to my plants (montana,) and it is indeed different. Sorry for any confusion (darn, thought I had villosa for a sec [img]http://www.**********.com/iB_html312/non-cgi/emoticons/blues.gif[/img] )

    Christian, do you have any extra plant (s) for trade? I am trying to collect some South American dews now, but all I have are sessiflora and montana tomentosa. Thanks all-Zach
    Taproot, Anti-Flag, The Casualties, Alkaline Trio, Eleventeen, Deadsy, AFI...what's not to love?

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    Yes, the lamina of D. montana var tomentosa are much more round, and the petioles much shorter than in D. villosa, but similar to D. graomogolensis except not held erect.

    Zach, my plants should flower next season and I will be glad to send some seed of this species when I get it. I know how hard it is to find these plants.







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    nice plant Tamlin,
    I do indeed see the differences in size of the petioles. My tomesntosa's are putting up some scapes, so I'll have seed soon as well. Thanks-Zach
    Taproot, Anti-Flag, The Casualties, Alkaline Trio, Eleventeen, Deadsy, AFI...what's not to love?

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    Zach,

    It must be a seasonal thing for D. montana var tomentosa as mine are flowering too. Do you know the location origin of your plants? Maybe we could swap seed. My plants which are putting up scapes are from Diamantina, and were collected there last fall by Robert and Fernando. I am surprised they are flowering at such a small size, and a little more than a year after sowing the seed!
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    Hi Tamlin,
    Sorry, but my tomentosa don't have any locational information with them. All I can say is that they were purchased at a bacps meeting and that they are quite hairy. Thanks-Zach
    Taproot, Anti-Flag, The Casualties, Alkaline Trio, Eleventeen, Deadsy, AFI...what's not to love?

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