User Tag List

Informational! Informational!:  0
Likes Likes:  0
Page 14 of 23 FirstFirst ... 4101112131415161718 ... LastLast
Results 105 to 112 of 181

Thread: South African Droserae

  1. #105

    Join Date
    Jul 2003
    Posts
    28
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I agree Mr T that location data would be of great relevance for the natalensis complex but we have two problems with this. There is oftem more than one collection made from a location ie (shire or county) that can not be elaborated on when distributing seed and secondly people like WAs prominent CP "expert" distribute plants/seed with bogus location data to protect location details for various reasons. Unless the collector can correctly identify a plant, there is mass confusion created and bogus names become species names and people end up growing rosetted things called D. affinis!
    I collected something recently from somewhere which roughly fits the description of something but differs in significant ways from the type. If I plan to send seed of this to people I will simply call it D. aff. whatever. I wont give location details untill it is studied further and if required a formal description given. I think the self proclaimed sundew god experienced frustrations with Drosera ID/distribution/location info/articles. I wish there was an easy way to avoid it.

  2. #106

    Join Date
    Jul 2003
    Posts
    28
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sean

    Good luck with D. pauciflora. It is difficult to self but you must do it yourself. Just move polen as often as you can and cross your fingers. Do you know what colour it is? Where did it come from? Would you like to trade a leaf cutting? Where in Aus are you?

    Plant your D. ascendens seed now. It should germinate immediately. No special treatment is required though smoke treatment may increase germination

    Thanks
    Greg

  3. #107

    Join Date
    Jul 2003
    Posts
    28
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Oh, by the way,

    I hybridised D. coccicaulis and natalensis last year. Plants will flower this season. They are quite strong growers so it will be interesting to see how big they get.

    D. madagascariensis x aliciae (plains or dry form) is going to be a beauty! Very fast growing. Plants are almost 3 feet across! Well not quite but I think it will be a good one!

    Greg

  4. #108

    Join Date
    Dec 2002
    Location
    Germany
    Posts
    361
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi,

    The first picture shows a leaf of my Drosera coccicaulis and the second of Drosera venusta.





    Greg, do you have pictures of your plants ? I am highly interested in seeing some of your plants.

    Pleae take a look to the pictures of Drosera natalensis, i posted in this thread (first post on page4) as wll. I would also like to discuss this species. Is anyone here growing a Drosera natalensis, that fits exactly the published Description ?

    Christian

  5. #109

    Join Date
    Jun 2003
    Location
    Melbourne Australia
    Posts
    127
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How hard is pauciflora to grow from leaf cuttings??

    If it is easy I'll be around at your house before you know it Seandew!! (and to think I just emailed you to find out your Nic!&#33[img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img]

    I sowed my "cunifolia" seeds today, half with a 48hr GA treatment. I will be inbterested to see the differences in germination.

    George

  6. #110

    Join Date
    Dec 2001
    Location
    Oswego, New York, U.S.A.
    Posts
    5,290
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Greg,

    Those are some very good points, and of course you are right: even from a single collection site there can be great variability within the populations. Even the "type" collection is only a part of the picture. Without pouring over herbarium sheets there is little hope of understanding what "typical" implies.

    Christian, this problem exactly highlights the difficulty you are having in trying to match your (or others) plants of D. natalensis to an "exact fit". I remain unconvinced that this is possible regarding the South African species. I expressed my own frustrations in this regard to Dr. Schlauer in trying to ascertain what a typical specimen of D. natalensis would be. He told me the populations in Madagascar are likely to be as pure an example as can be had.

    I just want to add that the use of "aff." is a very good descriptive tool. I have so many variations of D. dielsiana that I have taken to labeling most of them in this fashion. With every variation I grow comes a greater certainty that no private growers can claim to have a "true" form. Even those who review extensive sheets of collected material are often hard pressed in this regard: Key descriptions are based on extensive review of the field material, and this sort of experience collectors will never be able to access, not if we were to grow 300 plants! Use they keys as a guide, certainly but remember that the variability factor will always enter the equation.

    I recently asked Robert how one determines the most significant focus on these species: is it the styles, stipules or seeds? Is there some sort of point value assigned to these qualities the total of which adds up to a reasonably certain determination? His reply was that he too struggles to understand this same issue.

    "Variation in D. dielsiana, as with many other rosulate species of sundews shows how little we still know and understand species' limits and the relative weight of various factors. Clearly cytology data is not sufficient to explain most of this variation, and it now appears that even genetic sequencing may not be the great clarifier either given it is more than simple presence or absence of a gene that determines genotype, for it is how genes interact that morphology is also determined. Detailed field studies are needed of plants in the wild throughout their range to get an understanding and context of the variation we see in listed clones on innumerable seed lists. That many names attached to these seeds are often erroneous makes it even more challenging to understand what is going on when basing any study on cultivated material."

    " I feel that the taxonomic weight of some characters has been overplayed and that they vary greatly in accordance with only minor changes to the genotype (but have yet to test this hypothesis)". (Robert Gibson Pers. Comm.)"

    A "sticky" problem to be sure!



    "Grow More, Share More"

  7. #111

    Join Date
    Jul 2003
    Posts
    28
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    D. pauciflora leaf cuttings are very easy as are the related D. trinervia and cistiflora. Just pull rosette leaves frm the plant and cover the petiole with a little soil.

    I'lll dig up some pics this weekend. orry I can't do it any earlier.

    Greg

  8. #112

    Join Date
    Jul 2003
    Location
    Melbourne, Australia
    Posts
    698
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi George- aka binataboy.

    By the sounds of things the D. pauciflora should be relatively easy to propogate from leaf cuttings. Whenever you would like a leaf or two come and get em. By the way, I'm working on Friday so we may have to hold back a bit on the filedtrip.

    Regards,

    Sean.

Similar Threads

  1. South African Surprises
    By Not a Number in forum Sundews (Drosera), Byblis, Drosophyllum
    Replies: 7
    Last Post: 10-30-2009, 08:00 PM
  2. WHAT IS THIS SOUTH AFRICAN CARNIVORE?
    By terrestrial_man in forum General Discussions
    Replies: 30
    Last Post: 03-20-2007, 05:52 AM
  3. Seeking Droserae
    By setep in forum Carnivorous Plant Trading Post
    Replies: 2
    Last Post: 07-30-2006, 05:56 PM
  4. Seed Germination in South African Species
    By Tamlin Dawnstar in forum Sundews (Drosera), Byblis, Drosophyllum
    Replies: 1
    Last Post: 09-08-2002, 07:37 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •