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 U.sandwithii : a new species for French Guyana 
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Registrado em: 23.01.2010(Sáb)3:48
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Localização: Cayenne - French Guyana
Mensagem U.sandwithii : a new species for French Guyana
hello friends,

by following this link :http://guyane-l.over-blog.com/pages/Utricularia_sandwithii-7911120.html
you'll be able to watch some pix of a new species I found in my country :D

the plant belongs to the section Aranella , wich includes species like U.simulans, U.fimbriata or the well known U.blanchetii...

an interesting point is that this species is not mentionned in the Taylor as beiing present in my country : in fact, the monography tells us that the distribution of this plant englobes Surinam, (englich) Guyana, Venezuela and Brazil (Roraima territory)

another mentionable point is the fact that the plants from French Guyana are in flower during the months of may and june, whilst the other populations are producing their flowers from august to december, something like 6 months later.....

last but not least, the Taylor tells us that U.sandwithii has a dark red peduncle, like on the pictures taken by F.Rivadavia from a brazilian population : http://users.humboldt.edu/rziemer/Rivadavia/U.sandwithii%20Platanal%2010.jpg
of course, our plants are different ! their peducle is of a bright green....even the calyx !

enjoy !

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04.07.2012(Qua)22:45
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Registrado em: 02.01.2006(Seg)21:02
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Mensagem Re: U.sandwithii : a new species for French Guyana
Hi Patrice,

good work! I could not find the differences from it to the U. simulans, even if the 'Taylor' in my hands.

Regards.

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04.07.2012(Qua)23:39
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Registrado em: 25.03.2012(Dom)0:44
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Mensagem Re: U.sandwithii : a new species for French Guyana
Hi Patrice, legally you have discovered this carnivorous plant in your country. This shows how nature is capable of surprising us. So long and good luck to you and your culture.

Abs,

Rodrigo F. Costa

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05.07.2012(Qui)0:09
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Mensagem Re: U.sandwithii : a new species for French Guyana
Are you sure this is not U.simulans?


05.07.2012(Qui)0:38
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Mensagem Re: U.sandwithii : a new species for French Guyana
hi,

thanks for your comments !

Carlos, you are right, it's difficult to make a difference between both species, and I was 3 or 4 time in the fields to take pictures and to take samples....

Fernando : I took some samples of the plants, and examinated them thorough a microscope....the most differences between U.simulans and U.sandwithii is the shape of the corolla, but there is another "detail" I closely watched to : I speak about the scales.
the scales I found on thoose plants are similar to them from : Taylor - fig.61 - detail#5 and 4

I also examinated U.simulans the same way, and it's bracts are exactly the same as : Taylor - fig.59 - detail #5

another point is that both plants grow together, side by side, and flourisch during the same period, and you see it in situ that they are pretty different, in :
- size
- color
- shape of the corolla

last but not least, I told Andreas about the anatomic details I found, and he confirmed it's ID as beiing U.sandwithii.

but it's an intriging plant, because of the lack of red in some parts of the plant : the calyx, and the peduncle, wich schould be red, according to the Taylors....

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05.07.2012(Qui)22:13
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Mensagem Re: U.sandwithii : a new species for French Guyana
Patrice,

I certainly don't doubt that this species exists in Fr.Guiana (nor am I crazy enough to doubt Andreas F.!!), I just wanted to know how you came to that conclusion - and it definitely seems like you've done your homework, congratulations!! ;)

This species is so under-studied, that I'm not very surprised that you found a form that appears to have different colored scapes. But who knows, this could be something new taxonomically or maybe even some sort of hybrid with U.simulans.

Keep up the good work (and keep posting pics!)!
Fernando


05.07.2012(Qui)23:04
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Mensagem Re: U.sandwithii : a new species for French Guyana
Great Discovery Patrice, thanks for sharing :)

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06.07.2012(Sex)17:01
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Mensagem Re: U.sandwithii : a new species for French Guyana
hi ,

well, Fernando, you have been a light in the night of no-ledge for years now in our community, and your fellows are slowly climbing the tree of know-ledge....

yes, as you said I did my homework /psica

it's a perticular job to try identificating a plant, and a non-specialist as I am have to be carrefull....that's what i'm trying to do, led by some good persons like you, who offer their time and their knowledge and spread their tricks since years. I hope I have been a good student, and I hope I'll learn much more within the next years.

well, I must also say that IDing a plant requires some special tools : I have many books, an internet connection that runs, time, a microscope, a binocular, and all the additive stuff used when you deal with optics....it's not easy, it's costfull, but I do my efforts to increase my knowledge.

concerning the plant : you are right when you speak about introgression....the plant looks pretty "different" from them on your pictures, and that mainly mean that there is "something" special about it, if considered from a botanical point of view....but I'm not keen enough in botanics to say something about it :roll:

I'll try to drew some pictures of the material I have, and maybe I'll find some interesting details.

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06.07.2012(Sex)23:07
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Mensagem Re: U.sandwithii : a new species for French Guyana
Patrice,

Because of the importance of your discovery, I just wanted to remind you to please make herbarium of this species and give it to one of your local botanical institutions, as a first official record for Fr.Guiana.

Once again congratulations! ;)


Best wishes,
Fernando Rivadavia


12.12.2013(Qui)2:09
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