At first i thought this was a Begonia because of the leaf shape but..the stems contradict this..
It was growing at the foot of a steep huge rock in the shade where also begonias grow.
Any idea what family it could belong to?

This could be Anthurium Myriam , look at some on the Hawiian Botanical Gardens ..

http://www.htbg.com/search.php...

A google for "Anthurium Atlantic Rainforest" brought up one result on Flora do Brasil, Anthurium lacerdae. I couldn't find any images on google images, but went a couple of pages into the web search and found a pdf with some on. It doesn't fit this one but I haven't looked at what else there is. It is terrestrial, and the climbing, branching form is similar to another on the pdf

http://floradobrasil.jbrj.gov....

http://fm2.fieldmuseum.org/pla...

The list for Rio de Janeiro ..

http://floradobrasil.jbrj.gov....

Anthurium aduncum: can't find photos.

Anthurium augustinum: if correct, not a match.

https://mariarina.wordpress.co...

Anthurium binotii : photo on Flora do Brasil, doesn't match.

Anthurium bragae: photo on site, no match.

Anthurium comtum: photo on site, no match

Anthurium coriaceum: photo on site, no match

Anthurium eichleri: no photo but I found a description on a site with species! It is terrestrial, and leaves narrow, 60-70cm long, the description 'could' fit.

http://araceae.e-monocot.org/t...

Found specimens .. the leaf base probably doesn't match.

http://science.mnhn.fr/institu...

Anthurium galeotti: description doesn't fit.

http://araceae.e-monocot.org/t...

Anthurium harrisii: not a match ..

http://allesingruen.board-4you...

http://plantillustrations.org/...

http://plantillustrations.org/...

Anthurium inconspicuum: no match

http://science.mnhn.fr/taxon/s...

http://science.mnhn.fr/taxon/g...

Anthurium intermedium: photo on site not a match

Anthurium langsdorffii: photo on site not a match

Anthurium laucheanum: specimen not a match, but the shape is similar to your other plant!

http://science.mnhn.fr/institu...

http://science.mnhn.fr/all/lis...

http://araceae.e-monocot.org/t...

I have to take a rest at this point!

Anthurium lhotzkyanum: no match

http://araceae.e-monocot.org/t...

Anthurium longicuspidatum: photo on site no match

Anthurium longifolium: no match

http://science.mnhn.fr/all/lis...

Anthurium lucidum: photo on site no match

Anthurium luschnathianum: no match

http://araceae.e-monocot.org/t...

Anthurium marense: photo on site no match

Anthurium maricense: photo on site no match

Anthurium maximilianii: no match

http://araceae.e-monocot.org/t...

http://science.mnhn.fr/institu...

Anthurium microphyllum: no match

http://science.mnhn.fr/institu...

Anthurium minarum: no match

http://science.mnhn.fr/institu...

http://araceae.e-monocot.org/t...

Anthurium miquelianum: photo on site no match

Anthurium nitidulum: no match

http://araceae.e-monocot.org/t...

http://science.mnhn.fr/institu...

Anthurium organense: photo on site no match

http://araceae.e-monocot.org/t...

Anthurium parasiticum: photo on site no match

Anthurium parvum: photo on site no match

Anthurium pentaphyllum: photo on site no match

Anthurium polynervium: photo on site no match

Anthurium purpureum: description doesn't match

http://araceae.e-monocot.org/t...

Anthurium scandens: photo on site no match

Anthurium sellowianum: photo on site no match

Anthurium simonii: don't think so

http://floradobrasil.jbrj.gov....

http://araceae.e-monocot.org/t...

Anthurium solitarium: photo on site no match

Anthurium sucrii: no match

http://www.br.fgov.be/research...

Anthurium urvilleanum: yours! no match



Anthurium validinervium: no match

http://floradobrasil.jbrj.gov....

http://araceae.e-monocot.org/t...

That's the Anthuriums checked! Now the rest.

WOW, Janet!!!!
I think this is 'Mission Impossible'
so much for your hard research work!

I don't think it's going to be mission possible Myriam.

At least there is a list now to refer to in case you have an Anthurium.

Thanks for the acorns.

I do have Anthuriums to be identified Janet, I've already broken my head over them..

While trying to get some Pipers identified I came upon this one: Piper truncatum.
http://floradobrasil.jbrj.gov....
it resembles my plant so well, the only thing is that the leaves on mine are so shiny and I don't see that in the photo of the 'Flora do Brasil'.

I saw now there were two more pictures and on the last one you can see the hairy stem and leaf petioles, mine is not hairy so this one it cannot be..