Unlabelled in the Botanical garden of Rio de Janeiro. I know so little about palms, don't know where to start for searching..

https://www.google.cz/search?q...
https://commons.wikimedia.org/...

Thanks Stefan, it could very well be an Oil Palm, but I see the seeds of Elaeis guineensis has 'spikes' in between which mine lack...
a crop:



also the leaf stems of mine son't have the spikes either, shown on some of the pictures from your link..

https://www.google.cz/search?q...

Another picture I found..

Attalea rostrata looks a good bet ... check out the seeds.

http://www.palmpedia.net/wiki/...

My first thought was possibly Pandanus: http://garden.org/plants/searc... but I really don't know Palms and have no clue if that particular species grows in Brazil.

LOL, pay attention to Janet!

My other thought would be Bactris but I have no clue if that grows in Brazil either.

http://www.plantapalm.com/vpe/...

Certainly not a Bactris sp. Lin, they do have nasty spikes that can really hurt! The genus does grow a lot in Brazil but this was in a botanical garden which has species from any similar tropical country..
I think you got it spot on Janet, once again!
The pictures of the seeds in your link really do look like a perfect match!
Thank you!

I recognised the palm from a photo ...

https://www.palms.org/gallery....

Nice collection of Palm photos on that site Janet, they might be of use for others that still need an id! thanks!