Thanks for that link Stefan, I had it before but somehow lost it..
I believe 'my' plants look like Philodendron lanceolatum like pictured by Marcus Nadrus who say it is in the collection of the Botanical garden of Rio. But he also consideres it as a synonym of P. crassinervium
The blooms though of the two species are different as shown further on in the article and the one shown of P.lanceolatum looks like 'mine' I have to make a crop of it, but it might not come out very well, as those pics are already cropped versions..
What a confusion though..
the crop..
Did you notice that same pic of P.lanceolatum on the Exotic Rainforest site also shows the plant leaves as growing in a rosette? Or is that a false impression?
I also had thought of the possibility of it being Anthurium lin and Swayback..
Those guards also worked on my nerves Swayback, I agree the guards cannot let run the public wild, but they can exaggerate, especially when it's obvious a person only shows genuine interest in a plant.