One of the charms of the old parts of the Rio de Janeiro town, are the very tall old walls where all kind of interesting volunteer plants find their haven in the cracks..This was in the Santa Teresa area..
The greyish leaves made me think of Euphorbiaceae but the seedpods and flowers probably don't match that family, I couldn't take a close-up of the flowers as they were too high above my head..
Anyone recognizes it?

That's Nicotiana glauca, Tree Tobacco.

http://en.wikipedia.org/wiki/N...

It's being used in Hawai'i to save the endangered Hawaiian Hawkmoth, as it's natural host is almost extinct.

That is it!
Thanks a lot Dave!
Interesting info on Wiki too!

I wanted to write a look on Family: Solanaceae
But Dave was faster
Euphorbiaceae well out gum milk
czech prysec - welloutman