There's also a link to Flora SBS on the Flora de Catarina site Myriam, I hadn't looked around the site before but now having done so I agree it's very good!
Some of the sites I find seem to be impossible to go to a 'home' page, the one showing the nettles is a site I once had (from the last time!) and I found the site from the web address, but whichever link you click on it takes you to a search box only!
http://www.ufrgs.br/fitoecolog...
http://www.ufrgs.br/fitoecolog...
