I used the home page of Flora do Brazil Myriam, then click the green button on the bottom for 'Brazilian Flora Checklist'.
http://reflora.jbrj.gov.br/jab...
The page you get is what I originally had in my favourites, choose Angiosperms in the Group tab, and Orchidaceae in Family then click search. It was on page 3 for me.
http://reflora.jbrj.gov.br/jab...
