I'm not sure Myriam!
Emilia coccinae is a synonym of Emilia javanica
here
On USDA they are treated as separate species..
http://plants.usda.gov/java/pr...
http://plants.usda.gov/java/pr...
3 species in the US in Emilia..
http://plants.usda.gov/java/pr...
So Emilia fosbergii is a species in it's own right, the foliage on E. coccinea is different too.
http://www.hear.org/molokai/ka...
http://intermountainbiota.org/...
http://zojeczka.wordpress.com/...
You can fid the two species in Brazil in Asteraceae trib. Senecioneae.
Asteraceae Emilia fosbergii Nicolson
Asteraceae Emilia sonchifolia (L.) DC. ex Wight
http://translate.google.co.uk/...
