I bought seeds from Alan Yusupov (Theaquatank) 5 spieces : 
Eriocaulon sp. (Polaris),
Eriocaulon sp. from An son river, 
Eriocaulon sp. Udontanichibioni,
Eriocaulon sp. Hainan Island, 
Eriocaulon sp. Amami Oshima
but when eriocaulon grow to this size I understand that I have only one spieces  :(...