Euphorbia

[Rolland Douzet]

Dear all,

Thanks to all those who gave me thier help for the phylogeny and 
distribution of the Brachypodium pinnatum complex.

Now, I'm looking for help about a taxonomical problem

Linné discribed 3 species of prostrates Euphorbia from India (he said)

Euphorbia hirta L.
Euphorbia pilulifera L.
Euphorbia hypericifolia L.

I'd like to know if those 3 taxa are different ones or not. the 
nomenclature is quite complex and  sometimes they are considered as 
synonyms and sometimes not.

Thanks a lot.

R. DOUZET