Evolution of Eryngium alpinum population

[Antonin]

I work on Eryngium alpinum (APIACEES) and the the part of the reproduction system on the evolution of the population. I am looking for reference of studies and articles on this plants. 
If someone could sugest me some article, it should be wonderfull.
Tanks
Antonin
antonin.rivat at wanadoo.fr
arivat at bio-ens.ujf-grenoble.fr