Hello Vincent, Kew Plantlist gives the name as Hypericum imbricatum Poulter - original publication details: Notes Roy. Bot. Gard. Edinburgh 21: 183 1954. IPNI http://www.ipni.org/ipni/idPlantNameSearch.do?id=428482-1
Some links to holotype/Isotypes online http://plants.jstor.org/search?personName=16266 http://plants.jstor.org/specimen/e00327629?s=t http://plants.jstor.org/specimen/k000677145?s=t Several Flemish friends are growing this plant - mostly from Pavelka seed, I think.
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