Very small one, its diameter just is about 10 mm.
I am merely guessing here a simage not clear w.r.t. growth habit and foliage - so other suggestions welcome. A Centaurium species perhaps? -Either C. erythraea or C. tenuiflorum - see http://www.nzpcn.org.nz/flora_details.aspx?ID=3602 and http://www.nzpcn.org.nz/flora_details.aspx?ID=3647.
Dear Peter, thanks a lot for your id, hereby attached one photo more, hope it will be helpful for the species confirm.
Well to me its in the Gentianaceae and I believe its a Centaurium - the leaves look a little narrow for the species I know but perhaps that's just your growing conditions. Maybe someone else reading this can advise?
Dear Peter, much thanks!
(JPG format, max 500kB)
Dear Peter, thanks a lot for your id, hereby attached one photo more, hope it will be helpful for the species confirm.