mystery shiny leaved shrub

I have been growing this shrub for over 30 years in my unheated greenhouse. I thought it was Vinca rosea, seed of which I had bought from Park's. It has shiny evergreen leaves and has never flowered. Today I decided I had waited long enough and began to cut it down. To my surprise, I found it was flowering. Perhaps it has done so every year and I never noticed the green flowers. 

Can anyone identify it?

I have put a picture on my Picasa account:

              http://picasaweb.google.com/ldiane.whitehead/MysteryEvergreen#


Diane Whitehead
Victoria, British Columbia, Canada
maritime zone 8, cool Mediterranean climate
mild rainy winters, mild dry summers
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