I came across what I think is a shrubby Hypericum, which I don't
recognise. It's probably an escape from cultivation. The plant is about
25 cm, and the flowers about 3 cm across. The sepals are small, and the
stems 2-lined.
http://www.flickr.com/photos/27317581@N06/4033170694/
http://www.flickr.com/photos/27317581@N06/4032417587/
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Stewart Robert Hinsley