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That's all I have, but will try to go back soon if possible. There were a lot of the plants. I did ponder over whether it was annual or perennial, but the leaves seemed to resemble the pictures in my book.
I have added another photo showing the leaves more clearly
that helps, = tenuifolia!
Glad to have a definite decision - thank you.
Lat/Lng: 54.6132, -1.087
OS grid ref: NZ590246