[Ag-eq] Not Jerusalem artichokes after all!

[Jewel]

They are Globe artichokes, a much less invasive species, which explains why they have not taken 
over, but neither do they produce the edible tuber as does the Jerusalem, which I am, reliably, 
informed is not a thistle as is the globe artichoke but are of the aster/daisy genus.
I haven't examined these enormous flowers, in detail, for several days but I see that the open 
flowers have developed a perfectly circular patch of bristles, rather like a human head would do a 
fortnight after a very thorough short back and sides haircut.  Is a circular patch of this sort what 
is called a monk's tonsure?

        Jewel