Also according to the aforementioned book the flowers - "Clusters of flower heads, silver in bud, yellowish when expanded, appear in summer."
I should have to say that, from the picture in the book it would not be something I would be over enthusiastic about. Having said that, photographs can be very misleading, insofar as what you see is not necessarily what you get. Or, not every plant is photogenic. sort of thing!!
valmarg