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I find these rosettes quite difficult to tell apart form a photo, as Spear Thistle can look very similar to Woolly, at this stage.
In a few weeks, it will all become clear...
My Flickr photos...
on grounds of relative frequency. As Ophrys says, I do not think you can tell them apart until the stem develops; but correct me if I am wrong.
Lat/Lng: 52.0577, -1.1165
OS grid ref: SP606402