Poss Knapweed

Poss Knapweed

Observation - Poss Knapweed. Description: Flower heads about 18mm across. I would call the purple one 'Knapweed'. My book does not mention (that I can see) anything about the white one! They on same plant when I picked them. (Weather too bad for outdoor pic today)

Flower heads about 18mm across. I would call the purple one 'Knapweed'. My book does not mention (that I can see) anything about the white one! They on same plant when I picked them. (Weather too bad for outdoor pic today)