Centaurea solstitialis St. Barnaby's Thistle
This particular Knapweed also known as Yellow Star Thistle, Yellow Cockspur and Golden Starthistle stood nearly 2m tall with spiny flowerheads. The spines on the flowers can be even longer than in the photograph. The winged stems are also a characteristic. It seems to be quite variable with much smaller plants growing on poorer, drier ground.
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Grounds of Alora Castle, Andalucia, Spain 29th March 2008
Added on 5th April 2008, updated 26th November 2008, updated 11th March 2010, updated 16th March 2013