Low growing spiny knapweed from Portugal

Low growing spiny knapweed from Portugal

Observation - Low growing spiny knapweed from Portugal. Description: These low growing (6 inches max) knapweed with very spiny, cactus like bracts were growing among sand dunes near Sagres in the Algarve Matches Purple knapweed well by descriptions and spines, though other photos show a more maculated pattern, but I can't

These low growing (6 inches max) knapweed with very spiny, cactus like bracts were growing among sand dunes near Sagres in the Algarve Matches Purple knapweed well by descriptions and spines, though other photos show a more maculated pattern, but I can't find another likely sp, http://www.first-nature.com/flowers/centaurea_pullata.php http://www.flickr.com/photos/valter/4411599546/