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Low growing spiny knapweed from Portugal

Observed: 4th June 2012 By: Nick UptonNick Upton’s reputation in PlantsNick Upton’s reputation in PlantsNick Upton’s reputation in PlantsNick Upton’s reputation in Plants
Purple knapweed (Centaurea pullata) flowering on sand dunes, Praia do Martinhal,  Sagres, Portugal, June.
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 find another likely sp, http://www.first-nature.com/flowers/centaurea_pullata.php http://www.flickr.com/photos/valter/4411599546/

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