blessed thistle carduus crispus carduus nutans carline thistle cirsium discolor cirsium helenioides cirsium heterophylum cnicus benedictus cotton thistle fade faded field thistle golden thistle melancholy thistle musk thistle nodding thistle onopordon acanthium onopordum acanthium thistle weed alpine armour armoured Asteraceae Carlina acaulis carline dicotyledon Eberwurz edible europe flowering fortune Good humidity hunter's bread hurt indicator medicine needles perennial plant rosette silver thistle spine spiny star stemless sun thorn thorny traditional