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acanthium acanthoides asteraceae benedictus blessed bloom blossom carduus carline cirsium cnicus cotton crispus discolor dry environment field flora floret flower genus gluey golden head helenioides heterophylum insect invasive leaf leaves musk nectar nodding noxious nutans onopordon onopordum pale petal plant plume plumed pollen prickle prickly roadside spear species spine spiny stem thistle thorn weed welted wild wildflower woolly