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Distribution and localisation map 

Orange Hawkweed

Pilosella aurantiaca

Épervière orangée

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With the orange color of its flower head it's the easiest of our Hawkweed to identify.
Can become invasive, is considered a real plague in some places.
Orange Hawkweed (Pilosella aurantiaca)
Orange Hawkweed : 1- Inflorescence
Orange Hawkweed : 2- Flowering plants
Orange Hawkweed : 3- Flower head
Orange Hawkweed : 4- Before fructification
Orange Hawkweed : 5- Colony
Photos of  Pilosella aurantiaca