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CommentsField Hawkweed is one of several native and non-native hawkweeds (Hieracium spp.) that can be found in Illinois. Like other non-native hawkweeds, this species has primarily basal leaves and very few, if any, cauline leaves. Field Hawkweed can be distinguished from other non-native hawkweeds by its dense cluster of flowerheads and the presence of hair on both sides of its basal leaves. Other non-native hawkweeds have flowerheads that are more widely spread out, or their basal leaves have hairs along the lower side only, or the branches of their inflorescences lack glandular black hairs. One non-native species that is found in Illinois, Hieracium aurantiacum (Orange Hawkweed), can be readily distinguished by its orange flowerheads. Another scientific name of Field Hawkweed is Hieracium pratense. This species is sometimes referred to as 'King Devil' or 'Yellow King Devil.' These are old farmer names that refer to its unwelcome persistence in pastures and agricultural fields.