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A. A. Reznicek

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An introduction from Europe. Old fields, roads, railroads, and other disturbed sites; lawns and edges of forests. First collected in Michigan in 1969 (Sanilac Co.) and 1971 (Ingham Co.).

Averaging only slightly taller than H. pilosella and also strongly stoloniferous. Few-headed plants of H. caespitosum might be thought to belong here, but that species has shorter involucres and the leaves are both more acute at the apex and more tapered at the base than in H. flagellare. Intermediate plants with ± numerous stellate hairs on the leaves beneath may represent hybrids between these two species.

This species itself is suspected to be of hybrid origin, between Hieracium caespitosum and H. pilosella. It appears to be significantly more frequent in Michigan than H. pilosella.

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