Hieracium (Pilosella), (Hill) S. F. Gray. Rhizome

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 366

Subgen. Pilosella (Hill) S. F. Gray. Rhizome horizontal or oblique, with a persistent rosette of leaves, from the axils of which are usually developed procumbent leafy, or underground scaly stolons, sometimes bearing capitula at their apices. Flowering stems 1 to numerous. Leaves entire or slightly denticulate, never distinctly petiolate, often all basal, the cauline, when present, usually small or bract-like. Ligules yellow (often with a red stripe on outer face) or reddish, glabrous. Pollen copious. Achenes up to 2-5 mm, each rib shortly projecting above to form a crenulate apex; pappus-hairs in 1 row with a few shorter than the rest. Receptacular pits shortly dentate.