• WordNet 3.6
    • n Hieracium large genus of perennial hairy herbs of Europe to western Asia to northwestern Africa and North America; few are ornamental; often considered congeneric with Pilosella
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Century Dictionary and Cyclopedia
    • n hieracium A large genus of plants, belonging to the order Compositœ and tribe Cichoriaceœ, and type of the subtribe Hieraceœ. They are perennial or rarely annual herbs, with the receptacle naked or short-fimbrillate, and a fuscous pappus of rigid, fragile bristles; corollas all ligulate, 5-dentate, yellow or rarely white or red; achenia oblong or columnar, smooth and glabrous, mostly 10-ribbed or striate; leaves often toothed, but never lobed. Nearly 300 species have been described, widely distributed throughout the temperate regions of both hemispheres. About 25 species are North American. Hawkweed is the name generally given to them. H. venosum, a native of the eastern United States, is called rattlesnake-weed. H. aurantiacum, a common European species, is known in England as grim-the-collier, on account of the black hairs which clothe the flower-stalk and involucre. H. prœaltum, also a European species, has become naturalized in restricted localities in northern New York, where it is known as the king-devil. H. pilosella of Europe is there called mouse-ear.
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In literature:

Hieracium alpinum (on grassy plains).
"Visit to Iceland and the Scandinavian North" by Ida Pfeiffer
Hieracium, few species, but pretty well marked.
"More Letters of Charles Darwin" by Charles Darwin
Rubus and Hieracium, comparison of variability of N. American and European species.
"More Letters of Charles Darwin Volume II" by Charles Darwin
Hieracium appears at about the same height.
"Journals of Travels in Assam, Burma, Bhootan, Afghanistan and TheNeighbouring Countries" by William Griffith