Hieracium piloselloides Villars

Remark The words or terms in red (actually dark orange) in the text are defined in a glossary.

jun_19_09.gthmb can't be loaded. Hieracium piloselloides is an introduced naturalized and ecologically invasive perennial plant in North America. The species is native to Europe; it is apomictic.

The plant belongs to the Asteraceae family.


The genus name is said to come form the Greek ιεραξ, the falcon, since the Roman naturalist Gaius Plinius Secundas (Pliny the Elder, AD 23 - August 24, AD 79) believed that the feathery Accipiters (a group of birds of prey in the family Accipitridae, the hawks family notably) fed on plants of this genus to strengthen their eyesight and thus, Hieracium, as named by Pliny the Elder in his Naturalis Historia (34, 114) became the genus name, and by extension the Greek and Latin name of many species of the Hieracium genus, many of these species with the Hawkweed vernacular name.

In Latin pilosus means hairy; in Greek ειδοσ (eidos) means external appearance, so that piloselloides means hairy-like and the epithet refers to the pubescence of the plants of the species.

Common names

Some of the vernacular names of Hieracium piloselloides are: Tall Hawkweed, King Devil, Glaucous King Devil, King Devil Hawkweed and Smooth Hawkweed. The French vernacular manes are Épervière fausse piloselle and Épervière des Florentins.


Hieracium piloselloides has also been known as:


Hieracium piloselloides is easy to identify by its flowers that look a bit like those of Taraxacum (Dandelion), its usually pubescent basal leaves and stems, the later usually without leaves or with 2 to 4 quite small ones. draw.jpg can't be loaded.




Flower heads



Hieracium piloselloides is found on roadsides, in pastures, and waste land.


The map shows the Canadian provinces and the USA states where the plant can be found. It is abundant in Ontario, in western Québec, in western New York, and in Pennsylvania; it is rare elsewhere. map_na.jpg can't be loaded.


The photos of the gallery were taken either with one of the following: Minolta DiMAGE 7, Canon PowerShot A530, Canon Xt Rebel, usually with the EF-S60mm f/2.8 Macro USM objective, Fujifilm A 610 and EPSON Perfection 1650 (scanner). The title in the window shows the date when the picture was taken, i.e. jan_30_06... would mean that the photo was taken on the 30th of January, the 06 is for the 6th picture taken that day. The month, day and picture number might be followed by a letter which I use to identify the system used to take the picture.

Click on the thumbnails to get larger view. The original photos are usually in TIFF format, the photos shown are generally in JPEG format, often of dimensions one half (surface one quarter) for loading time reduction.


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Flower heads

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