Hieracium piloselloides Villars
The words or terms in red
(actually dark orange) in the text are defined in a
Hieracium piloselloides is an
and ecologically invasive perennial plant
in North America. The species is
native to Europe;
it is apomictic.
The plant belongs to the
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.
Some of the vernacular names of
Hieracium piloselloides are:
Tall Hawkweed, King Devil, Glaucous King Devil, King Devil Hawkweed and
The French vernacular manes are Épervière fausse piloselle and
Épervière des Florentins.
Hieracium piloselloides has also been known as:
- Hieracium florentinum All.
- Pilosella piloselloides (Vill.) Soják
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.
- From 1 to 2 feet tall.
- Usually pubescent.
- Mainly basal with at times 2 to 4
- oblanceolate to
- With a cuneate base.
- On an inflorescence of
several, long-stalked heads in compact to open clusters.
- From 1/2 to 3/4 inch wide.
- Without disk florets.
- With yellow ray florets.
- Blooming from the middle of June to September in my area,
25 km north of Montréal.
- A small achene.
- With a white pappus.
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.
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.