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Invasiveness Assessment - King devil hawkweed (Hieracium piloselloides) in Victoria (Nox)

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Plant invasiveness is determined by evaluating a plant’s biological and ecological characteristics against criteria that encompass establishment requirements, growth rate and competitive ability, methods of reproduction, and dispersal mechanisms.

Each characteristic, or criterion, is assessed against a list of intensity ratings. Depending upon information found, a rating of Low, Medium Low, Medium High or High is assigned to that criterion. Where no data is available to answer a criterion, a rating of medium (M) is applied. A description of the invasiveness criteria and intensity ratings used in this process can be viewed here.

The following table provides information on the invasiveness of King devil hawkweed.

A more detailed description of the methodology of the Victorian Weed Risk Assessment (WRA) method can be viewed below:

Victorian Weed Risk Assessment (WRA) method (PDF - 630 KB)
Victorian Weed Risk Assessment (WRA) method (DOC - 1 MB)
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Common Name: King devil hawkweed
Scientific name: Hieracium piloselloides

Question
Comments
Reference
Rating
Establishment
Germination requirements?See H. aurantiacum.

Also see Johnson & Thomas (1978) CAB abstract.


Martin (1997) states this species, “…is now beginning to crop up in the shade of undisturbed forest , a completely new habitat.”
Martin (1997)
MH
Establishment requirements?See H. aurantiacum.

See also Johnson & Thomas (1978) CAB abstract, and Martin (1997)
MH
How much disturbance is required?See H. aurantiacum.

See also Martin (1997)
H
Growth/Competitive
Life form?Perennial herb. Geophyte. Creeping stolons, though stolons ususally absent.
AQIS (1996)
Callihan et al (1997)
L
Allelopathic properties?Minor proeties likely as allelopathy is notable among other plants of the genus.
Tutin et al (1976)
ML
Tolerates herb pressure?See H. aurantiacum.
MH
Normal growth rate?See H. aurantiacum.
H
Stress tolerance to frost, drought, w/logg, sal. etc?Tolerant to fire (rhizomes) and frost (occurs in Ontario, Canada & the south island of New Zealand).
Callihan et al (1977)
Johnson & Thomas (1978)
Webb et al (1988)
ML
Reproduction
Reproductive systemSee H. pilosella.
H
Number of propagules produced?See H. aurantiacum.
ML
Propagule longevity?See H. aurantiacum.
L
Reproductive period?See H. pilosella.
H
Time to reproductive maturity?See H. aurantiacum.
MH
Dispersal
Number of mechanisms?See H. pilosella.
H
How far do they disperse?See H. aurantiacum.
MH


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