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 system | See 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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