8 onion weed asphodelus fistulosus onion weed

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8. Onion weed ( Asphodelus fistulosus ) Onion weed infestations have been reported from roadsides across the Island and are also known from rough pasture in the Yellow Rock area. Onion weed occurs typically in disturbed areas or overgrazed pastures but does not dominate in well maintained pastures. Onion weed has the potential to invade much of the dry coastal vegetation on the Island (DPI 2008d). 9. African thistle ( Berkheya rigida ) A small infestation has been reported from the refuse disposal site and Camp Creek Reserve, both in Currie. African thistle is a stiff, spiny, perennial herb, preferring lighter, sandy soils and can invade agricultural areas (DPIW 2008a). 10. Slender thistle ( Carduus sp.) A single infestation of slender thistle is known from Pearshape quarry. Slender thistle is a strong competitor found in pasture, waste areas and arable crops (Hyde-Wyatt & Morris 1975). 11. Pampas grass ( Cortaderia sp . ) Pampas grass populations are associated with mine sites in Grassy and Naracoopa. It is also used as a hedging plant in parts of the northern half of the Island. A population of closely-related Cortaderia richardii (toe-toe) is known from around the scheelite mine at Grassy. Pampas grasses are aggressive colonizers of disturbed or open sites. They form dense stands that exclude most other ground-flora, seriously impeding overstorey recruitment. Individual flower heads can contain up to 100 000 seeds, that can be dispersed several kilometres away by strong winds (Muyt 2001). 12. English broom ( Cytisus scoparius ) A small infestation is known from Pegarah Road. English broom is a highly invasive species with the capabilities to totally transform the invaded habitat. It simplifies the structure and diversity of existing floral assemblages. Seeds are explosively dispersed; reaching up to 4.5 m from the parent plant and can remain dormant in the soil for up to twenty years (Muyt 2001). 13. Datura ( Datura sp.) There is a historical record of Datura sp. from an old house near Pass River, but recent surveys failed to find the infestation. Daturas are herbs that produce trumpet-shaped flowers. They can cause severe or fatal poisoning in humans and stock and have the potential to become significant crop weeds (DPIW 2008c). 14. Prickly jacks ( Emex australis ) Historically it was known from Charles Street, Currie, but recent surveys have failed to find the infestation. Recent reports indicate its presence on at least a couple of farms. Prickly jacks is a fast growing erect, spreading annual herb. It is a common pasture weed and infestations can be very dense. The spines on the fruits have the potential to harm animals and humans (University of Qld 2008). 15. Spanish heath ( Erica lusitanica ) King Island Biodiversity Management Plan 108
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A localised but intensive infestation is located in the Grassy township, around several residences and in adjacent bushland. Spanish heath is capable of completely dominating the shrub canopy, preventing virtually all regeneration.
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