Weeds are an increasing threat to the biodiversity of mountain regions worldwide including in Australia. We examined the distribution and characteristics of common weeds on roadsides in the Snowy Mountains, Australia to determine the range of natural habitats they are found in or if they are limited to disturbed sites, if they are also common in other mountain regions including the Australian Alps, and if they have invasive traits. There are only eight common weeds in the Snowy Mountains: Acetosella vulgaris (also known as Rumex acetosella), Hypochaeris radicata, Trifolium repens, Taraxacum officinale, Agrostis capillaris, Dactylis glomerata, Anthoxanthum odoratum, and Achillea millefolium. They occur in areas disturbed by humans, such as along roadsides, around building and tracks found, from the low altitude montane zone to the high altitude high subalpine/alpine zone. They also occur to varying extents in native vegetation reflecting their invasive capacity. These species are all perennial with high vegetative and/or sexual reproduction, native to Europe, and are found growing on roadsides and in native vegetation in mountains in Europe, North America, South America and New Zealand. Therefore, it appears that these plants are the usual suspects: common mountain weeds, which may be found worldwide at high altitude.
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