The southern African Senecio inaequidens – S. madagascariensis complex, (‘fireweed complex’), contains several species that have established as weeds outside of their native ranges. Senecio madagascariensis is the most widespread, found in Mexico, South America, Japan, Australia, New Zealand, and the Hawaiian Islands. Species delimitation in the complex is controversial, and identification of specimens is difficult. Biological...

Background and aims Tree dieback is increasing worldwide, threatening the biodiversity and functioning of many terrestrial ecosystems. Tree dieback is associated with multiple interconnected changes in community composition and ecosystem processes. These changes affect plant, fauna and soil microbial communities, and soil physical and chemical processes. However, these ecosystem changes associated with tree dieback have receiv...

The identity and diversity of Kordyana species on three native species of Commelinaceae in Australia were studied following surveys in 2020–2022 for Kordyana brasiliensis , which had been deliberately released as a biocontrol agent for the environmental weed Tradescantia fluminensis . Three new species of Kordyana are described from Australia based on DNA sequence analysis of the ITS and LSU rDNA regions, morphology, host asso...

Examining context-dependency of ecological impacts of alien plant invasions is critical to further understand the mechanisms driving impacts. We examined how different regional and local habitat contexts influence the abundance-impact associations of an invasive ground-creeper, Tradescantia fluminensis , in native forests across eastern New South Wales (NSW), Australia. Invader impacts were assessed using surveys of resident v...