Pilosella officinarum (mouse-ear hawkweed).

Abstract P. officinarum is a prostrate herb which has spread rapidly to exotic locations (e.g. New Zealand, North America and South America) after introduction as a garden ornamental or contaminant of agricultural seed. As it continues to be available as an ornamental and can be easily transported by machinery, P. officinarum is likely to spread further. It is an undesirable invader on account of its vigorous growth due to stolon production and wind-dispersed seeds. P. officinarum displaces the inter-tussock vegetation leading to loss of forage and biodiversity.