Species Detail - Common Knapweed (Centaurea nigra) - Species information displayed is based on the dataset "The Flora of County Waterford".
Terrestrial Map - 10kmDistribution of the number of records recorded within each 10km grid square (ITM).
Marine Map - 50kmDistribution of the number of records recorded within each 50km grid square (WGS84).
Black Knapweed, Hardhead
1 January (recorded in 1970)
29 December (recorded in 2018)
Paul R Green, The Flora of County Waterford, National Biodiversity Data Centre, Ireland, Common Knapweed (Centaurea nigra), accessed 10 April 2020, <https://maps.biodiversityireland.ie/Dataset/23/Species/29714>