Species Detail - Common Knapweed (Centaurea nigra) - Species information displayed is based on the dataset "BSBI tetrad data for Ireland".

Terrestrial Map - 10km

Distribution of the number of records recorded within each 10km grid square (ITM).
Live Map

Marine Map - 50km

Distribution of the number of records recorded within each 50km grid square (WGS84).
Live Map
Centaurea nigra
Common Knapweed
Black Knapweed, Hardhead
N/A
cenig
L.
flowering plant
Species
1313
347
112
01/01/1930
31/12/2010
1 January (recorded in 1970)
29 December (recorded in 2018)
Botanical Society of the British Isles, BSBI tetrad data for Ireland, National Biodiversity Data Centre, Ireland, Common Knapweed (Centaurea nigra), accessed 30 September 2020, <https://maps.biodiversityireland.ie/Dataset/9/Species/29714>

Records per month (across all datasets)

Records per year (across all datasets)