en.wikipedia.org
en.wikipedia.org
rhs.org.uk
en.wikipedia.org
powo.science.kew.org
Plants of the World Online
https://powo.science.kew.org › taxon › urn:lsid:ipni.org:names:144432-1
inaturalist.org
species.wikimedia.org
species.wikimedia.org
https://species.wikimedia.org › wiki › Phyteuma_nigrum
garden.org
The National Gardening Association
https://garden.org › plants › view › 424658 › Black-Rampion-Phyteuma-nigrum
cabidigitallibrary.org
CABI Digital Library
https://www.cabidigitallibrary.org › doi › 10.1079 › cabicompendium.116328
gbif.org
commons.wikimedia.org
commons.wikimedia.org
https://commons.wikimedia.org › wiki › Phyteuma_nigrum
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