| Taxon | Centaurea jacea subsp. nigra |
| group | Eudicots |
| Family | Asteraceae |
| Family common name(s) | composite; composita; comp; aster; asterwort; asterworts; sunflower; daisy; dandelion |
| Genus common name(s) | centaurea; knapweed; knap-weed; knap weed; knopweed; knop-weed; knop weed; star-thistle; star thistle; starthistle; cornflower; corn-flower; corn flower; barbeau |
| Species common name(s) | brown-rayed knapweed; brown rayed knapweed; brown-ray knapweed; brown ray knapweed; brownray knapweed; brown-scale knapweed; brownscale knapweed; brown centaury; rayed knapweed; horse-knobs |
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| Common name(s) generally applied to other taxa or multiple taxa | common knapweed is applied to multiple Centaurea taxa; hardheads, hard-heads, hard heads, bundweed are applied to multiple Asteraceae taxa; centaury, broad weed, French tobacco, dusty miller, dusty-miller are applied to taxa in multiple families |
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| Notes | Spanish is a proper name, so upper case preferable |
| Synonymy: The Jepson Manual (1993), FNA, PLANTS, etc | Centaurea nigra L. |
