| Centaurea nigrescens | |
|---|---|
| Tyrol Thistle | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Cynareae |
| Genus: | Centaurea |
| Species: | C. nigrescens |
| Binomial name | |
| Centaurea nigrescens Willd. |
|
| Synonyms | |
|
Centaurea dubia Suter |
|
Tyrol Knapweed, Short-fringed Knapweed or Tyrol Thistle (Centaurea nigrescens) is a perennial plant of the star thistle genus that grows natively in Central and South-eastern Europe (from Southern Germany and Northern Italy to Romania and Bulgaria), but has also been introduced and is now a noxious weed in the Northern United States, Canada and Southern Australia. It has purple flowers and it flowers in the summer (June to September).