Rhaponticum repens
![Acroptilon repens_Russian knapweed_JM DiTomaso](https://www.cal-ipc.org/wp-content/uploads/2017/10/Acroptilon-repens_Russian-knapweed_JM-DiTomaso-300x225.jpg)
- Common name(s): Russian knapweed, hardheads, creeping knapweed, mountain bluet, Turkestan thistle
- Synonym(s): Acroptilon repens, Centaurea repens
- All names: Acroptilon repens, Centaurea repens, Russian knapweed, hardheads, creeping knapweed, mountain bluet, Turkestan thistle