Russian Knapweed, Hardheads

Acroptilon repens (L.) DC. (formerly Centaurea repens)

Asteraceae (Sunflower Family)

▲ ▼ young shoots emerging from creeping roots

▲  extensive creeping root system producing new off-shoots

▲ ▼ dense colony of Russian Knapweed in Colorado

▲ flowering stem

▲  flower showing papery bracts on leaves

·         Russian knapweed (pp. 100-101, Weeds of the Great Plains)

o        Creeping perennial with creeping roots that can form dense colonies

o        Flowers pinkish-purple, similar to spotted knapweed

o        Leaves not deeply divided—just somewhat lobed or toothed

o        Bracts under inflorescence are papery

o        Also found in western plains & west of Rocky Mountains