Plants 100–150 cm. Stems simple or distally ± branched, ± white-tomentose, proximally sometimes ± glabrate. Leaves: basal and proximal cauline winged-petiolate, mid cauline ± clasping; blades elliptic to obovate, margins 2-pinnately divided nearly to midvein, lobes linear to oblong, spiny-serrate, spine-tipped, abaxial faces white-tomentose, adaxial faces green, sparsely viscid-glandular; distal smaller, less divided. Secondary heads 3.5–4.5 cm diam. Involucres 15–20 mm. Inner phyllaries lavender, apices attenuate, serrulate, scabrous, not glandular. Corollas blue to purple (white). Cypselae ca. 6 mm; pappi of ± connate, minutely barbed scales ca. 1 mm. 2n = 32 (Greece).

Phenology: Flowering summer (Jun–Aug).
Habitat: Disturbed sites
Elevation: 0–500 m

Distribution

• Generated Map
• Legacy Map

Introduced; N.Y., Wash., Europe, Asia.

Discussion

Subspecies ruthenicus sometimes escapes from cultivation.

Selected References

None.

Lower Taxa

None.