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David J. Keil +
unknown +
Ala. +, Ark. +, Calif. +, Idaho +, Miss. +, N.Y. +, Oreg. +, Pa. +, S.C. +, Tex. +  and Europe (Mediterranean region). +
0–1000 m +
Aggressive weed of waste ground, rangelands, pastures, roadsides, fields +
Flowering spring–early summer (Mar–Jul). +
Sp. Pl. ed. +
Introduced +
Asteraceae tribe Cynarea +
Carduus pycnocephalus subsp. pycnocephalus +
Carduus pycnocephalus +
subspecies +