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David J. Keil +
(Greene) J. T. Howell +
Carduus cymosus +
Peregrine thistle +
Calif. +, Nev. +  and Oreg. +
200–2000 m +
Grassy areas, sagebrush steppe, California woodlands, open coniferous or conifer-hardwood forests, roadsides +
Flowering spring–summer (Apr–Aug). +
Amer. Midl. Naturalist +
Cirsium botrys +  and Cirsium triacanthum +
Cirsium cymosum var. cymosum +
Cirsium cymosum +
variety +