[Thistles: The Genus Carduus West of the Cascade Mountains or Oregon and Washington]

Italian Thistle, Compact-headed Thistle

Carduus pycnocephalus

Synonyms: Carduus pycnocephalus ssp. pycnocephalus

Italian Thistle, Compact-headed Thistle: Carduus pycnocephalus (Synonyms: Carduus pycnocephalus ssp. pycnocephalus)

What may be italian thistle as seen on the weedy grass slopes of Beatty Creek RNA, several miles southwest of Riddle, OR.........June 10, 2017. If not this species, then it would be the similar Carduus tenuiflorus, which is also found in the area.

Paul Slichter