[Members of the Sunflower Family with Discoid Flower Heads Found West of the Cascade Mountains]

Thistles West of the Cascade Mountains of Oregon and Washington

The Genus Carduus

Italian Thistle, Compact-headed Thistle: Carduus pycnocephalus

Italian Thistle: Carduus pycnocephalus

Musk Thistle, Nodding Plumeless Thistle: Carduus nutans -

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

Slender-flowered Thistle, Winged Plumeless Thistle: Carduus tenuiflorus (Synonyms: Carduus pycnocpehalus, Carduus pycnocepalus var. tenuiflorus) -

Paul Slichter E-mail